WO2015062069A1

WO2015062069A1 - Method for determining precoding matrix indication, receiving device, and sending device

Info

Publication number: WO2015062069A1
Application number: PCT/CN2013/086414
Authority: WO
Inventors: 刘建琴
Original assignee: 华为技术有限公司
Priority date: 2013-11-01
Filing date: 2013-11-01
Publication date: 2015-05-07
Also published as: CN104782070B; CN104782070A

Abstract

Embodiments of the present invention provide a method for determining a precoding matrix indication, a receiving device, and a sending device. The method for determining a precoding matrix indication comprises: a receiving device selecting a precoding matrix W from a codebook according to a reference signal sent by a sending device, the precoding matrix W being a product or a direct product a first codebook W1 and a second codebook W2, and a rank (W1) of the first codebook W1 being greater than or equal to a rank (W2) of the second codebook W2; and the receiving device sending channel sate indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information. The method for determining a precoding matrix indication, the receiving device and the sending device in the embodiments of the present invention can improve the precision of precoding, thereby improving the throughput of a system.

Description

Method for determining precoding matrix indication, receiving device and transmitting device

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, a receiving device, and a sending device for determining a precoding matrix indication. Background technique

In a wireless communication network, diversity and array gain can be obtained by a multiple input multiple output (MIMO) wireless communication system through a transmit precoding technique and a receive combining technique. Systems that use precoding can be expressed as

y = HVs + N

Where y is the received signal vector, H is the channel matrix, is the precoding matrix, s is the transmitted symbol vector, and N is the measurement noise.

Optimal precoding usually requires the transmitter to fully know the Channel State Information (CSI). A commonly used method is that the user equipment (UE) quantizes and reports the instantaneous CSI to the base station. Generally, the receiving device (for example, the UE) can receive the signal vector y based on the reference signal sent by the sending device (for example, the base station), and Based on the known pre-defined transmitted pilot signal s, ie the transmitted symbol vector s, and the measured noise N, also known as Gaussian white noise, the estimated channel matrix H is obtained according to the formula: y = H _{s +} n And selecting a precoding matrix that best matches the channel matrix H from the codebook, so that the channel transmission quality and rate when the data is actually transmitted is higher.

The user equipment includes a mobile station (MS), a relay, a mobile telephone, a handset, and a portable device. The base station includes a Node B (NodeB) base station (Base station). , BS), Access Point, Transmission Point (TP), Evolved Node B (eNB) or Relay (Relay). The CSI information reported by the existing Long Term Evolution (LTE) system includes a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI) information. , where RI and PMI indicate the number of transport layers used and Encoding matrix. The precoding matrix indicates the correspondence between the PMI and the precoding matrix. For details, refer to the 3rd Generation Partnership Project (3GPP) TS 36.213, the precoding matrix and the codebook table of each complex value component. One of the indicator numbers (precoding matrix indicates PMI) corresponds. A set of precoding matrices used is generally referred to as a codebook, where each precoding matrix is a codeword in a codebook.

FIG. 1 is a schematic structural view of a one-dimensional linear array antenna. The distribution of the linear array antenna shown in FIG. 1 includes only one direction, which is generally referred to as a horizontal direction. 2 is a schematic structural view of a two-dimensional array antenna. As shown in FIG. 2, the distribution of the two-dimensional array antenna includes two directions of horizontal direction and vertical direction. When the antenna size is extended from a one-dimensional line array to a horizontal and vertical two-dimensional area array, the codebook needs to be designed as a horizontal, vertical combined three-dimensional (3D) codebook W. One of the 3D codebooks W is in the form of a direct product of the horizontal codebook W1 and the vertical codebook W2, BP : W = W\ ® W2 , or a product of the first codebook W1 and the second codebook W2, g卩: W = WlxW2, _{_{wherein, Wl = W al ® W el}} , W2 = W a2 ®W e2, W al constituting level codebook to W1, W _el constituting W1 perpendicular to the codebook, W _a2 constituting W2 The horizontal direction codebook, W _e2 is the vertical codebook constituting W2. . However, how to determine the order of the first codebook W1 and the second codebook W2, respectively, so that the 3D codebook accurately simulates the characteristics of the two-dimensional array antenna. gP, the existing method for determining the 3D codebook of the two-dimensional area array antenna has lower precision, resulting in a large performance loss and a lower system throughput. Summary of the invention

The embodiment of the present invention provides a method for determining a precoding matrix indication, a receiving device, and a transmitting device, to overcome the prior art method for determining a 3D codebook of a two-dimensional area array antenna, which has low precision, and thus has low precoding precision. The problem.

In a first aspect, an embodiment of the present invention provides a method for determining a precoding matrix indication, including: a receiving device, according to a reference signal sent by a sending device, selecting a precoding matrix W from a codebook, where the precoding matrix W is a direct product or a product of the first codebook W1 and the second codebook W2, wherein the order Rank (Wl) of the first codebook W1 is greater than or equal to the order Rank of the second codebook W2 (W2) ;

The receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.

In a first possible implementation manner of the first aspect, the order of the second codebook W2 is Rank (W2) Is 1.

According to a first aspect or the first possible implementation of the first aspect, in a second possible implementation, the channel state indication information comprising: a first precoding matrix indicator indicator codebook W1 i _a And an indicator i _e indicated by the precoding matrix of the second codebook W2 _;

The receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information, including:

The receiving device sends the channel state indication information to the sending device, so that the sending device determines, according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order. Determining the order of the first codebook W1 and the order of the second codebook W2, and determining the precoding matrix according to the order of the first codebook W1 and the order of the second codebook W2 W.

According to the first aspect or the first possible implementation manner of the first aspect, in a third possible implementation, the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i _a And an indicator i _e indicated by the precoding matrix of the second codebook W2, a channel quality information indicator CQI, an order Rank (W1 ) of the first codebook W1, and a total order of the precoding matrix W; The receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information, including:

Sending, by the receiving device, the channel state indication information to the sending device, so that the sending device determines, according to the order of the first codebook W1, Rank (W1), and the total order of the precoding matrix W. The order of the second codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.

According to a third possible implementation manner of the first aspect, in a fourth possible implementation, before the receiving device sends the channel state indication information to the sending device, the method includes:

The receiving device jointly encodes the indicator i _a indicated by the precoding matrix corresponding to the first codebook with the order Rank (W1 ) of the first codebook W1, and the second codebook W2 The indicator i _e indicated by the precoding matrix is jointly encoded with the CQI.

According to the first aspect or the first possible implementation manner of the first aspect, in a fifth possible implementation, the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i _a An indicator i _e indicated by the precoding matrix of the second codebook W2, the CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;

The receiving device sends channel state indication information to the sending device, so that the sending device Determining the precoding matrix w according to the channel state indication information, including: the receiving device sending the channel state indication information to the sending device, so that the sending device is configured according to the second codebook W2 The order Rank (W2) and the total order of the precoding matrix W determine the order Rank(W1) of the first codebook W1, and according to the order of the first codebook W1 and the second The order of the codebook W2 determines the precoding matrix W.

According to the fifth possible implementation manner of the first aspect, in a sixth possible implementation, before the receiving device sends the channel state indication information to the sending device, the method includes:

The receiving device jointly encodes the indicator i _e indicated by the precoding matrix corresponding to the second codebook with the order Rank (W2 ) of the second codebook W2, and the first codebook W1 is The indicator i _a indicated by the precoding matrix is jointly encoded with the CQI.

According to the first aspect or the first possible implementation of the first aspect, in a seventh possible implementation,

The channel state indication information includes: a quantized value of a combination of an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;

The receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 The combined quantized value of (W2) determines the order Rank (Wl) of the first codebook W1 and the order Rank (W2) of the second codebook W2, and according to the order of the first codebook W1 The number and the order of the second codebook W2 determine the precoding matrix W.

According to the seventh possible implementation manner of the first aspect, in the eighth possible implementation, the channel state indication information further includes: a total order of the precoding matrix W;

The receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 The combined quantized value of (W2) determines the order Rank of the first codebook W1 (Wl) and the order of the second codebook W2, including:

The receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 The combined value of (W2) and the total order of the precoding matrix W determine the first code The order of the W1 Rank (Wl) and the order of the second codebook W2.

According to the first aspect or the first possible implementation of the first aspect, in a ninth possible implementation,

The channel state indication information includes: an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;

The receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix w according to the order of the first codebook W1 and the order of the second codebook W2. .

According to the first aspect or the first possible implementation of the first aspect, in a tenth possible implementation,

The channel state indication information includes: a total order of the precoding matrix w. ;

The receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the indication information, including:

The receiving device sends the channel state indication information to the sending device, so that the sending device determines the first codebook according to a total order of the precoding matrix w and antenna configuration information of the sending device. The order Rank of the W1, Rank (W1), and the order of the second codebook W2, Rank (W2), and determine the number according to the order of the first codebook W1 and the order of the second codebook W2. The precoding matrix W, wherein the antenna configuration information of the transmitting device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.

According to the first aspect, any one of the first to the tenth possible implementation manners of the first aspect, in the eleventh possible implementation manner, the first codebook W1 and the second code The W2 is selected from the 2-antenna codebook, the 4-antenna codebook, or the 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.

In a second aspect, an embodiment of the present invention provides a method for determining a precoding matrix indication, including: sending, by a sending device, a reference signal to a receiving device;

Receiving, by the sending device, channel state indication information sent by the receiving device;

Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, where the precoding matrix W is a product or a direct product of two matrices W1 and W2 , The order Rank (W1 ) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.

In a first possible implementation of the second aspect, the second rank W2 has a rank Rank (W2) of 1.

According to a second aspect, the first possible implementation of the second aspect, in a second possible implementation, the channel state indication information comprising: a first precoding matrix indicator indicator codebook W1 i _a And an indicator i _e indicated by the precoding matrix of the second codebook W2 _;

Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, including:

Determining, by the sending device, the order of the first codebook W1 and the order of the second codebook W2 according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order Number

The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.

According to the second aspect or the first possible implementation of the second aspect, in a third possible implementation manner,

The channel state indication information includes: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, a channel quality information indicator CQI, the foregoing An order Rank of a codebook W1 (W1) and a total order of the precoding matrix W;

The transmitting device determines the order Rank (W2) of the second codebook W2 according to the order Rank (W1) of the first codebook W1 and the total order of the precoding matrix W;

According to the second aspect or the first possible implementation of the second aspect, in a fourth possible implementation,

The channel state indication information includes: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, the CQI, and the second codebook The order Rank of W2 (W2) and the total order of the precoding matrix W; Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, including:

The transmitting device determines the order Rank (W1) of the first codebook W1 according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W;

According to the second aspect or the first possible implementation of the second aspect, in a fifth possible implementation,

The channel state indication information includes: a quantized value of a combination of an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;

The transmitting device determines the order of the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 Rank (W1) and the order of the second codebook W2 Rank (W2);

According to a fifth possible implementation manner of the second aspect, in a sixth possible implementation, the channel state indication information further includes: a total order of the precoding matrix W;

The transmitting device determines the order of the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 Rank (W1) and the order Rank (W2) of the second codebook W2, including:

The transmitting device is based on a combination of the quantization value of the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) and the total order of the precoding matrix W Determining the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) o

According to the second aspect or the first possible implementation of the second aspect, in a seventh possible implementation,

The channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2; Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, including:

According to the second aspect or the first possible implementation of the second aspect, in an eighth possible implementation,

The channel state indication information includes: a total order of the precoding matrix W;

Determining, by the transmitting device, the order Rank (W1) of the first codebook W1 and the order of the second codebook W2 according to a total order of the precoding matrix W and antenna configuration information of the transmitting device Rank (W2) o, wherein the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;

According to the second aspect, any one of the first to the eighth possible implementation manners of the second aspect, in the ninth possible implementation manner, the first codebook W1 and the second codebook W2 is selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.

In a third aspect, an embodiment of the present invention provides a receiving device, including:

a receiving module, configured to select a precoding matrix W from the codebook based on a reference signal sent by the sending device, where the precoding matrix W is a product or a direct product of the first codebook W1 and the second codebook W2.

The order of the first codebook W1, Rank (W1), is greater than or equal to the order of the second codebook W2 (W2);

And a sending module, configured to send channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.

In a first possible implementation of the third aspect, the second rank W2 has a rank Rank (W2) of one.

According to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the channel state indication information includes: a precoding matrix indicated by the first codebook W1 An indicator i _{a of the} indicator i _a and the precoding matrix of the second codebook W2 _;

The sending module is specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device determines the first code according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order The order of the W1 and the order of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2.

According to the third aspect or the first possible implementation manner of the third aspect, in a third possible implementation, the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i _a And an indicator i _e indicated by the precoding matrix of the second codebook W2, a channel quality information indicator CQI, an order Rank(W1) of the first codebook W1, and a total order of the precoding matrix W; The sending module is specifically configured to:

Transmitting, by the sending device, the channel state indication information, so that the sending device determines the second according to the order Rank of the first codebook W1, Rank (W1), and the total order of the precoding matrix W. The order of the codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.

According to a third possible implementation manner of the third aspect, in a fourth possible implementation manner, the method further includes:

An encoding module, configured to: before the receiving device sends the channel state indication information to the sending device, the indicator indicated by the precoding matrix corresponding to the first codebook and the order of the first codebook W1 Rank (W1) performs joint coding, and jointly encodes the indicator i _e indicated by the precoding matrix of the second codebook W2 with the CQI.

According to the third aspect or the first possible implementation manner of the third aspect, in a fifth possible implementation, the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i _a An indicator i _e indicated by the precoding matrix of the second codebook W2, the CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;

The sending module is specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device determines the first according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W The order of the codebook W1 is Rank (W1), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2. According to the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner, the method further includes:

An encoding module, configured to: before the receiving device sends the channel state indication information to the sending device, the indicator i _e indicated by the precoding matrix corresponding to the second codebook and the second codebook W2 The number Rank (W2) performs joint coding, and the indicator i _a indicated by the precoding matrix of the first codebook W1 is jointly encoded with the CQI.

According to the third aspect or the first possible implementation of the third aspect, in a seventh possible implementation,

The sending module is specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) The combined quantized value determines the order of the first codebook W1, Rank (W1), and the order of the second codebook W2, and according to the order of the first codebook W1 and the second codebook The order of W2 determines the precoding matrix W.

According to the seventh possible implementation manner of the third aspect, in the eighth possible implementation, the channel state indication information further includes: a total order of the precoding matrix w;

The sending module is specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) The combined quantized value and the total order of the precoding matrix W determine the order Rank of the first codebook W1 (W1) and the order of the second codebook W2.

According to the third aspect or the first possible implementation of the third aspect, in a ninth possible implementation manner,

The channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;

The sending module is specifically configured to:

And transmitting the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2. According to the third aspect or the first possible implementation manner of the third aspect, in a tenth possible implementation manner,

The sending module is specifically configured to:

Sending the channel state indication information to the sending device, so that the sending device determines the order of the first codebook W1 according to the total order of the precoding matrix W and the antenna configuration information of the sending device. Rank (W1) and the order Rank of the second codebook W2, Rank (W2), and determining the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2 The antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.

According to the third aspect, any one of the first to the tenth possible implementation manners of the third aspect, in the eleventh possible implementation manner, the first codebook W1 and the second code The W2 is selected from the 2-antenna codebook, the 4-antenna codebook, or the 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.

In a fourth aspect, an embodiment of the present invention provides a sending device, including:

a sending module, configured to send a reference signal to the receiving device;

a receiving module, configured to receive channel state indication information sent by the receiving device;

a processing module, configured to determine, according to the channel state indication information, a precoding matrix W selected by the receiving device from a codebook based on a reference signal, where the precoding matrix W is a product or a straight line of two matrices W1 and W2 Product,

The order of the first codebook W1, Rank (W1), is greater than or equal to the second codebook.

The rank of W2 Rank (W2).

In a first possible implementation of the fourth aspect, the second rank W2 has a rank Rank (W2) of 1.

According to a fourth aspect or the second possible implementation of the fourth aspect, in a second possible implementation, the channel state indication information comprising: a first precoding matrix indicator indicator codebook W1 i _a And an indicator i _e indicated by the precoding matrix of the second codebook W2 _;

The processing module is specifically configured to:

Determining the order of the first codebook W1 and the order of the second codebook W2 according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order;

Determining the receiving according to the order of the first codebook W1 and the order of the second codebook W2 The device is based on the precoding matrix w selected from the codebook based on the reference signal.

According to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a third possible implementation, the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i _a And an indicator i _e indicated by the precoding matrix of the second codebook W2, a channel quality information indicator CQI, an order Rank (W1) of the first codebook W1, and a total order of the precoding matrix W; The processing module is specifically configured to:

Determining the order Rank (W2) of the second codebook W2 according to the order of the first codebook W1 (W1) and the total order of the precoding matrix W;

The precoding matrix w selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.

According to the fourth aspect or the first possible implementation manner of the fourth aspect, in a fourth possible implementation, the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i _a An indicator i _e indicated by the precoding matrix of the second codebook W2, the CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;

The processing module is specifically configured to:

Determining the order Rank (W1) of the first codebook W1 according to the order of the second codebook W2 (W2) and the total order of the precoding matrix W;

Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.

According to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a fifth possible implementation, the channel state indication information includes: an order Rank (Wl) of the first codebook W1 and a combined quantized value of the order Rank (W2) of the second codebook W2;

The processing module is specifically configured to:

Determining the order Rank (W1) of the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 And an order Rank of the second codebook W2 (W2);

According to the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation, the channel state indication information further includes: a total order of the precoding matrix W; The processing module is specifically configured to:

Determining the number according to a combination of the quantized value of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) and the total order of the precoding matrix W The order Rank of one codebook W1 (W1) and the order of the second codebook W2.

According to the fourth aspect or the first possible implementation manner of the fourth aspect, in a seventh possible implementation, the channel state indication information includes: an order Rank (Wl) of the first codebook W1 and The order of the second codebook W2 Rank (W2) _;

The processing module is specifically configured to:

According to the fourth aspect, or the first possible implementation manner of the fourth aspect, in the eighth possible implementation manner, the channel state indication information includes: a total order of the precoding matrix w;

The processing module is specifically configured to:

Determining, according to a total order of the precoding matrix w and antenna configuration information of the transmitting device, an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2. . The antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;

According to the fourth aspect, any one of the first to the eighth possible implementation manners of the fourth aspect, in the ninth possible implementation manner, the first codebook W1 and the second codebook W2 is selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.

The method for determining the precoding matrix indication, the receiving device, and the sending device provided by the embodiment of the present invention, the order of the first codebook W1 being greater than or equal to the order of the second codebook can ensure that the order of the final precoding matrix W is Very good approximation and simulation. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of precoding, thereby reducing performance loss and improving system throughput. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will be true. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are required to be used in the description of the prior art, are briefly described. It is obvious that the drawings in the following description are some embodiments of the present invention, and no one would be creative to those skilled in the art Other drawings can also be obtained from these drawings on the premise of labor.

1 is a schematic structural view of a one-dimensional linear array antenna;

2 is a schematic structural view of a two-dimensional array antenna;

3 is a flowchart of Embodiment 1 of a method for determining a precoding matrix indication according to the present invention;

4 is a flowchart of Embodiment 2 of a method for determining a precoding matrix indication according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 1 of a receiving device according to the present invention;

6 is a schematic structural diagram of Embodiment 2 of a receiving device according to the present invention;

7 is a schematic structural diagram of Embodiment 1 of a transmitting device according to the present invention;

8 is a schematic structural diagram of hardware of Embodiment 3 of a receiving device according to the present invention;

9 is a schematic structural diagram of hardware of a second embodiment of a transmitting device according to the present invention;

FIG. 10 is a schematic structural diagram of an embodiment of a communication system according to the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The technical solution of the present invention can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, and wideband code division. Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (Advanced Long) Term evolution, abbreviated as: LTE-A) System, Universal Mobile Telecommunication System (UMTS), etc.

In the embodiment of the present invention, the user equipment (User Equipment, UE for short) includes but is not limited to a mobile station (Mobile Station, MS for short), a relay (Relay), and a mobile terminal (Mobile). Terminal, mobile phone, mobile device (Handset) and portable device (Portable Equipment), etc., the user equipment can communicate with one or more core networks via a radio access network (Radio Access Network, RAN) For example, the user device may be a mobile phone (or "cellular" phone), a computer with wireless communication capabilities, etc., and the user device may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.

In the embodiment of the present invention, the base station may be a base station (Base Transceiver Station, BTS for short) in GSM or CDMA, or a base station (NodeB, NB for short) in WCDMA, or an evolved base station in LTE. (Evolutional Node B, abbreviated as: eNB or e-NodeB), or relay, etc., the present invention is not limited.

A multi-antenna system refers to a system in which a transmitting device and a receiving device communicate through a plurality of antennas. Wherein, when the sending device is a base station, the receiving device is a UE; otherwise, when the sending device is a UE, the receiving device is a base station. Compared with a single antenna system, multiple antennas of the transmitting device and the receiving device can form a spatial diversity gain or a multiplexing gain, which can effectively improve transmission reliability and system capacity. The diversity gain and multiplexing gain in a multi-antenna system can generally be obtained by a precoding method of the transmitting device and a receiving combining algorithm of the receiving device.

The multi-antenna system of the embodiment of the present invention can be applied to a single-point transmission scenario, that is, a transmission scenario of a transmitting device and a receiving device. It can also be applied to the scenario of multi-point joint transmission. Multi-point joint transmission refers to the joint transmission of signals by multiple transmitting devices to the same receiving device. For example, transmitting device A has 2 antennas, and transmitting device B also has 2 antennas, two The transmitting devices simultaneously perform joint transmission on the receiving device. Then the signal received by the receiving device can be regarded as a signal transmitted by a 4-antenna base station.

FIG. 3 is a flowchart of Embodiment 1 of a method for determining a precoding matrix indication according to the present invention. The executor of this embodiment is a receiving device, which may be a base station or a UE. When the performing host receiving device is a base station, the sending device may be a UE. When the performing host receiving device is a UE, the sending device may be a base station. As shown in FIG. 3, the method in this embodiment may include:

Step 301: The receiving device selects a precoding matrix W from the codebook according to the reference signal sent by the sending device, where the precoding matrix W is a direct product or a product of the first codebook W1 and the second codebook W2. The order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.

Specifically, the first codebook W1 may be a codebook representing a horizontal antenna, and the second code This W2 can be a codebook representing a vertical antenna.

This is because, considering that the vertical angle expansion is generally around 2-4 degrees, and the horizontal angle is extended by about 8-15 degrees, it means that the horizontally distinguishable diameter is more, and the characteristics of the multilayer transmission are easier. Supported, therefore, when the first codebook W1 and the second codebook W2 are selected, the first codebook W1 representing the horizontal direction can be selected as the codebook with higher order, and the second codebook W2 representing the vertical direction can be selected. It is a codebook with a lower order. Specifically, it is assumed that the 3D codebook to be constructed, that is, the precoding matrix W, has an order of R, the order of the first codebook W1 is s, and the order of the second codebook W2 is t, and s≥t is defined. . For example, the 3D codebook of order 6 is W, W is the product or direct product of W1 and W2, and the selection scheme of W1 and W2 can be: Rank (W1) = 3, Rank (W2) = 2, or, can be Rank (W1) = 6, Rank (W2) =1.

Further, the first codebook W1 and the second codebook W2 are respectively selected from a 2-antenna codebook, a 4-antenna codebook or an 8-antenna codebook of the Long Term Evolution (LTE) system.

The matrix W1 may be a matrix representing broadband channel characteristics, and the matrix W2 may be a matrix representing channel characteristics of subbands; or, the matrix W1 may be a matrix representing long-term channel characteristics, and the matrix W2 may be a matrix representing short-term channel characteristics. .

For example, in the 6th order codebook based on the direct product form of the Rel-10 dual codebook structure, the first codebook W1 may be a 3rd order Rel-10 codebook, and the second codebook W2 may be a 2nd order Rel-10 codebook. this.

Further, in this implementation, in the specific implementation, the order Rank (W1) of the second codebook W2 may also be limited to 1. That is, the 3D codebook of any order (set to R order) can be generated by a direct product of the second codebook W2 perpendicular to the 1st order and the first codebook W1 codebook of the horizontal R order.

Step 302: The receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.

Correspondingly, the sending device may obtain the precoding matrix W of the antenna array of the receiving device according to the relationship between the PMI and the precoding matrix specified in the 3GPP according to the track state indication information.

It should be noted that the type of the reference signal in 301 is not limited in the embodiment of the present invention. For example, it may be a Channel State Information Reference Signal (CSI RS), a Demodulation Reference Signal (Demodulation RS, DM RS), or a Cell-Specific RS (CRS). The CSI may also include Channel Quality Indicator/Index (CQI). It should also be noted that the UE may receive a base station notification (for example, Radio Resource Control (RRC) signaling or downlink control. Downlink Control Information (DCI) or resource configuration of the reference signal based on the cell identifier ID and obtain a reference signal in the corresponding resource or subframe.

In this embodiment, when the receiving device selects the precoding matrix W from the codebook based on the reference signal sent by the transmitting device, the W passes the product of the first codebook W1 and the second codebook W2 or Constructed to be able to represent the characteristics of the three-dimensional beam vector in the codebook, so the constructed precoding matrix W can be used as a 3-dimensional (3D) codebook; and by defining the order Rank of the first codebook W1 (W1) is greater than or equal to the order Rank (W2) of the second codebook W2 such that the constructed 3D codebook W conforms to the characteristic that the antenna is less than the horizontal expansion angle at the vertical expansion angle, and therefore, the constructed 3D The accuracy of the codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of the precoding, thereby reducing performance loss and improving the system. Throughput.

In the foregoing embodiment, in a specific implementation, specifically, in step 302, after the receiving device determines the 3D codebook W, the receiving device feeds back the channel state indication information to the sending device, so that the sending device determines the location according to the channel state indication information. The process of describing the 3D codebook W can be implemented in the following six ways.

In a first implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix of the first codebook W1 and an indicator i _e indicated by a precoding matrix of the second codebook W2 _;

The step 302 may be specifically: the receiving device sends the channel state indication information to the sending device, so that the sending device indicates the indicator and the codebook level according to a preset rule or a preset precoding matrix. The mapping relationship of the number determines the order of the first codebook W1 and the order of the second codebook W2, respectively, and according to the order of the first codebook W1 and the order of the second codebook W2 The number determines the precoding matrix W.

In this implementation manner, the sending device and the receiving device need to agree on a preset rule in advance, or pre-agreed the mapping relationship between the indicator indicated by the precoding matrix and the codebook order. Therefore, when the receiving device feeds back the channel state indication information, The order of the first codebook W1 and the second codebook W2 may not be directly fed back, but only the indicator i _a of the precoding matrix indication of the first codebook W1 and the precoding matrix indication of the second codebook W2 may be fed back. The indicator i _e may be, after the receiving device receives the ^ and i _e , the order of the first codebook W1 and the second codebook W2 may be implicitly obtained, so that the receiving device does not increase the transmission to the transmitting device. The number of bits of the channel status indication information. Here, one of the possible mapping relationships may be as follows: The indicator indicated by the precoding matrix may be the indicator i after all the codebooks concatenated, for example, the codebook indicator of order 1 is 0 to Il-1 , the codebook indicator of order 2 is il-1 to il+i2-2, where il is the number of codebooks of order 1, i2 is the number of codebooks of order 2, and so on. Obtaining the codebook number of the codebooks of all orders, and then establishing a mapping relationship between the horizontal codebook indicator and the corresponding order, as shown in Table 1, and the vertical codebook indicator and the corresponding order The mapping relationship is shown in Table 2.

In a second implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;

Step 302 may specifically be:

The receiving device sends the channel state indication information to the sending device, so that the sending device determines, according to the order Rank of the first codebook W1, Rank (W1), and the total order of the precoding matrix W. The order of the second codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2. Specifically, Rank (W2) = the total order of the precoding matrix W, Rank (W) / Rank (Wl). In this manner, before the receiving device sends the channel state indication information to the sending device, the method may include:

In a third implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;

Step 302 may specifically be:

The receiving device sends the channel state indication information to the sending device, so that the sending device determines, according to the order Rank of the second codebook W2, Rank (W2) and the total order of the precoding matrix W. The order of the first codebook W1 is Rank (W1), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.

In a specific implementation, before the receiving device sends the channel state indication information to the sending device, the method may include:

In a fourth implementation manner, the channel state indication information may include: a combination of the order of the first codebook W1, Rank (W1), and the order of the second codebook, W2, Rank (W2) value.

For example, a combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2, Rank (W2) may be represented by various quantized values, for example, for a total order of 6. 3D codebook, set the first combination as: Rank (Wl) = 3, Rank (W2) = 2, quantize the first group to 1; set the second combination as: Rank (Wl) = 6, Rank (W2) =1, the second group is quantized to 2, and therefore, when the first combination is employed, the channel state indication information is: a quantization value of 1 and a total order of 6 of the precoding matrix W. Correspondingly, when receiving the channel state indication information, the sending device may determine Rank (Wl) = 3, Rank (W2) = 2 according to the quantized value 1, thereby Determine the precoding matrix \¥.

In this manner, step 302 may specifically be:

The receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2, Rank The combined quantized value of (W2) determines the order Rank of the first codebook W1 (W1) and the order of the second codebook W2, and according to the order of the first codebook W1 and the The order of the second codebook W2 determines the precoding matrix W.

Further, the channel state indication information may be in addition to the quantized value including the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. The method includes: a total order of the precoding matrix W. The first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2 The correctness of the order Rank of the W1 (W1) and the order of the second codebook W2, Rank (W2).

In a fifth implementation manner, the channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2.

In this manner, the receiving device does not feed back the total order of the precoding matrix W, and directly feeds back the order Rank (W1) of the first codebook W1 and the order Rank (Wl) of the second codebook W2, The transmitting device receives the channel state indication information, and obtains the total order of the precoding matrix W according to Rank (Wl) XRank (Wl).

In this manner, step 302 may specifically be:

In a sixth implementation manner, the channel state indication information may include: a total order of the precoding matrix W.

Step 302 may specifically be:

The receiving device sends the channel state indication information to the sending device, so that the sending device determines the first codebook according to a total order of the precoding matrix W and antenna configuration information of the sending device. The order Rank of the W1, Rank (W1), and the order of the second codebook W2, Rank (W2), and determine the number according to the order of the first codebook W1 and the order of the second codebook W2. Precoding Matrix w. The antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type. The number of the first antenna ports refers to the number of horizontal antenna ports of the transmitting device, and the number of the second antenna ports refers to the number of vertical antenna ports of the transmitting device.

A person skilled in the art can understand that the antenna configuration information of the receiving device can be sent to the sending device before step 302 or simultaneously with step 302, so that the sending device can be based on the horizontal antenna port number and the vertical antenna of the transmitting device. The number of ports determines the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. For example, when the total order of the precoding matrix W is 4, and the number of horizontal antenna ports is 4, the number of vertical antenna ports is 2, and the antenna polarization type is cross polarization, because of the cross antenna of the 2 antenna ports The order is usually 1, so the default first codebook W1 has an order of 4, and the second codebook W2 has an order of 1. The foregoing six receiving devices send channel state indication information to the sending device, so that the sending device determines any one of the manners of the precoding matrix w according to the indication information, and feeds back the first codebook W1. The number of bits may be the same as the number of feedback bits of the horizontal codebook of the same number of antenna ports in Rel-8, Rel-9 or Rel-10, or may be larger than the same antenna port in Rel-8, Rel-9 or Rel-10 The number of feedback bits of the codebook is not limited here. The number of bits required to feed back the second codebook W2 may be the same as the number of feedback bits of the codebook of the same number of antenna ports in Rel-8, Rel-9 or Rel-10, or may be greater than Rel-8, Rel-9 or Rel The number of feedback bits of the codebook of the same number of antenna ports in the -10 is not limited herein.

However, it can be seen that, in the above six manners, the receiving device feeds back to the transmitting device the order of the first codebook W1 constituting the 3D codebook and the second codebook W2 without increasing the number of feedback bits. The order is such that the transmitting device obtains the first codebook W1 and the second codebook W2, thereby determining the 3D codebook W by directly integrating the first codebook W1 and the second codebook W2.

FIG. 4 is a flowchart of Embodiment 2 of a method for determining a precoding matrix indication according to the present invention. The executor of this embodiment is a transmitting device, which may be a base station or a UE. When the sending device is a base station, the receiving device may be a UE. When the sending device is a UE, the receiving device may be a base station. As shown in FIG. 4, the method in this embodiment may include:

Step 401: The sending device sends a reference signal to the receiving device.

The type of the reference signal may be a Channel State Information Reference Signal (CSI RS), a Demodulation Reference Signal (Demodulation RS, DM RS ), or a Cell-Specific Reference Signal (CRS). CSI can also include Channel Quality Indicator/Index (CQI). It should be noted that the UE may obtain the resource configuration of the reference signal by receiving a base station notification, such as Radio Resource Control (RRC) signaling or Downlink Control Information (DCI) or based on the cell identifier ID. The reference signal is obtained in the corresponding resource or the subframe, which is not limited by the embodiment of the present invention.

Step 402: The sending device receives channel state indication information sent by the receiving device. Step 403: The sending device determines, according to the channel state indication information, a precoding matrix W selected by the receiving device from a codebook based on a reference signal, where the precoding matrix W is a product of two matrices W1 and W2. Or direct product, wherein the order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.

Specifically, the first codebook W1 may be a codebook that represents a horizontal antenna, and the second codebook W2 may be a codebook that represents a vertical antenna.

This is because, considering that the vertical angle expansion is generally around 2-4 degrees, and the horizontal angle is extended by about 8-15 degrees, it means that the horizontally distinguishable diameter is more, and the characteristics of the multilayer transmission are easier. Supported, therefore, when the first codebook W1 and the second codebook W2 are selected, the first codebook W1 representing the horizontal direction can be selected as the codebook with higher order, and the second codebook W2 representing the vertical direction can be selected. It is a codebook with a lower order. Specifically, it is assumed that the 3D codebook to be constructed, that is, the order of the precoding matrix W is R, the order of the first codebook W1 is s, and the order of the second codebook W2 is t, then s≥t is defined. For example, the 3D codebook of order 6 is W, W is the direct product of W1 and W2, and the selection scheme of W1 and W2 can be: Rank (W1) = 3, Rank (W2) = 2, or, can be Rank (Wl ) =6, Rank (W2) =1.

Further, in this implementation, in the specific implementation, the order Rank (W2) of the second codebook W2 may be limited to 1. That is, the 3D codebook of any order (set to R order) can be vertically oriented The second codebook W2 of the 1st order and the direct product of the first codebook W1 codebook whose horizontal direction is the Rth order are generated.

In step 403, specifically, the sending device may obtain a precoding matrix \¥ of the antenna array of the receiving device according to the relationship between the PMI and the precoding matrix specified in the 3GPP according to the track state indication information.

In this embodiment, in step 403, the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the received channel state indication information, and the precoding matrix w selected by the transmitting device is represented by a direct product or a product of the horizontal first codebook W1 and the second codebook W2 representing the vertical direction, so that the characteristics of the three-dimensional beam vector can be expressed in the codebook, and thus the precoding matrix W can be used as a 3D code And, by defining the order Rank(W1) of the first codebook W1 to be greater than or equal to the order Rank(W2) of the second codebook W2, so that the 3D codebook W conforms to the antenna in the vertical direction. The angle is smaller than the horizontal expansion angle. Therefore, the accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively Improve the accuracy of precoding, thereby reducing performance loss and increasing system throughput.

In the above embodiment, in a specific implementation, further specifically, in step 402, the sending device receives channel state indication information sent by the receiving device, and step 403, the sending device determines, according to the channel state indication information, The precoding matrix W selected by the receiving device from the codebook based on the reference signal can be implemented in the following six manners.

In a first implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix of the first codebook W1 and an indicator i _e indicated by a precoding matrix of the second codebook W2 _; The determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, according to the channel state indication information, includes:

Step 1: The sending device determines the order of the first codebook W1 and the second codebook according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order. The order of W2;

Step 2: The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.

In this implementation manner, the sending device and the receiving device need to agree on a preset rule in advance, or pre-agreed the mapping relationship between the indicator indicated by the precoding matrix and the codebook order. Therefore, when the receiving device feeds back the channel state indication information, Can not directly feedback the first codebook W1 and the second codebook W2 The order, but only the indicator i _a of the precoding matrix indication of the first codebook W1 and the indicator i _e of the precoding matrix of the second codebook W2 need to be fed back, and the transmitting device receives the ^ and After i _e , the order of the first codebook W1 and the second codebook W2 may be implicitly obtained, so that the number of bits of the channel state indication information transmitted by the receiving device to the transmitting device is not increased.

Here, one of the possible mapping relationships may be as follows: The indicator indicated by the precoding matrix may be the indicator i after all the codebooks concatenated, for example, the codebook indicator of order 1 is 0 to Il-l, the codebook indicator of order 2 is il-1 to il+i2-2, where il is the number of codebooks of layer 1, and i2 is the number of codebooks of layer 2, and so on. The codebook number of the codebook of the order is cascaded, and then the mapping relationship between the horizontal codebook indicator and the corresponding order can be established, as shown in Table 1 above, and the vertical codebook indicator and the corresponding order The mapping relationship is as shown in Table 2 above.

In a second implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W.

Then, the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, and includes:

Step 1: The sending device determines the order Rank (W2) of the second codebook W2 according to the order Rank (Wl) of the first codebook W1 and the total order of the precoding matrix W;

And, in a specific implementation, before the receiving device sends the channel state indication information to the sending device, the method may include:

In a third implementation, the channel state indication information may include: a first code indicating a precoding matrix corresponding to the indicator of the present i _a, i _e the second indicator code indicating the precoding matrix W2 is present, the The CQI, the order Rank of the second codebook W2, Rank (W2), and the total order of the precoding matrix W.

Then, the sending device determines, according to the channel state indication information, the receiving device in step 403. The precoding matrix w selected from the codebook based on the reference signal includes:

Step 1: The transmitting device determines the order Rank (W1) of the first codebook W1 according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W;

In a fourth implementation manner, the channel state indication information may include: a combination of the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) value.

For example, the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 may be represented by various quantized values, for example, for a total order of 6. 3D codebook, set the first combination as: Rank (W1) = 3, Rank (W2) = 2, quantize the first group to 1; set the second combination to be: Rank (W1) = 6, Rank (W2) =1, the second group is quantized to 2, and therefore, when the first combination is employed, the channel state indication information is: a quantization value of 1 and a total order of 6 of the precoding matrix W. Correspondingly, when receiving the channel state indication information, the transmitting device may determine Rank (W1) = 3 and Rank (W2) = 2 according to the quantized value 1, thereby determining the precoding matrix \¥.

In this manner, the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, according to the channel state indication information, including:

Step 1: The sending device determines the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. The order Rank (W1) and the order of the second codebook W2 Rank (W2);

Further, the channel state indication information is not only the quantized value including the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2), It may also include: a total order of the precoding matrix w. The first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2 The correctness of the order Rank of the W1 (W1) and the order of the second codebook W2, Rank (W2).

In this manner, the receiving device does not feed back the total order of the precoding matrix W, but directly feeds back the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2, The transmitting device receives the channel state indication information, and obtains the total order of the precoding matrix W according to Rank (Wl) XRank (W2).

In step 403, the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, including:

Step 1: The sending device determines, according to the total order of the precoding matrix W and the antenna configuration information of the sending device, the order Rank (Wl) of the first codebook W1 and the second codebook W2. The order of Rank (W2). The antenna configuration information of the sending device includes: a first day line port number, a second antenna port number, and an antenna polarization type;

A person skilled in the art may understand that the sending device may determine the order Rank of the first codebook W1 (Wl) and the second codebook W2 according to the horizontal number of the transmitting device and the number of the vertical antenna ports. Order Rank (W2).

The foregoing six types of sending devices receive the channel state indication information sent by the receiving device, and the sending device determines any one of the manners of the precoding matrix W according to the indication information, and feeds back the first codebook W1. The number of bits can be the same as the antenna port in Rel-8, Rel-9 or Rel-10 The number of feedback bits of the codebook of the same number is the same, and may be greater than the number of feedback bits of the codebook of the same number of antenna ports in Rel-8, Rel-9, or Rel-10, which is not limited herein. The number of bits required to feed back the second codebook W2 to feed back the first codebook W1 may be the same as the number of feedback bits of the codebook of the same number of antenna ports in Rel-8, Rel-9 or Rel-10, The number of feedback bits of the codebook that can be greater than the number of the same antenna port in Rel-8, Rel-9, or Rel-10 is not limited herein.

However, it can be seen that, in the above six manners, the receiving device feeds back to the transmitting device the order of the first codebook W1 constituting the 3D codebook and the second codebook W2 without increasing the number of feedback bits. The order, whereby the transmitting device obtains the first codebook W1 and the second codebook W2, and the transmitting device determines the 3D codebook w by directly integrating the first codebook W1 and the second codebook W2.

FIG. 5 is a schematic structural diagram of Embodiment 1 of a receiving device according to the present invention. The receiving device in this embodiment may be a base station or a terminal. As shown in FIG. 5, the receiving device 500 of this embodiment may include: a receiving module 11 and a sending module 12, where

The receiving module 11 may be configured to select a precoding matrix W from the codebook based on a reference signal sent by the sending device, where the precoding matrix W is a product or a direct product of the first codebook W1 and the second codebook W2. ,

The sending module 12 may be configured to send channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.

Further, the order of the second codebook W2, Rank (W2), is 1.

The receiving device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3, and the implementation principle thereof is similar, and details are not described herein again.

The receiving device of this embodiment selects the precoding matrix W from the codebook based on the reference signal transmitted by the transmitting device, by using the first codebook W1 representing the horizontal direction and the second codebook W2 representing the vertical codebook. Constructed to be able to represent the characteristics of the three-dimensional beam vector in the codebook, so the constructed precoding matrix W can be used as a 3-dimensional (3D) codebook; and by defining the order Rank of the first codebook W1 (W1) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the constructed 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and thus, the constructed The accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the precision of the precoding, thereby reducing performance loss and improving the throughput of the system.

Further, this embodiment may also have the following six specific implementation manners.

In a first implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix of the first codebook W1 and an indicator i _e indicated by a precoding matrix of the second codebook W2 _; The sending module 12 can be specifically used to:

The sending module 12 can be specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device determines the second according to the order Rank of the first codebook W1 (W1) and the total order of the precoding matrix W. The order of the codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.

FIG. 6 is a schematic structural diagram of Embodiment 2 of a receiving device according to the present invention. The receiving device 600 of the present embodiment, based on the receiving device shown in FIG. 5, further includes: an encoding module 13 for the second specific implementation manner.

The encoding module 13 may be configured to: before the receiving device sends the channel state indication information to the sending device, the indicator indicated by the precoding matrix corresponding to the first codebook and the first codebook W1 The order Rank (W1) is jointly coded, and the indicator i _e indicated by the precoding matrix of the second codebook W2 is jointly encoded with the CQI.

In a third implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total of the precoding matrix W Order;

The sending module 12 can be specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device determines the first according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W The order of the codebook W1 is Rank (W1), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.

Further, the third implementation manner may also adopt the structure of the receiving device shown in FIG. 6, that is, the method further includes: an encoding module 13,

Here, the encoding module 13 is configured to: after the receiving device sends the channel state indication information to the sending device, the indicator i _e indicated by the precoding matrix corresponding to the second codebook and the second The order Rank (W2) of the codebook W2 is jointly encoded, and the indicator i _a indicated by the precoding matrix of the first codebook W1 is jointly encoded with the CQI.

In a fourth implementation manner, the channel state indication information may include: a combination of the order of the first codebook W1, Rank (W1), and the order of the second codebook, W2, Rank (W2) Value

The sending module 12 can be specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (Wl) and the order of the second codebook W2 (W2) The combined quantized value determines the order of the first codebook W1, Rank (W1), and the order of the second codebook W2, and according to the order of the first codebook W1 and the second codebook The order of W2 determines the precoding matrix W.

Further, the channel state indication information may be in addition to the quantized value including the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. The method includes: a total order of the precoding matrix W. The first code determined by the transmitting device to further verify a combined quantized value according to the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 The correctness of the order Rank of the W1 (Wl) and the order of the second codebook W2, Rank (W2).

In a fifth implementation manner, the channel state indication information may include: an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;

The sending module 12 can be specifically configured to: And transmitting the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2.

In a sixth implementation manner, the channel state indication information may include: a total order of the precoding matrix W;

The sending module 12 can be specifically configured to:

Further, in the foregoing various implementation manners, the first codebook W1 and the second codebook W2 may be selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.

FIG. 7 is a schematic structural diagram of Embodiment 1 of a transmitting device according to the present invention. The transmitting device in this embodiment may be a base station or a terminal. As shown in FIG. 7, the transmitting device 700 of this embodiment may include: a sending module 21, a receiving module 22, and a processing module 23, where

The sending module 21 can be configured to send a reference signal to the receiving device.

The receiving module 22 may be configured to receive the channel state indication information sent by the receiving device, where the processing module 23 may be configured to determine, according to the channel state indication information, a precoding matrix selected by the receiving device from the codebook based on the reference signal. W, wherein the precoding matrix W is a product or a direct product of two matrices W1 and W2,

The order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.

Further, the order of the second codebook W2, Rank (W2), is 1.

The sending device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 4, and the implementation principle is similar, and details are not described herein again.

The transmitting device of this embodiment determines, according to the received channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, because the precoding matrix W selected by the transmitting device is representative of the horizontal direction. The first codebook W1 and the codebook representing the vertical direction are second The product or direct product of the codebook W2, so that the characteristics of the three-dimensional beam vector can be expressed in the codebook, so the precoding matrix W can be used as a 3D codebook; and by defining the order Rank of the first codebook W1 ( W1) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and therefore, the 3D codebook The accuracy is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of precoding, thereby reducing performance loss and improving system throughput. .

Further, the foregoing embodiment may also have the following six specific implementation manners.

In a first implementation manner, the channel state indication information includes: an indicator i _a indicated by a precoding matrix of the first codebook W1 and an indicator i _e indicated by a precoding matrix of the second codebook W2 _; The processing module 23 can be specifically used to:

In a second implementation manner, the channel state indication information includes: an indicator i _a indicated by a precoding matrix corresponding to the first codebook, an indicator i _e indicated by a precoding matrix of the second codebook W2, and a channel quality An information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;

The processing module 23 can be specifically configured to:

According to the order Rank of the second codebook W2 (W2) and the total order of the precoding matrix W Number determining the order Rank of the first codebook W1 (Wl);

In a fourth implementation manner, the channel state indication information includes: a combined quantized value of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) The processing module 23 can be specifically configured to:

Determining the order Rank (Wl) of the first codebook W1 according to the combined quantized value of the order Rank of the first codebook W1 and the order of the second codebook W2 (W2) And an order Rank of the second codebook W2 (W2);

The processing module 23 can be specifically configured to:

Determining, according to a total order of the precoding matrix W and antenna configuration information of the transmitting device, an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2. . The antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;

Further, in the above various implementation manners, the first codebook W1 and the second codebook W2 are respectively selected from a 2-antenna codebook, a 4-antenna codebook or an 8-antenna codebook of the Long Term Evolution (LTE) system.

FIG. 8 is a schematic structural diagram of a hardware structure of a receiving device according to Embodiment 3 of the present invention. The receiving device in this embodiment may be a base station or a terminal. As shown in FIG. 8, the receiving device 800 of this embodiment may include: a receiver 801 and a transmitter 802. Optionally, the receiving device may further include a processor 803 and a memory 804. The receiver 801, the transmitter 802, the processor 803, and the memory 804 may be connected through a system bus or the like. In FIG. 8, the system bus is connected as an example; the system bus may be an ISA bus, a PCI bus, or an EISA bus. The system bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus.

The receiver 801 may be configured to select a precoding matrix W from the codebook based on a reference signal sent by the sending device, where the precoding matrix W is a product of the first codebook W1 and the second codebook W2 or Direct product,

The order of W2 Rank (W2);

The transmitter 802 is configured to send channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.

Further, the order of the second codebook W2, Rank (W2), is 1.

The receiving device of this embodiment selects the precoding matrix W from the codebook based on the reference signal transmitted by the transmitting device, by using the first codebook W1 representing the horizontal direction and the second codebook W2 representing the vertical codebook. Constructed to be able to represent the characteristics of the three-dimensional beam vector in the codebook, so the constructed precoding matrix W can be used as a 3-dimensional (3D) codebook; and by defining the order Rank of the first codebook W1 (W1) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the constructed 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and thus, the constructed The accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of the precoding, thereby reducing performance loss. High system throughput.

Further, the receiving device of this embodiment may also have the following six specific implementation manners. In a first implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix of the first codebook W1 and an indicator i _e indicated by a precoding matrix of the second codebook W2 _;

The transmitter 802 can be specifically configured to:

Transmitting, by the sending device, the channel state indication information, so that the sending device determines the second according to the order Rank of the first codebook W1, Rank (W1), and the total order of the precoding matrix W. The order of the codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2;

The processor 803 may be configured to: after the receiving device sends the channel state indication information to the sending device, the indicator i _a indicated by the precoding matrix corresponding to the first codebook and the first code The order Rank (W1) of the W1 is jointly encoded, and the indicator i _e indicated by the precoding matrix of the second codebook W2 is jointly encoded with the CQI.

The transmitter 802 can be specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device determines the first according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W The order of the codebook W1, Rank (Wl), and according to the order of the first codebook W1 and the first The order of the two codebooks W2 determines the precoding matrix W.

Here, the processor 803 may be configured to: after the receiving device sends the channel state indication information to the sending device, the indicator i _e indicated by the precoding matrix corresponding to the second codebook and the first The order Rank (W2) of the two codebooks W2 is jointly coded, and the indicator i _a indicated by the precoding matrix of the first codebook W1 is jointly encoded with the CQI.

In a fourth implementation manner, the channel state indication information may include: a combination of the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) Value

The transmitter 802 can be specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) The combined quantized value determines an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2, and according to the order of the first codebook W1 and the The order of the second codebook W2 determines the precoding matrix W.

Further, the channel state indication information includes an order of the first codebook W1

In addition to the quantized value of the combination of the Rank (W1) and the order Rank (W2) of the second codebook W2, the total order of the precoding matrix W may also be included. The first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2 The correctness of the order Rank of the W1 (W1) and the order of the second codebook W2, Rank (W2).

In a fifth implementation manner, the channel state indication information may include: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;

The transmitter 802 can be specifically configured to:

Transmitting, by the transmitting device, channel state indication information, so that the transmitting device determines the precoding matrix W according to an order of the first codebook W1 and an order of the second codebook W2.

The transmitter 802 can be specifically configured to:

Transmitting the channel state indication information to the sending device, so that the sending device determines the first codebook according to a total order of the precoding matrix W and antenna configuration information of the receiving device. The order Rank of the W1 (Wl) and the order of the second codebook W2, Rank (W2), and determine the order according to the order of the first codebook W1 and the order of the second codebook W2 The precoding matrix W, wherein the antenna configuration information of the transmitting device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.

FIG. 9 is a schematic diagram of the hardware structure of the second embodiment of the sending device of the present invention. The sending device in this embodiment may be a base station or a terminal. As shown in FIG. 9, the transmitting device 900 of this embodiment may include: a transmitter 901, a receiver 902, and a processor 903. Optionally, the receiving device may further include a memory 904. The transmitter 901, the receiver 902, the processor 903, and the memory 903 can be connected through a system bus or the like. In FIG. 9, the system bus is connected as an example; the system bus can be an ISA bus, a PCI bus, or an EISA bus. The system bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus. among them,

The transmitter 901 is configured to send a reference signal to the receiving device.

The receiver 902 may be configured to receive the channel state indication information that is sent by the receiving device, where the processor 903 may be configured to determine, according to the channel state indication information, a precoding matrix selected by the receiving device from the codebook based on the reference signal. W, wherein the precoding matrix W is a direct product or a product of two matrices W1 and W2,

The order Rank (Wl) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.

Further, the order of the second codebook W2, Rank (W2), is 1.

The transmitting device of this embodiment determines, according to the received channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, because the precoding matrix W selected by the transmitting device is representative of the horizontal direction. a direct product or a product of the first codebook W1 and the second codebook W2 representing the vertical codebook, so that the characteristics of the three-dimensional beam vector can be expressed in the codebook, and thus the precoding matrix W can be used as a 3D codebook; By defining the first codebook W1 The order Rank (Wl) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and therefore, The accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of the precoding, thereby reducing performance loss and improving. The throughput of the system.

In a first implementation manner, the channel state indication information may include: an indicator i _a indicated by a precoding matrix of the first codebook W1 and an indicator i _e indicated by a precoding matrix of the second codebook W2 _; The processor 903 can be specifically used to:

The processor 903 can be specifically configured to:

Determining the order Rank (W2) of the second codebook W2 according to the order Rank (Wl) of the first codebook W1 and the total order of the precoding matrix W;

The processor 903 can be specifically configured to:

Determining the order Rank (Wl) of the first codebook W1 according to the order of the second codebook W2 (W2) and the total order of the precoding matrix W;

In a fourth implementation manner, the channel state indication information includes: a combined quantized value of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) The processor 903 can be specifically configured to:

According to the order of the first codebook W1, Rank (W1) and the order of the second codebook W2

The combined quantized value of Rank (W2) determines the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2;

The processor 903 can be specifically configured to:

Further, in the above various implementation manners, the first codebook W1 and the second codebook W2 The two antenna codebooks, the four antenna codebooks, or the eight antenna codebooks of the Long Term Evolution (LTE) system are respectively selected. 10 is a schematic structural diagram of an embodiment of a communication system according to the present invention. As shown in FIG. 10, the system 1000 of the present embodiment includes: a receiving device and a transmitting device, where the receiving device can adopt the structure of the device embodiment shown in FIG. Correspondingly, the technical solution of the method embodiment shown in FIG. 3 can be performed, and the sending device can adopt the structure of the device embodiment shown in FIG. 9 , and correspondingly, the technical solution of the method embodiment shown in FIG. 4 can be executed, and the implementation principle thereof is implemented. Similar to the technical effect, it will not be described here.

One of ordinary skill in the art will appreciate that all or a portion of the steps to implement the various method embodiments described above can be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A method for determining precoding matrix indication, characterized by including:

The receiving device selects the precoding matrix w from the codebook based on the reference signal sent by the sending device, where the precoding matrix W is the product or direct product of the first codebook W1 and the second codebook W2, where, the precoding matrix W is the product or direct product of the first codebook W1 and the second codebook W2. The order Rank (Wl) of the first codebook W1 is greater than or equal to the second codebook

Rank (W2) of W2;

The receiving device sends channel status indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel status indication information.

2. The method according to claim 1, characterized in that,

The order Rank (W2 ) of the second codebook W2 is 1.

3. The method according to claim 1 or 2, characterized in that,

The channel state indication information includes: an indicator ia indicated by the precoding matrix of the first codebook W1 and _an indicator _{ie indicated by the precoding matrix of the second codebook W2;}

The receiving device sends channel status indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel status indication information, including:

The receiving device sends the channel status indication information to the sending device, so that the sending device determines the corresponding codebook order according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order. The order of the first codebook W1 and the order of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2. W.

4. The method according to claim 1 or 2, characterized in that,

The channel state indication information includes: an indicator ia indicated by a precoding matrix corresponding to the first codebook _, an indicator _ie indicated by a precoding matrix indicated by the second codebook W2, a channel quality information indicator CQI, the said third The order Rank (Wl) of the codebook Wl and the total order of the precoding matrix W;

The receiving device sends the channel status indication information to the sending device, so that the sending device determines based on the order Rank (Wl) of the first codebook W1 and the total order of the precoding matrix W The order Rank (W2) of the second codebook W2 is determined according to the order of the first codebook W1 and the order of the second codebook W2.

5. The method according to claim 4, characterized in that, when the receiving device transmits Before the sending device sends channel status indication information, it includes:

The receiving device jointly encodes the indicator i _a indicated by the precoding matrix corresponding to the first codebook and the order Rank (W1) of the first codebook W1, and encodes the indicator i a of the second codebook W2 The indicator i _e indicated by the precoding matrix is jointly encoded with the CQI.

6. The method according to claim 1 or 2, characterized in that,

The channel state indication information includes: an indicator ia indicated by the precoding matrix corresponding to the first codebook, _an indicator _ie indicated by the precoding matrix of the second codebook W2, the CQI, the second codebook The order Rank (W2) of W2 and the total order of the precoding matrix W;

The receiving device sends the channel status indication information to the sending device, so that the sending device determines based on the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W The order Rank (Wl) of the first codebook W1 is determined according to the order of the first codebook W1 and the order of the second codebook W2.

7. The method according to claim 6, characterized in that, before the receiving device sends the channel status indication information to the sending device, it includes:

The receiving device jointly encodes the indicator _i indicated by the precoding matrix corresponding to the second codebook and the order Rank (W2) of the second codebook W2, and The indicator i _a indicated by the precoding matrix is jointly encoded with the CQI.

8. The method according to claim 1 or 2, characterized in that,

The channel state indication information includes: a quantized value of a combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2;

The receiving device sends the channel status indication information to the sending device, so that the sending device determines the order of the first codebook W1 according to the order Rank (W1) of the first codebook W1 and the order Rank of the second codebook W2. The quantized value of the combination of (W2) determines the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2, and according to the order Rank (W1) of the first codebook W1 number and the order of the second codebook W2 determine the precoding matrix W.

9. The method according to claim 8, characterized in that the channel status indication information further Including: the total order of the precoding matrix w;

The receiving device sends the channel status indication information to the sending device, so that the sending device determines the order of the first codebook W1 according to the order Rank (W1) of the first codebook W1 and the order Rank of the second codebook W2. The quantized value of the combination of (W2) determines the order Rank (W1) of the first codebook W1 and the order of the second codebook W2, including:

The receiving device sends the channel status indication information to the sending device, so that the sending device determines the order of the first codebook W1 according to the order Rank (W1) of the first codebook W1 and the order Rank of the second codebook W2. The combined quantized value of (W2) and the total order of the precoding matrix W determine the order Rank (W1) of the first codebook W1 and the order of the second codebook W2.

10. The method according to claim 1 or 2, characterized in that,

The channel state indication information includes: Rank (W1) of the first codebook W1 and Rank (W2) of the second codebook W2;

The receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2 .

11. The method according to claim 1 or 2, characterized in that,

The channel status indication information includes: the total order of the precoding matrix W. ;

The receiving device sends channel status indication information to the sending device, so that the sending device determines the precoding matrix W according to the indication information, including:

The receiving device sends the channel status indication information to the sending device, so that the sending device determines the first codebook according to the total order of the precoding matrix W and the antenna configuration information of the sending device. The order Rank(W1) of W1 and the order Rank(W2) of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2. Precoding matrix W, wherein the antenna configuration information of the sending device includes: the number of first antenna ports, the number of second antenna ports, and the polarization type of the antenna.

12. The method according to any one of claims 1 to 11, wherein the first codebook W1 and the second codebook W2 are respectively from the 2-antenna codebook and the 4-antenna codebook of the Long Term Evolution LTE system. Select from codebook or 8-antenna codebook.

13. A method for determining a precoding matrix indication, characterized by including: the sending device sending a reference signal to the receiving device;

The sending device receives the channel status indication information sent by the receiving device;

The sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, where the precoding matrix W is the product or direct product of two matrices W1 and W2 ,

Among them, the order Rank (W1) of the first codebook W1 is greater than or equal to the second codebook

Rank (W2) of W2.

14. The method according to claim 13, characterized in that,

The order Rank (W2 ) of the second codebook W2 is 1.

15. The method according to claim 13 or 14, characterized in that,

The sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, including:

The sending device determines the order of the first codebook W1 and the order of the second codebook W2 according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order. number;

The sending device determines the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the order of the first codebook W1 and the order of the second codebook W2.

16. The method according to claim 13 or 14, characterized in that,

The channel state indication information includes: an indicator ia indicated by a precoding matrix corresponding to the first codebook _, an indicator _ie indicated by a precoding matrix indicated by the second codebook W2, a channel quality information indicator CQI, the said third The order Rank (W1) of a codebook W1 and the total order of the precoding matrix W;

The sending device determines the order Rank (W2) of the second codebook W2 based on the order Rank (W1) of the first codebook W1 and the total order of the precoding matrix W;

17. The method according to claim 13 or 14, characterized in that,

The sending device determines the order Rank (W1) of the first codebook W1 based on the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W;

18. The method according to claim 13 or 14, characterized in that,

The sending device determines the order of the first codebook W1 based on a quantized value of a combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 Rank (W1) and the order Rank (W2) of the second codebook W2 _;

19. The method according to claim 18, wherein the channel state indication information further includes: the total order of the precoding matrix W;

The sending device determines the order of the first codebook W1 based on a quantized value of a combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 Rank (W1) and the order Rank (W2) of the second codebook W2 include:

The sending device determines the quantization value of the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W. Determine the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 o

20. The method according to claim 13 or 14, characterized in that, The channel state indication information includes: the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2;

21. The method according to claim 13 or 14, characterized in that,

The channel status indication information includes: the total order of the precoding matrix W;

The sending device determines the order Rank (W1 ) of the first codebook W1 and the order of the second codebook W2 according to the total order of the precoding matrix W and the antenna configuration information of the transmitting device. Rank (W2) o Wherein, the antenna configuration information of the sending device includes: the number of first antenna ports, the number of second antenna ports and the polarization type of the antenna;

22. The method according to any one of claims 13 to 21, wherein the first codebook W1 and the second codebook W2 are respectively from the 2-antenna codebook and the 4-antenna codebook of the Long Term Evolution LTE system. Select from codebook or 8-antenna codebook.

23. A receiving device, characterized by: including:

The receiving module is configured to select the precoding matrix W from the codebook based on the reference signal sent by the sending device, where the precoding matrix W is the product or direct product of the first codebook W1 and the second codebook W2,

Wherein, the order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2;

A sending module, configured to send channel status indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel status indication information.

24. The receiving device according to claim 23, characterized in that,

The order Rank (W2 ) of the second codebook W2 is 1.

25. The receiving device according to claim 23 or 24, characterized in that, The channel state indication information includes: an indicator ia indicated by the precoding matrix of the first codebook W1 and _an indicator _{ie indicated by the precoding matrix of the second codebook W2;}

The sending module is specifically used for:

Send the channel status indication information to the sending device, so that the sending device determines the first code respectively according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order. The order of the codebook W1 and the order of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2.

26. The receiving device according to claim 23 or 24, characterized in that,

The sending module is specifically used for:

Send the channel status indication information to the sending device, so that the sending device determines the second codebook based on the order Rank (Wl) of the first codebook W1 and the total order of the precoding matrix W. The order Rank (W2) of the codebook W2 is determined according to the order of the first codebook W1 and the order of the second codebook W2.

27. The receiving device according to claim 26, further comprising:

An encoding module, configured to compare the indicator ^ indicated by the precoding matrix corresponding to the first codebook with the order of the first codebook W1 before the receiving device sends the channel state indication information to the sending device. Rank (Wl) is jointly encoded, and the indicator _i indicated by the precoding matrix of the second codebook W2 is jointly encoded with the CQI.

28. The receiving device according to claim 23 or 24, characterized in that,

The sending module is specifically used for:

Send the channel status indication information to the sending device, so that the sending device determines the first order according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W. The order Rank (Wl) of the codebook W1 is determined according to the order of the first codebook W1 and the order of the second codebook W2.

29. The receiving device according to claim 28, further comprising: an encoding module, configured to convert the second codebook corresponding to the second codebook before the receiving device sends the channel status indication information to the sending device. The indicator _ie indicated by the precoding matrix is jointly encoded with the order Rank (W2) of the second codebook W2, and the indicator ia indicated by the precoding matrix of the first codebook W1 _is combined with the CQI Perform joint coding.

30. The receiving device according to claim 23 or 24, characterized in that,

The sending module is specifically used for:

Send the channel state indication information to the sending device, so that the sending device determines according to the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. The combined quantized value determines the order Rank (W1) of the first codebook W1 and the order of the second codebook W2, and based on the order of the first codebook W1 and the second codebook The order of W2 determines the precoding matrix W.

31. The receiving device according to claim 30, wherein the channel status indication information further includes: the total order of the precoding matrix W;

The sending module is specifically used for:

Send the channel state indication information to the sending device, so that the sending device determines according to the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. The combined quantization value and the total order of the precoding matrix W determine the order Rank (W1 ) of the first codebook W1 and the order of the second codebook W2.

32. The receiving device according to claim 23 or 24, characterized in that,

The sending module is specifically used for:

Channel state indication information is sent to the sending device, so that the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2.

33. The receiving device according to claim 23 or 24, characterized in that,

The sending module is specifically used for: Send the channel status indication information to the sending device, so that the sending device determines the order of the first codebook W1 according to the total order of the precoding matrix w and the antenna configuration information of the sending device. Rank (W1) and the order Rank (W2) of the second codebook W2, and determine the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2. , wherein the antenna configuration information of the sending device includes: the number of first antenna ports, the number of second antenna ports, and the polarization type of the antenna.

34. The receiving device according to any one of claims 23 to 33, wherein the first codebook W1 and the second codebook W2 are respectively derived from the 2-antenna codebook and 4-antenna codebook of the Long Term Evolution LTE system. Select from the antenna codebook or 8-antenna codebook.

35. A sending device, characterized in that it includes:

The sending module is used to send reference signals to the receiving device;

A receiving module, configured to receive channel status indication information sent by the receiving device;

A processing module configured to determine, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, where the precoding matrix W is the product of two matrices W1 and W2 or a direct result. product,

Wherein, the order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.

36. The sending device according to claim 35, characterized in that,

The order Rank (W2 ) of the second codebook W2 is 1.

37. The sending device according to claim 35 or 36, characterized in that,

The processing module is specifically used for:

Determine the order of the first codebook W1 and the order of the second codebook W2 respectively according to the mapping relationship between the indicator indicated by the preset rules or the preset precoding matrix and the codebook order;

38. The sending device according to claim 35 or 36, characterized in that,

The channel state indication information includes: an indicator ia indicated by a precoding matrix corresponding to the first codebook _, an indicator _ie indicated by a precoding matrix corresponding to the second codebook W2, a channel quality information indicator CQI, The order Rank (Wl) of the first codebook Wl and the total order of the precoding matrix W; the processing module is specifically used to:

Determine the order Rank (W2) of the second codebook W2 according to the order Rank (W1) of the first codebook W1 and the total order of the precoding matrix W;

39. The sending device according to claim 35 or 36, characterized in that,

The processing module is specifically used for:

Determine the order Rank (W1) of the first codebook W1 according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W;

40. The sending device according to claim 35 or 36, characterized in that,

The processing module is specifically used for:

According to the order Rank (Wl) of the first codebook W1 and the order of the second codebook W2

41. The transmitting device according to claim 40, wherein the channel status indication information further includes: the total order of the precoding matrix W;

The processing module is specifically used for:

The first codebook W1 is determined based on the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W. The order Rank (Wl) of the first codebook W1 and the order of the second codebook W2.

42. The transmitting device according to claim 35 or 36, characterized in that the channel state indication information includes: the order Rank (W1) of the first codebook W1 and the order Rank (W1) of the second codebook W2. Number Rank (W2);

The processing module is specifically used for:

43. The sending device according to claim 35 or 36, characterized in that,

The processing module is specifically used for:

The order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 are determined according to the total order of the precoding matrix W and the antenna configuration information of the transmitting device. . Wherein, the antenna configuration information of the sending device includes: the number of first antenna ports, the number of second antenna ports and the polarization type of the antenna;

44. The transmitting device according to any one of claims 35 to 43, characterized in that the first codebook W1 and the second codebook W2 are respectively derived from the 2-antenna codebook and 4 of the Long Term Evolution LTE system. Select from the antenna codebook or 8-antenna codebook.