WO2008083619A1 - A communication method for mimo multiple code words - Google Patents

Abstract

A communication method for MIMO multiple code words is used in a MIMO system. The method includes the following steps: the transmitting terminal of the MIMO system has M transmitting antennas, K transmitting antennas of which transmit K data streams; each route of K data streams respectively performs channel encoding independently, in a period of each symbol in a TTI, at least one route of the K data steams by turns uses each antenna of the K transmitting antennas for transmitting (S20); the receiving terminal of the MIMO system uses the detecting technique of interference elimination for receiving (S30); and the combination of one or more antennas varies at least one time in company with different symbol period, the combination of one or more antennas is used for transmitting the symbols of one or more data streams, which still form interference to the symbol of one data stream when the interference is not eliminated through interference elimination technique, thereby interference diversity is realized.

Description

 M1M0 multi-codeword communication method

Technical field

 The invention relates to the field of communication, and is more compact and related to the improvement of MIMO (Multiple Code Word, abbreviated as MCW) scheme of MIMO (Mult Iple-Input Multiple-Output) communication technology. BACKGROUND OF THE INVENTION,...

 - According to the information theory, the use of multiple antenna arrays at the transmitting and receiving ends of the communication system or both can significantly increase the transmission bit rate.

 Fig. 1 is a schematic diagram showing a wireless communication system having a 3⁄4 _ architecture at the same time at the transmitting end and the receiving end. The system Ί: In the Rayleigh scattering environment, the elements of the channel matrix can be approximated as statistically independent.

 In the system of Figure 1, a data sequence is divided into M uncorrelated symbol subsequences, each subsequence being transmitted by one of the M transmit antennas. The M subsequences are received by the N receiving antennas at the receiving end after being influenced by a channel whose channel matrix is H. The transmitted signal, ···, 3⁄4^ are respectively transmitted through M different antenna units a-l,..., a-M, corresponding receiving signals c

J _{W is} received from N different antenna elements b-1, ···, bN, respectively.

In the child system, the number of transmitting antenna units M is at least 2, and the number N of receiving antenna units is at least M. The channel matrix H is a matrix of ΝχΜ, and the elements of the i-th row and the j-column in the matrix represent the coupling of the i-th receiving antenna and the j-th transmitting antenna through the transmission channel. The received signals χ, , ···, ^ are processed in the digital signal processor to produce a recovered transmitted signal, S _M . The figure also shows the summation components c 1, c-2, ..., c- N, which represent the unavoidable noise signals w ₂ , ···, w _N , which are respectively added to the receiving antenna unit. B-1, b-2, ..., bN are received in the signal.

 In general, the mathematical expressions for signal transmission and reception are as follows:

( 1 )

 The 3GPP2 AIE Standardized Organization White Paper C30-20060731-040_HKLLMNQRSUZ_PP2Phase2_FDD_Proposal_vl. 9 (Joint Proposal for 3GPP2 Physical Layer for FDD Spectra) on July 31, 2006 introduces a MIM0 multi-codeword (MCW) communication scheme. In MIM0's MCW communication scheme, there are multiple transmit signals, each with its own independent Turbo coding scheme. For the multi-codeword mode, the receiver can use the interference cancellation technique to obtain a large gain, so the multi-codeword mode usually uses a nonlinear receiver with interference cancellation. The receiving end first decodes the transmitted signal according to the received signal. After decoding, it determines whether the decoding of the signal is correct according to the check bit. If it is correct, the decoded result is used to eliminate the correct decoding of the path from the received signal. The effect of the transmitted signal, and then based on the elimination of the affected received signal, Turbo decodes the other transmitted signal; thus iteratively performs the above steps until all of the multiplexed signals are decoded.

In the multi-codeword mode communication scheme described in the white paper of the AIE Standardization Organization, the transmitting end uses multiple virtual antenna ports to the receiving end. Launch a letter. The above-mentioned virtual large line refers to the left side of the column direction of the transmission signal, multiplied by a matrix, and then sent to each physical antenna for transmission. Correspondingly, each of the transmitted signals is multiplied by a column in the matrix, and each of the obtained results is sent to each physical large line, which is called the transmitted signal is transmitted through a virtual large line, and the virtual large line is described. , quite a wave of space 3⁄4.

 The multi-codeword mode communication scheme can also be used simultaneously with the MIM0顸 encoding technique. An existing MIM0 precoding technical scheme and a precoding matrix design scheme define a plurality of precoding matrices, and the receiving end feeds back the sequence number of an optimal precoding matrix, and the transmitting end makes HJ the precoding matrix, The transmitted signal is precoded and then sent to each virtual antenna or physical large line to transmit. It is assumed that the transmitted signal is precoded and then sent to each physical antenna for transmission. The mathematical expression of the signal transmission and reception represented by the W!j expression (1) becomes:

In the above expression, t,, , ..., t _K are signals transmitted to the physical antenna, and the vector of the actual transmitted signals _S1 , s ₂ , - is multiplied by the precoding matrix to obtain t, t ₂ , ···, sent to the physical antenna launch, the corresponding mathematical expression is as follows:

 In the above-described ΜΙΜΟ precoding technique, the left side of the column vector composed of the transmitted signals is multiplied by a matrix, and then transmitted to each physical semaphore or virtual antenna for transmission. Correspondingly, each transmitted signal is multiplied by a column in the matrix, and each obtained result is sent to each physical antenna or virtual antenna respectively, and this is called the transmitted signal is transmitted through one layer, the first layer, Equivalent to a beam of space.

 As described above, the multiple data streams of the multi-codeword mode communication scheme can be transmitted through multiple virtual antennas, or multiple physical antennas, or multiple layers in precoding techniques.

 The details of the multi-codeword mode communication scheme described in the white paper of the 3GPP2() LMB) standardization organization are described in detail below, and the scheme can be used in the MIM0 system shown in FIG. In the multi-codeword mode, the transmitting end transmits signals to the receiving end by using one virtual antenna port, and the Μ is greater than or equal to 2 and less than or equal to 4. On a plurality of virtual transmitting antennas, each time a 数据 (Κ小丁为 Μ) road-coded data stream is transmitted, and each of the Κ-way data streams is distributed to each virtual transmitting line.

In the ΜΙΜ0 technology, in order to transmit data more efficiently, it is necessary to control the data rate of the transmitting end, and tell the transmitting end whether the data of each channel is correctly decoded by the receiving end. In each ΊΤΙ (Transition Time Interval), The receiving end feeds back K CQI (channel quality. 3⁄4 indication) information and K ACK/NAC letters, and the 屮CQT information tells the transmitting end what is encoded in each corresponding one of the 'ΠΊ transmission paths. The MCS (The Modulation Channel Coding Scheme), and the ACK/MCK information tells the transmitting end whether each encoded data in the K channel of the corresponding TTI transmission has been received. The end is indeed decoded.

 Here is the concept of TTI described above. In order to combat channel fading, and transmission errors caused by channel interference and noise, the transmitting end divides the data to be transmitted into multiple data packets (Block), and performs channel coding and interleaving of information bits in the same data packet. The modulation is then modulated into multiple symbols over the channel, and the length of time required to transmit such a packet determines the length of a TTI. The receiving end first receives all the symbols contained in the same data packet, and then deinterleaves and decodes. In the present invention, a TTI refers to the time interval at which such a packet is transmitted.

 And each symbol in a data packet transmitted in a TTI may be distributed in different intervals in the time domain, and the distributors are distributed in different intervals in the frequency domain, or distributed on a two-dimensional plane in the time domain and the frequency domain. Different intervals. One symbol period described below refers to an interval occupied by a symbol transmitted through a channel in the time domain, or an interval occupied in the frequency domain, or between two occupied in a time domain and a frequency domain. For example, one of the MIM0 OFDM (Orthogonal Frequency Division Mult Iplexing) communication schemes described in the IEEE 802.20 standard 2006-01-06, T BFDD and MBTDD: Proposed Draft Air Interface Specific The data packet uses eight consecutive 0FDM symbols in the time domain, and each 0FDM symbol occupies 16 consecutive subcarriers in the frequency domain of the fff, then one symbol period refers to a space on the two-dimensional plane of the time domain and the frequency domain. It is 1 subcarrier on 1 OFDM symbol in the time domain, and this packet has 8 X 16=128 symbol periods.

 In the MCW mode, the receiving end feeds back K (K is less than or equal to M) CQIs, respectively indicating the MCS of the K-coded data stream. There are also two options for the MCW mode:

 1. Solution A: Each channel in the K-coded data stream is fixed to a virtual antenna or physical antenna for transmission.

2. Option B: Each path in the K-way data stream is transmitted through all K virtual antennas or physical antennas selected for use, that is, the road uses this large line in one symbol period, and the next symbol period uses another. Antenna, in this way, each way traverses all the big lines.

In the proposal submitted by a company to the 3GPP2 AIE standardization organization, the superiority of the scheme B is illustrated by the comparison between the scheme A and the scheme B. In schemes A and B, if a, b, c, and d respectively represent data streams independently encoded by K=4 channels, and it is assumed that the four channels of data are detected in the order of a, b, c, and d. That is to say, the receiving end first decodes the data stream a according to the received signal, and if the decoding is correct, the result of the decoding is used to eliminate the influence of the transmitted signal of the data stream a on the detected subsequent data stream from the received signal; Decoding the affected received signal, decoding the data stream b, if the decoding is correct, using the decoded result, and eliminating the influence of the transmitted signal of the data stream b on detecting the subsequent data stream from the received signal; After the affected received signal, the decoded data stream c, if the decoding is correct, uses the decoded result, and then removes the influence of the transmitted signal of the data stream c on the detected subsequent data stream from the received signal; finally, the influence is eliminated according to the description. After the received signal, the data stream d is decoded. In the diagram below, each row of the matrix represents a virtual antenna, or a physical antenna, or a layer in a precoding technique. Lines 1, 2, 3, and 4 of the matrix are recorded as antennas 1, 2, 3, and 4, respectively. The columns of the matrix represent different symbol periods, and the two columns adjacent to the matrix, the corresponding two symbol periods are usually adjacent in the frequency domain or the time domain, at least, the two columns adjacent to the matrix correspond to The channel conditions of the two symbol periods vary little and are similar. The columns of the matrix below represent each of the 0FDM communication systems Different subcarriers, adjacent | columns, correspond to two adjacent 亍 carriers.

 The schematic diagram is as follows:

 Every day, every day

 Scheme ϊ line line 3⁄4 A diagram:

 1: a a a a a a a a a a a a a

 2: b b b b b b b b b b b b

 3: c c c c c c c c c c c c

 4: d d d d d d d d d d d d d

 As shown in the above figure, in scheme A, each of data streams a, b, c, and d is transmitted by a large transmission line.

 Scheme B schematic diagram:

 Antenna 1 : a d c b a d c b a d c b

 Antenna 2: b a d c b a d c b a d c

 Antenna 3- c b a d c b a d c b a d

 Antenna 4: d c b a d c b a d c b a As shown in the above figure, in scenario B, the individual symbols of data streams a, b, c, d are cyclically transmitted using individual sigma lines. That is, on a certain subcarrier, the symbols of the data streams a, b, c, and d are respectively transmitted by the antennas 1, 2, 3, and 4; in the immediately adjacent subcarrier, the symbols are the symbols of the data streams d, a, b, and c. Emitted by antennas 1, 2, 3, 4 respectively; in the immediately adjacent subcarrier, the symbols recirculated as data streams <;, d, a, b are respectively transmitted by antennas 1, 2, 3, 4; The next subcarrier, the symbol of the data stream b, c, d, a is transmitted by the antennas 1, 2, 3, 4, respectively, thereby completing one cycle, so that the next subcarrier is again from the data stream a, b The symbols of c, d, respectively, start a new cycle by the case of antennas 1, 2, 3, and 4. From the diagonal of the matrix, each diagonal is occupied by the individual symbols of the same data stream.

 It can be seen that with the change of the MM0 channel, the instantaneous channel capacity (ie, instantaneous data throughput rate) of each data stream in each MCT mode changes with time, and compared with the scheme B with loop, there is no scheme under the loop. The variance of the instantaneous channel capacity variation of the data stream is large. At the same time, under scenario A and scenario B, the mean values of the instantaneous channel capacities of the data streams are the same.

 In the MCW mode defined by the 3GPP2 AIE (UMB) standard, the receiving end feeds back K CQIs, and the CQI feedback erasure rate is relatively high, and the CQI feedback is erased in a typical channel environment. The probability is 50%. The so-called CQI feedback erasure probability means that the signal-to-noise ratio (SNK) of the CQI feedback is relatively low, and the transmitting end determines that the CQI currently fed back by the receiving end is unreliable, so that the current TTI does not determine the corresponding CQI according to the current feedback. The modulation and channel coding scheme adopted by the one-way data stream is based on the previously fed back CQI to estimate the current CQI to determine the modulation and channel coding scheme used by the corresponding one-way data stream. The current most suitable modulation and channel coding scheme is determined by the current instantaneous channel capacity. Compared with the scheme A, the variance of the instantaneous channel capacity variation of each data stream under scheme B is small, that is, the variance of the instantaneous optimal modulation and the channel coding scheme and the instantaneous CQI variation is small, so that the CQI feedback erasure occurs. According to the CQI of the previous feedback, it is estimated that the current CQI has a small error and the loss is small, so it is not difficult to see the advantage of the scheme B. The simulation results obtained by comparing the probability distribution maps of the instantaneous channel capacity of scheme A and scheme B are shown in Fig. 2.

In Fig. 2, the abscissa indicates the channel capacity, and the ordinate indicates the probability density function. It can be seen from the figure that Cycling's scheme has a more concentrated distribution of instantaneous channel capacity than Non Cycling's scheme A. Data analysis shows that the party of Cycling The case of the case of the 'instantaneous letter 逍3⁄4, is 76% smaller than the variance of the scheme of Non Cyc li ng's instantaneous letter 3⁄4荇^.

 / Ten: In the process of implementing the present invention, the inventors have found that: by adopting the method of MJ interference bifurcation, scheme B can be further improved, so that the instantaneous channel capacity distribution of some data streams can be more concentrated. Summary of the invention

 Embodiments of the present invention provide a MIM0 multi-codeword communication method, which aims to make the distribution of instantaneous channel capacity of some data streams more concentrated by adopting a method of interference diversity. .

 A MIM0 multi-codeword communication method using the T MIM0 system, comprising:

 The MIM0 system has M transmitting large lines at the transmitting end, and K transmitting data streams are transmitted by the K transmitting antennas;

 Each channel of the K-channel data stream is independently channel-encoded. At each symbol period of a transmission time interval TTI, at least one of the κ-channel data streams uses each of the κ transmit antennas in turn;

 Receiving, by the receiving end of the MIM0 system, an interference cancellation detection technology; and

 At the transmitting end, a combination of one or more antennas used for the transmission of one or more data streams whose interference is not cancelled by the receiving end by the interference cancellation technique and still interfere with the symbols of a certain data stream, Different symbol periods are changed at least once to achieve interference diversity.

 It can be seen from the above technical solutions that the following technical effects are achieved in the embodiments of the present invention:

 Through the adoption of interference diversity technology, the distribution of instantaneous channel capacity of the data stream can be more concentrated, thereby improving the performance of MIM0 multi-codeword communication.

 Other features and advantages of the embodiments of the present invention will be set forth in the description in the description. The advantages of S and other advantages of the embodiments of the present invention can be realized and obtained by the structure specified in the written description, the claims, and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

 The drawings are intended to provide a further understanding of the embodiments of the present invention, and are intended to be a part of the present invention. In the drawing:

 1 is a schematic diagram showing a wireless communication system having a space-time architecture using multiple antenna arrays at the transmitting end and the receiving end;

 2 is a comparison diagram showing simulation results of probability distributions of instantaneous channel capacities of schemes A and B;

 FIG. 3 is a flow chart showing a MIM0 multi-codeword communication method according to an embodiment of the present invention; FIG.

 4 is a comparison diagram showing simulation results of probability distribution of instantaneous channel capacity of an embodiment of the present invention and scheme B. Mode for carrying out the invention

An embodiment of the present invention provides a MIM0 multi-codeword communication method for a MIM0 system, including the following steps: MIM0 system has M transmit antennas at a transmitting end, and K transmit antennas are selected to transmit K-channel data streams; K-channel data Each channel of the stream is independently channel-coded. In each symbol period of a TTI, each of the K-channel data streams alternately uses the respective transmissions of the K transmission squall lines; The detection technology of the MIMO system receiving end of the Chuanchuan interference cancellation is collected:

 Wherein, in each symbol period of each TTI, each of the K-channel data streams alternately enables the transmission modes of the U K large-emission lines to satisfy the following conditions:

 Interference cancellation at the receiving end in each symbol period in which the arbitrarily determined one of the K transmit antennas (set as antenna i) transmits a symbol of an arbitrarily determined one of the K data streams (set as data stream X) After the detection technique eliminates the interference of one or more signals of the data stream that has been detected, the interference is not eliminated by the interference cancellation technique and still forms one or more data streams that interfere with the symbols of the data stream X. The combination of one or more antennas used for the symbol to be transmitted may vary with different symbol periods and change at least once, so that the effect of interference diversity can be achieved; specifically, the changes can be implemented in the following two ways:

 (1) Method 1: In the MIM0 multi-codeword communication method described above, one of the K-channel data streams is arbitrarily determined (set as the antenna m) to transmit an arbitrarily determined one-way data stream (set to Within each symbol period of the symbol of data stream X), its interference is not eliminated by the interference cancellation technique so that the symbol of one or more data streams that still interfere with the sign of the data stream X is transmitted using one or A combination of multiple antennas traverses all possible combinations, and each combination is used as many times as possible to achieve the best interference diversity effect.

 In the above MIM0 multi-codeword communication method, a method of achieving the above-described effect of optimal interference diversity may include:

Within the TTI, all possible permutations (i.e., arrangements of multiple antennas) of the correspondence between the data streams D1, D2, -Dk and antennas 1, 2 are traversed.

 In the above MIM0 multi-codeword communication method, the number of antennas is M=5, and the arrangement of traversal is 120; the number of antennas is M=4, and the arrangement of traversals is 24; the number of antennas is M=3, and the arrangement of traversals is six.

 In the above MIM0 multi-codeword communication method, a method of achieving the above-described effect of optimal interference diversity may further include: using the number of times of each arrangement as equal as possible within each symbol period within a TTI.

 (2) Method 2: The method provided by the embodiment of the present invention may also achieve the above-mentioned optimal interference diversity effect without traversing all possible permutations, but traverse less permutation (ie, partial arrangement) to achieve corresponding optimal interference diversity. Effect. In the above MIM0 multi-codeword communication method, the number of antennas is M=5, and the arrangement of traversal is 60; the number of antennas is M=4, and the arrangement of traversal is 12, which will be given in the following description. Select the specific implementation of the partial arrangement. This can make the implementation process much simpler, and at the same time, the number of times each of the permutations is used can be made equal in each symbol period within a TTI.

 It can be seen that, in the MIM0 system of the embodiment of the present invention, when M=3, the probability distribution of the instantaneous channel capacity of the second detected data stream b at the receiving end is more concentrated than that of the prior art scheme B; when M=4 The probability distribution of the instantaneous channel capacity of the second detected data stream b and the third detected data stream c at the receiving end is more concentrated than that of the prior art scheme B; when M=5, at the receiving end The probability distribution of the instantaneous channel capacity of the two detected data streams b, the third detected data stream c, and the fourth detected data stream d is more concentrated than that of the prior art. Note that in the proposal, only the embodiment of the scheme B when M=4 is given, and the embodiment when M=3 and M=5 is not given, but it is easy to analogize.

 In the embodiment of the present invention, the receiving end may further feed back information about K CQIs (channel quality indicators) to the transmitting end, where the K CQIs are in one-to-one correspondence with the K-way data streams, and are used to indicate the K-channel data streams. The quality of the channel experienced by the current TTI. The information of the K CQIs transmitted by the receiving end passes through a noisy channel and arrives at the transmitting end.

After receiving the K CQIs fed back by the receiving end, the transmitting end can determine the corresponding sending according to the received K CQI values. Each channel of the K-way data stream transmitted by the emitter is in the current MCS of the TT 1 (modulation channel coding scheme); the Α body can 釆 W the following to estimate the MCS of the previous TTI:

 The transmitting end receives K CQi Frs fed back by the receiving end. If it is determined that at least one of the received K CQ1 values is not "J", the corresponding transmitting end will not be based on the unreliable at least one CQ1 value. Determining the corresponding at least one data stream in the MCS of the front, and estimating the at least one data stream according to the received CQI value of the previous one or the other at the transmitting end! And determining, according to the at least one data stream, the at least one data stream of the current one or the other MCS in the current MCS. Optionally, determining, by the corresponding K CQI values. At least one of the unreliable means that the transmitting end determines that the signal to noise ratio of at least one of the received K CQI values is lower than a given threshold.

 In the embodiment of the present invention, the probability that the transmitting end determines that at least one of the received CQI values is unreliable is greater than a given value; wherein the given value may be: 5% , or, 10%, or, 40%, or, 50%.

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

 FIG. 3 is a flowchart of a MIMO multi-codeword communication method according to an embodiment of the present invention, which includes the following steps: Step S10, ΜΙΜ0 system has one transmit antenna at a transmitting end, and select one of the transmit antennas to transmit a loop data. Flow, and, for a combination of one or more antennas that are used by one or more data streams whose interference is not eliminated at the receiving end by interference cancellation techniques and still interfere with one data stream, need to be different The symbol period changes at least once;

 In this step, the conditions that need to be met during the process of transmitting the data stream in the tunnel may specifically include:

 Depending on any one of the transmit antennas (set to antenna i), each symbol period of the arbitrarily determined one of the K data streams (set as data stream X) is used for interference cancellation at the receiving end. After the detection technique eliminates the interference of one or more of the symbols of the data stream that has been detected, the interference is not eliminated by the interference cancellation technique and still forms one or more data streams that are garbled by the symbols of the data stream X. a combination of one or more antennas used by the symbol to traverse all or part of a possible combination;

 Alternatively, in the process of transmitting the data stream using all or part of the possible combinations, the number of times each combination is used may be made as equal as possible to achieve the effect of optimal interference diversity.

 In this step, it is assumed that there are M transmitting antennas at the transmitting end, and K antennas are selected to transmit K-channel signals, where K is less than equal Τ· Μ (Κ is not less than 3). Each of the loop signals is independently channel coded. Each channel of the chirped transmit signal alternately uses each of the selected ones of the transmitted large lines during each symbol period of a chirp.

 Step S20: Each channel of the K-channel data stream independently performs channel coding, and at each symbol period of one TTI, at least one of the K-channel data streams uses each of the K transmit antennas in turn;

 Step S30: The receiving end of the MIM0 system receives the interference cancellation detection technology, and the transmission mode adopted by the T- in step S10 enables the better interference diversity at the receiving end.

In the prior art MIM0 multi-codeword communication method, the receiving end adopts the interference cancellation detection technology, and detects one of the paths of the K-channel transmission signal that has not been detected according to the agreed order, and performs channel on the signal. After decoding and verifying correctly, the interference of this channel transmission signal to subsequent detection is eliminated; this step is repeated until all K-channel transmission signals are detected. Thus, in the case where the receiving end receives the interference cancellation detection technique, any one of the K-channel signals uses an antenna for a certain symbol period. When transmitting, for example, 3⁄4 signals that interfere with the signal of the road (actually t: all the way is affected by the other K-1 channel, only the receiving end of the channel interference cancellation technology, the path of the interference signal The number will be reduced in order.) The HJ's launch line is large. There are more than one type (the first day of the day)

First, the 1 line of the detected line line, the possible interference line is only 1 W, and the last detected 1 line is not subjected to dry-interference. Then, in each symbol period of a frame, In the arbitrarily determined path of the open circuit signal, each of the signals transmitted by the arbitrary signal is used to form a signal that interferes with the chopping signal (actually each path is interfered by all other K-1 channels, Only when the receiving end interference is eliminated, the number of interfering signals will be reduced in turn. If the combination of transmitting antennas used can be changed, change at least once (that is, use at least 2 combinations), so that interference diversity (diversity) can be achieved. effect.

 In the embodiment of the present invention, if all possible combinations are traversed, that is, the maximum number of changes is reached, the effect of better interference diversity can be achieved.

 Further: the number of times each combination is used in each symbol period of one 相同 is the same, or as much as possible, and the effect of optimal interference diversity can also be achieved.

 As described above, the data streams &, b, c, and d shown in the scheme B are detected in the order of a, b, c, and d, and the application of the embodiment of the present invention is described below for this case.

 When detecting the data stream a, there is interference of the data streams b, c, d; when detecting the data stream b, since the decoding result of the data stream a is used, the transmission signal of the data stream a is eliminated from the received signal to detect the subsequent data. The influence of the stream, so there is only interference of the data streams c, d: When detecting the data stream c, since the decoding results of the data streams a and b have been sequentially used, the transmission signal pair detection of the data streams a and b is eliminated from the received signal. The influence of the subsequent data stream, so there is only interference of the data stream d; and when the data stream d is detected, since the decoding results of the data streams a, b and c have been sequentially eliminated, the data streams a, b and c are eliminated from the received signal. The impact of the transmitted signal on the detection of subsequent data streams, so there is no interference from other data streams.

 Considering the case of detecting the data stream b, since the decoding result of the data stream a has been used to eliminate the influence of the transmission signal of the data stream a on detecting the subsequent data stream from the received signal, so in the schematic diagram, the symbol of the data stream a is removed. The schematic diagram of scheme B when the detected data stream b is obtained is as follows.

 1: d c b d c b d c b

 2: b d c b d c b d c

 3: c b d c b d c b d

 4: d c b d c b d c b

 As can be seen from the above figure, when the symbol of the data stream b is transmitted by the squall line 2, the symbols of the two data streams that interfere with it are always transmitted by the antennas 3 and 4: when the symbol of the data stream b is transmitted by the antenna 3 At the time, the symbols of the two data streams that interfere with it are always transmitted by antennas 1 and 4; when the symbols of data stream b are transmitted by antenna 4, the symbols of the two data streams that interfere with it are always by antenna 1 And 2 transmission; when the symbol of the data stream b is transmitted by the antenna 1, the symbols of the two data streams which interfere with it are always transmitted by the antennas 2 and 3. That is, when the symbol of the data stream b is transmitted by a certain antenna, the symbols of the two data streams c and d which interfere with it are always transmitted by the fixed two antennas. If the antenna used in the data stream b is transmitted by a certain antenna, the antenna used to transmit the symbols of the two data streams that interfere with it changes with different symbol periods, then the effect of interference diversity can be achieved. Thereby the instantaneous channel capacity of data stream b has a more concentrated distribution.

Consider the case of detecting the data stream c, because the decoding results of the data streams a and b have been sequentially used to eliminate the data from the received signal. The transmission signals of streams a and h have an effect on detecting subsequent data streams. Therefore, in the schematic diagram, the data streams a and b are ^^+, and the detection data stream c is obtained as a schematic diagram of scheme B.

 Antenna 1 : " d c d c d c

 Antenna 2 : d c d c d c

 Antenna 3 : c d c d c d

 Antenna 4.- d c d c d c

 It is easy to see that when the symbol of the data stream c is transmitted by a certain large line, the symbol of a data stream d which interferes with it is always transmitted by a large line which is fixed by 151. If the antenna used in the data stream c is transmitted by a certain determined antenna, the antenna used to transmit the symbol of a data stream d which interferes with it changes with different symbol periods, then the effect of interference diversity can be achieved. Thereby the instantaneous channel capacity of data stream c has a more concentrated distribution.

 When the data stream d is detected, there is no interference of other data streams, so the above-mentioned interference diversity technique is not applied; and when the data stream a is detected, the transmission line is determined after the large line used for transmitting the symbol of the data stream a is determined. The antenna used to form the symbols of the three data streams b, c and d that interfere with it must be the remaining two large lines, which cannot be changed, so the above-mentioned interference diversity technique is not applied.

 For the MCW scheme described in the AIE proposal C30-20061030-070, that is, the above-mentioned scheme B, in the embodiment of the present invention, it can be further improved by adopting the method of interference diversity, so that the instantaneous channel of some data streams is ^ The distribution of quantities can be more concentrated.

 As described above, the interference is determined in each symbol period of the symbol of the arbitrarily determined one of the K data streams (set as the data stream X) by one of the K transmit antennas (set as the antenna m) A combination of one or more antennas that are not used by the symbols of one or more data streams that are eliminated by the interference cancellation technique to still interfere with the symbols of the data stream X, can be changed if at least once The effect of interference diversity; if all possible combinations are traversed, and the number of times each combination is used is as equal as possible, the effect of optimal interference diversity can be achieved.

 The specific embodiment of the embodiment of the present invention is described below by taking the foregoing scheme B as an example.

 The foregoing scheme B is as follows:

 Antenna 1 : a d c b a d c b a d c b

 Antenna 2 : b a d c b a d c b a d c

Antenna 3 _: cbadcbadcbad

 Antenna 4: d c b a d c b a d c b a

A method for improving the solution B to achieve the best interference diversity effect is that the symbols of the data streams a, b, c, and d are respectively transmitted when the respective large lines 1, 2, 3, and 4 are transmitted, and within one TTI, the data stream a , b, c, d and the corresponding relationship of antenna 1, ϊ, 3, 4, traverse all possible arrangements (four kinds of arrangement of 4), and each symbol period within a ,, each arrangement is used The number of times is as equal as possible. Since all permutations are used, it is apparent that when a symbol of a data stream is transmitted by a certain antenna, one or more data streams whose interference is not eliminated by the interference cancellation technique and still interfere with it are transmitted. One or more antennas used by the symbol will traverse all possible combinations. A schematic diagram of this scheme is as follows, in which all 24 arrangements are listed: Big line li aaaaaahbcdcdbbcdcdhhc dcd line 2: bbcdcdaaaaaacdbbdccdb bdc every day line 3: cdbbdccdbbdcaaaaaadcd chh

 Large line 4: dcdcbbdcdchhdcdcbbaaa a can be outputted. In the 24 arrangements, when the data stream b is transmitted by the antenna 2, the corresponding data streams c, d are no longer fixedly transmitted by the large lines 3, 4, but by other A variety of two antenna combinations composed of large lines 1, 3, and 4 are transmitted.

 The above method of traversing all possible permutations will make the implementation more complicated. At the same time, the number of symbol periods included in a TTI must be an integral multiple of 24, so that the number of times each permutation is used is equal and the best is achieved. effect. In fact, there is no need to traverse all possible permutations, and only partial alignment is used to ensure that when a symbol of a data stream is transmitted by a certain antenna, the interference transmitted is not eliminated by the interference cancellation technique. The one or more transmit antenna combinations used for the symbols of the one or more data streams that still interfere with it vary with different symbol periods and traverse all possible combinations to achieve better interference diversity, below The specific implementation process of this method will be deduced - considering the case of detecting the data stream b, as described above, there is interference of the symbols of the two undetected data streams c and d. Since the symbol of b only needs to be transmitted by a certain antenna, the symbols of the two data streams that transmit interference to it cause the two large lines of ffl to traverse all possible combinations, where * is used as the data for interference. The symbols of streams c and d. As can be seen from the first three columns of the diagram, when the symbol of b is transmitted by antenna 2, the two antennas used to transmit the symbols of the two data streams that interfere with it traverse all possible combinations (from the rest) Two of the three antennas, two combinations); it is easy to see that when the symbols of b are transmitted by antennas 3, 4, 1, respectively, the two symbols used to transmit the two data streams that interfere with it are used. The antenna also traverses all possible combinations. The symbols of the data streams c and d, which are interference, can be placed at the position of two * in each column.

 Schematic diagram of the scheme for data stream b to achieve the best interference diversity effect:

 ―

 Antenna 1: * * * * * b b b

 Antenna 2: b b b * * * * * *

 Antenna 3: * * b b b * * *

 Antenna 4: * * * * b b b * *

 The scheme shown in the above diagram achieves the best interference diversity effect for detecting the data stream b. On the basis of the above scheme, by placing the symbols of the data streams c and d as interferences into the positions of two * in each column according to certain rules, the best interference diversity effect is also achieved for detecting the data stream c. The specific design ideas are as follows:

 It is necessary to do so when the symbol of c is transmitted by a certain antenna, an antenna used to transmit the symbol of a data stream d which interferes with it traverses all possible combinations. The table below lists all possible 12 situations. As can be seen from the first three columns of the table below, when the symbol of data stream c is transmitted by antenna 3, one antenna used to transmit the symbol of a data stream d that interferes with it traverses all possible combinations (from the remaining three) One of the large lines, there are three combinations); it is easy to see that when the symbols of c are transmitted by the large lines 4, 1, and 2, respectively, one antenna used for the symbol of one data stream d that interferes with it is transmitted. It also traverses all possible combinations.

 A schematic table of the scheme for data stream c to achieve the best interference diversity effect:

Data antenna large line antenna antenna large line antenna antenna antenna antenna antenna antenna Stream c 3 3 3 4 4 4 1 1 1 2 2 2 Interference number big line big line dog line big line big line big line big line antenna big line big line antenna big line every day

 According to the rogue: d 1 2 4 1 2 3 2 3 4 1 3 4

 3⁄4 ϋ3⁄4 fe3⁄4

 The 12 cases in the above table can be filled in the above-mentioned * of the scheme of the scheme in which the data stream b achieves the best interference diversity effect. One way to fill in is as follows:

 The case where the data stream c is transmitted by the antenna in and the data stream d is transmitted by the antenna n, and the case where the data stream C is transmitted by the antenna n and the data stream d is transmitted by the large line m is called a matching pair, which is recorded as a matching pair ( m, n).

An example of a matching pair is shown in the following table:

In the 12 cases in the schematic table of the scheme in which the data stream c achieves the best interference diversity effect, exactly six matching pairs are formed. You can fill in each matching pair with the following method. In the schematic diagram of the scheme that achieves the best interference diversity effect on data stream b, find two columns with the same * placeholders, and fill in them in turn.

After this operation is performed 6 times, it just fills up. Note the matching pair (m, n)

The two *slots in the schematic of the scheme containing the logarithmic 3-flow b to achieve the best interference diversity effect

The correspondence can be arbitrary. The detailed process is as follows:

 (1) Fill in the matching pair (3, 4) into the schematic

 1 * * * * b b b

 2 b b b *

 3 *

 c * b b b * * d

 4 d * * * b b b c The embodiment of the present invention uses the above scheme. As mentioned earlier, the match pair (ra, n) contains the pair and the data stream

b The two correspondences in the schematic diagram of the scheme that achieves the best interference diversity effect can be arbitrary, so the manner in which the matching pair (3, 4) is filled in the schematic diagram can also be:

[2) Fill in the matching pair (1, 4)

 Embodiments of the invention use the above scheme. As described above, the manner in which the matching pair (1, 2) is filled in the schematic diagram may be another, such as modifying the antenna 2 and the antenna 1 using the antenna used in the data stream c, d of the sixth column, and The antennas used in the nine columns of data streams c, d modify antenna 1 and antenna 2, which are readily available to those skilled in the art and will not be described again.

(6) Fill in the matching pair (2, 3)

 Embodiments of the invention use the above scheme. As described above, the manner in which the matching pair (2, 3) is filled in the schematic diagram may be another, such as modifying the antenna 3 and the antenna 2 using the antenna used in the data stream c, d of the seventh column, and The 12-column data stream c, d uses the antenna to modify the big line 2 and the big line 3, which is easy for professionals in the field to obtain this kind, and will not be described again.

 Thus, the solution of the last embodiment is obtained. From the construction process of the scheme, it can be known that it achieves the best interference diversity effect for data stream b and the best interference diversity effect for data stream c. The white space in the matrix expressing the above scheme is occupied by the symbol of data stream a. For the sake of clarity, the figure of the data stream a is filled in, and the scheme for achieving the best interference diversity effect is as follows:

 Antenna 1: a c c a d c a d d b b b

 Antenna 2: b b b c a d c a c a d d

 Antenna 3: c a d b b b d c a d a c

 Antenna 4: d d a d c a b b b c € a

 The above solution only needs to traverse 12 different arrangements, and the implementation complexity is low. At the same time, the number of symbol periods included in one TTI only needs to be an integer multiple of 12, so that each arrangement can be used equal to the number of times. Good results. It can be known from the construction process of the scheme of the last embodiment described above that each matching pair (m, n) is included.

There are two possible implementations when filling in a schematic of a scheme for data stream b to achieve the best interference diversity. Therefore, when the above six matching pairs (m, n) are included in the scheme of the scheme for achieving the best interference diversity effect on the data stream b,

The possible implementations are 2X2X2X2X2X2=64. These 64 schemes are all obtained using the principles of the embodiments of the present invention, and are all within the scope of the present invention.

These 64 schemes are obtained in this way. When the first matching pair is filled into the schematic, there are two possible implementations, which are recorded as (I _t ,

1 ₂ ). When filling the second matching pair into the schematic, there are two possible implementations, denoted as (Π,, ΙΙ ₂ ). Correspondingly, when filling the 3, 4, 5 and 6 matching pairs into the schematic, there are two possible implementations, respectively (IIL, IIL), (IV, IV,), (Vr, V ₂ ) , (VL, VL). It is easy to see that after filling in the first and second matching pairs, the possible schemes are 2X2=4, ie, scheme 1, 1.

I \Λ\„ 1 ₂ ΙΙ ₂ , for example, 1 ₂ Π, which means that the first match is filled in with 1 ₂ and the second match is used in II. The solution is filled in; After the second and third matching pairs, the possible schemes are 2X2X2=8, ie the scheme IJL IIL, Ι, ΠΙ 1 11,111,. IJH IJI muscle, 1,111 IH Ι ₂ ΙΙ ₂ ΠΙ ₂ , for example Ι ₂ Π, IIL means that the first match pair is filled in with 1 ₂ , the second match pair is used in II, and the solution is implemented, and the third match is used to implement the solution using IIL. When more pairing matches are filled in, that is, when all 6 matching pairs are filled in, the possible implementation scheme is 2X2X2X2X2X2=64.

Easy to verify, in all 24 different arrangements, remove the necessary group to achieve the best interference diversity ≤ less than 12 kinds of non-arrangement; 7, the 12 arrangements of the remaining ', must also reach at least 12 different arrangements of the other group necessary for the interference interference diversity scheme, that is, traversing the remaining 12 kinds of arranged schemes, still reaching the most turbulent interference, every day and every day

Effective wire line 3⁄4f

 Ά fe3⁄43⁄4 & ί方. Case. We can verify this by example.

 In all 24 different permutations: remove at least 12 different permutations necessary to achieve the best interference-diversity scheme, ie 12 permutations of the face, denoted as group one,

Antenna 1 _: ccadcaddbbb

 Antenna 2 : b b b c a d c a c a d d

 Antenna 3 : c a d b b b d c a d a c

 Antenna 4 : d d a d c a b b b c c a

 Then we get the remaining 12 sorts, which are recorded as group two, ie

Antenna 1 _: aaabccbdcbdd Large Line 2: bddaaacbdcbc Antenna 3: dbccbdaaadcb Antenna 4: ccbddbdcbaaa After the interference cancellation technique is applied at the receiving end, the first one is checked |J and its interfered data stream a, the subsequent stream b and The detection of c does not constitute interference, so the port is replaced by a, and the port indicates that the symbol of the current data stream to be detected does not interfere, and thus the interference that does not consider a is as follows: Antenna 1 : - □ □ □ bccbdcbdd Antenna 2 : bdd D □ □ cbdcbc Antenna 3 : dbccbd □ □ □ dcb Antenna 4: ccbddbdcb □ □ □

 Both data streams c and d interfere with the detection of data stream b, so C and d are replaced by *, and * means interference with the symbols of the current data stream to be detected, thereby obtaining

 1: □ a □ b * * b * * b * *

 2: b * * □ □ □ * b * * b *

 3: * b * * b * □ □ □ * * b

 4: * * b * * b * * b 0 □ □ As can be seen from the above figure, for the detection of data stream b, this scheme achieves the effect of optimal interference diversity, that is, when b uses a certain antenna to transmit The combination of transmit antennas used to form a disturbing transmit signal for b traverses all possible combinations.

 The data stream d interferes with the detection of the data stream c, and the data stream b does not interfere with the detection of the data stream c. Therefore, in the schematic diagram in which the interference of a is not considered, d is replaced with * and 1 is used instead of the port. :

Antenna 1 : - □ □ □ □ CC □ * C 0 * * Antenna 2 : D * * □ □ □ C □ * C □ C Antenna 3 : * □ CC □ * □ □ □ * C □ Antenna 4: c C □ * * □ * C □ □ 0 □ As can be seen from the above figure, for the detection of data stream C, this scheme also achieves the effect of optimal interference diversity, ie in C When a certain large-line transmission is performed, the combination of the 3⁄4-ray large-line combination traversing the time-dependent signal that forms a t-disturb for c forms a possible combination. Thus, we have verified that in the 24 different arrangements of the 冇, after removing at least 12 kinds of arrangements that are necessary for the scheme of achieving the highest 奵 柒 柒 3 3 , , , , , , , , , 12 At least 12 different arrangements necessary to achieve a good interference diversity scheme.

 In summary, it can be seen that, in the embodiment of the present invention, in the case of transmitting four data streams, there are two implementations that can be selected for application: one is to traverse all 24 arrangements, and each in one The number of alignments used is as equal as possible, which is recorded as a scheme Α; the other is to traverse the above-mentioned specific 12 permutations, and the number of uses of each permutation in one 尽可能 is as equal as possible, which is recorded as a scheme Β.

 In the actual implementation, the above two schemes can also be combined. Now, an implementation is as follows: Suppose one ΤΤΙ contains 24*4+12=108 symbol periods, then, within one ,, First traverse all 24 types of 4 times, occupy 24*4=96 symbol periods, and then traverse the above 12 specific arrangements for the remaining 12 symbol periods. It is easy to see that this scheme achieves the effect of optimal interference diversity, because in the 24*4=96 symbol periods, all 24 arrangements are traversed according to the first scheme and the number of times of each arrangement is W. In the remaining 12 symbol periods, the specific 12 permutations described above are traversed according to the second scheme and the number of uses of each permutation is equal.

 Usually the number of symbol periods y contained in one ΤΤΙ is not necessarily an integer multiple of 24 or 12. As described above, if a scheme of traversing all 24 permutations is employed, after the traversal is repeated, when the number of remaining symbol periods is less than 24 but large T 12, then the above-mentioned 12 specific types can be traversed according to the second scheme. Arrange once, so that the number of remaining symbol periods must be less than 12; and if the specific 12 permutation schemes described above are used, then after traversing multiple times, when the remaining number of symbol periods is not enough to traverse again, the remaining The number of symbol periods must also be less than 12. Therefore, for the case where the number of symbol periods y contained in one TTI is not 24 or an integer multiple of 12, we only need to consider the case where the number of remaining symbol periods is less than 12 after traversing a plurality of times.

 At this point, we record the remaining number of symbol periods as x, and X is the remainder of y divided by 12, which is necessarily less than 12. The scheme of traversing the alignment over the remaining X symbol periods is given below, which can achieve optimal results.

 The scheme needs to satisfy that, in the X symbol periods, the X sorts that are experienced must be traversed by the above-mentioned specific 12 types of schemes B. As mentioned earlier, Option B can have different 64 implementations, which can be achieved by any of the 12 implementations.

 In the case where X is greater than or equal to 4, in the X symbol periods, the 4 permutations per 4 symbol periods also need to satisfy the principle that: in each of the four queues, each data stream is traversed. All four transmit antennas, that is, each of the data streams, have different transmit antennas in each of the four arrangements. In the following, an embodiment of the above technique is given by taking a specific 12 kinds of arrangements traversed by an implementation of the scheme B of the embodiment of the present invention as an example.

 A specific 12 arrangements traversed by an implementation of the scheme B of the embodiment of the present invention, that is, group one as described above.

12 arrangements, as follows:

Every day, every day, every day, every day of the four symbol periods WW (χ>4) is traversed by the first symbol ^, then according to each c

 3⁄4 3⁄4f 3⁄4f 3⁄4

 d

The principle that the data stream is different in each of the four permutations, and the other traversal in the four symbol periods

 a

 3 permutations, which are inevitably not in the same row as the elements arranged in the row, thus excluding the permutations, as follows

In the figure, the elements in the column corresponding to the excluded arrangement are the same elements as the elements arranged in the same row.

 c

 d

 Antenna 1: a c c -a- d c -a- d d b b b

 Antenna 2: b ir ir c a d c a c a d d

 Antenna 3: c a d b b b d -e- a d a -&

 Antenna 4: d -dr a -d- c a b b b c c a

 After deleting the above-mentioned columns that are excluded - are obtained,

 0) (2) (3) (4) (5)

 1

 a d c d b b

 2

 b a d c a d

 3

 c b b a d a

 4

 d a c r a n b h c c c.

 The selected first arrangement is placed outside [ ].

 In [], the same arrangement of elements of the same row cannot coexist. They are column (1) (3), column (1) (4), column (1) (2), column (1) (4) ( 5), column (2) (5), column (3) (5), column (4) (5). Since (1) cannot coexist with all the columns and exclude (1), then in the remaining columns (2) (3) (4) (5), columns (2), (5), and columns (3) cannot coexist. ) (5), column (4) (5), because (5) cannot coexist with all the remaining columns, exclude (5), so get 4 permutations

Recorded as group one.

 They satisfy the principle that each of the data streams uses different transmit antennas in each of the four permutations.

In the specific 12 arrangements traversed by one implementation of the above scheme B, after removing the above four arrangements, the remaining eight arrangements are as follows:

 Using the similar method of the above four permutations, it can be determined that the eight permutations can be divided into two, each group has 4 permutations and the four permutations within the group satisfy each data stream in the four permutations. The various lines that make W's emission lines are different. The two groups are:

 Antenna 1 : a c d b d c b

 Antenna 2: c h a d a b d

 (Remarked as group 2) (recorded as group three;)

 Antenna 3: b d c a b a c

 Antenna 4: d a b c c d a

with

 As can be seen from the above description, in the case where X is greater than 4, the four permutations per four symbol periods in the X symbol periods may be any one of the group one, the group two, and the third group. Contains 4 permutations.

 More specifically, in the case of the X person in the case of D8, the four permutations included in any one of the group one, the group two, and the third group are traversed in the four symbol periods, for example, the group two, and then the other four. The symbol period traverses the four permutations included in any one of the group one, the group two, and the third group except the traversed group (for example, group two), for example, group one, and the last (X-8) symbol periods. And traversing any (x-8) of the four permutations included in any one of group one, group two, and group three except the two groups that have been traversed (for example, group two, group one).

 In the case where X is equal to 4 and less than 8, four rows including the group one, the group two, and the group three are traversed in four symbol periods, for example, group two, and the last (x-4) The symbol period, traversing any (x-4) of the four permutations included in any one of group one, group two, and group three except the two groups that have been traversed (for example, group two, group one) .

 In the case where X is less than 4, X of any of the four permutations included in any one of group one, group two, and group three is traversed in X symbol periods.

 The above four symbol periods refer to four symbol periods adjacent in the time domain or the frequency domain (that is, not four arbitrary symbol periods, but four adjacent symbol periods), which are used for each data stream. The transmit antennas are different, and the corresponding specific processing may include: within one TTI, the time domain that is experienced from a certain symbol period or the four symbol periods adjacent to the frequency domain, each of the transmit antennas used in each data stream Not identical; used in each data stream from 4 time periods adjacent to the time domain or frequency domain experienced by at least one of the above 4 symbol periods in the time domain or frequency domain The transmit antennas are different; the plurality of sets of time domains or the four symbol periods adjacent to each other in the frequency domain satisfy the above conditions until the number of remaining symbol periods in the one TTI is less than 4.

It is also possible to perform corresponding division processing on the 12 types of queues recorded as group 2 as described above, and the 12 types of the group 2 are arranged as follows: Aaabccbdcbdd

 h d d a a a c b d c h c

 Big man d b c c b d a a a d c b

 Line line ^?

 c c b d d b d c b a a a

The 12 methods of group 1 are divided into the same method as the above three groups. The 12 types of group 2 can also be divided into three groups. The carcass is as follows _:

 Il

Antenna 1: abcd ¹ big line 1: acdb antenna 1: acdb - big line 2: badc antenna 2: dabc big line 2: dabc

 Large line 3: d c a b Large line 3: b d c a Antenna 3: c b a d

 Big line 4: cdba big line 4: cbad antenna 4: bdca visible, the three groups of the group two also satisfy 4 groups per group and 4 rows in the group satisfy each data stream in each of the 4 arrays The resulting transmit antennas are all different.

 In addition, in the actual MIM0+0FDM channel, the channel condition gradually changes along the time domain and the frequency domain. BP, a plurality of symbol periods adjacent to the time domain and the frequency domain, although it can be approximated that the channel conditions are constant during these symbol periods, in fact, the two symbol periods are smaller in the time domain and the frequency domain, the two The difference in channel conditions for the symbol period is smaller. For example, in the foregoing one data packet, eight consecutive OFDM symbols in the time domain are used, and each 0FM symbol occupies a communication scheme of 16 consecutive subcarriers in the frequency domain, although the channel condition can be approximated as the 8 OFDM symbols. And the variation in 128 symbol periods on 16 subcarriers can be neglected, in fact, in two symbol periods located in the same OFDM symbol and adjacent subcarriers, and in two of the same subcarrier and phase OFDM symbol During the symbol period, the channel changes are very small; in the two symbol periods where the time domain or frequency domain interval is large, the channel changes greatly.

 Thus, in order to achieve a better diversity effect, in the process of traversing all 24 kinds of permutations multiple times, or in the process of traversing the 12 kinds of permutations that achieve the optimal interference diversity effect, 遍 traverse 24 arrangements or 12 at a time. In the arrangement, the 24 or 12 permutations included are not traversed in any order, but satisfy each of the four permutations experienced in the four symbol periods in the frequency domain or the time domain, each data stream. The transmitting antennas used are all different principles. Note that in actual communication systems, some symbol periods are used to transmit pilot symbols and thus cannot be used to transmit data symbols; for two symbol periods occupied by two data symbols, they are not physically adjacent, but The interval is one or more symbol periods (usually one symbol period) for transmitting pilot symbols. We also believe that the two symbol periods occupied by the two data symbols are continuous.

 In the case of the scheme B, the method of satisfying the above principle is introduced in the process of traversing the 12 kinds of arrangement times of the optimal interference diversity effect in a continuous 12 symbol periods. The 12 arrangements used are the specific 12 permutations traversed by an implementation of the scheme B of the embodiment of the present invention described above, that is,

From the foregoing, these 12 kinds of -||: columns are divided into 3 groups. 毎^ includes 4 different permutations, and 4 per-rows in each group satisfy each data stream in each of the four permutations. The principle that the transmit antennas of W are different. The two groups are as follows: Group 1:

 Antenna 1 : a c d b antenna 1 : a c d b antenna 1 : d c b

 Antenna 2: b d c a Antenna 2: c b a d Antenna 2: c a b d

 Antenna 3_- c b a d Antenna 3.· b d c a Antenna 3: d b a c

 Antenna 4: d a b c Antenna 4: d a b c Antenna 4: b c d a

 Then, each of the 12 types of processes that traverse the optimal interference diversity effect traverses 4 of any of the above two groups in four consecutive symbol periods in the time domain or the frequency domain. Arranging, and then traversing the four arrays of any one of the remaining groups in the remaining two groups except for the group that has been traversed in the next four time periods of the time domain or the frequency domain, and finally aligning The time domain or the frequency domain traverses the four permutations of the remaining three groups except the two groups that have been traversed in the four consecutive symbol periods to complete the alignment of the twelve permutations. Traversing once.

 When four arrays of one of the above three groups are traversed in four consecutive symbol periods in the time domain or the frequency domain, the order of the four arrays can be arbitrarily changed and the influence on system performance is relatively small. However, in order to achieve a better diversity effect, it is necessary to satisfy the two queues used in two adjacent symbol periods between two adjacent groups, and also satisfy each data stream in the two arrangements. The transmitting antennas used are different from each other.

 As shown in the following figure, it is assumed that the order of traversal in each group is in the order of the above figure, and in the continuous symbol period, 12 rows are traversed in the order of group 1, group 2 and group three, and in the next segment. In the symbol period, the 12 arrays are traversed in the order of group 1, group 2 and group 3. The schematic diagram is as follows:

 Group 2 group ...

As can be seen from the above figure, two adjacent symbol periods between two adjacent groups include: the fourth symbol period of group one and the first symbol period of group two, the fourth symbol of group two The first symbol period of the period and group three, the fourth symbol period of group three, and the first symbol period of group one. It is easy to see that there are only two arrangements of the fourth symbol period of group three and the first symbol period of group one, which does not satisfy each of the transmitting antennas used in each of the two data streams. Not the same principle. Therefore, we correspondingly use the arrangement of the fourth symbol period of the group 3 and the second symbol period of the group three to adjust the order of the four permutations of the four symbol periods of the group three, so that the order of the group three The two arrangements of the four symbol periods and the first symbol period of the group one also satisfy the principle that each of the data streams in each of the two arrangements causes the transmitting antennas of the Sichuan to be different. The adjusted results are as follows: *ii ?i[ ■■ ίΐι ··'. · Weaving

 Antenna 1 : a c d b a c d b a b c d a c d b

 Antenna 2 : b d c a c b a d c d b a b d c a

 Antenna 3 : c b a d b d c a d c a b c b a d

 Antenna 4 : d a b c d a b c b a d c d a b c

 Similarly, as described above, after traversing the aforementioned 12 kinds of arrangement into 24 kinds of arrangement multiple times, in the remaining symbol period of the number less than 12, traversing 0 or several groups as described above, and then traversing In the case of zero or several permutations in a group, the two permutations used in two adjacent symbol periods between two adjacent groups also satisfy each data stream in both arrangements. The various emission lines used by each are different.

 In summary, in order to achieve a better diversity effect, two arrangements of the two channels in the time domain or the frequency domain adjacent to each other are required to satisfy the emission of each data stream in each of the two arrangements. The big lines are all different.

 Next, in the case of adopting scheme A, in the process of traversing all 24 kinds of permutations, each of the four permutations experienced in four consecutive symbol periods is satisfied, and the transmitting antennas used in each data stream are each Not the same principle method. From the foregoing, at least 12 different permutations necessary to achieve the best interference diversity effect can be found in all 24 different permutations, which are grouped as group one and then in all 24 different The arrangement of the 12 arrangements after the removal of the 12 arrangements of the group 1 is inevitably at least 12 different arrangements of the other group necessary to achieve the best interference diversity effect, recorded as a group, and traversing all 24 In the process of arranging multiple times, one of the above two groups may be traversed first, and then the other of the above two groups may be traversed, for example, traversed in the manner of group two, group one, group two, group one. It can be seen that the 12 permutations experienced in the 12 consecutive symbol periods in the frequency domain or the time domain are the 12 permutations included in one of the above two groups, that is, the aforementioned optimal interference is achieved. 12 permutations of diversity effects. In other words, this also achieves better interference diversity gain.

 As mentioned earlier, the 12 permutations contained in each of the two groups can be divided into three groups, each group consisting of four different permutations, and four permutations within each group satisfy each of the four data streams in the four permutations. The transmitting antennas used in each of them have different principles.

 Thus, each of the processes of traversing the twelve permutations in a group over a continuous 12 symbol periods traverses any one of the two groups in a continuous four symbol periods in the time domain or the frequency domain. 4 permutations, and then traverse the 4 permutations of any of the remaining groups of the above three groups except for the group that has been traversed in the following four time periods of the time domain or the frequency domain. Finally, in the next 4 time periods of the time domain or the frequency domain, traversing the 4 queues in the remaining one of the above three groups except the two groups that have been traversed, to complete the One traversal of 12 permutations.

When four arrays of one of the three groups included in any one of the groups are traversed in four consecutive symbol periods in the time domain or the frequency domain, the order of the four arrays may be arbitrarily changed and the influence on the system performance is relatively small. . However, in order to achieve a better diversity effect, it is necessary to satisfy the two arrangements used in two adjacent symbol periods between two adjacent groups, and also to satisfy each of the data streams in each of the two arrangements. The transmit antennas used are all different. Note that since the traversal is performed in the manner of group two, group one, group two, group one, it is necessary to satisfy the two arrangements used in two adjacent symbol periods between two adjacent groups, and also satisfy The principle that each data stream uses different transmit antennas in each of the two arrangements; that is, the last one in group two The arrangement of the first symbol period of the group m is the same as the emission line used for each data stream, and the first group of the last symbol period of the group. Each data stream between the arrays causes the large transmission lines of w to be different. As a comparison, note that when the 12-row arrangement is traversed multiple times, it is traversed once by 12 alignments and then traversed the second time. The last of the 12 permutations and the first of the 12 permutations are in time. The frequency domain is adjacent, so that each of the two data streams in each of the two queues is required to make the transmission line of Sichuan different.

 As described in ft, when the number of remaining symbol periods is less than 24 after traversing the 24 types of alignments, if the remaining symbol period number B is large T-12, the above-mentioned 12 arrangements satisfying the optimal interference diversity are traversed. Once, until the number of remaining symbol periods is less than 12. At this time, the two arrangements used in two adjacent symbol periods between two adjacent groups also try to satisfy that each of the data streams has different transmitting antennas in each of the two arrangements. in principle.

 In accordance with the above principles, a preferred implementation of the present invention is summarized in a communication scheme in which a plurality of consecutive OFDM symbols are used in the time domain of one of the foregoing data packets, and each of the OFDM symbols uses 16 consecutive subcarriers in the frequency domain. example. The following figure shows a way of numbering the eight OFDM symbols and 128 symbol periods on 16 subcarriers. This number only indicates that the two symbol periods adjacent to the sequence number must be in time or in the frequency domain. Neighbors, there are many ways to satisfy this condition. In this paper, only one of the numbering methods is given.

Time domain "OFDM OFDM OFDM OFDM OFDM OFDM OFDM OFDM frequency domain symbol 1 symbol 2 symbol 3 symbol 4 symbol 5 symbol 6 symbol 7 symbol 8 subcarrier 1 _: 1 32 33 64 65 96 97 128 subcarrier 2: 2 31 iii ; Carrier 3 _: 3 30 tt : t Subcarrier 4: 4 29

 Subcarrier 5- 5 28

 Subcarrier 6: 6 27

 Subcarrier 7- 7 26

 Subcarrier 8: 8 25

Subcarrier 9 _: 9 24

 Subcarrier 10: 10 23

 Subcarrier 11 : 11 22

 Subcarrier 12: 12 21

 Subcarrier 13: 13 20

 Subcarrier 14: 14 19 i i i ; Subcarrier 15: 15 18 † ; † ; † Subcarrier 16: 16 17 48 49 80 81 112 113

128 symbol period numbering method one

First, a preferred embodiment of the inventive scheme B will be given. Within 12 symbol periods, the 12 arrangements of the optimal interference diversity can be traversed 10 times in the 1st to 120th symbol periods, each time traversing the 12 arrangements, as described above, The first group, the second group and the second group of the group 1 are sequentially traversed, and the order of the four arrays of the four symbol periods of the group three is noted. . , each stream of each adjacent symbol period makes the transmission line of w not.

 Ηι - m

 Antenna 1 a c d h a c d b a b c d a c d b—

 Antenna 2 h d c a c b a d c d b a b d c a

 Antenna 3 c b a d b d c a d c a b c b a d

 Antenna 4 d a b c d a h c b a d c d a b c

Then, in the remaining 128-120 = 8 symbol periods, the group is traversed one-time, and then the group is traversed twice. In this embodiment, there are no _x symbol periods of the remaining number B, and if so, the first to the Xth symbol period of the group 2 are traversed in order according to the sequence number of the symbol period from small to large. The reason why the X arrays are not randomly selected from the group three, but only the previous X arrays are taken in order, because the order of the four arrays used in the four symbol periods of the group three has been adjusted to satisfy the two adjacent symbol periods. The transmit antennas used for each stream are different.

 A preferred embodiment of the inventive solution A is given below. Within 128 symbol periods, all of the 24 arrangements can be traversed 5 times in the 1st to 120th symbol periods. Each time the 24 kinds of permutations are traversed, the group one is traversed first, and then the group two is traversed. The detailed implementation is as follows:

 Group one group - group - group two group one group _ group two group - group: group two group one group three group - group - acdbacdbabcdabcdacdb an acdb ' acdbbdcacbadcdbabadcd abcdabcddcacbadbdcadc abdcabbdcacbadcbaddab cdabcbadccdbacbadbdca dabc visible from above, Two permutations located in adjacent symbol periods, that is, the last permutation of group two of group one and the first permutation of group one of group two, and the last permutation of group one of group two and the second of group two of group two An arrangement that does not satisfy the requirements of the transmit antennas used by each stream for two adjacent symbol periods is different. To this end, it is necessary to adjust the order in which each of the arrays in group 2 is traversed, and the improved scheme after adjustment is as follows:

 Group-' woven _ group one group one group ≡ group two group - group two group two group group one group - acdbacdbabcdcadbacdb one acdb one acdbbdcacbadcdbadbcad abcdabcbdcacbadbdcadc abadbcbdcacbaddbaddab cdabcbadcbcadcbadbdca dabc The above improved scheme satisfies the adjacent The two symbol periods of each stream use different emission lines for each stream.

 Then, in the remaining 128-120 = 8 symbol periods, the group of group one is traversed once, and then the group of group one is traversed twice. In this embodiment, there are no X symbol periods remaining less than 4, and if so, the first one of the group three of the group one is traversed to the Xth symbol period in accordance with the sequence number of the symbol period from small to large. Alternatively, in the remaining 8 symbol periods, it is also possible to traverse several groups of the group 2, and only need to satisfy the two adjacent symbol periods, and the transmitting antennas used in each stream are different.

In the foregoing embodiment, the 12 permutations of the group 1 are 12 permutations that achieve the optimal interference diversity effect, and are only detected when the four channels of data streams are detected in the order of a, b, c, and d. The verification was established. And easy to verify, in the 4-way data stream In the case of the complete ffl inverse order, that is, in the order of d, c, b, a, the 12 arrangements of the group one are still the 12 arrangements that achieve the optimal interference diversity effect. The sequence is detected according to the sequence of ^ c, b, a, which means that the receiving end first detects the data stream d and causes the W detection result to eliminate the interference of d, and secondly, the receiving end detects the data stream c and eliminates the Sichuan detection result. After the interference, the receiving end detects the data stream b and eliminates the interference of the detection result b, and finally the receiving end detects the data stream 3. The process of verification is detailed in the paragraphs of the face.

 As mentioned earlier, the 12 types of Group One are as follows:

 Group one group one group two group one group two

 a c d b a c d b a b c d

 b d c a c b a d c d b a

 c b a d b d c a d c a b

 d a b c d a b c b a d c

 After the interference cancellation technology is adopted at the receiving end, the first data stream d that is detected and eliminated is not interfered with the detection of the subsequent data stream C, so the d is replaced by the port, and the port indicates the front to be detected. The symbol of the data stream does not form interference, and thus the schematic diagram that does not consider the interference of d is as follows

 Group one group one group one group ffl two group group group two

 a c □ b a c □ b a b c

 b □ c a c b a □ c □ b a

 c b a □ b □ c a □ c a b

 □ a b c □ a b c b a □ c

 Both data streams b and a interfere with the detection of data stream c, so b and a are replaced by *, and * means interference with the symbols of the current data stream to be detected, thereby obtaining

 Group one group one group one group two group one group three

 C □ * C □ * C -

* □ C * C * □ C □ * *

 C * □ □ C * □ C * *

 □ * C □ * C * * □ C

 As can be seen from the above figure, for the detection of data stream c, this scheme achieves the effect of optimal interference diversity, that is, the combination of the transmitting antennas used for the transmission signals that interfere with c when c is transmitted using a certain antenna. Iterate through all possible combinations.

 The data stream a interferes with the detection of the data stream b, and the data stream c does not interfere with the detection of the data stream b. Therefore, in the schematic diagram in which the interference of d is not considered, a is replaced with * and c is replaced with a port, and:

 - group one group two group

 * □ □ b * D Π b * b □

 b □ □ * □ b * □ □ □ b *

 □ b *□ b D □ * □ □ * b

 □ * b □ □ * b □ b * □ □

As can be seen from the above figure, for the detection of data stream b, this scheme also achieves the effect of optimal interference diversity, that is, the transmitting antenna used to form the interfering transmitted signal for b when b is transmitted using a fixed antenna. The combination traverses all possible combinations. From And we verified that the four channels of data are in accordance with the reverse order of the umbrellas, that is, according to the order of d, c, b, a, which is detected in the first/Γϊ order, the 12 arrangements of group one are still reached. There are 12 permutations of S-plus interference.

 And we have verified that in the 24 different arrangements, after removing at least 12 different arrangements necessary to achieve the best interference resolution 3⁄4, the remaining 12 arrangements will inevitably reach the most At least 12 kinds of non-nj arrangements necessary for a scheme that interferes with the diversity effect. Therefore, it is easy to reason, and it is easy to verify. In the case where the four channels of data are detected in the exact opposite order, that is, in the order of d, c, b, a, the 12 arrangements of the group two are also It is still the 12 permutations that achieve optimal interference diversity. As mentioned earlier, the 12 types of group two are as follows:

 It should be noted that, in the above symbol periods 1 and 32, 2 and 31, and 3 and 30 pairs of symbol periods, although the sequence numbers are not continuous, they are actually adjacent in the time domain, for more optimized implementation. The above-mentioned principles of the embodiments of the present invention are also met, and the specific embodiments are not described herein.

 In the wireless communication standard, there are usually three transmission antennas, and the embodiment of the present invention also designs a corresponding solution for achieving the best interference diversity effect.

 Taking the case of using three of the four antennas as an example, each of the three data streams a, b, and c cycles through the scheme of each of the selected three antennas, and the schematic diagram is as follows. Here, it is still assumed The data streams &, b, c are detected at the receiving end in the order of a, b, c, and it is assumed that the big line 3 is not selected for use.

 Antenna 1 : a c b a c b

 Antenna 2: b a c b a c

 Antenna 3:

 Antenna 4: When data stream a has been correctly detected and its interference is removed, the corresponding diagram is

It is easy to see that in the above figure, when the symbol of the data stream b is transmitted by a certain antenna, the sign of a data stream c which interferes with it is always transmitted by a fixed antenna. However, if the symbol of the data stream b is transmitted by a certain antenna, the antenna used to transmit the symbol of a data stream c that interferes with it changes with different symbol periods, then the effect of interference diversity can be achieved. Thus, the instantaneous channel capacity of data stream b has a more concentrated distribution. In order to achieve the best interference diversity effect, when the symbol of the data stream b is transmitted by a certain antenna, the symbol used to transmit a data stream that interferes with it is used with a different symbol period. Change and traverse all possible combinations, and within a TTI, The number of W combinations is made as much as possible.

 The embodiment of the present invention provides a method for achieving the best interference bifurcation effect, that is, the data stream a, b, and c are respectively caused to make the data flow in a TTI when the major lines 1, 2, and 4 are transmitted. a, b, c large line 1, 2, 4 correspondence, traversing all possible permutations (6 kinds of arrangement), and, for each symbol period within a TTI, each arrangement is W as many times as possible phase. W is MJ to all the permutations, then obviously one or more of the symbols used to form a plurality of data streams that interfere with it when a symbol of a data stream is transmitted by a certain large line The antenna will iterate through all possible combinations.

 A schematic diagram of the above scheme is as follows. In the figure, all six arrangements are listed:

 Antenna 1 : a a b c b c

 Antenna 2: b c a a c b

 Antenna 3:

 Antenna 4: c b c b a a

 In the above scheme, the number of permutations used has been small, so that it can be no further reduced. In addition, the analysis also shows that, in the case of using 3 transmit antennas, it is no longer possible to reduce the number of permutations required as in the case of using 4 transmit antennas.

 In the case where the 3 transmission large line is used, when the number of symbol periods y included in one TTI is not an integral multiple of 6, it is considered that the above-described six kinds of arrangement are traversed until the remaining number of symbol periods is small.

 At this point, we will record the remaining number of symbol periods as X, and X is the remainder obtained by dividing y by 6, which is necessarily less than 6. The scheme of traversing the alignment over the remaining X symbol periods is given below, which achieves an optimal effect.

 The scheme needs to satisfy that, in the X symbol periods, the X sorts that are experienced must be traversing the different X species in the above six arrangements.

 In the case of X Τ·等 Τ·3, in the X symbol periods, the three permutations of every three symbol periods need to satisfy the principle that: in each of the three permutations, each data stream All three transmit antennas are traversed, that is, each of the data streams uses different transmit antennas in each of the three arrangements.

 The above six arrangements can be divided into two groups.

(Remarked as group two)

 It is easy to see that each group satisfies three of the arrays in the group, each of which traverses all three transmit antennas, that is, the transmit antenna used by each of the three data streams in each of the three arrays. They are all different.

 In the case where the X person waits for T 3 , the three permutations included in any one of the above group ones and two groups, such as group two, are traversed in three symbol periods, and then in the last (x-3) symbol periods. , traversing any (x-3) of the three permutations included in a group other than one group that has been traversed (for example, group two).

 In the case where X is less than 3, X of any of the three permutations included in any one of the above-mentioned group one and group two is traversed in X symbol periods.

The principle of the optimal scheme for the case of transmitting four streams as described above is the same, in order to achieve a better diversity effect, three streams are transmitted. In the case of ',' in the traversal of the six sorts of ί, in each traversal, the six arrangements of the package are not traversed in any order, but enough to satisfy the subsequent three symbol periods. Each of the three permutations experienced within each of the data streams has a different principle that the emission lines are different. The implementation of the body is that the six arrangements of the traversal are traversing the three permutations of any one of the two groups, and then traversing the three permutations of the remaining ones of the two groups, such as two The six arrangements of the second traversal can be performed in the manner of group, group 2, group 1, and group 2. The order of each arrangement in the group can be arbitrary. For the two fl columns in the adjacent symbol period between the two groups, there must be one and only one transmission line to send the same data stream, which cannot be adjusted by the arrangement order in the group. .

 The above three symbol periods refer to three symbol periods adjacent in the time domain or the frequency domain (that is, not three arbitrary symbol periods, but three adjacent symbol periods), which are used for each data stream. The transmit antennas are different, and the corresponding specific processing may include: Within one TTI, the time period elapsed from a symbol period or the three symbol periods adjacent to the frequency domain, each data stream uses a large transmission The lines are different; each data stream is within 3 symbol periods adjacent to the time domain or frequency domain experienced by at least one of the above 3 symbol periods in the time domain or the frequency domain The transmit antennas used are different; the plurality of sets of time domains or the three symbol periods adjacent to the frequency domain that are sequentially experienced in this way satisfy the above conditions until the number of remaining symbol periods in the one TTI is less than 3.

When the embodiment of the present invention is applied in an actual communication system, in order to facilitate the implementation of the communication system, after all the subcarriers of one OFDM symbol (referred to as OFDM symbol I) allocated to a certain terminal user are sequentially used ( If the first, second, and n subcarriers are used in sequence, the next OFDM symbol adjacent to the time domain (denoted as OFDM symbol II) is used, and can start from the first subcarrier of the next OFDM symbol. For example, in the next OFDM symbol, the first, 2, ..., n subcarriers are used in sequence. In this case, although the first subcarrier of the OFDM symbol II and the last subcarrier of the OFDM symbol I, that is, the nth subcarrier are not adjacent in time or frequency domain, in actual communication In the system, when switching to a subcarrier that is not adjacent to the current subcarrier in the time or frequency domain when each subcarrier is used in sequence, the frequency of occurrence is relatively low (only occurs once in each OFDM symbol), The impact of this situation on system performance is negligible. In the process of the present disclosure, the first subcarrier of the OFDM symbol II and the last subcarrier of the OFDM symbol I (ie, the nth subcarrier) may not be in the time or frequency domain. Adjacent cases are also considered to be substantially consistent with situations that are adjacent in time or frequency domain. The idea of the interference diversity described in the embodiment of the present invention can also be applied to the design of a scheme in which more large lines are transmitted. It is assumed that in the case of five transmit antennas, five data streams _a , b, c, d, e are detected in the order of a, b, c, d, e. The application of the embodiment of the present invention will be described below for this case.

When detecting the data stream a, there is interference of the data streams b, c, d, e; when detecting the data stream b, since the decoding result of the data stream a has been used to eliminate the transmission signal pair detection of the data stream a from the received signal The influence of the subsequent data stream, so there is only interference of the data streams c, d, e; when detecting the data stream c, since the decoding results of the data streams a and b have been sequentially used, the data streams a and b are eliminated from the received signal. The effect of the transmitted signal on the detection of subsequent data streams, so there is only interference of the data streams d, e; when detecting the data stream d, since the decoding results of the data streams a, b and c have been sequentially eliminated, the data stream is eliminated from the received signal The effects of the transmitted signals of a, b, and c on detecting subsequent data streams, so there is only the interference of the data stream e; when detecting the data stream e, because it has been used sequentially The decoding of the data streams a, b, c and d eliminates the influence of the transmitted data of the data streams 8, b, c and d on the detection of subsequent data streams from the received signal ', so there is no interference from other data streams.

 In the case of five large launch lines, there are 120 different arrangements. The method above Yingchuan can be used to find out that the actual interference diversity effect can be achieved by actually traversing a few 0-orders.

 Considering the case of detecting the data stream b, as described above, there are interferences of the symbols of the three data streams (;, d, and e) detected. Since only the symbol of b is emitted by a certain antenna, The three antennas used to transmit the symbols of the three data streams that interfere with it traverse the possible combinations, so the symbols of the data streams c, d and e as interferences are denoted by X. The column indicates the top of each transmission line, and the lines indicate the first 4 lines of each symbol period. It can be seen that when the symbol of b is transmitted by antenna 1, the three antennas used to transmit the symbols of the three data streams that interfere with it are transmitted. Traverse all possible combinations (take 3 out of the remaining 4 large lines, there are 4 combinations); It is easy to see that when the symbols of b are transmitted by antennas 2, 3, 4, 5 respectively, the transmission interferes with it. The three large lines used by the symbols of the three data streams also traverse all possible combinations, and the symbols of the disturbing data streams c, d, and e can be placed at the position of three Xs of each line at will.

 A schematic diagram of the scheme for achieving the best interference diversity effect for data stream b is as follows:

 Antenna 1 antenna 2 antenna 3 antenna 4 antenna 5

 b X X X

 b X X X

 b X X X

 b X X X

 X b X X

 X b X X

 X b X X

 b X X X

 X X b X

 X X b X

 X b X X

 X b X X

 X X X b

 X X b X

 X X b X

 X X b X

 X X X b

 X X X b

 X X X b

 X X X b

Considering the case of detecting the data stream c, as described above, there is interference of the symbols of the two undetected data streams d and e. Since only the symbol of c is transmitted by a certain antenna, the two antennas used to transmit the symbols of the two data streams that interfere with it traverse all possible combinations, so X represents the data stream 3 as interference. The symbol of ₆ . From the first 6 lines of the diagram below ^^, when the symbol of c is transmitted by the large line 1, the symbols of the two data streams that form T-disturbance are transmitted so that the two antennas of the Sichuan traverse all possible combinations (from the 4 large of the remaining ' Take 2 in the line, there are 6 combinations); When the symbol of c is emitted by the big line 2, 3, 4, 5, respectively, the symbol 3 of the two data streams that interfere with it is transmitted. The two large lines also traverse the combination of iTMj. As the symbols of the disturbing data streams d and e, the positions of the two Xs of each line can be arbitrarily placed.

 Schematic of the scheme for the data stream c to achieve the best interference diversity effect

 "Antenna 1 antenna 2 antenna 3 antenna 4 antenna 5

 C X C X C X C X C X X C X X C X C X C C C C X C

X C X C

X C X C X C X X

X C X C C C C X C X

X C X C C C

C examines the case of detecting the data stream d. From the above, there is a disturbance of the symbol of the undetected one data stream e. M is an antenna used when a symbol requiring only d is transmitted by a certain antenna, and a symbol of a data stream that interferes with it is transmitted. The possible combination of pass/force, so it is shown as the sign of the data stream e of 3⁄4 interference. It can be seen from the first six lines of the following schematic. When the symbol of d is transmitted by the large line 1, the symbol of one data stream that interferes with it is transmitted, so that one large line of Sichuan passes all possible combinations. One of the four large lines, one kind); It is easy to use when the symbols of d are transmitted by the big line 2, :3, 4, 5, respectively, and the symbol of one data stream that interferes with it is used. One antenna also traverses the possible combinations. As a symbol of the disturbed data stream e, it is possible to place one X position of each line at will.

 Schematic diagram of the scheme for achieving the best interference diversity effect for data stream d

 —antenna 1 antenna 2 antenna 3 antenna 4 antenna 5]

 d

 d χ

 d χ

 d χ

 χ d

 d x

 d x

 d x

 x d

 x d

 d x

 d x

 x d

 x d

 x d

 d x

 x d

 x d

 x d

 x d

In the schematic diagram of the scheme for achieving the best interference diversity effect on the data stream b, it is considered that the three antennas forming interference with b are the antenna combinations 1, 2, and 3, and the case is replaced by ><. It can be seen that there are 2 cases in total.

Antenna 1 line 2 antenna : antenna 4 antenna 5

 h X X X

 b X X X

 b X X X

 b X X X

 X b X X

 X b X X

 X b X X

 b X X X

 X X h X

 X X b X

 X b X X

 X b X X

 $ $ $ b

 X X b X

 X X b X

 X X b X

 $ $ $ b

 X X X b

 X X X b

 X X X b

Then, in the schematic diagram of the scheme for achieving the best interference diversity effect on the data stream c, it is examined that the three antennas used are large line combinations, and the case of 3 is replaced by >< with $, indicating this case. It can be seen that there are 3 situations in total.

Antenna 1 antenna 2 antenna 3 antenna 4 antenna 5

 c $ $

 c

 C C X C X

 C

 $ C

 C C C C X C X

 $ C

 C C

X C X C X C X X C C C

X X C X C X C X

X C X C C

XCXC can be seen from the above two matrix diagrams. In the first case of the 20 cases where the data stream b achieves the best interference diversity effect, the three antennas that interfere with b are the large line combinations 1, 2, and 3. There are two types: In the matrix diagram of the scheme for achieving the best interference diversity effect on data stream c, there are three types of three antennas used in the case of large line combinations 1, 2, and 3. Therefore, it is impossible to use the three antennas used in the schematic diagram of the scheme for achieving the best interference diversity effect on the data stream c in the first cycle of the 20 cases in which the data stream b achieves the best interference diversity effect. The three cases of 1, 2, and 3 are completely filled in, and only two of them can be filled in. In the case where the three antennas used are any one of nine combinations other than the case of the antenna combination 1, 2, and 3, this is true (5 combinations of 3 and 10 combinations). Therefore, in the 20 cases of the data stream b which achieves the best interference, the 1 time cycle is only used in the diagram of the square 3 of the data stream c which achieves the best interference. The three large lines are the 'λ species of the three types of antenna combinations 1, 2, and 3, as shown in the following figure (matrix diagram a):

 Antenna 1 antenna 2 antenna 3 antenna 4 antenna 5

 b X X X

 b X X X

 b X X X

 b X X X

 X b X X

 X b X X

 X b X X

 b X X X

 X X b X

 X X b X

 X b X X

 X b X X

 c $ $ b

 X X b X

 X X b X

 X X b X

 $ c $ b (matrix diagram a)

 X X X b

 X X X b

 X X X b

Then, in the second cycle of the 20 cases in which the data stream b achieves the best interference diversity effect, the three turns used in the diagram of the scheme for achieving the best interference diversity effect on the data stream c are the antennas. In the three cases of combination 1, 2, and 3, the remaining ones except the two previously filled in, and filled in twice, as shown in the following figure (matrix diagram b):

Antenna I antenna 2 antenna 3 big line 4 big line 5

 h X X X

 h X X X

 b X X X

 h X X X

 X b X X

 X b X X

 X b X X

 b X X X

 X X b X

 X X b X

 X b X X

 X b X X

 $ $ c b

 X X b X

 X X b X

 X X b X

 $ $ c b (matrix diagram b )

 X X X b

 X X X b

 X X X b

 In order to ensure that the best solution to the data stream c achieves the best interference diversity, the three antennas used are the antenna combinations 1, 2, and 3 are used in the same number of times. In practice, the matrix diagram can be used. a, the matrix diagram b, the periodic cycle of the matrix diagram a, that is, according to the matrix diagram a, the matrix diagram b, the matrix diagram a, the matrix diagram a, the schematic diagram of the matrix diagram matrix a. This is equivalent to 60 cases per cycle, and in one cycle, 20 times for the 20 cases of the data stream b to achieve the best interference diversity effect, and the best interference diversity effect for the data stream c 30 cases of the program cycle 2 times.

Then, in the schematic diagram of the scheme for achieving the best interference diversity effect on the data stream c, it is considered that the two large lines forming interference with c are the antenna combinations 1, 2, and X is replaced by S, indicating this. Correspondingly, you can see that there are 3 cases, as shown below:

Antenna 1 antenna 2 antenna 3 antenna 4 antenna 5

 c

 c

 C C C X C X X C X C X C C X C X

 C

 # C

 X C C C C C X C C C

X C X C

 C

 # C

 X C C

XCXC then diagrams the scheme that achieves the best interference diversity effect on data stream d. It is considered that the two large lines used are antenna group bins, and X is replaced by #, indicating this situation. You can see that there are 2 cases, as shown below: Antenna 1 antenna 2 antenna 3 antenna 4 antenna 5

 d #

 d χ

 d χ

 d χ

 # d

 d x

 d x

 d x

 X d

 x d

 d x

 d x

 x d

 x d

 x d

 d x

 x d

 x d

 x d

 x d

 Therefore, in the first cycle of 30 cases where the data stream c achieves the best interference diversity effect, the two antennas used in the diagram of the scheme for achieving the best interference diversity effect on the data stream d are large lines. Combine the two cases of 1, 2, and repeat the case 1 once; then, in the second cycle of the 30 cases that achieve the best interference diversity effect on the data stream c, fill in the data stream d The two antennas used in the schematic diagram of the scheme for achieving the best interference diversity effect are the two cases of the antenna combinations 1, 2, and the case 2 therein is repeatedly filled once.

 In summary, each cycle consists of 60 permutations, which achieves the best overall interference diversity, which is simpler than all 120 different permutations in the case of traversing 5 transmit antennas. The above is a preferred embodiment of the embodiment of the present invention for the 5 transmit antenna MIM0 system. Of course, traversing all of the 120 different arrangements can also achieve the objectives of the embodiments of the present invention, and may constitute a sub-optimal embodiment of the present invention, but the complexity is greater than the preferred embodiment of the present invention traversing 60 permutations.

As described above, we present a scheme in which a data packet uses eight consecutive OFDM symbols in the time domain, and each OFDM symbol occupies a continuous 16 subcarriers in the frequency domain, and the scheme B and the scheme of the embodiment of the present invention. A preferred embodiment of A. These preferred embodiments primarily satisfy the principle of each of the four permutations experienced over four consecutive symbol periods in the frequency domain, each of which uses a different transmission line. These preferred embodiments also satisfy the two arrangements used in adjacent symbol periods in two frequency domains between two adjacent groups, each of which is used in each of the two arrangements. Different principles, note that this is equivalent to satisfying the two arrangements used in adjacent symbol periods in any two frequency domains, each of which uses the transmit antennas used in each of the two arrays. Different principles, because each of the four arrays within a group has met each data The principle that the flow lines used in each of the two arrangements are different. Another preferred embodiment can be found that, in addition to satisfying the above conditions, each data stream of four queues experienced in the four symbol periods successively in the time domain is made to cause a large transmission of w. The principle that the lines are different, and each of the two arrays of m in the adjacent symbol periods in any two time domains are different in the transmitting antennas used in each of the two arrangements. the rules. The design process and results of the other preferred embodiment are described below.

 Consider another preferred embodiment of Scheme B first. As described above, the twelve permutations that achieve the optimal interference diversity effect are traversed in successive 12 symbol periods in the order of the respective permutations shown in the following figure. That is, according to the sequence in the following figure, 12 arrays are traversed in the order of group 1, group 2 and group 3 in a continuous symbol period, and then in group one, group two and group two in the next consecutive symbol period. The order is traversed in 12 orders.

 Group 2 Group 2 - Group 1 3⁄4!=■

 Antenna 1: a c d b a c d b a b c d a c d b

 Antenna 2: b d c a c b a d c d b a b d c a

 Antenna 3: c b a d b d c a d c a b c b a d

 Antenna 4: d a b c d a b c b a d c d a b c Specifically, the group m-n can be used to represent the nth arrangement in the group m. If the embodiment shown in the following figure is used, it is possible to satisfy each of the four permutations experienced in four consecutive symbol periods in the time domain, and the transmission lines used in each data stream are different. in principle.

 Group 1 -1 m- -2 group 3 group 1 -4 group 1 - 1 group 1 -2 group 1 -3 group 1 -4

 Group 1 - 2 Group 1- -3 Group 1- 4 Group 1 -1 Group 1 - 2 Group 1 - 3 Group 1 - 4 Group 1 - 1

 Group 1 -3 Group 1- -4 Group Bu 1 Group 1 ~ 2 Group 1 -3 Group 1 -4 Group 1 - 1 Group 1 - 2

 Group 1 -4 Group 1 -1 Group 1- 2 Group 1 -3 Group 1 -4 Group 1 -1 Group 1 -2 Group 1 -3

 Group 2 - 1 Group 2- 2 Group 2- -3 Group 2- 4 Group 2 -1 Group 2- -2 Group 2- -3 Group 2- -4

 Group 2- -2 Group 2- ■3 Group 2- -4 Group 2- -1 Group 2- -2 Group 2 -3 Group 2_ -4 Group 2 -1

 Group 2- -3 Group 2- 4 Group 2- -1 Group 2- 2 Group 2- -3 Group 2- 4 Group 2- -1 Group 2- -2

 Group 2- -4 Group 2- -1 Group 2- -2 Group 2- 3 Group 2- -4 Group 2 -1 Group 2- -2 Group 2- -3

 Group 3 - 1 group 3 - 2 group 3 -3 group 3- -4 group 3 - 1 group 3- 2 group 3 -3 group 3- -4

 Group 3 -2 group 3 -3 group 3 -4 group 3- -1 group 3 -2 group 3- 3 group 3 -4 group 3 -1

 Group 3 -3 Group 3 -4 Group 3 - 1 Group 3- -2 Group 3 -3 Group 3- 4 Group 3 -1 Group 3- -2

 Group 3 -4 Group 3 -1 Group 3 -2 Group 3_ -3 Group 3- -4 Group 3- 1 Group 3 -2 Group 3- -3

 Group 1 —? Group 2? Group 3- -? Group 2- ? Group 1 -? Group 2- 9 Group 3 -? Group Bu -?

 Group 1 —? Group 2 —? Group 3- -? Group 2- ? Group 1 -? Group 2- ? Group 3 —? Group Bu -?

 Group 1? Group 2 —? Group 3- _? Group 2- ? Group 1 —? Group 2- ? Group 3 —? Group 1- .?

 Group 1 —? Group 2 —? Group 3- -7 Group 2 - Group 1 -? Group 2- ? Group 3 —? Group 1- -?

The group m-? in the above figure , indicates that the use of group m is determined, but which one of the groups m is used, optimization is also required. As can be seen from the above figure, within 4 blocks consisting of 4 consecutive subcarriers and 4 consecutive OFDM symbols indicated by the box "□", all 4 symbols consecutive in all time domains are satisfied. Each of the four permutations experienced during the cycle, used by each data stream The principle that the transmission lines are different, and also meets each of the four arrangements experienced in the four frequency bands in the frequency domain described above, and one data stream makes the transmission line of W Everything is different from the principle of il. For example, every day from day 1 to day 4

亍 carrier and the first to fourth 0 DM symbols;] within the block, the 4 cycles of any one of the 4 X 4 matrix blocks are consecutive 4 symbol periods in the time domain, and The four symbol periods of any one of the 4 X 4 matrix blocks are four symbols of the next four symbols in the frequency domain. It is easy to see that the four antennas that are experienced in the four symbol periods of each row of the matrix block satisfy the principle that each of the data streams causes the transmitting antennas of Sichuan to be different, and at the same time in each column of the matrix block. The four permutations experienced in each symbol period satisfy the principle that the emission lines used in each data stream are different. In this embodiment, the relative order of the four permutations is slightly changed each time the four kinds of queues of each group are traversed a plurality of times, but the increase in complexity is small.

 In the above embodiment, as in a preferred embodiment of the prior scheme B, the symbol periods in which the groups 1 - 4 and the group 2-1 are located are adjacent in the frequency domain, and the groups 2 - 4 and the group 3 - 1 are located. The symbol periods are adjacent in the frequency domain. In addition, the symbol periods in which the following arrangements are located are also adjacent, that is, group 1-1 is adjacent to group 2-2, group 1 _ 2 is adjacent to group 2-3, group 1 _3 is adjacent to group 2-4, Group 2-1 is adjacent to group 3-2, group 2-2 is adjacent to group 3-4, group 2-3 is adjacent to group 3-4. The relative order of the respective permutations in each group can be adjusted so that the queues in each of the adjacent symbol periods described above satisfy the principle that the transmission lines used in one data stream are different.

 The results of the relative order of the various arrangements in each group after adjustment are as follows:

After that, optimize the group m-? Which one of the groups m is specifically used. The principle is based on ensuring that each of the four data streams experienced in successive frequency symbol periods in the frequency domain uses different transmission lines, and in the frequency domain over each adjacent symbol period. The transmit antennas used in each of the data streams in the arrangement are different; secondly, the transmissions used in each of the four permutations experienced in the four consecutive symbol periods in the time domain are guaranteed as much as possible. The antennas are all different, and the transmit antennas used in each of the data streams in each of the adjacent symbol periods in the time domain are different. An implementation designed according to the above principles is as follows:

Group Bu 1 group 2 group 3 group 4 group 1-1 group 1-2 group 1-3 group 1-4

 Group 1-2 Group 1-3 Group Bu 4 Group Bu 1 Group 1 - 2 Group 1 - 3 Group 1_4 Group 1-1

 Group 1-3 group Bu 4 group Bu 1 group Bu 2 group 1-3 group 1-4 group 1-1 group 1-2

 Group 4 Group 1-1 |&1-2 Group 1-3 Group 1-4 Group 1-1 Group 1-2 Group 1 - 3

 Group 2-1 Group 2- 2 Group 2_3 Group 2-4 Group 2-1 Group 2- 2 Group 2-3 Group 2-4

 Group 2_2 Group 2 - 3 12-4 Group 2_1 Group 2-2 Group 2 3 Group 2- 4 Group 2-1

 Group 2-3 Group 2-4 Group 2-1 Group 2- 2 Group 2-3 Group 2-4 Group 2-1 Group 2-2

 Group 2 - 4 Group 2_1 Group 2 - 2 Group 2 - 3 Group 2-4 Group 2-1 Group 2-2 Group 2 3

 Group 3-1 Group 3 -2 Group 3-3 Group 3- 4 Group 3- -1 Group 3- -2 Group 3 -3 Group 3 -4

 Group 3- 2 Group 3- 3 Group 3-4 Group 3 1| Group 3- 2 Group 3- -3 Group 3- -4 Group 3 - 1

 Group 3- 3 Group 3- 4 Group 3-1 Group 3- 2 Group 3- -3 Group 3- -4 Group 3 - 1 Group 3 -2

 Group 3-4 Group 3-1 Group 3-2 Group 3-3 Group 3- 4 Group 3- -1 Group 3- -2 Group 3 -3

 Group 1- -4 Group 2- -4 Group 3 -1 Group 2- -2 Group 1- -4 Group 2- -4 Group 3. -1 Group 1- -2

 Group 1 - 1 group 2 -1 group 3. -2 group 2- -3 group 1 - 1 group 2. -1 group 3- -2 group 1- -3

 Group 1- -2 group 2- -2 group 3. -3 group 2- -4 group 1- -2 group 2- -2 group 3- -3 group 1- -4

Group 1 - 3 Group 2 - 3 Group 3 - 4 Group 2. -1 Group 1 - 3 Group 2 - 3 Group 3 - 4 Group 1 - 1 Second, another optimization of Scheme A Example. We by "I Group m-ri", represents a group of a group of m _[pi permutations, with "Π group mn", two groups represents the group m in the n-th order. If the embodiment shown in the following figure is used, it is possible to satisfy the principle that the transmitting antennas used in each of the four sequences experienced in the four consecutive symbol periods in the time domain are different.

Group I 1-1 Group I 1 - 2 Group I 1 - J Group I 1 - 4 Please 1 -1 Build 1- - 2 Group II 1- - 3 Group 11 1 - 4

Group I every day 1 -2 Group I 1 Group I 1 4 1 Group 1 -1 should 2 should - J Ιί group 1- -4 11 group 1 -1

1 group 1 -3 I group 1 -4 I group 1 -1 I group 1 2 II group 1 -3 II group 1- -4 II group 1 -1 should - 2

Group I 1- -4 Group I 1 -1 Group 1 -2 Group I 1 -3 幽 - -4 Discussion - 1 谨 - -2 Discussion -3

Group I 2- -1 Group I 2- 2 Group I -3 Group I 2- -4 Group 11 2 -1 Group 2 - 2 11 Group 2- -3 Group II 2- 4

Group I 2_ 2 Group I 2- 3 Group I 2- -4 Group I 2 -1 Group 11 2- -2 Group II 2- -3 Group II 2- -4 Group 11 2- -1

Group I 2- 3 Group I 2- 4 Group I 2 -1 Group I 2- -2 Group II 2- -3 Group II 2- 4 Group 2_ -1 Group II 2- 2

Group I 2- 4 Group I 2- 1 Group I 2- -2 Group I 2 -3 Group II 2- -4 Group II 2- -1 Group II 2- 2 Group 2 - 3

Group I 3- -1 I group 3- -2 I group 3 -3 I group 3 -4 II group 3 -1 II group 3- -2 II group 3- -3 II group 3- -4

Group I 3- -2 Group I 3 -3 Group I 3- -4 Group I 3 - 1 Group II 3- -2 Group II 3- -3 Group II 3- -4 Group II 3 -1

Group I 3- -3 Group 1 3- -4 Group I 3 - 1 Group I 3- -2 Group II 3- -3 Group II 3- -4 Group II 3 -1 ΐ Group 3- -2

Group I 3- -4 I group 3 -1 I group 3 -2 I group 3 -3 II group 3- -4 II group 3 -1 II group 3- -2 II group 3- -3

Group I 1- -4 Group I 2- -4 Group I 3- - 1 Group I 2- -2 幽 - -4 Group II 2- -4 Group II 3 -1 Group I 1- -2

Group I 1- -1 Group I 2- -1 Group I 3- -2 Group I 2- -3 Group II 1 - Group II Group 2 -1 Group II 3 -2 Group I 1- -3

Group I - 2 Group I 2- -2 Group I 3- -3 Group I 2- -4 Group II 1- -2 Group II 2- -2 Group II 3 -3 Group I 1- -4

Group I 1-3 I group 2- -3 I group 3- -4 I group 2 -1 II group 1- -3 II group 2- -3 II group 3- - 4 I group -1 As mentioned above, The relative order of the permutations within each group of group ones can be adjusted such that the permutations in each adjacent symbol period satisfy the principle that the transmit antennas used in each data stream are different. The results of the relative order of the various arrangements in each group of the adjusted group 1 are as follows:

 Group one group one - group three

 1: a c d b a b d c d b a c

 2: b d c a c d a b a d c b

 3: c b a d b a c d b c d a

 4: d a b c d c b a c a b d

 It is also possible to adjust the relative order of the columns in each group of the group 2 in the same way, so that the arrangement in each adjacent symbol period satisfies the principle that the transmitting antennas used in each data stream are different. . The corresponding results will not be described here.

Using the same principle, it is also possible to first ensure that each of the four sequences experienced in the four consecutive symbol periods in the time domain uses different transmit antennas, and each adjacent in the time domain. The transmit antennas used in each of the data streams in the arrangement of the symbol period are different; secondly, try to ensure that each of the four permutations experienced in the frequency domain over the four consecutive symbol periods is used. The transmit antennas are all different, and the transmit antennas used in each of the data sequences in the adjacent frequency symbol periods in the frequency domain are different. According to the above principles, the preferred embodiments of the scheme B of the embodiment of the present invention and the other schemes of the scheme A can also be devised, and the corresponding results are not described herein. In the multi-codeword mode, there is antenna selection, that is, there are M transmit antennas at the transmitting end, and the receiving end feedback informs the transmitting end to use the better K (K small T equals M) large lines to transmit the K-channel signal. After the big line selection scheme is determined, this is equivalent to K antenna transmission. In the case of the road number, it is possible to implement the method of the embodiment of the present invention to achieve the overall worst interference diversity effect.

 It should be noted that, in the schematic diagram of the unit matrix provided by the embodiments of the present invention, the order of the columns of the corresponding matrix may be arbitrarily exchanged in the strip f satisfying the corresponding principle, and the order of the rows of the matrix may also be satisfied. The conditions of the corresponding principle. Any exchange, and the new scheme obtained will still have the same effect. This is because, in the embodiment of the present invention, each column of the matrix represents each symbol period within one TTI and each row of the matrix represents each transmit antenna, or each row of the matrix represents each symbol period within one 而 and the columns of the matrix represent For each transmitting antenna, the order of the columns of each row of the matrix, that is, the order of each symbol period in one 或者 or the order of the respective transmitting antennas, can be arbitrarily exchanged to achieve the same effect.

 For the case where the MIM0 system 4 transmits a large-line system, the prior art scheme B traverses four kinds of permutations; and the scheme of the embodiment of the present invention traverses 12 permutations; or traverses 24 permutations.

 When the signal of the second layer or the second layer of the solution B of the prior art is transmitted on a fixed antenna, the set of large lines that interfere with it is fixed, only one combination; the embodiment of the present invention traverses all Possible combinations, or at least two combinations.

 The comparison between the prior art scheme B and the probability distribution map of the instantaneous channel capacity of the scheme of the embodiment of the present invention is shown in Fig. 4. With the MIM0 system of the embodiment of the present invention, the probability distribution of the instantaneous channel capacity is more concentrated than that of the prior art.

 In the above figure, the abscissa indicates the channel capacity, and the ordinate indicates the probability density function. As can be seen from the figure, compared with the solution B, the instantaneous channel capacity of the embodiment of the present invention has a more concentrated distribution. The data analysis shows that the variance of the instantaneous channel capacity under the scheme of the embodiment of the present invention is 9% smaller than the variance of the instantaneous channel capacity under the scheme B.

 Obviously, those skilled in the art should understand that the above modules or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. It is to be understood that changes in these specific embodiments will be apparent to those skilled in the art without departing from the scope of the invention.

 The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Right to ask

 1. A MIM0 multi-codeword communication method of the W Ding Μ1Μ0 system, characterized by D, including:

 The transmitting end of the MiMO system 冇 M transmitting large lines, and the K transmitting large lines transmitting the K-way data stream;

 Each channel of the K-channel data stream is independently channel-encoded. At each symbol period of a transmission time interval TTI, at least one of the K-channel data streams uses each of the K transmission large-line transmissions;

 Receiving, by the receiving end of the MIM0 system, an interference cancellation detection technology; and

 At the transmitting end, a combination of one or more antennas used for the transmission of one or more data streams whose interference is not cancelled by the receiving end by the interference cancellation technique and still interfere with the symbols of a certain data stream, Different symbol periods are changed at least once to achieve interference diversity.

 2. The MIM0 multi-codeword communication method according to claim 1, wherein the method further comprises:

 The receiving end feeds back information of the K channel quality indication CQIs to the transmitting end, and the K CQIs are in one-to-one correspondence with the K-way data streams, and the paths of the routing data streams are used to describe the current path of the routing data stream. Channel quality of the channel.

 The MIM0 multi-codeword communication method according to claim 2, wherein the method further comprises:

 The transmitting end receives the CQIs fed back by the receiving end, and determines, according to the received CQI values, the modulation and channel coding scheme MCS of each path of the respective chopped data streams transmitted by the corresponding transmitting end.

 The MIM0 multi-codeword communication method according to claim 2, wherein after the transmitting end receives the K CQIs fed back by the receiving end, the method further includes:

 If it is determined that at least one of the received K CQI values is unreliable, the transmitting end determines, according to the CQI value received by the transmitting end in the previous one or several TTIs, the at least one unreliable CQI value corresponding to the at least one The one data stream is in the MCS of the current TTI, or the MCS of the current TTI is determined according to the at least one data stream in the previous one or several MC MCSs.

 The MIM0 multi-codeword communication method according to claim 5, wherein determining that at least one of the received K CQI values is unreliable means that the transmitting end determines the received K CQI values. At least one of the signal to noise ratios is below a given threshold.

 The MIM0 multi-codeword communication method according to any one of claims 1 to 5, characterized in that in each symbol period of one frame, each channel in the loop data stream uses each transmission of one of the transmitting antennas in turn, And each mode of the loop data stream uses the transmission mode of each of the transmission large lines to satisfy the following conditions:

 In each symbol period of the symbol of a certain data stream arbitrarily determined by any one of the transmission channel data streams determined by one of the transmitting antennas, the detection technique using the interference cancellation at the receiving end eliminates one or more channels. After the interference of the symbol of the detected data stream, its interference is not cancelled by the receiving end by the interference cancellation technique, so that the symbol of one or more data streams that are still sensible to the symbol of the certain data stream is transmitted. The combination of one or more transmit antennas used varies at least once with different symbol periods within said one to achieve interference diversity.

 7. The MIM0 multi-codeword communication method according to claim 6, wherein, in each symbol period of one frame, each mode of the round-trip data stream is rotated using a mode of each of the transmitting antennas. The following conditions:

Each of the symbols of the arbitrarily determined data stream of one of the transmit loop data streams arbitrarily determined by one of the transmit antennas "In the J period, the It interference is not eliminated by the receiving end by the eviction technique to eliminate one or more transmission lines caused by the symbol of one or more data streams that still interfere with the symbols of the data stream. The combination, the possible combinations, jf-M. Each combination is made the same number of times as possible to achieve optimal interference diversity.

 8. The MIM0 multi-codeword communication method according to claim 7, wherein the method for implementing optimal interference diversity comprises:

 Within a TTI, all possible permutations of the data streams D1, D2, ~Dk correspond to antennas 1, 2, and k are traversed.

 9. The MIM0 multi-codeword communication method according to claim 8, wherein Κ=5, the traversal arrangement is 120; Κ=4, and the traversed queue is 24: Κ = 3, traversed Arranged in 6 types.

 10. The MIMO multi-codeword communication method according to claim 8, wherein the method for implementing optimal interference diversity further comprises:

 The number of uses of each arrangement is as equal as possible within each symbol period within a frame.

 The MIMO multi-codeword communication method according to claim 7, wherein the method for implementing the optimal interference diversity comprises:

 Within a frame, traversing the data stream D1, D2, -Dk is aligned with the portions of all possible columns of the antenna 1, 2, correspondence.

 The MIM0 multi-codeword communication method according to claim 11, wherein K=5, the traversal arrangement is 60; Κ=4, and the traversal arrangement is 12 types.

 The MIM0 multi-codeword communication method according to claim 11, wherein the method for implementing optimal interference diversity further comprises:

 The number of times each of the permutations is traversed is as equal as possible within each symbol period within a frame.

 14. The MIM0 multi-codeword communication method according to claim 7, wherein the method for implementing optimal interference diversity comprises:

 During each symbol period of a frame, all possible 24 arrangements of the correspondence between the data streams D1, D2, and D4 and the large lines 1, 2, 4 are traversed multiple times until the remaining number of symbol periods X is less than 24, That is, it is not enough to traverse all possible 24 kinds of arrangements of the data streams D1, D2, and D4 corresponding to the antennas 1, 2, .

 15. The MIM0 multi-codeword communication method according to claim 14, wherein, when Κ4, 12 permutations experienced in at least one set of time domains or 12 symbol periods adjacent to the frequency domain include implementation 12 permutations of optimal interference diversity.

 16. The MIM0 multi-codeword communication method according to claim 15, wherein the 12 permutations experienced in at least one set of time domains or 12 symbol periods adjacent to the frequency domain include achieving optimal interference. The 12 permutations of diversity include: In a ΤΤΙ, the 12 periods that are experienced in a time domain or a frequency domain adjacent to a symbol period, the 12 permutations experienced are the optimal interference diversity. 12 arrangements;

The 12 permutations experienced in the 12 symbol periods adjacent to the time domain or frequency domain experienced by at least one of the above 12 symbol periods in the time domain or the frequency domain are the most realized. 12 arrangements of excellent interference diversity; the plurality of sets of time domains or the 12 symbol periods adjacent to each other in the frequency domain satisfy the above conditions until the number of remaining symbol periods in the one of the chirps is small. 17. The multi-codeword communication 7:/ method according to claim 14, which is characterized by being arranged in each of the symbol periods of the small 24, satisfying the characteristics of the image:

 If X person - Τ · 12, then the traversal can achieve the optimal interference diversity effect 12 kinds of arrangement once, then the value of X is reduced by 12 to X small D 12;

 During the X symbol periods of Ding 12, traversing the X different types of the 12 arrangements that can achieve the optimal interference diversity effect;

 If 3⁄4 X-person-equal to 8, then traverse the 4 arrangements of the 12 arrangements that satisfy the specific conditions once, and when transmitting the data of the four arrangements described by W, 'satisfy the emission used by each data stream. The antennas are different, and then the value of X is reduced by 4 such that X is small - 8; if X is - equal to 4, then traversing the four arrangements of the 12 arrangements that satisfy the specific conditions once, using the When the four types of data are transmitted, the transmit antennas used for each data stream are different, and then the value of X is reduced by 4 so that X is less than 4; in X symbol periods less than 4, the X types are traversed, in use. When the X arrays are arranged to transmit data, the transmit antennas used for each data stream are different.

 18. The MIM0 multi-codeword communication method according to claim 14, wherein each of the data streams uses different transmit antennas in some adjacent four symbol periods in the time domain or the frequency domain.

 The MIM0 multi-codeword communication method according to claim 18, wherein the transmitting antennas used in each data stream are not in the adjacent four symbol periods in the time domain or the frequency domain. The same, specifically includes - within one frame, the time domain experienced by a certain symbol period or the four symbol periods adjacent to the frequency domain, the transmit antennas used in each data stream are different;

 Transmitting antennas used for each data stream in four symbol periods adjacent to the time domain or frequency domain experienced by at least one of the above four symbol periods in the time domain or the frequency domain Not the same;

 The plurality of sets of time domains or frequency symbols adjacent to each other sequentially satisfy the above conditions until the number of remaining symbol periods in the one of the ones is less than four.

 20. The MIM0 multi-codeword communication method according to claim 14, wherein each of the data streams uses different transmit antennas in all adjacent two symbol periods in the time domain or the frequency domain.

 The MIM0 multi-codeword communication method according to claim 7, wherein when Κ=3, the method for implementing optimal interference diversity comprises:

 During each symbol period of a frame, all possible six arrangements of the correspondence between the data streams D1, D2, D3 and the antennas 1, 2, and 3 are traversed multiple times until the remaining number of symbol periods X is less than 6, which is insufficient. All possible six permutations of the data stream D1, D2, -D3 and the antenna 1, 2, - are traversed once.

 22. The MIM0 multi-codeword communication method according to claim 21, wherein each of the arrays traversed in the x symbol periods less than 6 satisfies the following characteristics:

 The X arrangement traversed is the X species of all possible 6 types of arrangements;

If X is equal to 3, it traverses all three of the six possible arrangements that satisfy the specific condition, and when transmitting data using the three types of arrangements, the transmitting antennas used for each data stream are not satisfied. The same, then the value of X is reduced by 3 so that X is less than 3: Ten: Ding·3) In the symbol period, the arrangement is traversed. When the arrangement of MJ is used to transmit data, each of the data streams is satisfied so that the transmitting antennas of Sichuan are different.

 23. The MIM0 multi-codeword communication method according to claim 21, characterized in that, in some adjacent three symbol periods of the time domain of the frequency domain, a large transmission line is used for each data stream. Different.

 24. The MIMO multi-codeword communication method according to claim 23, wherein in the time domain or in some adjacent three symbol periods of the frequency domain, each data stream uses a large transmission. The lines vary, including:

 Within a ΤΤί, the time domain experienced by a symbol period or the three symbol periods adjacent to the frequency domain, each data stream makes the transmit antennas of ffl different;

 Each data stream causes a transmit antenna of ff1 from three symbol periods adjacent to a time domain or a frequency domain experienced by at least one of the above three symbol periods starting in a time domain or a frequency domain Different from each other;

The plurality of sets of time domains or the three symbol periods adjacent to each other in the frequency domain satisfy the above conditions until the number of remaining symbol periods in the one TTI is less than 3.