CN102340371B - Transmission method and system of physical control format indicator channel - Google Patents

Abstract

The invention discloses a transmission method and a system of a physical control format indicator channel. The method comprises the steps that a transmitting side conducts simplex code coding processing, modulation, pre-coding processing and reprocessing to a physical control format indicator according to preset coding speed; for each transmitting antenna, reference signals and data which is obtained after reprocessing are mapped to the physical resource blocks of the transmitting antenna according to the preset resource mapping scheme of the physical control format indicator channel and then are transmitted; each receiving antenna conducts resource extraction of the physical control format indicator channel to the received data and reference signals according to the preset resource mapping scheme, space channel vectors from a serving base station and an interference base station to the receiving antenna according to the obtained reference signals, space channel matrices are constructed and interference elimination matrices are obtained accordingly; and the data transmitted by the interference base station is eliminated according to the interference elimination matrices and a detection criteria and the physical control format indicator is obtained through processing inverse to the processing of the transmitting side.

Description

Transmission method and system of physical control format indicator channel

Technical Field

The present invention relates to the field of communications, and in particular, to a method and a system for transmitting a Physical Control Format Indicator Channel (PCFICH), and a transmitting apparatus and a receiving apparatus for the physical control Format Indicator Channel.

Background

The data rate provided by the existing cellular mobile communication system is greatly different between the cell center and the cell edge, and the difference not only affects the capacity of the whole system, but also causes great difference in the service quality obtained by the user at different positions, thereby affecting the user experience. Therefore, many wireless communication systems have improved cell edge performance as one of the main requirements.

Interference between cells (ICI) is an inherent problem in cellular mobile communication systems, and the conventional solutions mainly use frequency reuse. In frequency multiplexing, only specific values of the multiplexing coefficient are selected, for example, 1, 3, 7, etc. may be selected. When the reuse factor is equal to 1, it indicates that the neighboring cells all use the same frequency resources, and at this time, the interference at the cell edge is very serious, and if a larger reuse factor is used, for example, 3 or 7 is used, ICI can be effectively suppressed, but the spectral efficiency at this time will be correspondingly reduced to 1/3 or 1/7 of the original spectral efficiency.

Taking a Long Term Evolution (Long Term Evolution, LTE for short) system and a subsequent system (e.g., LTE-Advanced system, etc.) as an example, a Control Format Indicator (CFI) is carried by a PCFICH in the LTE system, where the CFI indicates the number of OFDM symbols occupied by a Control channel in each subframe, the CFI has a source length of 2 bits, and the PCFICH is placed in the 1 st OFDM symbol.

The PCFICH carries information indicating how to divide the boundary between the control signaling region and the data region in each subframe, which is important. Therefore, if the receiving side cannot correctly demodulate the PCFICH channel, it is impossible to correctly demodulate the OFDM symbol occupied by the downlink control information, and it is impossible to obtain correct downlink control information. If the demodulation of the PCFICH is wrong, the processing amount and the processing delay between the base station and the UE will be greatly increased, so that the transmission of the PCFICH by adopting the transmission mode of effectively suppressing the interference is one of the key points for realizing the normal operation of the communication system.

In the LTE system, in order to ensure high robustness of the PCFICH, 2-bit information of the CFI is encoded by a (3, 2) simplex code through 10 repetitions and then by adding two systematic bits, and then a PCFICH sequence of 16QPSK symbols is obtained, and in order to obtain a frequency diversity gain as large as possible, the 16QPSK symbols may be distributed in 4 discrete Resource Element Groups (REGs). Wherein, PCFICH sequences corresponding to different cells are placed on different subcarrier groups according to different cell IDs, and the position of each REG in the whole system bandwidth will be described below.

Let z^(p)(i)＝〈y^(p)(4i)，y^(p)(4i+1)，y^(p)(4i+2)，y^(p)(4i +3) >, where (i ═ 1, 2, …, 4), y is the PCFICH sequence of QPSK symbols of length 16 transmitted on antenna p, four values in sequence in y constitute one REG, and y sequence has a total of 4 REGs; z is a radical of^(p)(i) Where, (i ═ 1, 2, 3, 4) is used to indicate the corresponding REG sequence number in the y sequence. At the time of mapping, the start position of each REG is represented as follows:

z^(p)(0) starting position mapped to time-frequency resource block

z^(p)(1) Starting position mapped to time-frequency resource block

z^(p)(2) Starting position mapped to time-frequency resource block

z^(p)(3) Starting position mapped to time-frequency resource block

Wherein, indicating the number of Resource blocks (abbreviated as RBs) corresponding to the downlink bandwidth,indicates the number of sub-carriers corresponding to one RB,indicates cell id (cell id).

Although the PCFICH sequences of different cells are distributed at different frequency domain positions and are orthogonal in the frequency domain between the positions. However, according to the LTE system (and other communication systems, for example, LTE-Advanced system) control channel resource distribution scheme, in a cell edge region, the PCFICH will inevitably be interfered by other control channels from other cell base stations, a high probability of misjudgment of the PCFICH will occur due to a severe inter-cell interference problem, and the control channel will not adopt automatic retransmission, so that a failure of downlink control channel detection may be caused by a wrong decoding, normal communication may be affected, and system overhead may be increased.

Aiming at the problem that the normal communication is influenced because the receiving party cannot demodulate the physical control format indication information due to the fact that the PCFICH is subjected to strong inter-cell interference in the related technology, an effective solution is not provided at present.

Disclosure of Invention

Aiming at the problem that normal communication is influenced because a physical control format indication channel is subjected to strong inter-cell interference and a receiving party cannot demodulate the physical control format indication, the invention provides a transmission method and a transmission system of the physical control format indication channel, and a transmitting device and a receiving device of the physical control format indication channel, which can effectively eliminate and reduce the influence of the inter-cell interference on the physical control format indication channel, so that the receiving party can correctly detect and receive the physical control format indication information, and the downlink control channel can be correctly detected.

The technical scheme of the invention is realized as follows:

according to an aspect of the present invention, there is provided a transmission method of a physical control format indicator channel, which is used for realizing transmission of at least one antenna and reception of at least one antenna of the physical control format indicator channel.

The method comprises the following steps: the sender carries out simplex code coding processing on the physical control format indication according to a preset coding rate; the sender modulates the data obtained after coding according to a preset modulation mode; the sender carries out precoding processing on the modulated data according to a preset precoding scheme; the sender repeatedly processes the data of each transmitting antenna after precoding, wherein the times of repeated processing, the coding rate and the modulation order of the modulation mode are determined by the resource mapping length of a physical control format indication channel and the length indicated by the physical control format; for each transmitting antenna, the sender maps the reference signal and the data obtained after repeated processing to a physical resource block of the transmitting antenna according to a resource mapping scheme of a preset physical control format indication channel, and sends the mapped data and reference signal; each receiving antenna of the receiver extracts the resources of the physical control format indication channel from the received data and the reference signal according to the resource mapping scheme of the predetermined physical control format indication channel; each receiving antenna calculates a space channel vector from a service base station to which the receiving party belongs and an interference base station to the receiving party according to a reference signal obtained by extracting resources of a physical control format indication channel, and obtains a space channel matrix of the physical control format indication channel according to the space channel vectors from the service base station and the interference base station to all or part of the receiving antennas of the receiving party; the receiver constructs an interference elimination matrix of the physical control format indication channel based on the preset precoding scheme according to the spatial channel matrix of the physical control format indication channel, wherein the interference elimination matrix of the physical control format indication channel is obtained by modeling according to the preset precoding scheme, a transmitting antenna, a receiving antenna, repeated processing, a service base station and an interference base station; and the receiver eliminates the data sent by the interference base station according to the interference elimination matrix of the physical control format indication channel and a preset detection criterion, and obtains the physical control format indication according to the preset modulation mode and the inverse processing of the simplex code coding processing.

Wherein, obtaining the spatial channel matrix of the physical control format indicator channel according to the spatial channel vectors of all or part of receiving antennas from the serving base station and the interfering base station to the receiving party comprises: each receiving antenna separates and estimates the reference signals of the service base station and the interference base station obtained by extracting the resources of the physical control format indication channel to obtain the physical channels from all transmitting antennas to the receiving antennas of the receiving party, and the estimated physical channels are arranged according to a repeated processing mode to form a space channel vector corresponding to the receiving antenna; and the receiving party arranges all or part of the space channel vectors corresponding to the receiving antennas according to the serial numbers of the receiving antennas to form a space channel matrix of the physical control format indication channel.

Before mapping the reference signal and the data obtained after the repeated processing to the physical resource block of the transmitting antenna, the method may further include: interweaving the data after the repeated processing according to a preset interweaving scheme, and taking the interweaved data as the data to be mapped;

and, the performing, by each receiving antenna, resource extraction of the physical control format indicator channel on the respective received data and reference signals according to the resource mapping scheme of the predetermined physical control format indicator channel includes: the receiving party extracts the resources of the received data and inversely interleaves the data extracted by the resources according to the preset interleaving scheme;

and, before the receiving side arranges the physical channels estimated by each receiving antenna according to a repetition processing manner, the method further includes: and performing reverse interleaving on the estimated physical channel according to the predetermined interleaving scheme.

Further, constructing an interference cancellation matrix based on the predetermined precoding scheme includes: determining the dimensionality of an interference elimination matrix of the physical control format indication channel according to the preset precoding scheme, the number of transmitting antennas of the transmitting party, the number of receiving antennas of the receiving party, the number of times of repeated processing on precoded data and the number of the interference base stations; and

for each channel element in the spatial channel matrix, determining a first dimension sequence number of the channel element in the interference elimination matrix according to a sequence number of a receiving antenna, a sequence number of a transmitting antenna, a sequence number of repeated processing and the predetermined precoding scheme of the channel element, and determining a second dimension sequence number of the channel element in the interference elimination matrix according to a base station sequence number of the channel element, a sequence number of the transmitting antenna and the predetermined precoding scheme.

In addition, the number of times of repeated processing N, the coding rate R, the modulation order M of the modulation scheme, the resource mapping length O of the physical control format indication channel, and the length I of the physical control format indication satisfy the following conditions:

the method may further comprise: and according to the number of the interference base stations, the number N of times of repeated processing of the data after the pre-coding processing is predetermined, wherein N is more than or equal to B +1, and B is the number of the interference base stations.

In addition, mapping the reference signal and the data obtained after the repeated processing to the physical resource block of the transmitting antenna comprises: dividing the data obtained after repeated processing into four data groups; determining the frequency domain starting positions of the four data groups to be mapped according to the following formula:

<math> <mrow> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>=</mo> <mover> <mi>k</mi> <mo>&OverBar;</mo> </mover> </mrow> </math>

wherein k is₁A frequency domain starting position for data mapping of the first data group; k is a radical of₂A frequency domain start position mapped for data of the second data group; k is a radical of₃A frequency domain start position for data mapping of the third data group; k is a radical of₄A frequency domain start position mapped for data of the fourth data group;is a predetermined frequency domain starting position;the number of physical resource blocks corresponding to the downlink bandwidth,the number of sub-carriers corresponding to each physical resource block.

In addition, before the sender maps the data obtained after the repeated processing to the physical resource block of the transmitting antenna, the method may further include: and the sender reserves resource positions required to be mapped by the reference signals of the serving base station and the interference base station according to the resource mapping scheme of the predetermined physical control format indication channel, wherein the reserved resource positions are only used for mapping the reference signals in the mapping process.

In addition, when the sender utilizes a single transmitting antenna to send the physical control format indicator channel, the predetermined precoding scheme is a single-antenna sending scheme; and under the condition that the transmitting party utilizes a plurality of transmitting antennas to transmit the physical control format indication channel, the preset precoding scheme is a transmission diversity transmission scheme.

Optionally, the predetermined detection criteria may include one of: maximum likelihood, minimum mean square error, least squares method.

According to another aspect of the present invention, there is provided a transmission system of a physical control format indicator channel, the system being used for realizing transmission of at least one antenna and reception of at least one antenna of the physical control format indicator channel, the system comprising a transmission apparatus and a reception apparatus.

Specifically, the transmission device includes: the encoding module is used for carrying out simplex code encoding processing on the physical control format indication according to a preset encoding rate; the modulation module is used for modulating the data obtained after coding according to a preset modulation mode; the pre-coding module is used for pre-coding the modulated data according to a preset pre-coding scheme; a repeating module, configured to repeat processing on data of each transmit antenna after precoding processing, where a number of times of the repeated processing, the coding rate, and a modulation order of the modulation scheme are determined by a resource mapping length of a physical control format indicator channel and a length indicated by the physical control format; a mapping module, configured to map, for each transmit antenna, the reference signal and the data obtained after the repeated processing to a physical resource block of the transmit antenna according to a resource mapping scheme of a predetermined physical control format indicator channel; at least one transmitting antenna for transmitting the mapped data and reference signals;

the receiving apparatus includes: at least one receiving antenna, wherein each receiving antenna performs resource extraction of a physical control format indicator channel on data and reference signals received by the receiving antenna according to the resource mapping scheme of the predetermined physical control format indicator channel, and is used for calculating a spatial channel vector from a serving base station to which the receiving device belongs and an interference base station to the receiving antenna of the receiving device according to the reference signals obtained by resource extraction of the physical control format indicator channel; a constructing module, configured to obtain a spatial channel matrix of a physical control format indicator channel according to spatial channel vectors from the serving base station and all or part of receiving antennas from an interfering base station to a receiving apparatus, and construct an interference cancellation matrix of the physical control format indicator channel based on the predetermined precoding scheme according to the spatial channel matrix of the physical control format indicator channel, where the interference cancellation matrix of the physical control format indicator channel is obtained by modeling according to the predetermined precoding scheme, transmitting antennas, receiving antennas, repetition processing, the serving base station, and the interfering base station; and the elimination module is used for eliminating the data sent by the interference base station according to the interference elimination matrix of the physical control format indication channel and a preset detection criterion, and obtaining the physical control format indication according to the preset modulation mode and the inverse processing of the simplex code coding processing.

According to another aspect of the present invention, there is provided a transmission apparatus of a physical control format indicator channel, for enabling transmission of at least one antenna of the physical control format indicator channel.

The transmission device includes: the encoding module is used for carrying out simplex code encoding processing on the physical control format indication according to a preset encoding rate; the modulation module is used for modulating the data obtained after coding according to a preset modulation mode; the pre-coding module is used for pre-coding the modulated data according to a preset pre-coding scheme; a repeating module, configured to repeat processing on data of each transmit antenna after precoding processing, where a number of times of the repeated processing, the coding rate, and a modulation order of the modulation scheme are determined by a resource mapping length of a physical control format indicator channel and a length indicated by the physical control format; a mapping module, configured to map, for each transmit antenna, the reference signal and the data obtained after the repeated processing to a physical resource block of the transmit antenna according to a resource mapping scheme of a predetermined physical control format indicator channel; at least one transmitting antenna for transmitting the mapped data and reference signals;

according to another aspect of the present invention, there is provided a receiving apparatus for a physical control format indicator channel, which is used for realizing the reception of at least one antenna of the physical control format indicator channel.

The receiving apparatus includes: at least one receiving antenna, wherein each receiving antenna performs resource extraction of a physical control format indicator channel on data and reference signals received by the receiving antenna according to the resource mapping scheme of the predetermined physical control format indicator channel, and is used for calculating a spatial channel vector from a serving base station to which the receiving device belongs and an interference base station to the receiving antenna of the receiving device according to the reference signals obtained by resource extraction of the physical control format indicator channel; a constructing module, configured to obtain a spatial channel matrix of a physical control format indicator channel according to spatial channel vectors of all or part of receiving antennas from the serving base station and the interfering base station to the receiving apparatus, and construct an interference cancellation matrix of the physical control format indicator channel based on a predetermined precoding scheme adopted by the sending apparatus according to the spatial channel matrix of the physical control format indicator channel, where the interference cancellation matrix of the physical control format indicator channel is obtained by modeling according to the predetermined precoding scheme, the transmitting antenna, the receiving antenna, the repeat processing, the serving base station, and the interfering base station; and the elimination module is used for eliminating the data sent by the interference base station according to the interference elimination matrix of the physical control format indication channel and a preset detection criterion, and obtaining the physical control format indication according to the preset modulation mode and the inverse processing of the simplex code coding processing.

By means of the technical scheme, the physical control format indication is coded, modulated, precoded, processed repeatedly and sent, and the interference elimination matrix based on the precoding scheme is constructed at the receiver, so that the interference of other base stations on the physical control format indication channel of the service base station can be effectively eliminated, the receiver can correctly detect and acquire the physical control format indication, the downlink control channel can be correctly detected, and the problem that the physical control format indication cannot be correctly detected due to the interference is avoided.

Drawings

Fig. 1 is a flowchart of a transmission method of a physical control format indicator channel according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a first example of processing at a transmitting side after the transmission method of the physical control format indicator channel according to the embodiment of the invention is applied to an LTE system;

fig. 3 is a schematic diagram of a second example of processing performed on the transmitting side after the transmission method of the physical control format indicator channel according to the embodiment of the invention is applied to the LTE system;

fig. 4 is a schematic processing diagram of a transmission method of a physical control format indicator channel according to an embodiment of the present invention, which is applied to a receiving side of an LTE system;

fig. 5 is a diagram illustrating PCFICH signal, reference signal, and data mapping when the transmission method of a physical control format indicator channel according to an embodiment of the present invention is applied to an LTE system;

fig. 6 is a schematic diagram comparing the packet error rate of the transmission method of the physical control format indicator channel according to the embodiment of the present invention with the conventional scheme under the condition of strong interference;

fig. 7 is a schematic diagram comparing the packet error rate of the transmission method of the physical control format indicator channel according to the embodiment of the invention with the conventional scheme without interference;

fig. 8 is a block diagram of a transmission system of a physical control format indicator channel according to an embodiment of the present invention.

Detailed Description

Aiming at the problem that a receiver cannot demodulate a physical control format indication due to strong inter-cell interference of a physical control format indication channel in the related technology so as to influence the normal communication of the receiver, the invention provides that a sender carries out coding, modulation and precoding processing on the physical control format indication according to a preset coding rate, and then carries out repeated processing on data of each transmitting antenna after the precoding processing, wherein the times of the repeated processing, the coding rate and the modulation order of a modulation mode are determined by the resource mapping length of the physical control format indication channel and the length of the physical control format indication; and then, the sender maps the reference signal and the repeated data and sends the reference signal and the repeated data, the receiver constructs an interference elimination matrix based on the physical control format indication according to the spatial channel matrix, and eliminates the interference of other base stations by using the interference elimination matrix and a detection criterion to obtain the physical control format indication sent by the service base station.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

According to an embodiment of the present invention, a transmission method of a physical control format indicator channel is provided, which is used for realizing the transmission of at least one antenna and the reception of at least one antenna of the physical control format indicator channel.

As shown in fig. 1, a method for transmitting a physical control format indicator channel according to an embodiment of the present invention includes:

step S101, a sender carries out simplex code coding processing on a physical control format indication according to a preset coding rate;

step S103, the sender modulates the data obtained after coding according to a preset modulation mode;

step S105, the sender carries out precoding processing on the modulated data according to a preset precoding scheme;

step S107, the sender repeatedly processes the data of each transmitting antenna after the precoding, wherein the times of the repeated processing, the coding rate and the modulation order of the modulation mode are determined by the resource mapping length of the physical control format indication channel and the length indicated by the physical control format;

step S109, for each transmitting antenna, the transmitting side maps the reference signal and the data obtained after the repeated processing to the physical resource block of the transmitting antenna according to the resource mapping scheme of the predetermined physical control format indication channel, and transmits the mapped data and reference signal;

step S111, each receiving antenna of the receiving party performs resource extraction of the physical control format indication channel on the received data and the reference signal according to a predetermined resource mapping scheme of the physical control format indication channel;

step S113, each receiving antenna calculates the space channel vector from the service base station to which the receiving party belongs and the interference base station to the receiving party according to the reference signal obtained by extracting the resource of the physical control format indication channel, and obtains the space channel matrix of the physical control format indication channel according to the space channel vectors from the service base station and the interference base station to all or part of the receiving antennas of the receiving party;

step S115, a receiver constructs an interference elimination matrix of the physical control format indication channel based on a preset precoding scheme according to a spatial channel matrix of the physical control format indication channel, wherein the interference elimination matrix of the physical control format indication channel is obtained by modeling according to the characteristics of the preset precoding scheme, a transmitting antenna, a receiving antenna, repeated processing, a service base station and an interference base station;

step S117, the receiving side cancels the data sent by the interfering base station according to the interference cancellation matrix of the physical control format indication channel and the predetermined detection criterion, and obtains the physical control format indication according to the predetermined modulation mode and the inverse processing of the simplex code encoding processing.

By means of the processing, the interference of other base stations on a physical control format indication channel of a service base station can be effectively eliminated by encoding, modulating, precoding, repeatedly processing and sending the physical control format indication and constructing an interference elimination matrix based on a precoding scheme at a receiving party, so that the receiving party can correctly detect and obtain the physical control format indication, and the problem that the physical control format indication cannot be correctly detected due to the interference is avoided.

When a spatial channel matrix of a physical control format indication channel is obtained according to spatial channel vectors of all or part of receiving antennas from a service base station and an interference base station to a receiving party, each receiving antenna separates and estimates reference signals of the service base station and the interference base station, which are obtained by extracting resources of the physical control format indication channel, so as to obtain physical channels from all transmitting antennas to the receiving antenna of the receiving party, and the estimated physical channels are arranged according to a repeated processing mode to form the spatial channel vectors corresponding to the receiving antennas; the receiving side arranges all or part of the space channel vectors corresponding to the receiving antennas according to the serial numbers of the receiving antennas to form a space channel matrix of the physical control format indication channel.

Before mapping the reference signal and the data obtained after the repeated processing to the physical resource block of the transmitting antenna, interleaving the data after the repeated processing in advance according to a preset interleaving scheme, and taking the interleaved data as the data to be mapped; and, the resource extraction of the physical control format indicator channel for the data and the reference signal respectively received by each receiving antenna according to the resource mapping scheme of the predetermined physical control format indicator channel comprises: the receiving party extracts the resources of the received data and inversely interleaves the data extracted by the resources according to a preset interleaving scheme;

and, before the receiving side arranges the physical channels estimated by each receiving antenna according to the repetitive processing manner, the method further comprises: the estimated physical channel is de-interleaved according to a predetermined interleaving scheme.

In addition, the spatial channel matrix is formed by spatial channel vectors transmitted from all transmit antennas of the transmitting side to all or a part of the receive antennas. For example, assuming that the number of the transmitting antennas and the number of the receiving antennas are 4, each of the 4 receiving antennas can obtain spatial channel vectors from all 4 transmitting antennas, and the formed spatial channel matrix may include all spatial channel vectors obtained by all receiving antennas, or may include all spatial channel vectors obtained by some receiving antennas (for example, all spatial channel vectors obtained by only 2 receiving antennas of the 4 receiving antennas may be selected to form the spatial channel matrix).

In addition, when constructing the interference elimination matrix based on the predetermined precoding scheme, the dimension of the interference elimination matrix of the physical control format indicator channel can be determined according to the predetermined precoding scheme, the number of transmitting antennas of the transmitting party, the number of receiving antennas of the receiving party, the number of times of repeated processing on the data after precoding processing, and the number of interfering base stations; and

for each channel element in the spatial channel matrix, a first dimension sequence number (which may be a row sequence number) of the channel element in the interference cancellation matrix is determined according to a sequence number of a receiving antenna, a sequence number of a transmitting antenna, a sequence number of a repetition process, and a predetermined precoding scheme of the channel element, and a second dimension sequence number (which may be a column sequence number) of the channel element in the interference cancellation matrix is determined according to a base station sequence number of the channel element, a sequence number of a transmitting antenna, and a predetermined precoding scheme.

In addition, the first dimension number may be a column number of the interference cancellation matrix, and in this case, the second dimension number is a row number of the interference cancellation matrix.

Optionally, the number N of times of the repeated processing, the coding rate R, the modulation order M of the modulation scheme, the resource mapping length O of the physical control format indication channel, and the length I of the physical control format indication satisfy the following conditions:that is, under the condition that O and I are known, the values of N, R and M can be selected according to the formula, so as to ensure that the resource mapping length of the mapped physical control format indicator channel conforms to the requirement of the LTE communication system. In addition, if the O is too large and exceeds the system requirement, the data obtained after repeated processing can be intercepted and then mapped; if O is too small to meet the system requirement, the data obtained after the repeat processing may be supplemented (for example, "0" may be supplemented to the data obtained after the repeat processing), and then the mapping may be performed.

In addition, in order to ensure the effect of interference cancellation, the number N of times of repeated processing on the data after precoding processing can be predetermined according to the number of the interfering base stations, where N is greater than or equal to B +1, and B is the number of the interfering base stations.

In order to effectively ensure the effect of the above processing to eliminate inter-cell interference, when mapping the reference signal and the data obtained after repeated processing to the physical resource block of the transmitting antenna, the serving base station and the interfering base station should use the same resource mapping length of the physical control format indicator channel, that is, the mapping positions of the physical control format indicator channels of the serving base station and the interfering base station are the same.

When the reference signal and the data obtained after the repeated processing are mapped to the physical resource block of the transmitting antenna, the data obtained after the repeated processing can be divided into four data groups; determining the frequency domain starting positions of the mapping required by the four data groups according to the following formula:

<math> <mrow> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>=</mo> <mover> <mi>k</mi> <mo>&OverBar;</mo> </mover> </mrow> </math>

wherein k is₁Is as followsA frequency domain start position of data mapping of one data group; k is a radical of₂A frequency domain start position mapped for data of the second data group; k is a radical of₃A frequency domain start position for data mapping of the third data group; k is a radical of₄A frequency domain start position mapped for data of the fourth data group;is a predetermined frequency domain starting position;the number of physical resource blocks corresponding to the downlink bandwidth,the number of sub-carriers corresponding to each physical resource block.

It should be noted that the mapping scheme shown here is only a specific example, which is intended to explain the resource mapping of the present invention and is not intended to limit the present invention. In practical applications, the mapping scheme expressed by the above formula may be adjusted, for example, the frequency domain starting position of the mapping may be adjustedThe adjustment is performed, and the adjusted mapping scheme is also within the protection scope of the present invention.

In addition, before the sender maps the data obtained after the repeated processing to the physical resource blocks of the transmitting antennas, the method may further include: and the sender reserves resource positions to be mapped by reference signals of the serving base station and the interference base station according to a resource mapping scheme of a predetermined physical control format indication channel, wherein the reserved resource positions are only used for mapping the reference signals in the mapping process.

In addition, under the condition that the sending party utilizes a single transmitting antenna to send the physical control format indication channel, the preset precoding scheme is a single-antenna sending scheme; in the case where the transmitting side performs physical control format indicator channel transmission using a plurality of transmitting antennas, the predetermined precoding scheme is a transmission diversity transmission scheme.

In step S117, the employed predetermined detection criteria include, but are not limited to, one of the following: maximum likelihood, minimum mean square error, least squares method. The above detection criteria or other more detection criteria can be selected by those skilled in the art according to the actual application scenario, and how to select the detection criteria and how to perform detection according to different detection criteria is well known to those skilled in the art and is not listed herein.

The following describes in detail the procedure of reducing or eliminating interference in the LTE system according to the present invention, taking the LTE system as an example. It should be understood by those skilled in the art that the following application procedures are only used for illustrating the scheme of the present invention, and are not limited to the present invention, and for other wireless communication systems (e.g., LTE-Advanced system, etc.), and other channels for transmitting physical control format indications in other systems, the scheme of the present invention may be used for achieving the purpose of reducing or eliminating interference, so that the terminal can correctly detect and acquire the physical control format indication.

Fig. 2 and fig. 3 illustrate a process of a transmission method of a physical control format indicator channel at a transmitting end according to an embodiment of the present invention. The processing procedure of the transmitting end in the single antenna and multi-antenna cases will be described below, respectively.

As shown in fig. 2, in the case that the sending end uses a single antenna to send the physical control format indication, the processing procedure of the sending end is as follows:

the length of the physical control format indication provided by the PCFICH source is 2 bits, the data length of the PCFICH channel designed by the LTE is 16QPSK symbols, and in order to ensure that the data length is not changed, (3, 2) simplex code encoding is required to be performed on the physical control format indication, the encoded 3-bit data is repeated for 2 times, and then two systematic bits are added, and the bit length after encoding repetition is 8 bits. Then, after scrambling by cell scrambling, modulation is performed using QPSK with a modulation symbol length of 4, and thenAnd (5) pre-coding. Is provided withThe data is transmitted by a single antenna, i is 1, 2, 3, 4 is a data serial number, K is a base station serial number, and K is 1: K. Will be provided withAfter repeating for 4 times, can be expressed as:

$[S_1^k:S_{16}^k]=[(S_1^k:S_4^k),(S_1^k:S_4^k),(S_1^k:S_4^k),(S_1^k:S_4^k)];$

after the repeated data passes through the interleaver, the following data can be obtained:

wherein,denotes the interleaver for the duplicate data block j of base station k, j being 1: 4.

As shown in fig. 3, in the case of transmitting using two transmitting antennas, the above-mentioned simplex code encoding, scrambling and QPSK modulation processing are also required, and the process is the same as that of the single antenna transmission scheme, and is not repeated here.

In the case of 2-antenna transmission, the signal transmission may be performed by using a transmission diversity method, and in this case, precoding for a multi-antenna scheme is required. Specifically, it is providedIs data after transmission diversity pre-coding, i is data serial number and i is 1, 2, 3, 4, K is base station serial number and K is 1: K, [ S [ ]₁ S₂]Is the signal transmitted by antenna 1 at subcarrier f and subcarrier f +1,is the signal transmitted by antenna 2 at subcarrier f and subcarrier f + 1. Will be provided withThe data on each antenna can be represented as repeated 4 times respectivelyAfter the repeated data passes through the interleaver, the following data can be obtained:

$\left[X_{1:16}^k\right]=[f_{\mathrm{Inter}\_1}^k(S_1^k:S_4^k),f_{\mathrm{Inter}\_2}^k(S_5^k:S_8^k),f_{\mathrm{Inter}\_3}^k(S_9^k:S_{12}^k),f_{\mathrm{Inter}\_4}^k(S_{13}^k:S_{16}^k)],$

wherein,interleaver for duplicate data block j representing base station k，j＝1∶4。May represent the transmitted data for antenna 1 and antenna 2.

In the above processing, in order to ensure the final interference cancellation effect, the PCFICH sequences of a plurality of cells need to be mapped on the frequency domain resources at the same position, and thus, the PCFICH sequences will be mappedMapping the time-frequency resources to different antenna ports according to the mapping rule of the same Cell ID, and simultaneously maintaining the mapping length unchanged, wherein the mapping rule is described as follows:

where, (i ═ 1, 2, …, 4), p denotes an antenna port

z^(p)(i) To representCorresponding REG sequence numbers in the sequences, (i ═ 1, 2, 3, 4), the frequency domain starting positions of the specific mapping are expressed as follows:

<math> <mrow> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>=</mo> <mover> <mi>k</mi> <mo>&OverBar;</mo> </mover> </mrow> </math>

wherein k is₁Frequency domain start position (i.e., z) mapped for data of first data group^(p)(0) The frequency domain starting position of the mapping); k is a radical of₂Frequency domain start position (i.e., z) for data mapping of the second data set^(p)(1) The frequency domain starting position of the mapping); k is a radical of₃Frequency domain start position (i.e., z) for data mapping of the third data group^(p)(2) The frequency domain starting position of the mapping); k is a radical of₄Frequency domain start position (i.e., z) for data mapping of the fourth data group^(p)(3) The frequency domain starting position of the mapping);is a predetermined frequency domain starting position, wherein the frequency domain starting position can be preset The number of physical resource blocks corresponding to the downlink bandwidth,the number of sub-carriers corresponding to each physical resource block.

The PCFICH is mapped to frequency domain resources, modulated to the time domain through IFFT (i.e., OFDM signal generation is completed), and can be transmitted at the antenna port by radio frequency.

Fig. 4 is a process of a transmission method of a physical control format indicator channel at a receiving end according to an embodiment of the present invention.

As shown in fig. 4, the processing procedure at the receiving end is as follows:

the received signal is represented as:wherein,the received signal on the l-th receiving antenna can be obtained after the resource extraction and reverse interleaving corresponding to the transmitting endWherein,is the receiving signal corresponding to the data with sequence number i in the repeated data block received on the ith receiving antenna of the receiving end.

Then, the extraction of the reference signals of the serving base station and the neighboring base stations (interfering base stations) is performed, and then the channels from different cells can be estimated, wherein the channels include the spatial channel vectors from the serving base station and the interfering base stations:wherein,indicating the channel estimation corresponding to the data with sequence number i in the jth repeated data block from the base station k received at the receiving antenna l,indicating gaussian noise on the receive antenna i, at which time channel estimation is completed for the serving and neighboring base stations.

Specifically, if the transmitting end is transmitting in single antenna mode, the received signal can be expressed as:

wherein,the channel estimation corresponding to the data received from the base station k, the jth repeated data block and the serial number i on the antenna l is represented, and at this time, the interference cancellation matrix is:

wherein,representing the interference cancellation matrix estimated at the l-th receive antenna. For a single receiving antenna, the number of rows of the matrix is consistent with the number of times of repeating the data block, and the number of columns of the matrix is consistent with the number of base stations. Suppose thatIs a known noise variance matrix that can be estimated using Minimum Mean Square Error (MMSE) estimation criteria

$\left[\begin{array}{c}{\hat{S}}_i^1\\ {\hat{S}}_i^2\\ .\\ .\\ .\\ {\hat{S}}_i^K\end{array}\right]=W_K\left[\begin{array}{c}{Y}_i^l\\ Y_{i+M}^l\\ .\\ .\\ .\\ Y_{i+(N-1)M}^l\end{array}\right],$ Wherein, <math> <mrow> <msub> <mi>W</mi> <mi>K</mi> </msub> <mo>=</mo> <msup> <mrow> <mo>(</mo> <msubsup> <mi>R</mi> <msub> <mi>N</mi> <mi>i</mi> </msub> <mi>l</mi> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>lKT</mi> </msubsup> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>lK</mi> </msubsup> <mo>)</mo> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>lKT</mi> </msubsup> <mo>.</mo> </mrow> </math>

where multiple receive antennas are employed, the rows of the interference cancellation matrix may be expanded:

<math> <mrow> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>K</mi> </msubsup> <mo>=</mo> <msup> <mrow> <mo>[</mo> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mrow> <mn>1</mn> <mi>K</mi> </mrow> </msubsup> <mo>,</mo> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mrow> <mn>2</mn> <mi>K</mi> </mrow> </msubsup> <mo>,</mo> <mo>&CenterDot;</mo> <mo>&CenterDot;</mo> <mo>&CenterDot;</mo> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>LK</mi> </msubsup> <mo>]</mo> </mrow> <mi>T</mi> </msup> <mo>.</mo> </mrow> </math>

if the transmitting end adopts a multi-antenna transmit diversity transmission mode (for example, the transmission mode of 2 transmitting antennas shown in fig. 3), taking a 2 transmitting antenna system as an example, and combining the transmission diversity and the PCFICH channel scheme, the received signal model can be reconstructed as follows:

$\left[\begin{array}{c}{Y}_{1\_1}^l\\ {\left(Y_{2\_1}^l\right)}^{*}\\ Y_{1\_2}^l\\ {\left(Y_{2\_2}^l\right)}^{*}\\ Y_{1\_3}^l\\ {\left(Y_{2\_3}^l\right)}^{*}\\ Y_{1\_4}^l\\ {\left(Y_{2\_4}^l\right)}^{*}\end{array}\right]=\left[\begin{array}{cccccccccc}{H}_{11\_1}^{l1}& -H_{21\_1}^{l1}& H_{11\_1}^{l2}& H_{21\_1}^{l2}& 0& 0& H_{11\_1}^{l3}& H_{21\_1}^{l3}& 0& 0\\ {\left(H_{21\_1}^{l1}\right)}^{*}& {\left(H_{11\_1}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l2}\right)}^{*}& {\left(H_{22\_1}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l3}\right)}^{*}& {\left(H_{22\_1}^{l3}\right)}^{*}\\ H_{11\_2}^{l1}& -H_{21\_2}^{l1}& H_{11\_2}^{l2}& H_{21\_2}^{l2}& 0& 0& H_{11\_2}^{l3}& H_{21\_2}^{l3}& 0& 0\\ {\left(H_{21\_2}^{l1}\right)}^{*}& {\left(H_{11\_2}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l2}\right)}^{*}& {\left(H_{22\_2}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l3}\right)}^{*}& {\left(H_{22\_2}^{l3}\right)}^{*}\\ H_{11\_3}^{l1}& -H_{21\_3}^{l1}& H_{11\_3}^{l2}& H_{21\_3}^{l2}& 0& 0& H_{11\_3}^{l3}& H_{21\_3}^{l3}& 0& 0\\ {\left(H_{21\_3}^{l1}\right)}^{*}& {\left(H_{11\_3}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l2}\right)}^{*}& {\left(H_{22\_3}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l3}\right)}^{*}& {\left(H_{22\_3}^{l3}\right)}^{*}\\ H_{11\_4}^{l1}& -H_{21\_4}^{l1}& H_{11\_4}^{l2}& H_{21\_4}^{l2}& 0& 0& H_{11\_4}^{l3}& H_{21\_4}^{l3}& 0& 0\\ {\left(H_{21\_4}^{l1}\right)}^{*}& {\left(H_{11\_4}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_4}^{l2}\right)}^{*}& {\left(H_{22\_4}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_4}^{l3}\right)}^{*}& {\left(H_{22\_4}^{l3}\right)}^{*}\end{array}\right]\left[\begin{array}{c}{S}_1^{l1}\\ {\left(S_2^{l1}\right)}^{*}\\ S_{11}^{l2}\\ S_{21}^{l2}\\ {\left(S_{12}^{l2}\right)}^{*}\\ {\left(S_{22}^{12}\right)}^{*}\\ S_{11}^{l3}\\ S_{21}^{13}\\ {\left(S_{12}^{l3}\right)}^{*}\\ {\left(S_{22}^{13}\right)}^{*}\end{array}\right]+\left[\begin{array}{c}{N}_{1\_1}^l\\ N_{2\_1}^l\\ N_{1\_2}^l\\ N_{2\_2}^l\\ N_{1\_3}^l\\ N_{2\_3}^l\\ N_{1\_4}^l\\ N_{2\_4}^l\end{array}\right],$

wherein,data representing sequence number i in the repeated data block j received by antenna l,representing the channel estimation corresponding to the data received by the antenna l from the base station k, the transmitting antenna n, the repeated data block j and the sequence number i,refers to the signal received on antenna l from base station k with serial number iThe number of the mobile station is,representing gaussian noise corresponding to data of sequence number i in repeated data block j received by antenna l, at this time, the corresponding interference elimination matrix can be represented as:

<math> <mrow> <msubsup> <mover> <mi>&Omega;</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>lK</mi> </msubsup> <mo>=</mo> <mfenced open='[' close=']'> <mtable> <mtr> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <mo>-</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>1</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> </mtr> <mtr> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <mo>-</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>2</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> </mtr> <mtr> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <mo>-</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>3</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> </mtr> <mtr> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <mo>-</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>21</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>11</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>1</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>2</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>12</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> <mtd> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mn>22</mn> <mo>_</mo> <mn>4</mn> </mrow> <mrow> <mi>l</mi> <mn>3</mn> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>*</mo> </msup> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow> </math>

in particular, an interference cancellation matrix is constructedThen, the dimensionality of an interference elimination matrix can be determined according to a preset precoding scheme, the number of transmitting antennas of a transmitting party, the number of receiving antennas of a receiving party, the number of times of repeated processing on data subjected to precoding processing and the number of interference base stations; and for each channel element in the spatial channel matrix, determining a row sequence number of the channel element in the interference cancellation matrix according to the sequence number of the receiving antenna, the sequence number of the transmitting antenna, the sequence number of the repeated processing and a predetermined precoding scheme of the channel element, and determining a column sequence number of the channel element in the interference cancellation matrix according to the base station sequence number of the channel element, the sequence number of the transmitting antenna and the predetermined precoding scheme.

It should be noted that the interference cancellation matrix given hereAs a specific example only, the interference cancellation moment described aboveThe structure of the array is changed, and after the changed interference elimination matrix is used for subsequent processing, the purpose of reducing the cell edge interference can be achieved; in addition, on the premise of meeting the calculation requirement of eliminating the transmission data of the interference base station, the position change or position exchange can be carried out on part of channel elements in the interference elimination matrix, and correspondingly, the expressions of other parts in the received signal model can also be changed correspondingly; in addition, for 4-antenna transmission and reception and other cases with a large number of antennas, corresponding adjustment and change can be performed to obtain an interference cancellation matrix, and specific transformation modes are not listed in this document.

Suppose thatIs a known noise variance matrix that can be estimated using the MMSE estimation criterion $S_i^K:$ $\left[\begin{array}{c}{\hat{S}}_i^1\\ {\hat{S}}_i^2\\ .\\ .\\ .\\ {\hat{S}}_i^K\end{array}\right]=W_K\left[\begin{array}{c}{Y}_{1\_1}^l\\ {\left(Y_{2\_1}^l\right)}^{*}\\ Y_{1\_2}^l\\ {\left(Y_{2\_2}^l\right)}^{*}\\ Y_{1\_3}^l\\ {\left(Y_{2\_3}^l\right)}^{*}\\ Y_{1\_4}^l\\ {\left(Y_{2\_4}^l\right)}^{*}\end{array}\right],$

Wherein,for multiple receive antennas, the rows of the interference cancellation matrix may be expanded:

for the receiving end, if N is larger than or equal to K, the interference elimination matrix is a Full Rank (Full Rank) matrix, and N is the repetition times of the data block. The full rank of the interference cancellation matrix ensures that the estimate can be correctly based on different criteria

Desired signalAfter the processing such as de-layer mapping, QPSK demodulation, and decoding for the (3, 2) simplex code (i.e., the inverse processing of the processing such as scrambling, modulation, and encoding performed by the transmitting end), CFI information can be obtained, and the position of the control channel can be known according to the CFI.

The process of the reference signal mapping location reservation will be described below.

To achieve better interference cancellation at LTE PCFICH, the terminal needs to estimate the channel responses from multiple cells more accurately. In order to achieve reliability of multi-cell channel estimation, mapping location reservation may be performed on Reference Signals (RS). Fig. 5 is a schematic diagram of mapping of PCFICH signals, reference signals, and service data signals in an LTE downlink slot, and fig. 5 shows distribution of the PCFICH signals, reference signals, and service data of 3 base stations. The PCFICH signals and the reference signals of the base stations 1, 2 and 3 are orthogonal in the frequency domain and do not interfere with each other. However, in a cell edge region, if users in different cells use the same spectrum resource, downlink data signals have serious mutual interference, and the users receive signals from different base stations in the same spectrum resource, at this time, a signal-to-interference ratio (SIR) is usually lower than 0dB, and accordingly, PCFICH signals are also interfered by other control channels of other base stations, and reference signals are interfered by data signals from different base stations, thereby seriously reducing reliability of channel estimation. In order to improve the effect of interference cancellation, so that signals from different base stations can be demodulated correctly, the transmitting ends of neighboring base stations all need to use the above-mentioned transmission scheme (for example, the transmission schemes shown in fig. 2 and fig. 3, and the specific process may refer to step S101 to step S109 of fig. 1), and the known positions to be mapped by reference signals of these interfering base stations are reserved, so as to ensure that users can separate the reference signals of different base stations for channel estimation. Therefore, the position of the reference signal shown in fig. 5 will not map the traffic data signal any more, thereby improving the effect of channel estimation and thus the effect of interference cancellation.

Fig. 6 is a diagram illustrating a packet error rate comparison between a transmission scheme using the PCFICH according to the present embodiment and a transmission scheme using a conventional PCFICH in a cell edge strong interference environment. In fig. 6, the abscissa represents the signal-to-noise ratio (SNR), i.e., the ratio of the signal to gaussian noise, and the ordinate represents the packet error rate (BLER). The SIR represents the power ratio between the serving base station and the two adjacent interfering base stations, and the SIR ═ 0dB represents that the power ratio between the serving base station and the two adjacent interfering base stations is 0dB, that is, the power of the three base stations is the same, which represents that strong interference exists in the current environment. The conditions on which the simulation is based are: LTE normal cyclic prefix, FDD duplex, ideal channel estimation. As can be seen from the simulation results shown in fig. 6, in the case of strong interference at the cell edge, if the conventional PCFICH transmission scheme is adopted, no matter in the single-antenna mode or the multi-antenna transmission diversity mode, as long as the PCFICH is interfered by other control channels from other base stations, the packet error rate is always maintained above 10%, and even if the signal-to-noise ratio is increased, the packet error rate curve still has no trend of decreasing, so that if the conventional PCFICH transmission scheme is adopted, a high-probability misjudgment may bring much overhead and delay to the system; however, if the PCFICH transmission scheme proposed in this embodiment is adopted, the packet error rate can be reduced to below 1% in both the single antenna mode and the multi-antenna transmission diversity mode, which can obviously eliminate the interference from other base stations, and reduce the system overhead and delay.

Fig. 7 is a diagram for comparing packet error rates of a transmission scheme using the PCFICH according to the present embodiment with a conventional PDCCH transmission scheme in a non-interference environment. The simulation conditions shown in fig. 7 are: as shown in fig. 7, in the case of no interference, if the PCFICH transmission scheme provided in this embodiment is adopted, the packet error rate is also close to the packet error rate when the conventional PCFICH transmission scheme is adopted in the single-antenna mode and the multi-antenna transmission diversity mode, that is, after the PCFICH scheme according to this embodiment is adopted, it can be effectively ensured that the performance of the cell center is not affected.

It should be noted that although the LTE system is described as an example, the present invention is not limited to this, and the foregoing processing of the present embodiment may also be adopted for the purpose of interference cancellation for channels in other communication systems (e.g., LTE-Advanced system, etc.) that transmit physical control format indications.

By means of the processing, the physical control format indication is coded, modulated, precoded, processed repeatedly and sent, and an interference elimination matrix based on a precoding scheme is constructed at a receiver, so that the interference of other base stations to a physical control format indication channel of a service base station can be effectively eliminated on the premise of not influencing the performance of a cell center and changing the original system as little as possible, the receiver can correctly detect and acquire the physical control format indication, the downlink control channel can be correctly detected, the problem that the physical control format indication cannot be correctly detected due to the interference is avoided, the data delay and the system overhead generated when the physical control format indication is retransmitted by the system are further avoided, and the FICPCH can still be correctly decoded by the receiver under the condition that the signal-to-interference ratio is lower than 0 dB.

According to the embodiment of the invention, a transmission system of the physical control format indication channel is also provided, and the system is used for realizing the transmission of at least one antenna and the reception of at least one antenna of the physical control format indication channel.

As shown in fig. 8, the transmission system of the physical control format indicator channel according to the embodiment of the present invention includes a transmitting device 81 and a receiving device 82.

Specifically, the transmission device 81 includes: the encoding module 811 is configured to perform a simplex code encoding process on the physical control format indicator according to a predetermined encoding rate; a modulation module 812, configured to modulate the encoded data according to a predetermined modulation scheme; a precoding module 813, configured to perform precoding processing on the modulated data according to a predetermined precoding scheme; a repeating module 814, configured to repeat the data of each transmitting antenna after precoding, where the number of times of the repeated processing, the coding rate, and the modulation order of the modulation mode are determined by a resource mapping length of a physical control format indicator channel and a length indicated by the physical control format; a mapping module 815, configured to map, for each transmitting antenna, the reference signal and the data obtained after the repeated processing to a physical resource block of the transmitting antenna according to a resource mapping scheme of a predetermined physical control format indicator channel; at least one transmit antenna 816 for transmitting the mapped data and reference signals;

the receiving device 82 includes: at least one receiving antenna 821, wherein each receiving antenna performs resource extraction of the physical control format indicator channel on the data and the reference signal received by the receiving antenna according to a predetermined resource mapping scheme of the physical control format indicator channel, and is used for calculating a spatial channel vector from a serving base station to which the receiving device belongs and an interfering base station to the receiving antenna according to the reference signal obtained by resource extraction of the physical control format indicator channel; a constructing module 822, configured to obtain a spatial channel matrix of a physical control format indicator channel according to spatial channel vectors from a serving base station and all or part of receiving antennas from an interfering base station to a receiving apparatus, and construct an interference cancellation matrix of the physical control format indicator channel based on a predetermined precoding scheme adopted by the sending apparatus according to the spatial channel matrix of the physical control format indicator channel, where the interference cancellation matrix of the physical control format indicator channel is obtained by modeling according to the predetermined precoding scheme, transmitting antennas, receiving antennas, repetition processing, the serving base station, and the interfering base station; the eliminating module 823 is configured to eliminate data sent by the interfering base station according to the interference elimination matrix of the physical control format indicator channel and a predetermined detection criterion, and obtain a physical control format indicator according to a predetermined modulation scheme and inverse processing of the simplex code coding processing.

In summary, with the above technical solutions of the present invention, by encoding, modulating, pre-coding, repeatedly processing and sending the physical control format indicator, and constructing the interference elimination matrix based on the pre-coding scheme on the receiving side, the interference of other base stations on the physical control format indicator channel of the serving base station can be effectively eliminated on the premise that the performance of the cell center is not affected and the original system is changed as little as possible, so that the receiver can correctly detect and acquire the physical control format indication, avoid the problem that the physical control format indication cannot be correctly detected due to interference, contribute to correctly detecting the downlink control channel, thereby avoiding the data delay and system overhead generated when the system retransmits the physical control format indication, so that the receiving side can still correctly decode the PCFICH under the condition that the signal-to-interference ratio is lower than 0 dB.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for transmitting a physical control format indicator channel, which is used for realizing transmission of at least one antenna and reception of at least one antenna of the physical control format indicator channel, the method comprising:

the sender carries out simplex code coding processing on the physical control format indication according to a preset coding rate;

the sender modulates the data obtained after coding according to a preset modulation mode;

the sender carries out precoding processing on the modulated data according to a preset precoding scheme;

the sender repeatedly processes the data of each transmitting antenna after precoding, wherein the times of repeated processing, the coding rate and the modulation order of the modulation mode are determined by the resource mapping length of a physical control format indication channel and the length indicated by the physical control format;

for each transmitting antenna, the sender maps the reference signal and the data obtained after repeated processing to a physical resource block of the transmitting antenna according to a resource mapping scheme of a preset physical control format indication channel, and sends the mapped data and reference signal;

each receiving antenna of the receiver extracts the resources of the physical control format indication channel from the received data and the reference signal according to the resource mapping scheme of the predetermined physical control format indication channel;

each receiving antenna calculates a space channel vector from a service base station to which the receiving party belongs and an interference base station to the receiving party according to a reference signal obtained by extracting resources of a physical control format indication channel, and obtains a space channel matrix of the physical control format indication channel according to the space channel vectors from the service base station and the interference base station to all or part of the receiving antennas of the receiving party;

the receiver constructs an interference elimination matrix of the physical control format indication channel based on the preset precoding scheme according to the spatial channel matrix of the physical control format indication channel, wherein the interference elimination matrix of the physical control format indication channel is obtained by modeling according to the preset precoding scheme, a transmitting antenna, a receiving antenna, repeated processing, a service base station and an interference base station;

the receiver eliminates the data sent by the interference base station according to the interference elimination matrix of the physical control format indication channel and a preset detection criterion, and obtains the physical control format indication according to the preset modulation mode and the inverse processing of the simplex code coding processing;

the number of times of repeated processing N, the coding rate R, the modulation order M of the modulation mode, the resource mapping length O of the physical control format indication channel and the length I of the physical control format indication satisfy the following conditions:

<math> <mrow> <mi>O</mi> <mo>=</mo> <mfrac> <mrow> <mi>I</mi> <mo>&CenterDot;</mo> <mi>N</mi> </mrow> <mrow> <mi>R</mi> <mo>&CenterDot;</mo> <mi>M</mi> </mrow> </mfrac> <mo>;</mo> </mrow> </math>

wherein constructing an interference cancellation matrix based on the predetermined precoding scheme comprises:

determining the dimensionality of an interference elimination matrix of the physical control format indication channel according to the preset precoding scheme, the number of transmitting antennas of the transmitting party, the number of receiving antennas of the receiving party, the number of times of repeated processing on precoded data and the number of the interference base stations; and

for each channel element in the spatial channel matrix, determining a first dimension sequence number of the channel element in the interference elimination matrix according to a sequence number of a receiving antenna, a sequence number of a transmitting antenna, a sequence number of repeated processing and the predetermined precoding scheme of the channel element, and determining a second dimension sequence number of the channel element in the interference elimination matrix according to a base station sequence number of the channel element, a sequence number of the transmitting antenna and the predetermined precoding scheme.

2. The transmission method according to claim 1, wherein obtaining the spatial channel matrix of the physical control format indicator channel according to the spatial channel vectors of all or part of receiving antennas from the serving base station and the interfering base station to the receiving party comprises:

each receiving antenna separates and estimates the reference signals of the service base station and the interference base station obtained by extracting the resources of the physical control format indication channel to obtain the physical channels from all transmitting antennas to the receiving antennas of the receiving party, and the estimated physical channels are arranged according to a repeated processing mode to form a space channel vector corresponding to the receiving antenna;

and the receiving party arranges all or part of the space channel vectors corresponding to the receiving antennas according to the serial numbers of the receiving antennas to form a space channel matrix of the physical control format indication channel.

3. The transmission method according to claim 2, wherein before mapping the reference signals and the data obtained after the repeated processing to the physical resource blocks of the transmitting antennas, the method further comprises:

interweaving the data after the repeated processing according to a preset interweaving scheme, and taking the interweaved data as the data to be mapped;

and, the performing, by each receiving antenna, resource extraction of the physical control format indicator channel on the respective received data and reference signals according to the resource mapping scheme of the predetermined physical control format indicator channel includes: the receiving party extracts the resources of the received data and inversely interleaves the data extracted by the resources according to the preset interleaving scheme;

and, before the receiving side arranges the physical channels estimated by each receiving antenna according to a repetition processing manner, the method further includes: and performing reverse interleaving on the estimated physical channel according to the predetermined interleaving scheme.

4. The transmission method according to claim 3, further comprising:

and according to the number of the interference base stations, the number N of times of repeated processing of the data after the pre-coding processing is predetermined, wherein N is more than or equal to B +1, and B is the number of the interference base stations.

5. The transmission method according to claim 1, wherein mapping the reference signal and the data obtained after the repeated processing to the physical resource block of the transmitting antenna comprises:

dividing the data obtained after repeated processing into four data groups;

determining the frequency domain starting positions of the four data groups to be mapped according to the following formula:

<math> <mrow> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>=</mo> <mover> <mi>k</mi> <mo>&OverBar;</mo> </mover> </mrow> </math>

wherein k is₁A frequency domain starting position for data mapping of the first data group; k is a radical of₂A frequency domain start position mapped for data of the second data group; k is a radical of₃A frequency domain start position for data mapping of the third data group; k is a radical of₄A frequency domain start position mapped for data of the fourth data group;is a predetermined frequency domain starting position;the number of physical resource blocks corresponding to the downlink bandwidth,the number of sub-carriers corresponding to each physical resource block。

6. The transmission method according to claim 1, wherein before the sender maps the data obtained after the repeated processing to the physical resource blocks of the transmitting antennas, the method further comprises:

and the sender reserves resource positions required to be mapped by the reference signals of the serving base station and the interference base station according to the resource mapping scheme of the predetermined physical control format indication channel, wherein the reserved resource positions are only used for mapping the reference signals in the mapping process.

7. The transmission method according to any one of claims 1 to 6, wherein in the case where the sender performs physical control format indicator channel transmission using a single transmit antenna, the predetermined precoding scheme is a single antenna transmission scheme; and under the condition that the transmitting party utilizes a plurality of transmitting antennas to transmit the physical control format indication channel, the preset precoding scheme is a transmission diversity transmission scheme.

8. Transmission method according to any of claims 1 to 6, characterized in that said predetermined detection criterion comprises one of the following: maximum likelihood, minimum mean square error, least squares method.

9. A transmission system of a physical control format indicator channel for enabling transmission of at least one antenna and reception of at least one antenna of the physical control format indicator channel, characterized in that the system comprises transmitting means and receiving means, wherein,

the transmission apparatus includes:

the encoding module is used for carrying out simplex code encoding processing on the physical control format indication according to a preset encoding rate;

the modulation module is used for modulating the data obtained after coding according to a preset modulation mode;

the pre-coding module is used for pre-coding the modulated data according to a preset pre-coding scheme;

a repeating module, configured to repeat processing on data of each transmit antenna after precoding processing, where a number of times of the repeated processing, the coding rate, and a modulation order of the modulation scheme are determined by a resource mapping length of a physical control format indicator channel and a length indicated by the physical control format;

a mapping module, configured to map, for each transmit antenna, the reference signal and the data obtained after the repeated processing to a physical resource block of the transmit antenna according to a resource mapping scheme of a predetermined physical control format indicator channel;

at least one transmitting antenna for transmitting the mapped data and reference signals;

the receiving apparatus includes:

at least one receiving antenna, wherein each receiving antenna performs resource extraction of a physical control format indicator channel on data and reference signals received by the receiving antenna according to the resource mapping scheme of the predetermined physical control format indicator channel, and is used for calculating a spatial channel vector from a serving base station to which the receiving device belongs and an interference base station to the receiving antenna of the receiving device according to the reference signals obtained by resource extraction of the physical control format indicator channel;

a constructing module, configured to obtain a spatial channel matrix of a physical control format indicator channel according to spatial channel vectors from the serving base station and all or part of receiving antennas from an interfering base station to a receiving apparatus, and construct an interference cancellation matrix of the physical control format indicator channel based on the predetermined precoding scheme according to the spatial channel matrix of the physical control format indicator channel, where the interference cancellation matrix of the physical control format indicator channel is obtained by modeling according to the predetermined precoding scheme, transmitting antennas, receiving antennas, repetition processing, the serving base station, and the interfering base station;

a cancellation module, configured to cancel data sent by the interfering base station according to an interference cancellation matrix of the physical control format indicator channel and a predetermined detection criterion, and obtain the physical control format indicator according to the predetermined modulation scheme and an inverse process of the simplex code coding process;

the number of times of repeated processing N, the coding rate R, the modulation order M of the modulation mode, the resource mapping length O of the physical control format indication channel and the length I of the physical control format indication satisfy the following conditions:

<math> <mrow> <mi>O</mi> <mo>=</mo> <mfrac> <mrow> <mi>I</mi> <mo>&CenterDot;</mo> <mi>N</mi> </mrow> <mrow> <mi>R</mi> <mo>&CenterDot;</mo> <mi>M</mi> </mrow> </mfrac> <mo>;</mo> </mrow> </math>

wherein constructing an interference cancellation matrix based on the predetermined precoding scheme comprises:

determining the dimensionality of an interference elimination matrix of the physical control format indication channel according to the preset precoding scheme, the number of transmitting antennas of the transmitting party, the number of receiving antennas of the receiving party, the number of times of repeated processing on precoded data and the number of the interference base stations; and

for each channel element in the spatial channel matrix, determining a first dimension sequence number of the channel element in the interference elimination matrix according to a sequence number of a receiving antenna, a sequence number of a transmitting antenna, a sequence number of repeated processing and the predetermined precoding scheme of the channel element, and determining a second dimension sequence number of the channel element in the interference elimination matrix according to a base station sequence number of the channel element, a sequence number of the transmitting antenna and the predetermined precoding scheme.

10. A receiving apparatus of a physical control format indicator channel, configured to implement reception of at least one antenna of the physical control format indicator channel, the receiving apparatus comprising:

at least one receiving antenna, wherein each receiving antenna performs resource extraction of a physical control format indicator channel on data and reference signals received by the receiving antenna according to the resource mapping scheme of the predetermined physical control format indicator channel, and is used for calculating a spatial channel vector from a serving base station to which the receiving device belongs and an interference base station to the receiving antenna of the receiving device according to the reference signals obtained by resource extraction of the physical control format indicator channel;

a constructing module, configured to obtain a spatial channel matrix of a physical control format indicator channel according to spatial channel vectors of all or part of receiving antennas from the serving base station and the interfering base station to the receiving apparatus, and construct an interference cancellation matrix of the physical control format indicator channel based on a predetermined precoding scheme adopted by the sending apparatus according to the spatial channel matrix of the physical control format indicator channel, where the interference cancellation matrix of the physical control format indicator channel is obtained by modeling according to the predetermined precoding scheme, the transmitting antenna, the receiving antenna, the repeat processing, the serving base station, and the interfering base station;

a cancellation module, configured to cancel data sent by the interfering base station according to an interference cancellation matrix of the physical control format indicator channel and a predetermined detection criterion, and obtain the physical control format indicator according to the predetermined modulation scheme and an inverse process of the simplex code coding process;

wherein constructing an interference cancellation matrix based on the predetermined precoding scheme comprises:

determining the dimensionality of an interference elimination matrix of the physical control format indication channel according to the preset precoding scheme, the number of transmitting antennas of the transmitting party, the number of receiving antennas of the receiving party, the number of times of repeated processing on precoded data and the number of the interference base stations; and

for each channel element in the spatial channel matrix, determining a first dimension sequence number of the channel element in the interference elimination matrix according to a sequence number of a receiving antenna, a sequence number of a transmitting antenna, a sequence number of repeated processing and the predetermined precoding scheme of the channel element, and determining a second dimension sequence number of the channel element in the interference elimination matrix according to a base station sequence number of the channel element, a sequence number of the transmitting antenna and the predetermined precoding scheme.