CN101114890A - MIMO multi-code communication method - Google Patents
MIMO multi-code communication method Download PDFInfo
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- CN101114890A CN101114890A CNA2007100006101A CN200710000610A CN101114890A CN 101114890 A CN101114890 A CN 101114890A CN A2007100006101 A CNA2007100006101 A CN A2007100006101A CN 200710000610 A CN200710000610 A CN 200710000610A CN 101114890 A CN101114890 A CN 101114890A
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Abstract
The invention provides a MIMO multi-code words communication method in a MIMO system, comprising the following steps: a MIMO system transmitting end is provided with M transmission antennae, among which K transmission antennae transmit K parts of data flow. Then in each part of the K data flow, channel coding is carried out individually. Within each sign period of a TTI, at least one part of the K data flow utilizes each transmission of the transmission antennae sequentially. And at the transmitting end of the MIMO system,, an interference excision detection technology is adopted for receiving. In addition, the interference of the sign of one or a plurality of data flows is not removed by the interference excision technology and still interferes with the sign of a part of data flow. Furthermore, the combination of one or a plurality of antennae which is used for transmitting one or a plurality of signs of the data flow changes at least once as the different sign periods to realize disturbance diversity.
Description
Technical field
The present invention relates to the communications field, more specifically, relate to the application of interference diversity and improve the many code words of MIMO (Multiple-Input Multiple-Output, the multiple-input and multiple-output) communication technology (Multiple Code Word is abbreviated as MCW) scheme.
Background technology
According to information theory, use multi-antenna array simultaneously at the transmitting terminal of communication system and receiving terminal or this two ends, can improve transmission bit rate significantly.
Fig. 1 shows the schematic diagram that uses the wireless communication system with Space-Time framework of multi-antenna array at transmitting terminal and receiving terminal simultaneously.This system works is at the Rayleigh scattering environment, and each element of channel matrix can be similar to regards that statistics independently as.
In system shown in Figure 1, a data sequence is divided into M incoherent code element subsequence, and each subsequence is by an emission in M the transmitting antenna.M subsequence received by N reception antenna at receiving terminal after the influence of the channel that is H through a channel matrix.S emission signal s
1..., s
MPass through M different antenna element a-1 respectively ..., a-M emission, corresponding received signal x
1..., x
NRespectively from N different antenna element b-1 ..., b-N receives.
In this system, it is 2 that transmission antenna unit is counted M minimum, and reception antenna unit number N minimum be M.Channel matrix H is the matrix of a N * M, and i reception antenna of element representation of the capable j of i row and j transmitting antenna are by the coupling of transmission channel in the matrix.Received signal x
1..., x
NProcessed to produce transmitting of recovering in digital signal processor
Also shown summation composition c-1 among this figure, c-2 ..., c-N, their representatives can't be avoided the noise signal w that must comprise
1, w
2..., w
N, these noise signals join reception antenna unit b-1 respectively, b-2 ..., in the signal that b-N receives.
General, the mathematic(al) representation that signal transmits and receives is as follows:
In July, 2006, the white paper C30-20060731-040_HKLLMNQRSUZ_PP2Phase2_FDD_Proposal_v1.9 (Joint Proposal for 3GPP2 Physical Layer for FDD Spectra) of 31 purpose 3GPP2 AIE standardization bodies introduced many code words (MCW) communication plan of a kind of MIMO.In the MCW of MIMO communication plan, there is multichannel to transmit, independently Turbo encoding scheme is all adopted separately on each road.For many patterns of code words, receiving terminal uses interference cancellation techniques can obtain very big gain, so many patterns of code words are used the non-linear receiver of interference eliminated usually.Receiving terminal is according to received signal, the Turbo of elder generation decodes, and riches all the way penetrates signal, after the decoding, whether the decoding of judging this road signal according to check digit is correct, if correct, then use decoded results, from received signal, eliminate the influence that transmits that this road has been correctly decoded, again according to the described received signal of having eliminated after the influence, decode another road of Turbo transmits; Carry out above-mentioned step like this iteratively, transmit up to all multichannels of decoding.
In the described many patterns of code words communication plan of the white paper of AIE standardization body, transmitting terminal uses a plurality of virtual-antenna ports to transmit to receiving terminal.Above-mentioned virtual-antenna after a matrix is taken advantage of on the left side of the column vector that being meant transmits forms, is delivered on each physical antenna again and is launched.Accordingly, each transmits, all with matrix in one row multiply each other, each result who obtains delivers to each physical antenna respectively, this is called this transmits and launch by a virtual-antenna, a described virtual-antenna is equivalent to the wave beam in a space.
Many patterns of code words communication plan can also be used simultaneously with the MIMO precoding technique.The motion C802.20-05-69AirInterfaceSpec_Final_Update of Qualcomm in IEEE802.20 provided the design of MIMO precoding technique scheme and pre-coding matrix.Defined a plurality of pre-coding matrixes in this motion, the receiving terminal feedback is the sequence number of an optimum pre-coding matrix wherein, and transmitting terminal uses this pre-coding matrix, carries out transmitting delivering to each virtual-antenna or physical antenna emission again after the precoding.Suppose to deliver to carry out precoding to transmitting after each physical antenna emission, then the mathematic(al) representation that transmits and receives of the represented signal of expression formula (1) becomes again:
In the top expression formula, t
1, t
2..., t
MBe the signal of delivering to the physical antenna emission, actual s emission signal s
1, s
2..., s
MVector and the pre-coding matrix formed multiply each other, and obtain t
1, t
2..., t
MDeliver to the physical antenna emission, corresponding mathematic(al) representation is as follows:
Here,
It is pre-coding matrix.
In above-mentioned MIMO precoding technique, after a matrix is taken advantage of on the left side of the column vector of the composition that transmits, deliver to again on each physical antenna or the virtual-antenna and launch.Accordingly, each transmits, all with matrix in row multiply each other, each result who obtains delivers to each physical antenna or virtual-antenna respectively, this is called this transmits and launch by one deck, described one deck is equivalent to the wave beam in a space.
As mentioned above, the multiplex data stream of many patterns of code words communication plan can pass through a plurality of virtual-antennas, perhaps a plurality of physical antennas, perhaps a plurality of layers of emission in the precoding technique.
Introduce the details of the described many patterns of code words communication plan of white paper of AIE standardization body below in detail, this scheme can be used in the mimo system shown in Figure 1.Under many patterns of code words, transmitting terminal uses M virtual-antenna port to transmit to receiving terminal, described M more than or equal to 2 smaller or equal to 4.On a plurality of virtual transmitting antennas, each transmits the data flow behind the coding of K (K is smaller or equal to M) road constantly, and each road of K circuit-switched data stream is assigned on each virtual transmitting antenna again and launched.
In the MIMO technology, in order more effectively to transmit data, need control, and tell each circuit-switched data of transmitting terminal whether to be received and rectify really decoding the data rate of transmitting terminal.At each TTI (Transition Time Interval, Transmission Time Interval), receiving terminal K CQI (channel quality indication) information of feedback and K ACK/NACK information, wherein CQI information is told which type of MCS of The data (the The modulation and channelcoding scheme after encoding in transmitting terminal each road in the K road of corresponding TTI transmission, modulation and channel coding schemes), and ACK/NACK information tells whether the data behind transmitting terminal each road coding in the K road of corresponding TTI transmission have been received proper really decoding.
Here introduce the notion of above-mentioned TTI.In order to resist channel fading, and the error of transmission that brings of the interference of channel and noise, transmitting terminal is divided into a plurality of packets (Block) to the data of needs transmission, information bit in the same packet is carried out chnnel coding and interweaves, be modulated into a plurality of symbols again by Channel Transmission, and the length of transmitting so needed time of packet has determined the length of a TTI.Receiving terminal receives all symbols that comprise in the same packet earlier, carries out deinterleaving and decoding again.In the present invention, a TTI just is meant the time interval of transmitting such packet.
And each symbol in the packet that is transmitted in TTI can be distributed in different interval on the time domain, perhaps is distributed in different interval on the frequency domain, perhaps is distributed in the different intervals on the two dimensional surface of time domain and frequency domain.A symbol period hereinafter described just is meant an interval that symbol takies by Channel Transmission, the interval that perhaps takies, the perhaps interval that takies on the two dimensional surface of time domain and frequency domain on frequency domain on time domain.For example, the document of IEEE 802.20 standard 2006-01-06 " MBFDD and MBTDD:Proposed Draft Air Interface Specification " described MIMO OFDM (Orthogonal Frequency Division Multiplexing, OFDM) in the communication plan, packet uses 8 OFDM symbols on the time domain, each OFDM symbol takies 16 subcarriers on the frequency domain, symbol period so, just be meant an interval on the two dimensional surface of time domain and frequency domain, 1 subcarrier on 1 OFDM symbol on the time domain just, and this packet has 8 * 16=128 symbol period.
In the MCW pattern, the individual CQI of receiving terminal feedback K (K is smaller or equal to M) indicates the MCS of the data flow after encoding in the K road respectively.The MCW pattern also has two kinds of schemes:
1, scheme first: each road in the data flow behind the coding of K road is fixed on the transmission of some virtual-antennas or physical antenna.
2, scheme second: each road in the K circuit-switched data stream, all pass through K the virtual-antenna or the physical antenna transmission of all selected uses, promptly this antenna is used at some symbol periods in this road, next symbol period uses another antenna, by this method, each road all travels through all antennas.
Submit to motion C30-20061030-070_QCOM_Cycling_of_spatial_streams_in_LBC_ FDD (" the Cycling of spatial streams in LBC FDD of AIE standardization body in October, 2006 in Qualcomm ") in, compared scheme first and scheme second, and the superiority of scheme second has been described.In the Fig 2 of this motion, described under the situation of K=M=4 the schematic diagram of scheme first and scheme second.In the diagram, represent the K=4 road data flow of absolute coding separately respectively, and suppose that this 4 circuit-switched data is detected according to the sequencing of a, b, c, d with a, b, c, d.In other words, receiving terminal is according to received signal, and first decoded data stream a if decoding is correct, then uses decoded results, eliminates transmitting to detecting the influence of follow-up data stream of data flow a from received signal; Secondly, according to the described received signal of having eliminated after influencing, decoded data stream b if decoding is correct, then uses decoded results, eliminates transmitting to detecting the influence that follow-up data flows of data flow b again from received signal; Then, according to the described received signal of having eliminated after influencing, decoded data stream c if decoding is correct, then uses decoded results, eliminates transmitting to detecting the influence that follow-up data flows of data flow c again from received signal; At last, according to the described received signal after the influence, the decoded data stream d of having eliminated.In the schematic diagram below, virtual-antenna of each line display of matrix, perhaps a physical antenna, the perhaps one deck in the precoding technique.The 1st, 2,3,4 row of matrix are designated as antenna 1,2,3,4 respectively.Each row of matrix, represent the symbol period that each are different, and two adjacent row of matrix, pairing two symbol periods are normally adjacent in frequency domain or time-domain, at least, thus the channel situation of adjacent pairing two symbol periods of two row of matrix change less similar.In AIE motion C30-20061030-070, each different subcarrier in the ofdm communication system is shown in each tabulation of matrix, two adjacent row, corresponding two adjacent subcarriers.
Schematic diagram is represented as follows:
Scheme first schematic diagram:
As shown above, in the scheme first, each of data flow a, b, c, d is fixing respectively by a transmission antennas transmit.
Scheme second schematic diagram:
As shown above, in scheme second, each symbol of data flow a, b, c, d recycles each antenna emission.Promptly at certain subcarrier, the symbol of data flow a, b, c, d is respectively by antenna 1,2,3,4 emissions; At next-door neighbour's next subcarrier, circulate into the symbol of data flow d, a, b, c respectively by antenna 1,2,3,4 emissions; At next-door neighbour's next subcarrier, the symbol that recirculates to data flow c, d, a, b is respectively by antenna 1,2,3,4 emissions; Last next subcarrier the next-door neighbour, circulation is launched by antenna 1,2,3,4 respectively for the symbol of data flow b, c, d, a, finish a cycle period thus, thereby begin a new cycle period by the situation of antenna 1,2,3,4 emissions respectively from the symbol of data flow a, b, c, d again at next subcarrier.From the diagonal of matrix, each bar diagonal is all occupied by each symbol of same data flow.
AIE motion C30-20061030-070 points out, variation along with mimo channel, each data flow changes in time in the instantaneous channel capacity (being the transient data throughput) of each TTI in the MCW pattern, and compare with the scheme second that circulation is arranged, the variance that the instantaneous channel capacity of each data flow changes under the scheme first that does not have to circulate is greatly.Be expressed as in the original text: " However; the distributions of the instantaneous capacities in (1) and (2) are different; shown in Fig.3; assuming Rayleigh fading channels.Itcan be seen that; the instantaneous capacity of non-cycling has widerdistribution with a larger tail. " simultaneously, under scheme first and scheme second, the average of the instantaneous channel capacity of each data flow is identical.
In the MCW pattern, K CQI of receiving terminal feedback, and the probability of erasure (the CQI feedback erasure rate) of CQI feedback is than higher, and as described in AIE motion C30-20061030-070, the probability of erasure of CQI feedback reaches 50% in typical channel circumstance.And the probability of erasure of so-called CQI feedback, just be meant because the signal to noise ratio (snr) of CQI feedback is lower, transmitting terminal judges that the CQI of the current feedback of receiving terminal is unreliable, thereby at current TTI, the CQI according to current feedback does not determine modulation and the channel coding schemes that corresponding circuit-switched data stream is adopted, but infers modulation and the channel coding schemes of current CQI to determine that corresponding circuit-switched data stream is adopted according to the CQI of former feedback.And current only modulation of institute and channel coding schemes, by current instantaneous channel capacity decision.Compare with the scheme first, the variance that the instantaneous channel capacity of each data flow changes under the scheme second is less, be that the variance that changes of instantaneous optimal modulation and channel coding schemes and instantaneous CQI is less, thereby when the situation that the CQI feedback is wiped takes place, CQI according to former feedback infers that the error of current CQI is less, thereby the loss that causes is also less.Here it is with respect to the scheme first, the advantage of scheme second.The probability distribution graph of the instantaneous channel capacity of scheme first and scheme second to such as shown in the Fig.3 of AIE motion C30-20061030-070, the simulation result that obtains and the result of this motion are similar, simulation result figure as shown in Figure 2.
Among Fig. 2, abscissa is represented channel capacity, and ordinate is represented probability density function.As can be seen from the figure, compare with the scheme first of Non Cycling, instantaneous channel capacity has more concentrated distribution under the scheme second of Cycling.Data analysis shows, the variance of instantaneous channel capacity under the scheme second of Cycling, little by 76% than the variance of instantaneous channel capacity under the scheme first of Non Cycling.
By adopting the method for interference diversity, scheme second can further be improved, thereby the distribution of the instantaneous channel capacity of some data flow can be more concentrated.
Summary of the invention
The present invention is intended to further improve above-mentioned scheme second by adopting the method for interference diversity, thereby makes the distribution of the instantaneous channel capacity of some data flow can be more concentrated.
The invention provides a kind of MIMO multi-code communication method that is used for mimo system, may further comprise the steps: the mimo system transmitting terminal has M transmitting antenna, selects K transmission antennas transmit K circuit-switched data stream wherein; Chnnel coding is independently carried out on each road of K circuit-switched data stream respectively, and at each symbol period of a TTI, each emission of K transmitting antenna is all used on each road of K circuit-switched data stream in turn; The mimo system receiving terminal adopts interference excision detection technology to receive; Each symbol period at a TTI, each road of K circuit-switched data stream uses the pattern of each emission of K transmitting antenna to satisfy following condition in turn: in each symbol period of the symbol of the circuit-switched data stream of determining arbitrarily in one (being made as antenna i) emission K circuit-switched data stream of determining arbitrarily in by K transmitting antenna (being made as data flow x), after receiving terminal adopts interference excision detection technology to eliminate the interference of symbol of one or more detected data flow, thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to this circuit-switched data stream x forms one or more data flow of disturbing is launched employed one or more antennas, if can change along with different symbol periods, so just must change at least once, to reach the effect of interference diversity.
In above-mentioned MIMO multi-code communication method, in each symbol period of the symbol of the circuit-switched data stream of determining arbitrarily in one (being made as antenna m) emission K circuit-switched data stream of in by K transmitting antenna, determining arbitrarily (being made as data flow x), thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to this circuit-switched data stream x forms one or more data flow of disturbing is launched employed one or more antennas, travel through all possible combination, and the number of times that each combination is used is identical as far as possible, to reach the effect of optimum interference diversity.
In above-mentioned MIMO multi-code communication method, a kind of method that reaches the effect of above-mentioned optimum interference diversity may further comprise the steps: in a TTI, and ergodic data stream D1, D2 ... Dk and antenna 1,2 ... the institute of k corresponding relation might arrange.
In above-mentioned MIMO multi-code communication method, M=5, traversal be arranged as 120 kinds; M=4, traversal be arranged as 24 kinds; M=3, traversal be arranged as 6 kinds.
In above-mentioned MIMO multi-code communication method, a kind of method of effect that reaches above-mentioned optimum interference diversity is further comprising the steps of: in each symbol period in a TTI, use the number of times of each arrangement equal as far as possible.
Method provided by the invention can not travel through might arrange and reach the effect of above-mentioned optimum interference diversity, but travel through the effect that less arrangement just reaches above-mentioned optimum interference diversity.In above-mentioned MIMO multi-code communication method, M=5, being arranged as 60 kinds and getting final product of traversal; M=4, being arranged as 12 kinds and getting final product of traversal.Doing like this can be so that realizes simplyr, and simultaneously in each symbol period in a TTI, the degree of using the number of times of each arrangement to equate is higher.
By technique scheme, the present invention has realized following technique effect:
Adopt mimo system of the present invention, during M=4, more concentrated than the scheme second of high pass in the probability distribution of the instantaneous channel capacity of the 2nd detected data flow b of receiving terminal and the 3rd detected data flow c; During M=5, more concentrated than the scheme second of high pass in the probability distribution of the instantaneous channel capacity of the 2nd detected data flow b of receiving terminal, the 3rd detected data flow c and the 4th detected data flow d.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram that uses the wireless communication system with Space-Time framework of multi-antenna array at transmitting terminal and receiving terminal simultaneously;
Fig. 2 shows the comparison diagram of probability distribution simulation result of the instantaneous channel capacity of scheme first and scheme second;
Fig. 3 shows the flow chart according to the MIMO multi-code communication method of the embodiment of the invention; And
Fig. 4 shows the comparison diagram of probability distribution simulation result of the instantaneous channel capacity of the embodiment of the invention and scheme second.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 3 shows the flow chart according to the MIMO multi-code communication method of the embodiment of the invention, and it may further comprise the steps:
Step S10, mimo system transmitting terminal have M transmitting antenna, select K transmission antennas transmit K circuit-switched data stream wherein;
Step S20, chnnel coding is independently carried out on each road of K circuit-switched data stream respectively, and at each symbol period of a TTI, each emission of K transmitting antenna is used at least one road in the K circuit-switched data stream in turn;
Step S30, mimo system receiving terminal adopt interference excision detection technology to receive; And
Step S40, in each symbol period by the symbol of any circuit-switched data stream of determining (being made as data flow x) in one (being made as antenna i) emission K circuit-switched data stream of determining arbitrarily in K the transmitting antenna, after receiving terminal adopts interference excision detection technology to eliminate the interference of symbol of one or more detected data flow, thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to this circuit-switched data stream x forms one or more data flow of disturbing is launched employed one or more antennas, travel through all possible combination, and the number of times that each combination is used is identical as far as possible, to reach the effect of optimum interference diversity.
Suppose that transmitting terminal has M transmitting antenna, select K antenna emission K road signal wherein, wherein K is smaller or equal to M (K is not less than 3).Chnnel coding is independently carried out on each road of described K road signal respectively.At each symbol period of a TTI, each emission of a selecteed K transmitting antenna is all used on each road that the K road transmits in turn.
In the MIMO multi-code communication method of prior art, receiving terminal adopts interference excision detection technology, order according to agreement, during transmitting, detection K road also do not have a road in each detected road, to this road signal carry out channel-decoding and verification correct after, eliminate this road and transmit the interference of subsequent detection; Repeat this step, transmit up to detecting all K roads.
Adopt at receiving terminal under the situation of interference excision detection technology reception, when any one tunnel of K road signal uses the emission of certain antenna in certain special symbol cycle, if this road signal is formed each road signal of disturbing, and (in fact each road all is subjected to the interference on all other K-1 road, have only receiving terminal to adopt interference cancellation techniques, the way of interference signal just can reduce successively) employed emitting antenna combination is more than a kind of (1 road at first detected signal, possible potato masher antenna combination has only a kind, last 1 road detected signal, be not interfered), so in each symbol period of a TTI, use each symbol period of certain antenna emission of determining arbitrarily on certain road of determining arbitrarily of K road signal, this road signal is formed each road signal of disturbing, and (in fact each road all is subjected to the interference on all other K-1 road, has only the receiving terminal interference eliminated, the way of interference signal just can reduce successively) if employed emitting antenna combination can change, then change and at least once (promptly use at least 2 kinds of combinations).This can reach the effect of interference diversity (diversity).
Travel through all possible combination, this can reach the effect of more excellent interference diversity.
Further: the number of times that each combination is used in each symbol period of 1 TTI is identical, or identical as far as possible, and this can reach the effect of optimum interference diversity.
As previously mentioned, data flow a, the b shown in the scheme second schematic diagram, c, d are detected according to the sequencing of a, b, c, d, describe application of the present invention at this situation below.
When detecting data flow a, there is the interference of data flow b, c, d; When detecting data flow b, because from received signal, eliminated transmitting of data flow a to detecting the influence of follow-up data stream, so only there is the interference of data flow c, d with the decoded result of data flow a; When detecting data flow c, because from received signal, eliminated transmitting of data flow a and b with the decoded result of data flow a and b successively to detecting the influence of follow-up data stream, so only there is the interference of data flow d; And when detecting data flow d, because from received signal, eliminated transmitting to detecting the influence of follow-up data stream of data flow a, b and c with the decoded result of data flow a, b and c successively, so there is not the interference of other data flow.
Investigate the situation that detects data flow b, because from received signal, eliminated transmitting of data flow a, so in the diagram, the symbol of data flow a removed to detecting the influence of follow-up data stream with the decoded result of data flow a, the schematic diagram of scheme second is as follows when obtaining detecting data flow b
By last figure as can be seen, when the symbol of data flow b is launched by antenna 2, its is formed the symbol of two data flow disturbing always by antenna 3 and 4 emissions; When the symbol of data flow b is launched by antenna 3, its is formed the symbol of two data flow disturbing always by antenna 1 and 4 emissions; When the symbol of data flow b is launched by antenna 4, its is formed the symbol of two data flow disturbing always by antenna 1 and 2 emissions; When the symbol of data flow b is launched by antenna 1, its is formed the symbol of two data flow disturbing always by antenna 2 and 3 emissions.That is,, its is formed the symbol of two data flow c disturbing and d always by changeless two antennas emission when the symbol of data flow b during by some definite antenna emissions.If when the symbol of data flow b is launched by some definite antennas, emission changes along with different symbol periods the employed antenna of symbol that it forms two data flow disturbing, so just can reach the effect of interference diversity, thereby allow the instantaneous channel capacity of data flow b have more concentrated distribution.
Investigate the situation that detects data flow c, because from received signal, eliminated transmitting of data flow a and b with the decoded result of data flow a and b successively to detecting the influence of follow-up data stream, so in the diagram, the symbol of data flow a and b is removed, the schematic diagram of scheme second is as follows when obtaining detecting data flow c
Find out easily, when the symbol of data flow c is launched by some definite antennas, its is formed the symbol of a data flow d who disturbs always by changeless antenna emission.If when the symbol of data flow c is launched by some definite antennas, emission changes along with different symbol periods the employed antenna of symbol that it forms a data flow d who disturbs, so just can reach the effect of interference diversity, thereby allow the instantaneous channel capacity of data flow c have more concentrated distribution.
When detecting data flow d, there is not the interference of other data flow, so do not use above-mentioned interference diversity technology; And when detecting data flow a, because after the used antenna of the symbol of data streams a is determined, three data flow b, c that emission form to be disturbed its and the employed antenna of symbol of d must be three remaining antennas, can not change, so also do not use above-mentioned interference diversity technology.
MCW scheme described in the AIE motion C30-20061030-070, promptly above-mentioned scheme second can further improve by the method that adopts interference diversity, thereby the distribution of the instantaneous channel capacity of some data flow can be more concentrated.
As mentioned above, in each symbol period of the symbol of the circuit-switched data stream of determining arbitrarily in one (being made as antenna m) emission K circuit-switched data stream of in by K transmitting antenna, determining arbitrarily (being made as data flow x), thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to this circuit-switched data stream x forms one or more data flow of disturbing is launched employed one or more antennas, if can change then change at least once, can reach the effect of interference diversity; Travel through all possible combination, and the number of times that each combination is used is identical as far as possible, can reaches the effect of optimum interference diversity.
Be example with aforesaid scheme second below, the specific embodiment of the present invention is described.
Aforesaid scheme second schematic diagram is as follows:
A kind of improvement project second is to reach the method for best interference diversity effect, be exactly that the symbol of data flow a, b, c, d is when using each antenna 1,2,3,4 emissions respectively, in a TTI, the corresponding relation of data flow a, b, c, d and antenna 1,2,3,4, travel through all possible arrangement (4 be arranged with 24 kinds), and, each symbol period that TTI is interior, the number of times that each arrangement is used to is equal as far as possible.Because all arrangements all are used to, so obviously, when the symbol of certain data flow is launched by some definite antennas, be eliminated the employed one or more antennas of symbol that still its formed one or more data flow of disturbing thereby launch its interference, can travel through all possible combination by interference cancellation techniques.The schematic diagram of this scheme is as follows, and among the figure, 24 kinds of all arrangements all are listed:
The method of the above-mentioned all possible arrangement of traversal can make the complexity of realization higher, and simultaneously, the symbol period number that TTI comprises must be 24 integral multiple, and the number of times that every kind of arrangement is used equates and reaches best effect.In fact, do not need to travel through all possible arrangement, just can guarantee when the symbol of certain data flow is launched by some definite antennas, thereby launch its disturb not by interference cancellation techniques be eliminated still its is formed one or more data flow of disturbing the employed one or more emitting antenna combination of symbol along with different symbol periods changes, and travel through all possible combination.This method of deriving below.
Investigate to detect the situation of data flow b, from the above mentioned, at this moment have the interference of the symbol of two data flow c not detecting and d.Because when only needing the symbol of b to be launched by some definite antennas, emission travels through all possible combination to employed two antennas of symbol that its forms two data flow disturbing, represents as the data flow c of interference and the symbol of d with * here.From the first three columns of following schematic diagram as can be seen, when the symbol of b is launched by antenna 2, emission travels through all possible combination (get two from three antennas of remainder, three kinds of combinations are arranged) to employed two antennas of symbol that it forms two data flow disturbing; Find out that easily emission also travels through all possible combination to employed two antennas of symbol that its forms two data flow disturbing when the symbol of b is launched by antenna 3,4,1 respectively.And, can arbitrarily put into the position of two * of each row as data flow c that disturbs and the symbol of d.
Data flow b is reached the schematic diagram of the scheme of best interference diversity effect:
The scheme that top schematic diagram is represented has reached best interference diversity effect to the situation that detects data flow b.On the basis of such scheme, by as data flow c that disturbs and the symbol of d, put into the position of two * of each row according to certain rule, make the situation that detects data flow c is also reached best interference diversity effect that concrete mentality of designing is as follows.
The symbol that need accomplish c is during by some definite antenna emissions, and emission travels through all possible combination to the employed antenna of symbol that its forms a data flow d who disturbs.Following table has been listed all possible 12 kinds of situations.Be listed as can be seen by preceding 3 of following table, when the symbol of data flow c is launched by antenna 3, emission travels through all possible combination (get from three antennas of remainder, three kinds of combinations are arranged) to the employed antenna of symbol that it forms a data flow d who disturbs; Find out that easily emission also travels through all possible combination to employed 1 antenna of symbol that its forms 1 the data flow d that disturbs when the symbol of c is launched by antenna 4,1,2 respectively.
Data flow c is reached the schematic table of the scheme of best interference diversity effect
| Data flow c | Antenna 3 | Antenna 3 | ?3 | ?4 | ?4 | ?4 | ?1 | ?1 | ?1 | ?2 | ?2 | ?2 |
| Interfering data stream d | Antenna 1 | 2 | ?4 | ?1 | ?2 | ?3 | ?2 | ?3 | ?4 | ?1 | ?3 | ?4 |
12 kinds of situations in the last table just in time can all be inserted among the * of schematic diagram of the aforesaid scheme that data flow b is reached best interference diversity effect.A kind of method of inserting is as follows:
Data flow c by antenna m emission and data flow d by the situation of antenna n emission, data flow d is by the situation of antenna m emission by antenna n emission with data flow c, it is right to be called a coupling, be designated as coupling to (m, n).
One mates shown in the right following form of example:
| Data flow c | Antenna 3 |
| Interfering data stream d | Antenna 1 |
| Data flow c | Antenna 1 |
| Interfering data stream d | Antenna 3 |
Data flow c is reached 12 kinds of situations in the schematic table of scheme of best interference diversity effect, it is right just in time to have formed 6 couplings.Can in the schematic diagram of the scheme that data flow b is reached best interference diversity effect, look for two row that the * occupy-place is identical each coupling to inserting, insert successively with following method
With
Such operation is just filled up after carrying out 6 times.Detailed process is as follows:
(1) coupling is inserted schematic diagram to (3,4)
(2) again coupling is inserted schematic diagram to (1,4)
(3) again coupling is inserted schematic diagram to (1,3)
(4) again coupling is inserted schematic diagram to (2,4)
(5) again coupling is inserted schematic diagram to (1,2)
(6) again coupling is inserted schematic diagram to (2,3)
Obtained last scheme like this, can know from the construction process of this scheme, it both reached best interference diversity effect to data flow b, also data flow c was reached best interference diversity effect.Blank position in the matrix of expression such scheme is occupied by the symbol of data flow a.In order to express clearly, the symbol of data flow a to be inserted, the schematic diagram of scheme that must reach best interference diversity effect is as follows:
Above-mentioned scheme only need travel through 12 kinds of different arrangements, and the complexity of realization is lower, and simultaneously, the symbol period number that TTI comprises only need be 12 integral multiple, and the number of times that every kind of arrangement is used equates and reaches best effect.
Usually use the situation of 3 transmitting antennas in the standard in addition, also reach the scheme of best interference diversity effect for this situation design.
In the motion of Qualcomm, also provided under 3 the situation of only using in 4 antennas, each symbol of 3 data flow a, b, c recycles each the scheme in selecteed 3 antennas, its schematic diagram is as follows, notice that still tentation data flows a, b, c is detected according to the sequencing of a, b, c at receiving terminal here, and hypothesis antenna 3 there is not selected use.
After data flow a had correctly been detected and eliminated its interference, schematic diagram was accordingly,
See easily, in last figure, when the symbol of data flow b is launched by some definite antennas, its is formed the symbol of a data flow c who disturbs always by changeless antenna emission.And if when the symbol of data flow b during by some definite antenna emissions, emission changes along with different symbol periods the employed antenna of symbol that it forms a data flow c who disturbs, so just can reach the effect of interference diversity, thereby allow the instantaneous channel capacity of data flow b have more concentrated distribution.And in order to reach best interference diversity effect, need accomplish when the symbol of data flow b is launched by some definite antennas, employed one of the symbol of the data flow that emission form to be disturbed its changes and travels through all possible combination along with different symbol periods, and in a TTI, the number of times that each combination is used is identical as far as possible.
A kind of method that reaches best interference diversity effect, be exactly that the symbol of data flow a, b, c is when using each antenna 1,2,4 emissions respectively, in a TTI, data flow a, b, c and antenna 1,2,4 corresponding relations, travel through all possible arrangement (3 be arranged with 6 kinds), and, each symbol period that TTI is interior, the number of times that each arrangement is used to is equal as far as possible.Because all arrangements all are used to, so obviously when the symbol of certain data flow was launched by some definite antennas, emission formed the employed one or more antennas of symbol of one or more data flow of disturbing to its, can travel through all possible combination.The schematic diagram of this scheme is as follows, and among the figure, 6 kinds of all arrangements all are listed:
Above-mentioned scheme, employed number of permutations is less, does not need further minimizing.In addition, analysis also shows, for the situation of using 3 transmitting antennas, cannot reduce the number of the arrangement of required use as the situation of using 4 transmitting antennas.
The thought of interference diversity of the present invention also can be used for the conceptual design under the situation of multiple transmit antennas more.Suppose that under the situation that 5 transmitting antennas are arranged 5 data flow a, b, c, d, e are detected according to the sequencing of a, b, c, d, e.At this situation application of the present invention is described below.
When detecting data flow a, there is the interference of data flow b, c, d, e; When detecting data flow b, because from received signal, eliminated transmitting of data flow a to detecting the influence of follow-up data stream, so only there is the interference of data flow c, d, e with the decoded result of data flow a; When detecting data flow c, because from received signal, eliminated transmitting of data flow a and b with the decoded result of data flow a and b successively to detecting the influence of follow-up data stream, so only there is the interference of data flow d, e; When detecting data flow d, because from received signal, eliminated transmitting of data flow a, b and c with the decoded result of data flow a, b and c successively to detecting the influence of follow-up data stream, so only there is the interference of data flow e; When detecting data flow e, because from received signal, eliminated transmitting of data flow a, b, c and d with the decoded result of data flow a, b, c and d successively to detecting the influence of follow-up data stream, so there is not the interference of other data flow.
Under the situation of 5 transmitting antennas, 120 kinds of different arrangements are arranged.Method above using can be obtained, and the actual fewer purpose of traversal that only needs is arranged, and just can reach best interference diversity effect.
Investigate to detect the situation of data flow b, from the above mentioned, at this moment have the interference of the symbol of 3 data flow c, d not detecting and e.Because the symbol that only needs b is during by some definite antenna emissions, emission travels through all possible combination to employed 3 antennas of symbol that its forms 3 data flow disturbing, thus with * expression as data flow c, the d of interference and the symbol of e.Go as can be seen from preceding 4 of following schematic diagram, when the symbol of b was launched by antenna 1, emission traveled through all possible combination (get 3 from 4 antennas of remainder, 4 kinds of combinations are arranged) to employed 3 antennas of symbol that its forms 3 data flow disturbing; Find out that easily emission also travels through all possible combination to employed 3 antennas of symbol that its forms 3 data flow disturbing when the symbol of b is launched by antenna 2,3,4,5 respectively.And as the data flow c, the d that disturb and the symbol of e, can arbitrarily put into 3 of each row * the position.
The schematic diagram of scheme that data flow b is reached best interference diversity effect is as follows:
Investigate to detect the situation of data flow c, from the above mentioned, at this moment have the interference of the symbol of 2 data flow d not detecting and e.Because the symbol that only needs c is during by some definite antenna emissions, emission travels through all possible combination to employed 2 antennas of symbol that its forms 2 data flow disturbing, thus with * expression as the data flow d of interference and the symbol of e.Go as can be seen from preceding 6 of following schematic diagram, when the symbol of c was launched by antenna 1, emission traveled through all possible combination (get 2 from 4 antennas of remainder, 6 kinds of combinations are arranged) to employed 2 antennas of symbol that its forms 2 data flow disturbing; Find out that easily emission also travels through all possible combination to employed 2 antennas of symbol that its forms 2 data flow disturbing when the symbol of c is launched by antenna 2,3,4,5 respectively.And as data flow d that disturbs and the symbol of e, can arbitrarily put into 2 of each row * the position.
Data flow c is reached the schematic diagram of the scheme of best interference diversity effect
Investigate the situation that detects data flow d, from the above mentioned, at this moment have the interference of the symbol of 1 the data flow e that does not detect.Because the symbol that only needs d is during by some definite antenna emissions, emission travels through all possible combination to employed 1 antenna of symbol that its forms 1 data flow disturbing, so with * expression the symbol as the data flow e of interference.Go as can be seen from preceding 6 of following schematic diagram, when the symbol of d was launched by antenna 1, emission traveled through all possible combination (get 1 from 4 antennas of remainder, 4 kinds of combinations are arranged) to employed 1 antenna of symbol that its forms 1 data flow disturbing; Find out that easily emission also travels through all possible combination to employed 1 antenna of symbol that its forms 1 data flow disturbing when the symbol of d is launched by antenna 2,3,4,5 respectively.And as the symbol of the data flow e that disturbs, can arbitrarily put into 1 of each row * the position.
Data flow d is reached the schematic diagram of the scheme of best interference diversity effect
At the schematic diagram that data flow b is reached the scheme of best interference diversity effect, investigating b is formed 3 antennas that disturb is situations of combination of antennas 1,2,3, * with replacing, represent this situation.Can see the 2 kinds of situations that have.
Then at the schematic diagram that data flow c is reached the scheme of best interference diversity effect, the situation that to investigate employed 3 antennas are combination of antennas 1,2,3, * with replacing, represent this situation.Can see the 3 kinds of situations that have.
Two figure reach the 1st circulation time of 20 kinds of situations of best interference diversity effect to data flow b as can be seen above the contrast, and it is that the situation of combination of antennas 1,2,3 has 2 kinds that b is formed 3 antennas that disturb; And in the schematic diagram of the scheme that data flow c is reached best interference diversity effect, the situation that employed 3 antennas are combination of antennas 1,2,3 has 3 kinds.So can not be at the 1st circulation time of 20 kinds of situations that data flow b reached best interference diversity effect, in the schematic diagram of the scheme that data flow c is reached best interference diversity effect, employed 3 antennas are that 3 kinds of situations of combination of antennas 1,2,3 are inserted fully, can only insert wherein 2 kinds.Are any one situations of other the 9 kinds of combinations beyond the situation of combination of antennas 1,2,3 for 3 antennas that use, this point all is (5 get 3 has 10 kinds of combinations) of setting up.
So at the 1st circulation time of 20 kinds of situations that data flow b reached best interference diversity effect, only insert and in the schematic diagram of the scheme that data flow c is reached best interference diversity effect, employed 3 antennas are 2 kinds in 3 kinds of situations of combination of antennas 1,2,3, as figure below (figure a) shown in:
Then at the 2nd circulation time of 20 kinds of situations that data flow b reached best interference diversity effect, insert and in the schematic diagram of the scheme that data flow c is reached best interference diversity effect, employed 3 antennas are a kind of remainders except before be received in 2 kinds in 3 kinds of situations of combination of antennas 1,2,3, and insert twice, shown in figure below figure b:
And in order to guarantee in the schematic diagram of the scheme that data flow c is reached best interference diversity effect, employed 3 antennas are that the number of times that 3 kinds of situations of combination of antennas 1,2,3 are used equates, can be in the reality according to the loop cycle of figure a, figure b, figure a, promptly the mode according to figure a, figure b, figure a, figure a, figure b, figure a circulates.Be equivalent to each cycle period like this and comprise 60 kinds of situations, and in a cycle period, data flow b is reached 20 kinds of situations circulation 3 times of the scheme of best interference diversity effect, and data flow c is reached 30 kinds of situations circulations 2 times of the scheme of best interference diversity effect.
In the schematic diagram of the scheme that data flow c is reached best interference diversity effect, investigating c is formed 2 antennas that disturb is situations of combination of antennas 1,2 then, * replace with #, represent this situation.Can see having 3 kinds of situations, as follows:
Then at the schematic diagram that data flow d is reached the scheme of best interference diversity effect, the situation that to investigate employed 2 antennas are combination of antennas 1,2, * replace with #, represent this situation.Can see having 2 kinds of situations, as follows:
So, at the 1st circulation time of 30 kinds of situations that data flow c reached best interference diversity effect, be filled in and data flow d reached employed 2 antennas are 2 kinds of situations of combination of antennas 1,2 in the schematic diagram of scheme of best interference diversity effect, and situation 1 is wherein repeated to insert once; Then, at the 2nd circulation time of 30 kinds of situations that data flow c reached best interference diversity effect, be filled in and data flow d reached employed 2 antennas are 2 kinds of situations of combination of antennas 1,2 in the schematic diagram of scheme of best interference diversity effect, and situation 2 is wherein repeated to insert once.
In sum, each cycle period comprises 60 kinds of arrangements, just can reach whole best interference diversity effect, and this scheme than 120 kinds of all under traversal 5 transmit antenna case different arrangements is simple.The above is to the present invention is directed to the employed preferred embodiment of 5 transmitting antenna MIMO systems.Certainly, travel through 120 kinds of all different arrangements and also can realize purpose of the present invention, can constitute suboptimum embodiment of the present invention, but complexity is greater than the preferred embodiment of the present invention of 60 kinds of arrangements of traversal.
In many patterns of code words, there is a day line options, promptly transmitting terminal has M transmitting antenna, and the receiving terminal feedback informs that transmitting terminal uses wherein the individual antenna of K (K is smaller or equal to M) preferably, emission K road signal.After antenna selecting plan was determined, this just was equivalent to the situation of K antenna emission K road signal, thereby can use method of the present invention, reaches whole best interference diversity effect.
Notice in all schematic diagrames of presents that the order of each row of matrix can exchange arbitrarily, and the order of each row of matrix can exchange arbitrarily also, its effect of the new departure that obtains is still identical.
At the situation of mimo system 4 system of transmit antennas, 4 kinds of arrangements of the scheme of high pass traversal; And 12 kinds of arrangements of the solution of the present invention traversal; Perhaps travel through 24 kinds of arrangements.
When the signal of the scheme second layer of high pass or the 3rd layer is launched on a certain fixing antenna, its is formed the antenna set of disturbing fix, have only a kind of combination; The present invention travels through all possible combination, or has experienced two kinds of combinations at least.
The contrast of the probability distribution graph of the scheme second of high pass and the instantaneous channel capacity of the solution of the present invention, simulation result figure as shown in Figure 4.Adopt mimo system of the present invention, the probability distribution of instantaneous channel capacity is more concentrated than the scheme second of high pass.
Among the last figure, abscissa is represented channel capacity, and ordinate is represented probability density function.As can be seen from the figure, compare with the scheme second of Qualcomm Cycling, instantaneous channel capacity has more concentrated distribution under the solution of the present invention of HuaweiCycling.Data analysis shows, the variance of instantaneous channel capacity under the solution of the present invention, little by 9% than the variance of instantaneous channel capacity under the scheme second.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.Should be understood that the variation in these concrete enforcements is conspicuous for a person skilled in the art, do not break away from spiritual protection range of the present invention.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a MIMO multi-code communication method that is used for mimo system is characterized in that,
May further comprise the steps:
Described mimo system transmitting terminal has M transmitting antenna, by K transmission antennas transmit K circuit-switched data stream wherein;
Chnnel coding is independently carried out on each road of described K circuit-switched data stream respectively, and at each symbol period of a TTI, each emission of K transmitting antenna is used at least one road in the K circuit-switched data stream in turn;
Described mimo system receiving terminal adopts interference excision detection technology to receive; And
Thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to circuit-switched data stream forms one or more data flow of disturbing is launched the one or more antennas that made, change at least once along with different symbol periods, to realize interference diversity.
2. MIMO multi-code communication method according to claim 1, it is characterized in that, each symbol period at a TTI, each emission of K transmitting antenna is used on each road in the K circuit-switched data stream in turn, and each road of K circuit-switched data stream uses the pattern of each emission of K transmitting antenna to satisfy following condition in turn: in each symbol period of the symbol of the circuit-switched data stream of determining arbitrarily in by the emission K circuit-switched data stream of determining arbitrarily in K the transmitting antenna, after receiving terminal adopts interference excision detection technology to eliminate the interference of symbol of one or more detected data flow, thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to this circuit-switched data stream forms one or more data flow of disturbing is launched employed one or more antennas, 4 change if can be along with different symbol periods, then change at least once, to realize interference diversity.
3. MIMO multi-code communication method according to claim 2, it is characterized in that, described each symbol period at a TTI, each road of K circuit-switched data stream uses the pattern of each emission of K transmitting antenna to satisfy following condition in turn: in each symbol period of the symbol of the circuit-switched data stream of determining arbitrarily in the emission K circuit-switched data stream of determining arbitrarily in by K transmitting antenna, thereby it disturbs not by interference cancellation techniques and is eliminated still the combination that symbol that symbol to this circuit-switched data stream x forms one or more data flow of disturbing is launched employed one or more antennas, travel through all possible combination, and the number of times that each combination is used is identical as far as possible, to realize optimum interference diversity.
4. MIMO multi-code communication method according to claim 3 is characterized in that, the method for the optimum interference diversity of described realization may further comprise the steps:
In a TTI, ergodic data stream D1, D2 ... Dk and antenna 1,2 ... the institute of k corresponding relation might arrange.
5. MIMO multi-code communication method according to claim 4 is characterized in that, K=5, traversal be arranged as 120 kinds; K=4, traversal be arranged as 24 kinds; K=3, traversal be arranged as 6 kinds.
6. MIMO multi-code communication method according to claim 4 is characterized in that, the method that reaches described optimum interference diversity effect is further comprising the steps of:
In each symbol period in a TTI, use the number of times of each arrangement equal as far as possible.
7. MIMO multi-code communication method according to claim 3 is characterized in that, it is characterized in that, the method that reaches described optimum interference diversity effect comprises following feature:
In a TTI, do not need ergodic data stream D 1, D2 ... Dk and antenna 1,2 ... the institute of k corresponding relation might arrange.
8. MIMO multi-code communication method according to claim 7 is characterized in that, K=5, traversal be arranged as 60 kinds; K=4, traversal be arranged as 12 kinds.
9. MIMO multi-code communication method according to claim 7 is characterized in that, the method that reaches described optimum interference diversity effect is further comprising the steps of:
In each symbol period in a TTI, use the number of times of each arrangement that is traveled through equal as far as possible.
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| CN101540690B (en) * | 2008-03-21 | 2011-09-14 | 华为技术有限公司 | Method and system for MIMO communication of multicast service |
| CN102301617A (en) * | 2009-02-02 | 2011-12-28 | 高通股份有限公司 | Uplink open-loop spatial multiplexing in wireless communications |
| WO2015127770A1 (en) * | 2014-02-28 | 2015-09-03 | 中兴通讯股份有限公司 | Data transmission method, apparatus and system, and computer storage medium |
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| CN102255702B (en) * | 2010-05-17 | 2014-08-20 | 电信科学技术研究院 | MIMO (Multiple Input Multiple Output) mode switching method and device |
| CN112671510B (en) * | 2020-12-21 | 2022-11-18 | 海能达通信股份有限公司 | Channel quality indication feedback method, adaptive modulation coding method and device |
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| US7095709B2 (en) * | 2002-06-24 | 2006-08-22 | Qualcomm, Incorporated | Diversity transmission modes for MIMO OFDM communication systems |
| CN100576769C (en) * | 2005-06-07 | 2009-12-30 | 上海贝尔阿尔卡特股份有限公司 | A kind of devices and methods therefor that in mobile communications network, is used for self-adaptive multi antenna diversity |
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| CN101540690B (en) * | 2008-03-21 | 2011-09-14 | 华为技术有限公司 | Method and system for MIMO communication of multicast service |
| CN102301617A (en) * | 2009-02-02 | 2011-12-28 | 高通股份有限公司 | Uplink open-loop spatial multiplexing in wireless communications |
| WO2015127770A1 (en) * | 2014-02-28 | 2015-09-03 | 中兴通讯股份有限公司 | Data transmission method, apparatus and system, and computer storage medium |
| US10097317B2 (en) | 2014-02-28 | 2018-10-09 | Zte Corporation | Data transmission method, apparatus and system, and computer storage medium |
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