CN102843325A - Method and system for processing reference signal of an open loop MIMO (multiple-input multiple-output) system - Google Patents

Abstract

The invention discloses a method and a system for processing a reference signal of an open loop MIMO (multiple-input multiple-output) system. The method comprises the following steps: utilizing a CDM (code division multiplexing) technology and/or a TDM (time division multiplexing) technology and/or FDM (frequency division multiplexing) technology in a special sub-frame, multiplexing different groups of open loop DMRSs (dynamic memory management system) on one symbol or more than one orthogonal frequency division multiplexing symbols in the second, third, fifth, sixth, ninth and tenth OFDM symbols; and utilizing the same or different weights as to different groups of open loop DMRSs, and carrying out corresponding weighted approach. According to the method and system for processing the reference signal of the open loop MIMO system, the pilot frequency design of the open loop is carried out on the basis of the DMRS; the pre-coded weight or weight formed by a wave beam at the network side cannot be limited by a codebook; the precision of the pre-coded or wave-beam formed weight is greatly improved, and the performance of UE (user equipment) under an open-loop environment can be improved possibly on the basis of not increasing the realization complexity, the test complexity and resource consumption of the UE.

Description

Reference signal processing method and system for open-loop MIMO system

Technical Field

The invention relates to the field of communication, in particular to a reference signal processing method and a reference signal processing system for an open-loop multiple-input multiple-output (MIMO) system.

Background

In Long term evolution LTE (LTE) version (Release, R)8/9, in order to measure the quality of a channel and demodulate received data symbols, a Common Reference Signal (CRS) is designed, and a UE (User Equipment) may measure the channel through the CRS, thereby determining that the UE performs cell reselection and handover to a target cell, and perform channel quality measurement in a UE connection state, and when an interference level is high, a physical layer may disconnect through a radio link connection failure signaling related to a higher layer. In LTE R10, to further improve the cell average spectrum utilization and the cell edge spectrum utilization as well as the throughput of each UE, two kinds of reference signals are defined: CSI-RS (channel information reference signal) and DMRS (demodulation reference signal); the CSI-RS is used for measuring a channel, and a PMI (Precoding Matrix index), a CQI (channel quality Indicator), and an RI (Rank Indicator) that the UE needs to feed back to the base station may be calculated by measuring the CSI-RS. The DMRS can be used for enabling the UE to transparently receive downlink data without knowing a precoding weight value applicable to the base station side, so that the load of the PDCCH can be reduced, and the limit of a codebook on the weight value can be reduced.

In R8, TM (transmission mode) 1 to TM6 are transmitted using CRS, demodulation is performed using CRS in an open-loop mode such as TM3, and DMRS-based transmission optimization is performed only for TM1, TM2, and TM4 to TM6 and DMRS-based optimization is not performed for an open-loop mode such as TM3 in stages R9 to R10. In future releases, in consideration of many factors such as energy saving and resource saving, CRS needs to fade out gradually, so that DMRS is needed to be designed for an open-loop transmission mode such as TM3, but there is no corresponding technical support at present, that is, transmission of open-loop MIMO cannot be achieved through DMRS, resulting in higher additional resource overhead brought by common reference signal pilot.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a method and a system for processing reference signals of an open-loop MIMO system, which implement transmission of open-loop MIMO through DMRS, thereby reducing the overhead of additional resources caused by common reference signal pilots.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for reference signal processing for an open-loop MIMO system, the method comprising:

multiplexing different sets of open-loop DMRSs on one or more OFDM symbols of 2 nd, 3 rd, 5 th, 6 th, 9 th, 10 th OFDM symbols using CDM and/or TDM and/or FDM techniques in a special subframe; and performing corresponding weighting processing by using the same or different weights aiming at different groups of open-loop DMRSs.

The OFDM symbol carrying the open-loop DMRS is the {2, 3, 9, 10} th OFDM symbol.

The open-loop DMRS are borne on 0 th to 11 th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, wherein the 0 th to 11 th subcarriers bear the same or different DMRS groups respectively, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, where the {0, 4} th subcarrier carries DMRS group 0, the {1, 5} th subcarrier carries DMRS group 1, the {6, 10} th subcarrier carries DMRS group 2, and the {7, 11} th subcarrier carries DMRS group 3, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups.

Multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {9, 10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group contains more than two DMRS ports, the Walsh code is used for multiplexing more than two ports on four pilot resource elements of the same subcarrier on {2, 3} and {9, 10} OFDM symbols, the Walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, -1, 1], or each 2k DMRS group and 2k +1DMRS group is a precoding group, different DMRS groups in the same precoding group are precoded by using different layers of weights of the same precoding, wherein k is a non-negative integer.

The open-loop DMRS is carried on {1, 5, 7, 11} sub-carriers of {2, 3} th and {9, 10} th OFDM symbols, wherein the {1, 5} sub-carriers carry DMRS group 0, the {7, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 5, 6, 11} sub-carriers of {2, 3} th and {9, 10} th OFDM symbols, wherein the {0, 5} sub-carrier carries DMRS group 0, the {6, 11} sub-carrier carries DMRS group 1, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {9, 10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group includes more than two DMRS ports, the walsh code is used to multiplex more than two ports on four pilot resource elements of the same sub-carrier located on {2, 3} and {9, 10} OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1], and/or the pilot resources on different pilot sub-carriers in the same DMRS group use different layers of weights of the same precoding, and the pilot resources on the same pilot sub-carriers use the same layers of weights of the same precoding.

The open-loop DMRS is carried on {0, 4, 6, 10} th subcarriers of {2, 3} th and {1, 5, 7, 11} th subcarriers of {9, 10} OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, and when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {9, 10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when more than two DMRS ports are included in each DMRS group, then walsh codes are used to multiplex more than two ports on four pilot resource elements on the 0 th subcarrier on the 2, 3 OFDM symbols and the 1 st subcarrier on the 9, 10 OFDM symbols, multiplex more than two ports on the 4 th subcarrier on the 2, 3 OFDM symbols and more than two ports on four pilot resource elements on the 5 th subcarrier on the 9, 10 OFDM symbols, multiplex more than two ports on the 6 th subcarrier on the 2, 3 OFDM symbols and more than four pilot resource elements on the 7 th subcarrier on the 9, 10 OFDM symbols, and multiplex more than two ports on the 10 th subcarrier on the 2, 3 OFDM symbols and more than four pilot resource elements on the 11 th subcarrier on the 9, 10 OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ]; and/or the {0} sub-carrier on {2, 3} OFDM symbols and the {1} sub-carrier on {9, 10} OFDM symbols are a precoding layer group 0, the {4} sub-carrier on {2, 3} OFDM symbols and the {5} sub-carrier on {9, 10} OFDM symbols are a precoding layer group 1, the {6} sub-carrier on {2, 3} OFDM symbols and the {7} sub-carrier on {9, 10} OFDM symbols are a precoding layer group 2, the {10} sub-carrier on {2, 3} OFDM symbols and the {11} sub-carrier on {9, 10} OFDM symbols are precoding layer group 3; and weights of different layers with the same precoding weight are used for precoding among different layer groups in the same DMRS group, and weights of the same layer with the same precoding weight are used for precoding in different layer groups in the same DMRS group.

The OFDM symbols carrying the open-loop DMRS are {2, 3} th and {5, 6} th OFDM symbols.

The open-loop DMRS are borne on 0 th to 11 th subcarriers of {2, 3} th and {5, 6} th OFDM symbols, wherein the 0 th to 11 th subcarriers bear the same or different DMRS groups respectively, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} sub-carriers of {2, 3} th and {5, 6} OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} sub-carriers, DMRS group 1 is carried on the {6, 7, 10, 11} sub-carriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {5, 6} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group contains more than two DMRS ports, the Walsh code is used for multiplexing more than two ports on four pilot resource elements of the same subcarrier on {2, 3} and {5, 6} OFDM symbols, the Walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, -1, 1], or each 2k DMRS group and 2k +1DMRS group is a precoding group, different DMRS groups in the same precoding group are precoded by using different layers of weights of the same precoding, wherein k is a non-negative integer.

The open-loop DMRS is carried on {1, 5, 7, 11} sub-carriers of {2, 3} th and {5, 6} th OFDM symbols, wherein the {1, 5} sub-carriers carry DMRS group 0, the {7, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 5, 6, 11} sub-carriers of {2, 3} th and {5, 6} th OFDM symbols, wherein the {0, 5} sub-carrier carries DMRS group 0, the {6, 11} sub-carrier carries DMRS group 1, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {5, 6} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group includes more than two DMRS ports, the walsh code is used to multiplex more than two ports on four pilot resource elements of the same sub-carrier located on {2, 3} and {5, 6} OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1], and/or the pilot resources on different pilot sub-carriers in the same DMRS group use different layers of weights of the same precoding, and the pilot resources on the same pilot sub-carriers use the same layers of weights of the same precoding.

The open-loop DMRS is carried on {0, 4, 6, 10} th subcarriers of {2, 3} th OFDM symbols and {1, 5, 7, 11} th subcarriers of {5, 6} th OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, and when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {5, 6} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when more than two DMRS ports are included in each DMRS group, then walsh codes are used to multiplex more than two ports on four pilot resource elements on the 0 th subcarrier on the 2, 3 OFDM symbols and the 1 st subcarrier on the 5, 6 OFDM symbols, multiplex more than two ports on four pilot resource elements on the 4 th subcarrier on the 2, 3 OFDM symbols and the 5 th subcarrier on the 5, 6 OFDM symbols, multiplex more than two ports on four pilot resource elements on the 6 th subcarrier on the 2, 3 OFDM symbols and the 7 th subcarrier on the 5, 6 OFDM symbols, and multiplex more than two ports on four pilot resource elements on the 10 th subcarrier on the 2, 3 OFDM symbols and the 11 th subcarrier on the 5, 6 OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ]; and/or the {0} sub-carrier on {2, 3} OFDM symbols and the {1} sub-carrier on {5, 6} OFDM symbols are a precoding layer group 0, the {4} sub-carrier on {2, 3} OFDM symbols and the {5} sub-carrier on {5, 6} OFDM symbols are a precoding layer group 1, the {6} sub-carrier on {2, 3} OFDM symbols and the {7} sub-carrier on {5, 6} OFDM symbols are a precoding layer group 2, the {10} sub-carrier on {2, 3} OFDM symbols and the {11} sub-carrier on {5, 6} OFDM symbols are precoding layer group 3; and weights of different layers with the same precoding weight are used for precoding among different layer groups in the same DMRS group, and weights of the same layer with the same precoding weight are used for precoding in different layer groups in the same DMRS group.

The open-loop DMRS is carried on the 2, 6 th OFDM symbol.

The open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 6} th OFDM symbol of OFDM, wherein the {0, 1, 4, 5} th subcarriers carry DMRS group 0, the {6, 7, 10, 11} th subcarriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is borne on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 6} th OFDM symbol of OFDM, wherein the {0, 1} th subcarriers bear DMRS group 0, the {4, 5} th subcarriers bear DMRS group 1, the {6, 7} th subcarriers bear DMRS group 2, the {10, 11} th subcarriers bear DMRS group 3, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 6} th OFDM symbols, wherein the {0, 1, 3, 4} sub-carriers carry DMRS group 0, the {7, 8, 10, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is borne on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 6} th OFDM symbols, wherein the {0, 1} sub-carriers bear DMRS group 0, the {3, 4} sub-carriers bear DMRS group 1, the {7, 8} sub-carriers bear DMRS group 2, the {10, 11} sub-carriers bear DMRS group 3, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2} th OFDM symbol and the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {6} th OFDM symbol, wherein the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weight is used in the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} sub-carriers of the {2} th OFDM symbol and on the {1, 2, 4, 5, 7, 8, 10, 11} sub-carriers of the {6} th OFDM symbol, wherein the DMRS group 0 is carried on the {0, 1} sub-carriers on the {2} th OFDM symbol and on the {1, 2} sub-carriers on the {6} th OFDM symbol, the 3, 4} sub-carriers on the {2} th OFDM symbol and on the {4, 5} sub-carriers on the {4, 5} OFDM symbol carry the DMRS group 1 on the {6, 7} sub-carriers on the {2} th OFDM symbol and on the {7, 8} sub-carriers on the {6} th OFDM symbol, the 9, 10} sub-carriers on the {2} th OFDM symbol and the {10, 11} sub-carriers on the {6} OFDM symbol, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups.

For each DMRS group, multiplexing different DMRS ports by adopting an FDM (frequency division multiplexing) and/or frequency-domain CDM (code division multiplexing), when each DMRS group comprises two DMRS ports, multiplexing two ports on two pilot resource elements of adjacent subcarriers positioned on {2} and/or {6} OFDM (orthogonal frequency division multiplexing) symbols by adopting a walsh code, wherein the walsh code adopts [1, 1], [1, -1 ]; when each DMRS group comprises more than two DMRS ports, the walsh codes are adopted to multiplex four adjacent pilot resource elements of {2} and/or {6} OFDM symbols on the same DMRS group on the same OFDM symbol, wherein the number of the pilot resource elements is more than two; walsh codes employ [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

The open-loop DMRS is carried on the {2, 5, 6, 10} th OFDM symbol.

The open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbols of the OFDM, wherein the {0, 1, 4, 5} th subcarriers carry DMRS group 0, the {6, 7, 10, 11} th subcarriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbols of the OFDM, wherein the DMRS group 0 is carried on the {0, 1} th subcarriers, the DMRS group 1 is carried on the {4, 5} th subcarriers, the DMRS group 2 is carried on the {6, 7} th subcarriers, the DMRS group 3 is carried on the {10, 11} th subcarriers, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted in the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 10} th OFDM symbols, wherein the {0, 1, 3, 4} sub-carriers carry DMRS group 0, the {7, 8, 10, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 10} th OFDM symbols, wherein the DMRS group 0 is carried on the {0, 1} sub-carriers, the DMRS group 1 is carried on the {3, 4} sub-carriers, the DMRS group 2 is carried on the {7, 8} sub-carriers, the DMRS group 3 is carried on the {10, 11} sub-carriers, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted in the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2, 6} th OFDM symbol and the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {5, 10} th OFDM symbol, wherein the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups; or,

the open-loop DMRS is carried on the 0 th, 1, 3, 4, 6, 7, 9, 10 th sub-carrier of the 2 th OFDM symbol and on the 1 st, 2, 4, 5, 7, 8, 10, 11 th sub-carrier of the 5 th, 10 th OFDM symbol, wherein the 0 th, 1 th sub-carrier on the 2 th OFDM symbol and the 1 st, 2 th sub-carrier on the 5 th OFDM symbol carry DMRS group 0, the 3 rd, 4 th sub-carrier on the 2 th OFDM symbol and the 4 th, 5 th sub-carrier on the 5 th OFDM symbol carry DMRS group 1, the 6 th, 7 th sub-carrier on the 2 th OFDM symbol and the 7 th, 8 th sub-carrier on the 5 th OFDM symbol carry DMRS group 2, the 9 th, 10 th sub-carrier on the 2 th OFDM symbol and the 10 th sub-carrier on the 5 th OFDM symbol, DMRS group 3 is carried on 11} subcarriers, DMRS group 4 is carried on {0, 1} th subcarrier on {6} th OFDM symbol and {1, 2} th subcarrier on {10} th OFDM symbol, DMRS group 4 is carried on {3, 4} th subcarrier on {6} th OFDM symbol and {4, 5} th subcarrier on {4, 5} th OFDM symbol, DMRS group 5 is carried on {6, 7} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {7, 8} th subcarrier on {10} th OFDM symbol, DMRS group 6 is carried on {9, 10} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {10, 11} th subcarrier on {10} th OFDM symbol, the same precoding or beamforming weights are used within each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

Multiplexing different DMRS ports in an FDM and/or frequency-domain CDM manner in each DMRS group, and when two DMRS ports are contained in each DMRS group, multiplexing two ports on two pilot resource elements of adjacent subcarriers located on {2} and/or {5} and/or {6} and/or {10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group comprises more than two DMRS ports, the walsh codes are adopted to multiplex four adjacent pilot resource elements of the same DMRS group on the same OFDM symbol on {2} and/or {5} and/or {6} and/or {10} OFDM symbols, wherein the four adjacent pilot resource elements are more than two ports; walsh codes employ [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

The open-loop DMRS is carried on the {2, 5, 6, 9} th OFDM symbol.

The open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol of OFDM, wherein the {0, 1, 4, 5} th subcarriers carry DMRS group 0, the {6, 7, 10, 11} th subcarriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol of OFDM, wherein the DMRS group 0 is carried on the {0, 1} th subcarrier, the DMRS group 1 is carried on the {4, 5} th subcarrier, the DMRS group 2 is carried on the {6, 7} th subcarrier, the DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted in the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 9} th OFDM symbols, wherein the {0, 1, 3, 4} sub-carriers carry DMRS group 0, the {7, 8, 10, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 9} th OFDM symbols, wherein the DMRS group 0 is carried on the {0, 1} sub-carriers, the DMRS group 1 is carried on the {3, 4} sub-carriers, the DMRS group 2 is carried on the {7, 8} sub-carriers, the DMRS group 3 is carried on the {10, 11} sub-carriers, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted in the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2, 6} th OFDM symbol and the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {5, 9} th OFDM symbol, wherein the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups; or,

the open-loop DMRS is carried on the 0 th, 1, 3, 4, 6, 7, 9, 10 th sub-carrier of the 2 th OFDM symbol and on the 1 st, 2, 4, 5, 7, 8, 10, 11 th sub-carrier of the 5 th, 9 th OFDM symbol, wherein the 0 th, 1 th sub-carrier on the 2 th OFDM symbol and the 1 st, 2 th sub-carrier on the 5 th OFDM symbol carry DMRS group 0, the 3 rd, 4 th sub-carrier on the 2 th OFDM symbol and the 4 th, 5 th sub-carrier on the 5 th OFDM symbol carry DMRS group 1, the 6 th, 7 th sub-carrier on the 2 th OFDM symbol and the 7 th, 8 th sub-carrier on the 5 th OFDM symbol carry DMRS group 2, the 9 th, 10 th sub-carrier on the 2 th OFDM symbol and the 10 th sub-carrier on the 5 th OFDM symbol, DMRS group 3 is carried on 11} subcarriers, DMRS group 4 is carried on {0, 1} th subcarrier on {6} th OFDM symbol and {1, 2} th subcarrier on {9} th OFDM symbol, DMRS group 4 is carried on {3, 4} th subcarrier on {6} th OFDM symbol and {4, 5} th subcarrier on {4, 5} th OFDM symbol, DMRS group 5 is carried on {6, 7} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {7, 8} th subcarrier on {9} th OFDM symbol, DMRS group 6 is carried on {9, 10} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {10, 11} th subcarrier on {9} th OFDM symbol, the same precoding or beamforming weights are used within each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

Multiplexing different DMRS ports in an FDM and/or frequency-domain CDM manner in each DMRS group, and when two DMRS ports are contained in each DMRS group, multiplexing two ports on two pilot resource elements of adjacent subcarriers located on {2} and/or {5} and/or {6} and/or {9} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group comprises more than two DMRS ports, the walsh codes are adopted to multiplex four adjacent pilot resource elements of the same DMRS group on the same OFDM symbol on {2} and/or {5} and/or {6} and/or {9} OFDM symbols, wherein the four adjacent pilot resource elements are more than two ports; walsh codes employ [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

A reference signal processing system of an open-loop multiple-input multiple-output (MIMO) system comprises an open-loop DMRS multiplexing unit and a weighting processing unit; wherein,

the open-loop DMRS multiplexing unit is used for multiplexing different groups of open-loop DMRSs on one or more OFDM symbols in 2 nd, 3 rd, 5 th, 6 th, 9 th and 10 th OFDM symbols by using CDM and/or TDM and/or FDM technology in a special subframe;

and the weighting processing unit is used for performing corresponding weighting processing by using the same or different weights for different groups of open-loop DMRSs.

The OFDM symbol carrying the open-loop DMRS is a {2, 3, 9, 10} th OFDM symbol; or,

the OFDM symbols carrying the open-loop DMRS are {2, 3} th OFDM symbols and {5, 6} th OFDM symbols; or,

the open-loop DMRS is carried on the {2, 6} th OFDM symbol; or,

the open-loop DMRS is carried on {2, 5, 6, 10} th OFDM symbol; or,

the open-loop DMRS is carried on the {2, 5, 6, 9} th OFDM symbol.

The reference signal processing method and the system of the open-loop MIMO system realize the sending of the open-loop MIMO through the DMRS, thereby reducing the extra resource overhead caused by the common reference signal pilot frequency, for example, the open-loop pilot frequency design is carried out based on the DMRS, the precoding weight or the beam forming weight at the network side can not be limited by a codebook, the accuracy of the precoding or beam forming weight is greatly improved, and the performance of the UE in the open-loop mode can be improved as much as possible on the basis of not increasing the complexity of the UE realization, the test complexity and the resource consumption.

Drawings

Fig. 1 and fig. 2 are schematic diagrams of DMRS group mapping patterns of a time division multiplexing or time domain spreading normal cyclic prefix (NormalCP)12 according to an embodiment of the present invention;

fig. 3 and fig. 4 are schematic diagrams of DMRS group mapping patterns of a time division multiplexing or time domain spreading Normal CP 4 according to an embodiment of the present invention;

fig. 5 to 10 are schematic diagrams of DMRS group mapping patterns of a time division multiplexing or time domain spreading Normal CP 2 according to an embodiment of the present invention;

fig. 11, 19, 15, and 23 are schematic diagrams of DMRS group mapping patterns of frequency division multiplexing or frequency domain spreading Normal CP 2 according to an embodiment of the present invention;

fig. 12, 13, 16, 17, 20, 21, 24, 25, 27, 29, 31, 33 are diagrams of DMRS group mapping patterns of frequency division multiplexing or frequency domain spreading Normal CP 4 according to an embodiment of the present invention;

fig. 14, 18, 22, 26, 28, 30, 32, 34 are schematic diagrams of DMRS group mapping patterns of frequency division multiplexing or frequency domain spreading Normal CP 8 according to an embodiment of the present invention;

FIG. 35 is a simplified reference signal processing flow diagram for an open-loop MIMO system according to an embodiment of the present invention;

fig. 36 is a reference signal processing system diagram of an open-loop MIMO system according to an embodiment of the present invention.

Detailed Description

In practical applications, different groups of open-loop demodulation reference signals may be multiplexed on one or more OFDM symbols by using CDM and/or TDM and/or FDM techniques, and the different groups of open-loop demodulation reference signals are processed by using the same or different weights, so that a resource block performs corresponding weighting processing by using a plurality of different weights. Specifically, the weights include precoding weights and/or beamforming weights, and the weighting process includes: and performing corresponding precoding and/or beamforming processing by using the precoding weight and/or the beamforming weight.

Preferably, the OFDM symbol carrying the open-loop DMRS may be a {2, 3, 9, 10} th OFDM symbol.

Preferably, the open-loop DMRSs may be carried on 0 th to 11 th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, where the 0 th to 11 th subcarriers carry the same or different DMRS groups, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, where DMRS group 0 is carried on the {0, 4} th subcarriers, DMRS group 1 is carried on the {1, 5} th subcarriers, DMRS group 2 is carried on the {6, 10} th subcarriers, and DMRS group 3 is carried on the {7, 11} th subcarriers, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by TDM and/or CDM, when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two adjacent pilot resource elements of the same subcarrier located on {2, 3} and/or {9, 10} OFDM symbols, respectively, and the walsh code may use [1, 1], [1, -1 ]. When each DMRS group includes more than two DMRS ports, the walsh code may be used to multiplex more than two ports on four pilot resource elements located on the same subcarrier on {2, 3} and {9, 10} OFDM symbols, and the walsh code may use [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, -1, 1], or each 2 k-th DMRS group and 2k +1DMRS group is a precoding group, and different DMRS groups in the same precoding group are precoded using weights of different layers of the same precoding, where k is a non-negative integer.

Preferably, the open-loop DMRS may be carried on {1, 5, 7, 11} th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, where DMRS group 0 is carried on the {1, 5} th subcarriers, DMRS group 1 is carried on the {7, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 5, 6, 11} th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, where DMRS group 0 is carried on the {0, 5} th subcarriers, and DMRS group 1 is carried on the {6, 11} th subcarriers, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by TDM and/or CDM, when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two adjacent pilot resource elements of the same subcarrier located on {2, 3} and/or {9, 10} OFDM symbols, respectively, and the walsh code may use [1, 1], [1, -1 ]. When each DMRS group includes more than two DMRS ports, a walsh code may be used to multiplex more than two ports on four pilot resource elements of the same sub-carrier located on {2, 3} and {9, 10} OFDM symbols, the walsh code may use [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1], and/or pilot resources on different pilot sub-carriers in the same DMRS group use different layers of weights of the same precoding, and pilot resources on the same pilot sub-carriers use weights of the same layer of the same precoding.

Preferably, the open-loop DMRS may be carried on {0, 4, 6, 10} th subcarriers of {2, 3} th and {1, 5, 7, 11} th subcarriers of {9, 10} OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by TDM and/or CDM, and when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two pilot resource elements of the same subcarrier located on {2, 3} and/or {9, 10} OFDM symbols, and the walsh code may use [1, 1], [1, -1 ]. When more than two DMRS ports are included in each DMRS group, a walsh code may be used to perform multiplexing of more than two ports on the {0} th subcarrier on {2, 3} OFDM symbols and the {1} th subcarrier on {9, 10} OFDM symbols, the {4} th subcarrier on {2, 3} OFDM symbols and the {5} th subcarrier on {9, 10} OFDM symbols, the {6} th subcarrier on {2, 3} OFDM symbols and the {7} th subcarrier on {9, 10} OFDM symbols, the {10} th subcarrier on {2, 3} OFDM symbols and the {11} th subcarrier on {9, 10} OFDM symbols, and the walsh code may use [1, 1, 1, 1], [1, -1],1, -1, 1]. And/or the {0} th subcarrier on {2, 3} OFDM symbols and the {1} th subcarrier on {9, 10} OFDM symbols are precoding layer groups 0, the {4} th subcarrier on {2, 3} OFDM symbols and the {5} th subcarrier on {9, 10} OFDM symbols are precoding layer groups 1, the {6} th subcarrier on {2, 3} OFDM symbols and the {7} th subcarrier on {9, 10} OFDM symbols are precoding layer groups 2, the {10} th subcarrier on {2, 3} OFDM symbols and the {11} th subcarrier on {9, 10} OFDM symbols are precoding layer groups 3. And weights of different layers with the same precoding weight are used for precoding among different layer groups in the same DMRS group, and weights of the same layer with the same precoding weight are used for precoding in different layer groups in the same DMRS group.

Preferably, the OFDM symbols carrying the open-loop DMRS are {2, 3} th and {5, 6} th OFDM symbols.

Preferably, the open-loop DMRSs may be carried on 0 th to 11 th subcarriers of {2, 3} th and {5, 6} th OFDM symbols, where the 0 th to 11 th subcarriers carry the same or different DMRS groups, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 3} th and {5, 6} th OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by TDM and/or CDM, when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two adjacent pilot resource elements of the same subcarrier located on {2, 3} and/or {5, 6} OFDM symbols, and the walsh code may use [1, 1], [1, -1 ]. When each DMRS group includes more than two DMRS ports, the walsh code may be used to multiplex more than two ports on four pilot resource elements located on the same subcarrier on {2, 3} and {5, 6} OFDM symbols, and the walsh code may use [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, -1, 1], or each 2 k-th DMRS group and 2k +1DMRS group is a precoding group, and different DMRS groups in the same precoding group are precoded using weights of different layers of the same precoding, where k is a non-negative integer.

Preferably, the open-loop DMRS may be carried on {1, 5, 7, 11} th subcarriers of {2, 3} th and {5, 6} th OFDM symbols, where DMRS group 0 is carried on the {1, 5} th subcarriers, DMRS group 1 is carried on the {7, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 5, 6, 11} th subcarriers of {2, 3} th and {5, 6} th OFDM symbols, where DMRS group 0 is carried on the {0, 5} th subcarriers, and DMRS group 1 is carried on the {6, 11} th subcarriers, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by TDM and/or CDM, when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two adjacent pilot resource elements of the same subcarrier located on {2, 3} and/or {5, 6} OFDM symbols, and the walsh code may use [1, 1], [1, -1 ]. When each DMRS group includes more than two DMRS ports, a walsh code may be used to multiplex more than two ports on four pilot resource elements of the same sub-carrier located on {2, 3} and {5, 6} OFDM symbols, the walsh code may use [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1], and/or pilot resources on different pilot sub-carriers in the same DMRS group use different layers of weights of the same precoding, and pilot resources on the same pilot sub-carriers use weights of the same layer of the same precoding.

Preferably, the open-loop DMRS may be carried on {0, 4, 6, 10} th subcarriers of {2, 3} th OFDM symbols and {1, 5, 7, 11} th subcarriers of {5, 6} th OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by TDM and/or CDM, and when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two pilot resource elements of the same subcarrier located on {2, 3} and/or {5, 6} OFDM symbols, and the walsh code may use [1, 1], [1, -1 ]. When more than two DMRS ports are included in each DMRS group, walsh codes may be used to multiplex more than two ports on four pilot resource elements on the 0 th subcarrier on the 2, 3 OFDM symbols and the 1 st subcarrier on the 5, 6 OFDM symbols, to multiplex more than two ports on four pilot resource elements on the 4 th subcarrier on the 2, 3 OFDM symbols and the 5 th subcarrier on the 5, 6 OFDM symbols, to multiplex more than two ports on four pilot resource elements on the 6 th subcarrier on the 2, 3 OFDM symbols and the 7 th subcarrier on the 5, 6 OFDM symbols, and to multiplex more than two ports on four pilot resource elements on the 10 th subcarrier on the 2, 3 OFDM symbols and the 11 th subcarrier on the 5, 6 OFDM symbols, walsh codes can be used as [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ]. And/or the {0} th subcarrier on {2, 3} OFDM symbols and the {1} th subcarrier on {5, 6} OFDM symbols are precoding layer groups 0, the {4} th subcarrier on {2, 3} OFDM symbols and the {5} th subcarrier on {5, 6} OFDM symbols are precoding layer groups 1, the {6} th subcarrier on {2, 3} OFDM symbols and the {7} th subcarrier on {5, 6} OFDM symbols are precoding layer groups 2, the {10} th subcarrier on {2, 3} OFDM symbols and the {11} th subcarrier on {5, 6} OFDM symbols are precoding layer groups 3. And weights of different layers with the same precoding weight are used for precoding among different layer groups in the same DMRS group, and weights of the same layer with the same precoding weight are used for precoding in different layer groups in the same DMRS group.

Preferably, the open-loop DMRS may be carried on the {2, 6} th OFDM symbol.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 6} th OFDM symbol in OFDM, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 6} th OFDM symbol in OFDM, where the DMRS group 0 is carried on the {0, 1} th subcarrier, the DMRS group 1 is carried on the {4, 5} th subcarrier, the DMRS group 2 is carried on the {6, 7} th subcarrier, and the DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 7, 8, 10, 11} th subcarriers of {2, 6} th OFDM symbol, where DMRS group 0 is carried on the {0, 1, 3, 4} th subcarriers, DMRS group 1 is carried on the {7, 8, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 7, 8, 10, 11} th subcarriers of {2, 6} th OFDM symbol, where the DMRS group 0 is carried on the {0, 1} th subcarrier, the DMRS group 1 is carried on the {3, 4} th subcarrier, the DMRS group 2 is carried on the {7, 8} th subcarrier, and the DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 6, 7, 9, 10} th subcarriers of {2} th OFDM symbol and {1, 2, 4, 5, 7, 8, 10, 11} th subcarriers of {6} th OFDM symbol, where DMRS group 0 is carried on the {0, 1, 2, 3, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 8, 9, 10, 11} th subcarriers, and the same precoding or beamforming weights are used in each DMRS group and the same or different precoding or beamforming weights are used between the groups.

Preferably, the open-loop DMRS may be carried on 0, 1, 3, 4, 6, 7, 9, 10 th subcarriers of 2 th OFDM symbol and {1, 2, 4, 5, 7, 8, 10, 11} th subcarriers of 6 th OFDM symbol, wherein the 0 th, 1 th subcarriers on the 2 th OFDM symbol and the 1 st, 2 th subcarriers on the 6 th OFDM symbol carry DMRS group 0, 3, 4 th subcarriers on the 2 th OFDM symbol and the 4 th, 5 th subcarriers on the 6 th OFDM symbol carry DMRS group 1, 6, 7 th subcarriers on the 2 th OFDM symbol and the 7 th, 8 th subcarriers on the 6 th OFDM symbol carry DMRS group 1, 9 th, 10 th subcarriers on the 2 th OFDM symbol and the 10 th subcarriers on the 6 th OFDM symbol, and 11, the sub-carriers bear DMRS groups 3, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by FDM and/or frequency-domain CDM, and when two DMRS ports are included in each DMRS group, a walsh code may be used to multiplex two ports on two pilot resource elements of adjacent subcarriers located on {2} and/or {6} OFDM symbols, and the walsh code may use [1, 1], [1, -1 ]. When more than two DMRS ports are included in each DMRS group, walsh codes may be used to multiplex {2} and/or {6} OFDM symbols on four adjacent pilot resource elements on the same DMRS group on the same OFDM symbol for more than two ports. Walsh codes can be used as [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

Preferably, the open-loop DMRS may be carried on the {2, 5, 6, 10} th OFDM symbol.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbol in OFDM, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbol in OFDM, where DMRS group 0 is carried on the {0, 1} th subcarrier, DMRS group 1 is carried on the {4, 5} th subcarrier, DMRS group 2 is carried on the {6, 7} th subcarrier, DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used for DMRS between groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 7, 8, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbol, where DMRS group 0 is carried on the {0, 1, 3, 4} th subcarriers, DMRS group 1 is carried on the {7, 8, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 7, 8, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbol, where DMRS group 0 is carried on the {0, 1} th subcarrier, DMRS group 1 is carried on the {3, 4} th subcarrier, DMRS group 2 is carried on the {7, 8} th subcarrier, DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups.

Preferably, the open-loop DMRS may be carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2, 6} th OFDM symbol and on the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {5, 10} th OFDM symbol, where the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Preferably, the open-loop DMRS may be carried on the 0 th, 1, 3, 4, 6, 7, 9, 10 th subcarriers of the 2 th, 6 th OFDM symbol and the 1 st, 2, 4, 5, 7, 8, 10, 11 th subcarriers of the 5 th, 10 th OFDM symbol, wherein the 0 th, 1 th subcarriers on the 2 th OFDM symbol and the 1 st, 2 th subcarriers on the 5 th OFDM symbol carry DMRS group 0, the 3 rd, 4 th subcarriers on the 2 th OFDM symbol and the 4 th, 5 th subcarriers on the 5 th OFDM symbol carry DMRS group 1, the 6 th, 7 th subcarriers on the 2 th OFDM symbol and the 7 th, 8 th subcarriers on the 5 th OFDM symbol carry DMRS group 2, the 9 th, 10 th subcarriers on the 2 th OFDM symbol and the 10 th subcarriers on the 5 th OFDM symbol, DMRS group 3 is carried on 11} subcarriers, DMRS group 4 is carried on {0, 1} th subcarrier on {6} th OFDM symbol and {1, 2} th subcarrier on {10} th OFDM symbol, DMRS group 4 is carried on {3, 4} th subcarrier on {6} th OFDM symbol and {4, 5} th subcarrier on {4, 5} th OFDM symbol, DMRS group 5 is carried on {6, 7} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {7, 8} th subcarrier on {10} th OFDM symbol, DMRS group 6 is carried on {9, 10} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {10, 11} th subcarrier on {10} th OFDM symbol, the same precoding or beamforming weights are used within each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by FDM and/or frequency-domain CDM, and when two DMRS ports are included in each DMRS group, two ports may be multiplexed on two pilot resource elements of adjacent subcarriers located on {2} and/or {5} and/or {6} and/or {10} OFDM symbols by using a walsh code, and the walsh code may use [1, 1], [1, -1 ]. When each DMRS group includes more than two DMRS ports, walsh codes may be used to multiplex more than two ports on four adjacent pilot resource elements of the same DMRS group on the same OFDM symbol on {2} and/or {5} and/or {6} and/or {10} OFDM symbols. Walsh codes can be used as [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

Preferably, the open-loop DMRS may be carried on the {2, 5, 6, 9} th OFDM symbol.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol in OFDM, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol in OFDM, where DMRS group 0 is carried on the {0, 1} th subcarriers, DMRS group 1 is carried on the {4, 5} th subcarriers, DMRS group 2 is carried on the {6, 7} th subcarriers, and DMRS group 3 is carried on the {10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used for DMRS between groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 7, 8, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol, where DMRS group 0 is carried on the {0, 1, 3, 4} th subcarriers, DMRS group 1 is carried on the {7, 8, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

Preferably, the open-loop DMRS may be carried on {0, 1, 3, 4, 7, 8, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol, where DMRS group 0 is carried on the {0, 1} th subcarrier, DMRS group 1 is carried on the {3, 4} th subcarrier, DMRS group 2 is carried on the {7, 8} th subcarrier, DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups.

Preferably, the open-loop DMRS may be carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2, 6} th OFDM symbol and on the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {5, 9} th OFDM symbol, where the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

Preferably, the open-loop DMRS may be carried on the 0 th, 1, 3, 4, 6, 7, 9, 10 th subcarriers of the 2 th, 6 th OFDM symbol and the 1 st, 2, 4, 5, 7, 8, 10, 11 th subcarriers of the 5 th, 9 th OFDM symbol, wherein the 0 th, 1 th subcarriers on the 2 th OFDM symbol and the 1 st, 2 th subcarriers on the 5 th OFDM symbol carry DMRS group 0, the 3 rd, 4 th subcarriers on the 2 th OFDM symbol and the 4 th, 5 th subcarriers on the 5 th OFDM symbol carry DMRS group 1, the 6 th, 7 th subcarriers on the 2 th OFDM symbol and the 7 th, 8 th subcarriers on the 5 th OFDM symbol carry DMRS group 2, the 9 th, 10 th subcarriers on the 2 th OFDM symbol and the 10 th subcarriers on the 5 th OFDM symbol, DMRS group 3 is carried on 11} subcarriers, DMRS group 4 is carried on {0, 1} th subcarrier on {6} th OFDM symbol and {1, 2} th subcarrier on {9} th OFDM symbol, DMRS group 4 is carried on {3, 4} th subcarrier on {6} th OFDM symbol and {4, 5} th subcarrier on {4, 5} th OFDM symbol, DMRS group 5 is carried on {6, 7} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {7, 8} th subcarrier on {9} th OFDM symbol, DMRS group 6 is carried on {9, 10} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {10, 11} th subcarrier on {9} th OFDM symbol, the same precoding or beamforming weights are used within each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

Preferably, for each DMRS group, different DMRS ports may be multiplexed by FDM and/or frequency-domain CDM, and when two DMRS ports are included in each DMRS group, two ports may be multiplexed on two pilot resource elements of adjacent subcarriers located on {2} and/or {5} and/or {6} and/or {9} OFDM symbols by using a walsh code, and the walsh code may use [1, 1], [1, -1 ]. When more than two DMRS ports are included in each DMRS group, walsh codes may be used to multiplex more than two ports on the adjacent four pilot resource elements of the same DMRS group on the same OFDM symbol on {2} and/or {5} and/or {6} and/or {9} OFDM symbols. Walsh codes can be used as [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

It should be noted that the { i } th OFDM symbol (where 0. ltoreq. i.ltoreq.11) represents the ith OFDM symbol. The group number or port number used in the present invention is only for distinguishing different groups and ports, and there is no limitation on the numbering order of the groups and ports.

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

The first embodiment is as follows:

fig. 1 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, which includes 12 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 9, 10} th OFDM symbol. Let the RE (resource element) positions occupied by DMRS groups 0 to 11 be (x0 to 11, y0 to 11), respectively, where x denotes a subcarrier number index within one RB (resource block), and y denotes an index of an OFDM symbol. { x (m), y (m) }, { m, (2, 3, 9, 10) }, wherein m ═ 0 to 11.

Optionally, for each DMRS group, different DMRS ports may be multiplexed by using a TDM and/or CDM method, different DMRS groups may use the same or different precoding weights, different DMRS groups may also use weights of different layers of the same precoding weight, and the same DMRS group uses the same precoding weight and/or the weight of the same layer of the same precoding weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example two:

fig. 2 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, which includes 12 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 5, 6} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 11 be (x0 to 11, y0 to 11), respectively, where x denotes a subcarrier number index within one RB and y denotes an index of an OFDM symbol. { x (m), y (m) }, { m, (2, 3, 5, 6) }, wherein m ═ 0 to 11.

Optionally, for each DMRS group, different DMRS ports may be multiplexed by using TDM and/or CDM, and when each DMRS includes two DMRS ports, a walsh code may be used to perform multiplexing of two ports on two adjacent pilot resource elements of the same subcarrier located on {2, 3, 5, 6} OFDM symbols, where [1, 1], [1, -1 ]. Different DMRS groups can adopt the same and/or different pre-coding weights and/or different layers of weights with the same pre-coding weight, and the same DMRS groups adopt the same pre-coding weight and/or the same layer of weights with the same pre-coding weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example three:

fig. 3 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 5, 6} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 4), (2, 3, 5, 6) }, { x1, y1} { (1, 5), (2, 3, 5, 6) }, { x2, y2} { (6, 10), (2, 3, 5, 6) }, { x3, y3} { (7, 11), (2, 3, 5, 6) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights for different DMRS groups using the same precoding weight, and the same DMRS groups use the same precoding weight and/or weights of the same layer of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example four:

fig. 4 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 9, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 4), (2, 3, 9, 10) }, { x1, y1} { (1, 5), (2, 3, 9, 10) }, { x2, y2} { (6, 10), (2, 3, 9, 10) }, { x3, y3} { (7, 11) (2, 3, 9, 10) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights for different DMRS groups using the same precoding weight, and the same DMRS groups use the same precoding weight and/or weights of the same layer of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example five:

fig. 5 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 5, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 5), (2, 3, 5, 6) }, { x1, y1} { (7, 11) (2, 3, 5, 6) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights for different DMRS groups using the same precoding weights, and the same DMRS groups use the same precoding weights and/or weights for the same layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example six:

fig. 6 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 9, 10} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 5), (2, 3, 9, 10) }, { x1, y1} { (7, 11), (2, 3, 9, 10) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or the same layer weights of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example seven:

fig. 7 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 5, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 4), (2, 3) }, { (1, 5), (5, 6) } }, { x1, y1} { (1, 5), (2, 3) }, { (7, 11), (5, 6) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights using the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or weights for the same layer using the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example eight:

fig. 8 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 9, 10} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 4), (2, 3) }, { (1, 5), (9, 10) } }, { x1, y1} { (1, 5), (2, 3) }, { (7, 11), (9, 10) } }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights using the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or weights for the same layer using the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example nine:

fig. 9 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 5, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 5), (2, 3, 5, 6) }, { x1, y1} { (6, 11), (2, 3, 5, 6) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or the same layer weights of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example ten:

fig. 10 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to {2, 3, 9, 10} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 5), (2, 3, 9, 10) }, { x1, y1} { (6, 11), (2, 3, 9, 10) }, optionally, different DMRS ports may be multiplexed in a TDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or the same layer weights of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example eleven:

fig. 11 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 4, 5), (2, 6) }, { x1, y1} { (6, 7, 10, 11), (2, 6) }, optionally, different DMRS ports may be multiplexed in an FDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or the same layer weights of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twelve:

fig. 12 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 4, 5), (2, 5) }, { x1, y1} { (6, 7, 10, 11), (2, 5) }, { x2, y2} { (0, 1, 4, 5), (6, 10) }, { x3, y3} { (6, 7, 10, 11), (6, 10) }, optionally, different DMRS ports may be multiplexed by means of FDM and/or CDM within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights of different DMRS groups using the same precoding weight, the same precode group uses the same precoding weight and/or weights of the same layer of the same precoding weight or weights of different layers of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example thirteen:

fig. 13 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), (2, 6) }, { x1, y1} { (4, 5), (2, 6) }, { x2, y2} { (6, 7), (2, 6) }, { x3, y3} { (10, 11), (2, 6) }, optionally, within each DMRS group, different DMRS ports may be multiplexed in an FDM and/or CDM manner, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or weights of the same layer of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example fourteen:

fig. 14 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), (2, 5) }, { x1, y1} { (4, 5), (2, 5) }, { x2, y2} { (6, 7), (2, 5) }, { x3, y3} { (10, 11), (2, 5) }, { x4, y4} { (0, 1), (6, 10) }, { x5, y5} { (4, 5), (6, 10) }, { x6, y6} { (6, 7), (6, 10) }, { x7, y7} { (10, 11), (6, 10) }, optionally, different DMRS groups may be multiplexed with different DMRS ports in the same precoding weight set and/or the same precoding weight set of the same layer, or the same precoding weight set of the same DMRS weight, or different DMRS weight sets of the same precoding weight set of the same layer, or different DMRS weights of the same precoding weight set Weights for different layers of values. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example fifteen:

fig. 15 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 3, 4), (2, 6) }, { x1, y1} { (7, 8, 10, 11), (2, 6) }, optionally, different DMRS ports may be multiplexed in an FDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or the same layer weights of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example sixteen:

fig. 16 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 3, 4), (2, 5) }, { x1, y1} { (7, 8, 10, 11), (2, 5) }, { x2, y2} { (0, 1, 3, 4), (6, 10) }, { x3, y3} { (7, 8, 10, 11), (6, 10) }, optionally, different DMRS ports may be multiplexed by means of FDM and/or CDM within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights of different DMRS groups using the same precoding weight, the same precode group uses the same precoding weight and/or weights of the same layer of the same precoding weight or weights of different layers of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example seventeen:

fig. 17 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), (2, 6) }, { x1, y1} { (3, 4), (2, 6) }, { x2, y2} { (7, 8), (2, 6) }, { x3, y3} { (10, 11), (2, 6) }, optionally, within each DMRS group, different DMRS ports may be multiplexed in an FDM and/or CDM manner, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or weights of the same layer of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

EXAMPLE eighteen

Fig. 18 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), (2, 5) }, { x1, y1} { (3, 4), (2, 5) }, { x2, y2} { (7, 8), (2, 5) }, { x3, y3} { (10, 11), (2, 5) }, { x4, y4} { (0, 1), (6, 10) }, { x5, y5} { (3, 4), (6, 10) }, { x6, y6} { (7, 8), (6, 10) }, { x7, y7} { (10, 11), (6, 10) }, optionally, different DMRS groups may be multiplexed with different DMRS ports in the same precoding weight set and/or different precoding weight sets, the same DMRS weight set of the same layer, or different precoding weight sets of the same DMRS weight set of the same layer, or different DMRS weight sets of the same precoding weight set of the same layer Weights for different layers of values. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example nineteenth:

fig. 19 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2, 4, 5), (2, 6) }, { x1, y1} { (7, 8, 10, 11), (2, 6) }, optionally, different DMRS ports may be multiplexed in an FDM and/or CDM manner within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or the same layer weights of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty:

fig. 20 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2, 4, 5), (2, 5) }, { x1, y1} { (7, 8, 10, 11), (2, 5) }, { x2, y2} { (1, 2, 4, 5), (6, 10) }, { x3, y3} { (7, 8, 10, 11), (6, 10) }, optionally, different DMRS ports may be multiplexed by means of FDM and/or CDM within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights of different DMRS groups using the same precoding weight, the same precode group uses the same precoding weight and/or weights of the same layer of the same precoding weight or weights of different layers of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty one:

fig. 21 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2), (2, 6) }, { x1, y1} { (4, 5), (2, 6) }, { x2, y2} { (7, 8), (2, 6) }, { x3, y3} { (10, 11), (2, 6) }, optionally, within each DMRS group, different DMRS ports may be multiplexed in an FDM and/or CDM manner, different DMRS groups may use the same and/or different precode weights and/or different layer weights of the same precoding weights for different DMRS groups, and the same DMRS groups use the same precoding weights and/or weights of the same layer of the same precoding weights or weights of different layers of the same precoding weights. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty two:

fig. 22 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2), (2, 5) }, { x1, y1} { (4, 5), (2, 5) }, { x2, y2} { (7, 8), (2, 5) }, { x3, y3} { (10, 11), (2, 5) }, { x4, y4} { (1, 2), (6, 10) }, { x5, y5} { (4, 5), (6, 10) }, { x6, y6} { (7, 8), (6, 10) }, { x7, y7} { (10, 11), (6, 10) }, optionally, different DMRS groups may be multiplexed with different DMRS ports in the same precoding weight set and/or different precoding weight sets, the same DMRS weight set of the same layer, or different precoding weight sets of the same DMRS weight set of the same layer, or different DMRS weight sets of the same precoding weight set of the same layer Weights for different layers of values. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty three:

fig. 23 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 2 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS group 0 to group 1 be (x0 to 1, y0 to 1), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 3, 4), 2}, { (1, 2, 4, 5), 6} }, { x1, y1} { (6, 7, 9, 10), 2}, { (7, 8, 10, 11), 6} }, optionally, different DMRS ports may be multiplexed in FDM and/or CDM for each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different DMRS groups use different layer weights of the same precoding weight, and the same DMRS groups use the same precoding weight and/or the same layer weight of the same precoding weight or different layer weights of the same precoding weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty-four:

fig. 24 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 3, 4), 2}, { (1, 2, 4, 5), 5} }, { x1, y1} { (6, 7, 9, 10), 2}, { (7, 8, 10, 11), 5} }, { x2, y2} { (0, 1, 3, 4), 6}, { (1, 2, 4, 5), 10} }, { x1, y1} { (6, 7, 9, 10), 6}, { (7, 8, 10, 11), 10} }, optionally, for each DMRS group, different DMRS ports can be multiplexed by adopting FDM and/or CDM modes, different DMRS groups can adopt the same and/or different precoding weights and/or different layers of weights of the same precoding weights for different DMRS groups, and the same DMRS group adopts the same precoding weight and/or the weight of the same layer of the same precoding weight or the weight of different layers of the same precoding weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty-five:

fig. 25 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to the {2, 6} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), 2}, { (1, 2), 6} }, { x1, y1} { (3, 4), 2}, { (4, 5), 6}, { x2, y2} { (6, 7), 2}, { (7, 8), 6}, { x3, y3} { (9, 10), 2}, { (10, 11), 6} optionally, different DMRS groups may be multiplexed with FDM and/or DMRS within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different DMRS groups use different weights for the same precoding weight, the same precoding weight and/or different weights for the same layer or weights for different layers of the same precoding weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty-six:

fig. 26 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 10} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), 2}, { (1, 2), 5} }, { x1, y1} { (3, 4), 2}, { (4, 5), 5} }, { x2, y2} { (6, 7), 2}, { (7, 8), 5} }, { x3, y3} { (9, 10), 2}, { (10, 11), 5} }, { x4, y4} { (0, 1), 6} { (1, 2), 10} }, { x5, y5} { (3, 4), 6}, { (4, 5), 10} }, { x6, y6} { (6, 7), 6, { (7, 8), 10}, { (3, 4), 6}, { (4, 5), 10}, { (9, 859 }, optionally with different modes for each set of DMRS, and dm rs 8911, optionally set, dm rs, 10, and optionally set 18, 10, 18, optionally set, for each set, dm rs, 10, dm rs, and dm rs, different DMRS groups can adopt the same and/or different pre-coding weights and/or different layers of weights with the same pre-coding weight for different DMRS groups, and the same pre-coding weight and/or the same layer of weights with the same pre-coding weight or weights with different layers of the same pre-coding weight for the same DMRS group. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty-seven:

fig. 27 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2, 4, 5), (2, 5) }, { x1, y1} { (7, 8, 10, 11), (2, 5) }, { x2, y2} { (1, 2, 4, 5), (6, 9) }, { x3, y3} { (7, 8, 10, 11), (6, 9) }, optionally, different DMRS ports may be multiplexed by means of FDM and/or CDM within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights of different DMRS groups using the same precoding weight, the same precode group uses the same precoding weight and/or weights of the same layer of the same precoding weight or weights of different layers of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty-eight:

fig. 28 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2), (2, 5) }, { x1, y1} { (4, 5), (2, 5) }, { x2, y2} { (7, 8), (2, 5) }, { x3, y3} { (10, 11), (2, 5) }, { x4, y4} { (1, 2), (6, 9) }, { x5, y5} { (4, 5), (6, 9) }, { x6, y6} { (7, 8), (6, 9) }, { x7, y7} { (10, 11), (6, 9) }, optionally, different DMRS groups may be multiplexed with different DMRS ports in the same precoding weight set and/or different precoding weight sets, or different DMRS weight sets of the same precoding weight set of the same layer, or different DMRS weight sets of the same precoding weight set Weights for different layers of values. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example twenty-nine:

fig. 29 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 3, 4), (2, 5) }, { x1, y1} { (7, 8, 10, 11), (2, 5) }, { x2, y2} { (0, 1, 3, 4), (6, 9) }, { x3, y3} { (7, 8, 10, 11), (6, 9) }, optionally, different DMRS ports may be multiplexed by means of FDM and/or CDM within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights of different DMRS groups using the same precoding weight, the same precode group uses the same precoding weight and/or weights of the same layer of the same precoding weight or weights of different layers of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example thirty:

fig. 30 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), (2, 5) }, { x1, y1} { (3, 4), (2, 5) }, { x2, y2} { (7, 8), (2, 5) }, { x3, y3} { (10, 11), (2, 5) }, { x4, y4} { (0, 1), (6, 9) }, { x5, y5} { (3, 4), (6, 9) }, { x6, y6} { (7, 8), (6, 9) }, { x7, y7} { (10, 11), (6, 9) }, optionally, different DMRS groups may be multiplexed with different DMRS ports in the same precoding weight set and/or different precoding weight sets, or different DMRS weight sets of the same precoding weight set of the same layer, or different DMRS weight sets of the same precoding weight set Weights for different layers of values. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example thirty one:

fig. 31 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2, 4, 5), (2, 5) }, { x1, y1} { (7, 8, 10, 11), (2, 5) }, { x2, y2} { (1, 2, 4, 5), (6, 9) }, { x3, y3} { (7, 8, 10, 11), (6, 9) }, optionally, different DMRS ports may be multiplexed by means of FDM and/or CDM within each DMRS group, different DMRS groups may use the same and/or different precoded weights and/or different layers of weights of different DMRS groups using the same precoding weight, the same precode group uses the same precoding weight and/or weights of the same layer of the same precoding weight or weights of different layers of the same weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example thirty-two:

fig. 32 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (1, 2), (2, 5) }, { x1, y1} { (4, 5), (2, 5) }, { x2, y2} { (7, 8), (2, 5) }, { x3, y3} { (10, 11), (2, 5) }, { x4, y4} { (1, 2), (6, 9) }, { x5, y5} { (4, 5), (6, 9) }, { x6, y6} { (7, 8), (6, 9) }, { x7, y7} { (10, 11), (6, 9) }, optionally, different DMRS groups may be multiplexed with different DMRS ports in the same precoding weight set and/or different precoding weight sets, or different DMRS weight sets of the same precoding weight set of the same layer, or different DMRS weight sets of the same precoding weight set Weights for different layers of values. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example thirty-three:

fig. 33 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 4 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 3 be (x0 to 3, y0 to 3), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1, 3, 4), 2}, { (1, 2, 4, 5), 5} }, { x1, y1} { (6, 7, 9, 10), 2}, { (7, 8, 10, 11), 5} }, { x2, y2} { (0, 1, 3, 4), 6}, { (1, 2, 4, 5), 9} }, { x1, y1} { (6, 7, 9, 10), 6}, { (7, 8, 10, 11), 9} }, optionally, for each DMRS group, different DMRS ports can be multiplexed by adopting FDM and/or CDM modes, different DMRS groups can adopt the same and/or different precoding weights and/or different layers of weights of the same precoding weights for different DMRS groups, and the same DMRS group adopts the same precoding weight and/or the weight of the same layer of the same precoding weight or the weight of different layers of the same precoding weight. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

Example thirty-four:

fig. 34 shows a pattern of a set of pilots for an open-loop DMRS in one subframe, including 8 DMRS sets.

The open-loop DMRS may be mapped to {2, 5, 6, 9} th OFDM symbol. Let the RE positions occupied by DMRS groups 0 to 7 be (x0 to 7, y0 to 7), respectively, where x denotes the index of the OFDM symbol relative to the subcarrier number within one RB, and y denotes the index of the OFDM symbol. { x0, y0} { (0, 1), 2}, { (1, 2), 5} }, { x1, y1} { (3, 4), 2}, { (4, 5), 5} }, { x2, y2} { (6, 7), 2}, { (7, 8), 5} }, { x3, y3} { (9, 10), 2}, { (10, 11), 5} }, { x4, y4} { (0, 1), 6} { (1, 2), 9} }, { x5, y5} { (3, 4), 6}, { (4, 5), 9} }, { x6, y6} { (6, 7), 6, { (7, 8), 9}, { (3, 4), 6}, { (859 }, { (9), and { x6, y6} { (6, 859 }, { (9) }, optionally with different modes for each set of DMRS, and dm rs 8911, 18, 9, optionally set, DMRS, and dm rs 9, and optionally set, preferably, dm rs (9, 10, 7, 10, 9, 11, respectively, different DMRS groups can adopt the same and/or different pre-coding weights and/or different layers of weights with the same pre-coding weight for different DMRS groups, and the same pre-coding weight and/or the same layer of weights with the same pre-coding weight or weights with different layers of the same pre-coding weight for the same DMRS group. Walsh codes [1, 1], [1, -1] or [1, 1, 1, 1], [1, 1, -1], [1, -1, 1] and [1, -1, -1, 1] can be used when different DMRS ports of resources within the same DMRS group are multiplexed using CDM.

With reference to the foregoing embodiments, the operation idea of the present invention for processing the reference signal of the open-loop MIMO system can be represented as a flow shown in fig. 35, where the flow includes the following steps:

step 3501: in a special subframe, different sets of open-loop DMRSs are multiplexed on one or more of the 2 nd, 3 rd, 5 th, 6 th, 9 th, 10 th OFDM symbols using CDM and/or TDM and/or FDM techniques.

Step 3502: and performing corresponding weighting processing by using the same or different weights aiming at different groups of open-loop DMRSs. Specifically, the weights include precoding weights and/or beamforming weights, and the weighting process includes: and performing corresponding precoding and/or beamforming processing by using the precoding weight and/or the beamforming weight.

In order to ensure that the above embodiments and operation idea can be realized smoothly, an arrangement as shown in fig. 36 may be performed. Referring to fig. 36, fig. 36 is a reference signal processing system diagram of an open-loop MIMO system according to an embodiment of the present invention, where the system includes an open-loop DMRS multiplexing unit and a weighting processing unit connected to each other.

In practical applications, the open-loop DMRS multiplexing unit can multiplex different sets of open-loop DMRSs on one or more of 2, 3, 5, 6, 9, 10 OFDM symbols in a special subframe using CDM and/or TDM and/or FDM techniques. The weighting processing unit can perform corresponding weighting processing by using the same or different weights for different groups of open-loop DMRSs.

In summary, in both the method and the system, the reference signal processing method of the open-loop MIMO system provided by the present invention performs open-loop pilot design based on DMRS, and the precoding weight or beamforming weight on the network side may not be limited by a codebook, so as to greatly improve the accuracy of the precoding or beamforming weight, and improve the performance of the UE in the open-loop mode as much as possible on the basis of not increasing the implementation complexity, the test complexity, and the resource consumption of the UE.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (26)

1. A reference signal processing method for an open-loop MIMO system, the method comprising:

multiplexing different sets of open-loop DMRSs on one or more OFDM symbols of 2 nd, 3 rd, 5 th, 6 th, 9 th, 10 th OFDM symbols using CDM and/or TDM and/or FDM techniques in a special subframe; and performing corresponding weighting processing by using the same or different weights aiming at different groups of open-loop DMRSs.

2. The method of claim 1,

the OFDM symbol carrying the open-loop DMRS is the {2, 3, 9, 10} th OFDM symbol.

3. The method of claim 2,

the open-loop DMRS are borne on 0 th to 11 th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, wherein the 0 th to 11 th subcarriers bear the same or different DMRS groups respectively, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 3} th and {9, 10} th OFDM symbols, where the {0, 4} th subcarrier carries DMRS group 0, the {1, 5} th subcarrier carries DMRS group 1, the {6, 10} th subcarrier carries DMRS group 2, and the {7, 11} th subcarrier carries DMRS group 3, and the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups.

4. The method of claim 3,

multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {9, 10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group contains more than two DMRS ports, the Walsh code is used for multiplexing more than two ports on four pilot resource elements of the same subcarrier on {2, 3} and {9, 10} OFDM symbols, the Walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, -1, 1], or each 2k DMRS group and 2k +1DMRS group is a precoding group, different DMRS groups in the same precoding group are precoded by using different layers of weights of the same precoding, wherein k is a non-negative integer.

5. The method of claim 2,

the open-loop DMRS is carried on {1, 5, 7, 11} sub-carriers of {2, 3} th and {9, 10} th OFDM symbols, wherein the {1, 5} sub-carriers carry DMRS group 0, the {7, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 5, 6, 11} sub-carriers of {2, 3} th and {9, 10} th OFDM symbols, wherein the {0, 5} sub-carrier carries DMRS group 0, the {6, 11} sub-carrier carries DMRS group 1, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

6. The method of claim 5,

multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {9, 10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group includes more than two DMRS ports, the walsh code is used to multiplex more than two ports on four pilot resource elements of the same sub-carrier located on {2, 3} and {9, 10} OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1], and/or the pilot resources on different pilot sub-carriers in the same DMRS group use different layers of weights of the same precoding, and the pilot resources on the same pilot sub-carriers use the same layers of weights of the same precoding.

7. The method of claim 2,

the open-loop DMRS is carried on {0, 4, 6, 10} th subcarriers of {2, 3} th and {1, 5, 7, 11} th subcarriers of {9, 10} OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

8. The method of claim 7,

multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, and when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {9, 10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when more than two DMRS ports are included in each DMRS group, then walsh codes are used to multiplex more than two ports on four pilot resource elements on the 0 th subcarrier on the 2, 3 OFDM symbols and the 1 st subcarrier on the 9, 10 OFDM symbols, multiplex more than two ports on the 4 th subcarrier on the 2, 3 OFDM symbols and more than two ports on four pilot resource elements on the 5 th subcarrier on the 9, 10 OFDM symbols, multiplex more than two ports on the 6 th subcarrier on the 2, 3 OFDM symbols and more than four pilot resource elements on the 7 th subcarrier on the 9, 10 OFDM symbols, and multiplex more than two ports on the 10 th subcarrier on the 2, 3 OFDM symbols and more than four pilot resource elements on the 11 th subcarrier on the 9, 10 OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ]; and/or the {0} sub-carrier on {2, 3} OFDM symbols and the {1} sub-carrier on {9, 10} OFDM symbols are a precoding layer group 0, the {4} sub-carrier on {2, 3} OFDM symbols and the {5} sub-carrier on {9, 10} OFDM symbols are a precoding layer group 1, the {6} sub-carrier on {2, 3} OFDM symbols and the {7} sub-carrier on {9, 10} OFDM symbols are a precoding layer group 2, the {10} sub-carrier on {2, 3} OFDM symbols and the {11} sub-carrier on {9, 10} OFDM symbols are precoding layer group 3; and weights of different layers with the same precoding weight are used for precoding among different layer groups in the same DMRS group, and weights of the same layer with the same precoding weight are used for precoding in different layer groups in the same DMRS group.

9. The method of claim 1,

the OFDM symbols carrying the open-loop DMRS are {2, 3} th and {5, 6} th OFDM symbols.

10. The method of claim 9,

the open-loop DMRS are borne on 0 th to 11 th subcarriers of {2, 3} th and {5, 6} th OFDM symbols, wherein the 0 th to 11 th subcarriers bear the same or different DMRS groups respectively, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} sub-carriers of {2, 3} th and {5, 6} OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} sub-carriers, DMRS group 1 is carried on the {6, 7, 10, 11} sub-carriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among DMRS groups.

11. The method of claim 10,

multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {5, 6} OFDM symbols by using walsh codes, wherein [1, 1], [1, -1] is used for wa1sh codes; when each DMRS group contains more than two DMRS ports, the Walsh code is used for multiplexing more than two ports on four pilot resource elements of the same subcarrier on {2, 3} and {5, 6} OFDM symbols, the Walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, -1, 1], or each 2k DMRS group and 2k +1DMRS group is a precoding group, different DMRS groups in the same precoding group are precoded by using different layers of weights of the same precoding, wherein k is a non-negative integer.

12. The method of claim 9,

the open-loop DMRS is carried on {1, 5, 7, 11} sub-carriers of {2, 3} th and {5, 6} th OFDM symbols, wherein the {1, 5} sub-carriers carry DMRS group 0, the {7, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 5, 6, 11} sub-carriers of {2, 3} th and {5, 6} th OFDM symbols, wherein the {0, 5} sub-carrier carries DMRS group 0, the {6, 11} sub-carrier carries DMRS group 1, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

13. The method of claim 12,

multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {5, 6} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group includes more than two DMRS ports, the walsh code is used to multiplex more than two ports on four pilot resource elements of the same sub-carrier located on {2, 3} and {5, 6} OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1], and/or the pilot resources on different pilot sub-carriers in the same DMRS group use different layers of weights of the same precoding, and the pilot resources on the same pilot sub-carriers use the same layers of weights of the same precoding.

14. The method of claim 9,

the open-loop DMRS is carried on {0, 4, 6, 10} th subcarriers of {2, 3} th OFDM symbols and {1, 5, 7, 11} th subcarriers of {5, 6} th OFDM symbols, where DMRS group 0 is carried on the {0, 1, 4, 5} th subcarriers, DMRS group 1 is carried on the {6, 7, 10, 11} th subcarriers, the same precoding or beamforming weights are used in each DMRS group, and the same or different precoding or beamforming weights are used among the DMRS groups.

15. The method of claim 14,

multiplexing different DMRS ports in a TDM and/or CDM manner in each DMRS group, and when each DMRS group comprises two DMRS ports, multiplexing two ports on two adjacent pilot resource elements of the same subcarrier on {2, 3} and/or {5, 6} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when more than two DMRS ports are included in each DMRS group, then walsh codes are used to multiplex more than two ports on four pilot resource elements on the 0 th subcarrier on the 2, 3 OFDM symbols and the 1 st subcarrier on the 5, 6 OFDM symbols, multiplex more than two ports on four pilot resource elements on the 4 th subcarrier on the 2, 3 OFDM symbols and the 5 th subcarrier on the 5, 6 OFDM symbols, multiplex more than two ports on four pilot resource elements on the 6 th subcarrier on the 2, 3 OFDM symbols and the 7 th subcarrier on the 5, 6 OFDM symbols, and multiplex more than two ports on four pilot resource elements on the 10 th subcarrier on the 2, 3 OFDM symbols and the 11 th subcarrier on the 5, 6 OFDM symbols, the walsh code uses [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ]; and/or the {0} sub-carrier on {2, 3} OFDM symbols and the {1} sub-carrier on {5, 6} OFDM symbols are a precoding layer group 0, the {4} sub-carrier on {2, 3} OFDM symbols and the {5} sub-carrier on {5, 6} OFDM symbols are a precoding layer group 1, the {6} sub-carrier on {2, 3} OFDM symbols and the {7} sub-carrier on {5, 6} OFDM symbols are a precoding layer group 2, the {10} sub-carrier on {2, 3} OFDM symbols and the {11} sub-carrier on {5, 6} OFDM symbols are precoding layer group 3; and weights of different layers with the same precoding weight are used for precoding among different layer groups in the same DMRS group, and weights of the same layer with the same precoding weight are used for precoding in different layer groups in the same DMRS group.

16. The method of claim 1,

the open-loop DMRS is carried on the 2, 6 th OFDM symbol.

17. The method of claim 16,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 6} th OFDM symbol of OFDM, wherein the {0, 1, 4, 5} th subcarriers carry DMRS group 0, the {6, 7, 10, 11} th subcarriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is borne on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 6} th OFDM symbol of OFDM, wherein the {0, 1} th subcarriers bear DMRS group 0, the {4, 5} th subcarriers bear DMRS group 1, the {6, 7} th subcarriers bear DMRS group 2, the {10, 11} th subcarriers bear DMRS group 3, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 6} th OFDM symbols, wherein the {0, 1, 3, 4} sub-carriers carry DMRS group 0, the {7, 8, 10, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is borne on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 6} th OFDM symbols, wherein the {0, 1} sub-carriers bear DMRS group 0, the {3, 4} sub-carriers bear DMRS group 1, the {7, 8} sub-carriers bear DMRS group 2, the {10, 11} sub-carriers bear DMRS group 3, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2} th OFDM symbol and the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {6} th OFDM symbol, wherein the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weight is used in the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} sub-carriers of the {2} th OFDM symbol and on the {1, 2, 4, 5, 7, 8, 10, 11} sub-carriers of the {6} th OFDM symbol, wherein the DMRS group 0 is carried on the {0, 1} sub-carriers on the {2} th OFDM symbol and on the {1, 2} sub-carriers on the {6} th OFDM symbol, the 3, 4} sub-carriers on the {2} th OFDM symbol and on the {4, 5} sub-carriers on the {4, 5} OFDM symbol carry the DMRS group 1 on the {6, 7} sub-carriers on the {2} th OFDM symbol and on the {7, 8} sub-carriers on the {6} th OFDM symbol, the 9, 10} sub-carriers on the {2} th OFDM symbol and the {10, 11} sub-carriers on the {6} OFDM symbol, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups.

18. The method of claim 16 or 17,

for each DMRS group, multiplexing different DMRS ports by adopting an FDM (frequency division multiplexing) and/or frequency-domain CDM (code division multiplexing), when each DMRS group comprises two DMRS ports, multiplexing two ports on two pilot resource elements of adjacent subcarriers positioned on {2} and/or {6} OFDM (orthogonal frequency division multiplexing) symbols by adopting a walsh code, wherein the walsh code adopts [1, 1], [1, -1 ]; when each DMRS group comprises more than two DMRS ports, the walsh codes are adopted to multiplex four adjacent pilot resource elements of {2} and/or {6} OFDM symbols on the same DMRS group on the same OFDM symbol, wherein the number of the pilot resource elements is more than two; walsh codes employ [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

19. The method of claim 1,

the open-loop DMRS is carried on the {2, 5, 6, 10} th OFDM symbol.

20. The method of claim 19,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbols of the OFDM, wherein the {0, 1, 4, 5} th subcarriers carry DMRS group 0, the {6, 7, 10, 11} th subcarriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 10} th OFDM symbols of the OFDM, wherein the DMRS group 0 is carried on the {0, 1} th subcarriers, the DMRS group 1 is carried on the {4, 5} th subcarriers, the DMRS group 2 is carried on the {6, 7} th subcarriers, the DMRS group 3 is carried on the {10, 11} th subcarriers, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted in the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 10} th OFDM symbols, wherein the {0, 1, 3, 4} sub-carriers carry DMRS group 0, the {7, 8, 10, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 10} th OFDM symbols, wherein the DMRS group 0 is carried on the {0, 1} sub-carriers, the DMRS group 1 is carried on the {3, 4} sub-carriers, the DMRS group 2 is carried on the {7, 8} sub-carriers, the DMRS group 3 is carried on the {10, 11} sub-carriers, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted in the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2, 6} th OFDM symbol and the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {5, 10} th OFDM symbol, wherein the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups; or,

the open-loop DMRS is carried on the 0 th, 1, 3, 4, 6, 7, 9, 10 th sub-carrier of the 2 th OFDM symbol and on the 1 st, 2, 4, 5, 7, 8, 10, 11 th sub-carrier of the 5 th, 10 th OFDM symbol, wherein the 0 th, 1 th sub-carrier on the 2 th OFDM symbol and the 1 st, 2 th sub-carrier on the 5 th OFDM symbol carry DMRS group 0, the 3 rd, 4 th sub-carrier on the 2 th OFDM symbol and the 4 th, 5 th sub-carrier on the 5 th OFDM symbol carry DMRS group 1, the 6 th, 7 th sub-carrier on the 2 th OFDM symbol and the 7 th, 8 th sub-carrier on the 5 th OFDM symbol carry DMRS group 2, the 9 th, 10 th sub-carrier on the 2 th OFDM symbol and the 10 th sub-carrier on the 5 th OFDM symbol, DMRS group 3 is carried on 11} subcarriers, DMRS group 4 is carried on {0, 1} th subcarrier on {6} th OFDM symbol and {1, 2} th subcarrier on {10} th OFDM symbol, DMRS group 4 is carried on {3, 4} th subcarrier on {6} th OFDM symbol and {4, 5} th subcarrier on {4, 5} th OFDM symbol, DMRS group 5 is carried on {6, 7} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {7, 8} th subcarrier on {10} th OFDM symbol, DMRS group 6 is carried on {9, 10} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {10, 11} th subcarrier on {10} th OFDM symbol, the same precoding or beamforming weights are used within each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

21. The method of claim 19 or 20,

multiplexing different DMRS ports in an FDM and/or frequency-domain CDM manner in each DMRS group, and when two DMRS ports are contained in each DMRS group, multiplexing two ports on two pilot resource elements of adjacent subcarriers located on {2} and/or {5} and/or {6} and/or {10} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group comprises more than two DMRS ports, the walsh codes are adopted to multiplex four adjacent pilot resource elements of the same DMRS group on the same OFDM symbol on {2} and/or {5} and/or {6} and/or {10} OFDM symbols, wherein the four adjacent pilot resource elements are more than two ports; walsh codes employ [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

22. The method of claim 1,

the open-loop DMRS is carried on the {2, 5, 6, 9} th OFDM symbol.

23. The method of claim 22,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol of OFDM, wherein the {0, 1, 4, 5} th subcarriers carry DMRS group 0, the {6, 7, 10, 11} th subcarriers carry DMRS group 1, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 4, 5, 6, 7, 10, 11} th subcarriers of {2, 5, 6, 9} th OFDM symbol of OFDM, wherein the DMRS group 0 is carried on the {0, 1} th subcarrier, the DMRS group 1 is carried on the {4, 5} th subcarrier, the DMRS group 2 is carried on the {6, 7} th subcarrier, the DMRS group 3 is carried on the {10, 11} th subcarrier, the same precoding or beamforming weight is adopted in each DMRS group, and the same or different precoding or beamforming weight is adopted in the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 9} th OFDM symbols, wherein the {0, 1, 3, 4} sub-carriers carry DMRS group 0, the {7, 8, 10, 11} sub-carriers carry DMRS group 1, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted among the DMRS groups; or,

the open-loop DMRS is carried on {0, 1, 3, 4, 7, 8, 10, 11} sub-carriers of {2, 5, 6, 9} th OFDM symbols, wherein the DMRS group 0 is carried on the {0, 1} sub-carriers, the DMRS group 1 is carried on the {3, 4} sub-carriers, the DMRS group 2 is carried on the {7, 8} sub-carriers, the DMRS group 3 is carried on the {10, 11} sub-carriers, the same precoding or beamforming weights are adopted in each DMRS group, and the same or different precoding or beamforming weights are adopted in the DMRS groups; or,

the open-loop DMRS is carried on the {0, 1, 3, 4, 6, 7, 9, 10} th subcarrier of the {2, 6} th OFDM symbol and the {1, 2, 4, 5, 7, 8, 10, 11} th subcarrier of the {5, 9} th OFDM symbol, wherein the {0, 1, 2, 3, 4, 5} th subcarrier carries DMRS group 0, and the {6, 7, 8, 9, 10, 11} th subcarrier carries DMRS group 1, the same precoding or beamforming weight is used in each DMRS group, and the same or different precoding or beamforming weights are used in the DMRS groups; or,

the open-loop DMRS is carried on the 0 th, 1, 3, 4, 6, 7, 9, 10 th sub-carrier of the 2 th OFDM symbol and on the 1 st, 2, 4, 5, 7, 8, 10, 11 th sub-carrier of the 5 th, 9 th OFDM symbol, wherein the 0 th, 1 th sub-carrier on the 2 th OFDM symbol and the 1 st, 2 th sub-carrier on the 5 th OFDM symbol carry DMRS group 0, the 3 rd, 4 th sub-carrier on the 2 th OFDM symbol and the 4 th, 5 th sub-carrier on the 5 th OFDM symbol carry DMRS group 1, the 6 th, 7 th sub-carrier on the 2 th OFDM symbol and the 7 th, 8 th sub-carrier on the 5 th OFDM symbol carry DMRS group 2, the 9 th, 10 th sub-carrier on the 2 th OFDM symbol and the 10 th sub-carrier on the 5 th OFDM symbol, DMRS group 3 is carried on 11} subcarriers, DMRS group 4 is carried on {0, 1} th subcarrier on {6} th OFDM symbol and {1, 2} th subcarrier on {9} th OFDM symbol, DMRS group 4 is carried on {3, 4} th subcarrier on {6} th OFDM symbol and {4, 5} th subcarrier on {4, 5} th OFDM symbol, DMRS group 5 is carried on {6, 7} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {7, 8} th subcarrier on {9} th OFDM symbol, DMRS group 6 is carried on {9, 10} th subcarrier on {6} th OFDM symbol and DMRS group 7 is carried on {10, 11} th subcarrier on {9} th OFDM symbol, the same precoding or beamforming weights are used within each DMRS group, and the same or different precoding or beamforming weights are used between DMRS groups.

24. The method of claim 22 or 23,

multiplexing different DMRS ports in an FDM and/or frequency-domain CDM manner in each DMRS group, and when two DMRS ports are contained in each DMRS group, multiplexing two ports on two pilot resource elements of adjacent subcarriers located on {2} and/or {5} and/or {6} and/or {9} OFDM symbols by using a walsh code, wherein the walsh code uses [1, 1], [1, -1 ]; when each DMRS group comprises more than two DMRS ports, the walsh codes are adopted to multiplex four adjacent pilot resource elements of the same DMRS group on the same OFDM symbol on {2} and/or {5} and/or {6} and/or {9} OFDM symbols, wherein the four adjacent pilot resource elements are more than two ports; walsh codes employ [1, 1, 1, 1], [1, 1, -1, -1], [1, -1, 1, -1], [1, -1, -1, 1 ].

25. A reference signal processing system of an open-loop MIMO system is characterized by comprising an open-loop DMRS multiplexing unit and a weighting processing unit; wherein,

the open-loop DMRS multiplexing unit is used for multiplexing different groups of open-loop DMRSs on one or more OFDM symbols in 2 nd, 3 rd, 5 th, 6 th, 9 th and 10 th OFDM symbols by using CDM and/or TDM and/or FDM technology in a special subframe;

and the weighting processing unit is used for performing corresponding weighting processing by using the same or different weights for different groups of open-loop DMRSs.

26. The system of claim 25,

the OFDM symbol carrying the open-loop DMRS is a {2, 3, 9, 10} th OFDM symbol; or,

the OFDM symbols carrying the open-loop DMRS are {2, 3} th OFDM symbols and {5, 6} th OFDM symbols; or,

the open-loop DMRS is carried on the {2, 6} th OFDM symbol; or,

the open-loop DMRS is carried on {2, 5, 6, 10} th OFDM symbol; or,

the open-loop DMRS is carried on the {2, 5, 6, 9} th OFDM symbol.

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