WO2008083619A1 - Procédé de communication pour mots multicodés mimo - Google Patents

Procédé de communication pour mots multicodés mimo Download PDF

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Publication number
WO2008083619A1
WO2008083619A1 PCT/CN2008/070041 CN2008070041W WO2008083619A1 WO 2008083619 A1 WO2008083619 A1 WO 2008083619A1 CN 2008070041 W CN2008070041 W CN 2008070041W WO 2008083619 A1 WO2008083619 A1 WO 2008083619A1
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WIPO (PCT)
Prior art keywords
group
data stream
symbol
symbol periods
antenna
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PCT/CN2008/070041
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English (en)
Chinese (zh)
Inventor
Hufei Zhu
Sheng Liu
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Huawei Technologies Co., Ltd.
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Priority claimed from CNA2007100006101A external-priority patent/CN101114890A/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008083619A1 publication Critical patent/WO2008083619A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0625—Transmitter arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0656—Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]

Definitions

  • 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.
  • MIMO Multiple Code Word, abbreviated as MCW
  • MIMO Multiple-Input Multiple-Output
  • 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 ⁇ In the Rayleigh scattering environment, the elements of the channel matrix can be approximated as statistically independent.
  • 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.
  • 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 ⁇ , 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 ⁇ , , ⁇ , ⁇ 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.
  • 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.
  • MIM0's MCW communication scheme there are multiple transmit signals, each with its own independent Turbo coding scheme.
  • 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.
  • 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.
  • 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 ⁇ 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:
  • 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:
  • 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.
  • 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.
  • 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 transmitting end transmits signals to the receiving end by using one virtual antenna port, and the ⁇ is greater than or equal to 2 and less than or equal to 4.
  • the ⁇ is greater than or equal to 2 and less than or equal to 4.
  • the receiving end feeds back K CQI (channel quality. 3 ⁇ 4 indication) information and K ACK/NAC letters, and the ⁇ CQT information tells the transmitting end what is encoded in each corresponding one of the ' ⁇ transmission paths.
  • K CQI channel quality. 3 ⁇ 4 indication
  • K ACK/NAC letters K ACK/NAC letters
  • the ⁇ CQT information tells the transmitting end what is encoded in each corresponding one of the ' ⁇ transmission paths.
  • the MCS The Modulation Channel Coding Scheme
  • 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.
  • 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.
  • a TTI refers to the time interval at which such a packet is transmitted.
  • 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.
  • 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.
  • K is less than or equal to M
  • CQIs respectively indicating the MCS of the K-coded data stream.
  • Solution A Each channel in the K-coded data stream is fixed to a virtual antenna or physical antenna for transmission.
  • 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.
  • 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.
  • 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
  • the schematic diagram is as follows:
  • each of data streams a, b, c, and d is transmitted by a large transmission line.
  • Antenna 1 a d c b 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 b a d c
  • Antenna 4 d c b a d c b a d c b a d c b a
  • 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.
  • 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.
  • the mean values of the instantaneous channel capacities of the data streams are the same.
  • 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.
  • SNK signal-to-noise ratio
  • 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.
  • 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 ⁇ 3 ⁇ 4, is 76% smaller than the variance of the scheme of Non Cyc li ng's instantaneous letter 3 ⁇ 4 ⁇ .
  • 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.
  • the distribution of instantaneous channel capacity of the data stream can be more concentrated, thereby improving the performance of MIM0 multi-codeword communication.
  • FIG. 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;
  • FIG. 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:
  • each of the K-channel data streams alternately enables the transmission modes of the U K large-emission lines to satisfy the following conditions:
  • 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:
  • 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.
  • a method of achieving the above-described effect of optimal interference diversity may include:
  • 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.
  • 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.
  • 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.
  • 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.
  • K CQIs channel quality indicators
  • the information of the K CQIs transmitted by the receiving end passes through a noisy channel and arrives at the transmitting end.
  • 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 ⁇ body can ⁇ 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.
  • 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%.
  • 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, ⁇ 0 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;
  • the conditions that need to be met during the process of transmitting the data stream in the tunnel may specifically include:
  • 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.
  • 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;
  • the number of times each combination is used may be made as equal as possible to achieve the effect of optimal interference diversity.
  • 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.
  • 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.
  • the receiving end receives the interference cancellation detection technique, any one of the K-channel signals uses an antenna for a certain symbol period.
  • the HJ's launch line is large. There are more than one type (the first day of the day)
  • 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.
  • 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.
  • the number of times each combination is used in each symbol period of one ⁇ is the same, or as much as possible, and the effect of optimal interference diversity can also be achieved.
  • 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.
  • 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.
  • the symbol of the data stream b 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.
  • Antenna 1 " d c d c d c d c
  • 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.
  • 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.
  • Antenna 1 a d c b 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 b a d c
  • Antenna 3 cbadcbadcbad
  • Antenna 4 d c b a 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, ⁇ , 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.
  • 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.
  • 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.
  • 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 are used for the symbols.
  • 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.
  • Antenna 2 b b b * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  • the scheme shown in the above diagram achieves the best interference diversity effect for detecting the data stream b.
  • the best interference diversity effect is also achieved for detecting the data stream c.
  • a matching pair which is recorded as a matching pair ( m, n).
  • matching pair 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 match pair (ra, n) contains the pair and the data stream
  • Embodiments of the invention use the above scheme.
  • 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.
  • Embodiments of the invention use the above scheme.
  • 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.
  • 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.
  • 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
  • I ⁇ office 1 2 ⁇ 2 for example, 1 2 ⁇ , 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;
  • IIL means that the first match pair is filled in with 1 2
  • the second match pair is used in II
  • the solution is implemented
  • the third match is used to implement the solution using IIL.
  • 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
  • Antenna 1 aaabccbdcbdd Large Line 2: bddaaacbdcbc Antenna 3: dbccbdaaadcb Antenna 4: ccbddbdcbaaa
  • the interference cancellation technique is applied at the receiving end, the first one is checked
  • 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 ⁇
  • the number of symbol periods y contained in one ⁇ is not necessarily an integer multiple of 24 or 12.
  • the above-mentioned 12 specific types can be traversed according to the second scheme.
  • 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.
  • Option B can have different 64 implementations, which can be achieved by any of the 12 implementations.
  • 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.
  • 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.
  • the elements in the column corresponding to the excluded arrangement are the same elements as the elements arranged in the same row.
  • 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
  • the selected first arrangement is placed outside [ ].
  • 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
  • Antenna 3 b d c a b a c
  • Antenna 4 d a b c c d a
  • 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.
  • 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.
  • 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).
  • 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.
  • 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 :
  • 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.
  • 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.
  • 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.
  • ⁇ 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.
  • 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,
  • 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 4 d a b c Antenna 4: d a b c Antenna 4: b c d a
  • 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.
  • 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.
  • Group 2 group ...
  • 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.
  • 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 4 d a b c d a b c b a d c d a b c
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • the order of the four arrays may be arbitrarily changed and the influence on the system performance is relatively small.
  • the transmit antennas used are all different.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Subcarrier 14 14 19 i i i ; Subcarrier 15: 15 18 ⁇ ; ⁇ ; ⁇ Subcarrier 16: 16 17 48 49 80 81 112 113
  • 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.
  • the group is traversed one-time, and then the group is traversed twice.
  • 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 transmit antennas used for each stream are different.
  • 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:
  • the above improved scheme satisfies the adjacent The two symbol periods of each stream use different emission lines for each stream.
  • the group of group one is traversed once, and then the group of group one is traversed twice.
  • 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
  • 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.
  • 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
  • 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:
  • 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/ ⁇ order, the 12 arrangements of group one are still reached. There are 12 permutations of S-plus interference.
  • the 12 arrangements of the group two are also It is still the 12 permutations that achieve optimal interference diversity.
  • the 12 types of group two are as follows:
  • the embodiment of the present invention also designs a corresponding solution for achieving the best interference diversity effect.
  • 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.
  • 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 4 When data stream a has been correctly detected and its interference is removed, the corresponding diagram is
  • the symbol of the data stream b 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.
  • Antenna 1 a a b c b c
  • Antenna 2 b c a a c b
  • Antenna 4 c b c b a a
  • the number of permutations used has been small, so that it can be no further reduced.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • OFDM symbol I subcarriers of one OFDM symbol allocated to a certain terminal user
  • OFDM symbol II next OFDM symbol adjacent to the time domain
  • the first subcarrier of the OFDM symbol II and the last subcarrier of the OFDM symbol I are not adjacent in time or frequency domain, in actual communication
  • the frequency of occurrence is relatively low (only occurs once in each OFDM symbol)
  • the first subcarrier of the OFDM symbol II and the last subcarrier of the OFDM symbol I 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.
  • 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.
  • 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.
  • 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.
  • antenna 1 antenna 2 antenna 3 antenna 4 antenna 5]
  • 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.
  • XCXC can be seen from the above two matrix diagrams.
  • the three antennas that interfere with b are the large line combinations 1, 2, and 3.
  • 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.
  • 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 ' ⁇ species of the three types of antenna combinations 1, 2, and 3, as shown in the following figure (matrix diagram a):
  • 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.
  • the three antennas used are the antenna combinations 1, 2, and 3 are used in the same number of times.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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 4 Group 1-1
  • Group 1-4 Group 1-1
  • 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 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 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
  • 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.
  • 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.
  • 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 ⁇ and the columns of the matrix represent
  • the order of the columns of each row of the matrix that is, the order of each symbol period in one ⁇ or the order of the respective transmitting antennas, can be arbitrarily exchanged to achieve the same effect.
  • 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.
  • the embodiment of the present invention traverses all Possible combinations, or at least two combinations.
  • the abscissa indicates the channel capacity
  • the ordinate indicates the probability density function.
  • 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.
  • 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.
  • 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.

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  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé de communication pour mots multicodés MIMO utilisé dans un système MIMO. Le terminal d'émission du système MIMO a M antennes de transmission, K antennes d'émission émettant K flux de données; chaque trajet de K flux de données code respectivement et indépendamment un canal selon une période pour chaque symbole dans TTI, au moins un trajet des K flux de données en alternance utilise chaque antenne parmi les K antennes d'émission (S20); le terminal récepteur du système MIMO utilise la technique de détection d'élimination d'interférences en vue de la réception (S30); et la combinaison d'au moins une antenne varieou moins une fois avec différentes périodes de symbole. La combinaison d'au moins une antenne sert à émettre les symboles d'au moins un flux de données qui continuent à interférer avec le symbole d'un flux de données lorsque l'interférence n'est pas éliminée par la technique d'élimination d'interférence, ce qui permet d'obtenir une diversité d'interférences.
PCT/CN2008/070041 2007-01-09 2008-01-08 Procédé de communication pour mots multicodés mimo WO2008083619A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN200710000610.1 2007-01-09
CNA2007100006101A CN101114890A (zh) 2007-01-09 2007-01-09 Mimo多码字通信方法
CN200710072976.X 2007-01-16
CN200710072976 2007-01-16
CN200710195985.8 2007-12-14
CN2007101959858A CN101222258B (zh) 2007-01-09 2007-12-14 Mimo多码字通信方法、装置及系统

Publications (1)

Publication Number Publication Date
WO2008083619A1 true WO2008083619A1 (fr) 2008-07-17

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WO (1) WO2008083619A1 (fr)

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CN104734757A (zh) * 2009-10-30 2015-06-24 韩国电子通信研究院 用于在多用户无线通信系统中传送数据的方法
CN104734757B (zh) * 2009-10-30 2018-04-17 韩国电子通信研究院 用于在多用户无线通信系统中传送数据的方法

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