CN101222258A - MIMO multi-code communication method, device and system - Google Patents
MIMO multi-code communication method, device and system Download PDFInfo
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Abstract
The invention provides an MIMO multi-code word communication method, a device and a system used in an MIMO system, and adopts the following technical proposal: the transmitting end of the MIMO system has M transmitting antennas with K transmitting antennas transmit K data flows; the channel coding of each of the K data flows is completed separately and during each symbol period of a TTI, at least one data flow of the K data flows is transmitted through making use of each of the K transmitting antennas in turn; the receiving end of the MIMO system realizes receive through adopting interference eliminating detection technology; moreover, the symbols of one or more data flows with the interference not eliminated through interference eliminating technology and still interfering the symbol of one data flow are combined by one or more antennas used in transmitting and are changed at least one time along with different symbol periods, thereby realizing interference diversity; thus, the variance of instant channel capacity variation of each data flow influenced by interference diversity effect is reduced; therefore, under the channel condition of higher probability of CQI feedback erasure, when the transmitting end estimates the CQI of the current TTI according to the CQI fed back by the receiving end at one or more previous CQI feedbacks as CQI feedback erasure occurs so as to determine the MCS used by one or more corresponding data flows of the current TTI, the estimated error is smaller, thereby causing less damage.
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-InputMultiple-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
MRespectively 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
MProcessed 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:
The white paper C30-20060731-040_HKLLMNQRSUZ_PP2Phase2_FDD_Proposal_v1.9 of the 3GPP2AIE standardization body on July 31st, 2006 (Joint Proposal for 3GPP2 PhysicalLayer for FDD Spectra) has 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.A plurality of pre-coding matrixes have been defined in the design of existing a kind of MIMO precoding technique scheme and pre-coding matrix, the receiving terminal feedback is the sequence number of an optimum pre-coding matrix wherein, 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 3GPP2 AIE (being UMB) 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 channel coding 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, a packet uses 8 continuous OFDM symbols on the time domain, each OFDM symbol takies 16 continuous on frequency domain subcarriers, 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 in the motion of 3GPP2 AIE standardization body in certain company,, the superiority of scheme second has been described by the comparison of scheme first and scheme second.In scheme first and scheme second, if adopt a, b, c, d to 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.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.Each different subcarrier in the ofdm communication system is shown in each tabulation of following 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.
As seen, 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 compares with the scheme second that circulation is arranged, and the variance that the instantaneous channel capacity of each data flow changes under the scheme first that does not have to circulate greatly.Simultaneously, under scheme first and scheme second, the average of the instantaneous channel capacity of each data flow is identical.
In the defined MCW pattern of 3GPP2AIE (being UMB) standard, K CQI of receiving terminal feedback, and the probability of erasure (the CQI feedback erasure rate) of CQI feedback is than higher, and 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 described current only modulation 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, the loss that causes is also less, therefore, is not difficult to find out the advantage of scheme second.The simulation result that the contrast of the probability distribution graph of the instantaneous channel capacity of scheme first and scheme second obtains as shown in Figure 2.
In 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.
In realizing process of the present invention, the inventor finds: if 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 embodiment of the invention provides a kind of MIMO multi-code communication method, Apparatus and system, is intended to by adopting the method for interference diversity, thereby makes the distribution of the instantaneous channel capacity of some data flow can be more concentrated.
A kind of MIMO multi-code communication method that is used for mimo system comprises:
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 Transmission Time Interval 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
At transmitting terminal, thereby disturb for it and not to be received end and to eliminate still the combination that symbol that symbol to a certain circuit-switched data stream forms one or more data flow of disturbing is launched employed one or more antennas by interference cancellation techniques, change at least once along with different symbol periods, to realize interference diversity.
A kind of many code words of MIMO communication system comprises:
Transmitting terminal, comprise 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, at each symbol period of a Transmission Time Interval TTI, each emission of K transmitting antenna is used at least one road in the K circuit-switched data stream in turn; And, thereby be launched the combination of employed one or more antennas for the symbol that can't form one or more data flow of disturbing at receiving terminal by the symbol that the interference cancellation techniques elimination is still flowed a certain circuit-switched data, change at least once along with different symbol periods, to realize interference diversity;
Receiving terminal, described mimo system receiving terminal adopt interference excision detection technology to receive.
By technique scheme as can be seen, the embodiment of the invention has realized following technique effect:
By the employing of interference diversity technology, make that the distribution of instantaneous channel capacity of data flow can be more concentrated, thereby can improve the performance of the many code words communications of MIMO.
The further feature of the embodiment of the invention and advantage will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the embodiment of the invention.The purpose of the embodiment of the 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 the further understanding to the embodiment of the invention, constitutes the application's a part, and the illustrative examples of the embodiment of the 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;
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;
The system configuration schematic diagram one that Fig. 5 provides for the embodiment of the invention;
The system configuration schematic diagram two that Fig. 6 provides for the embodiment of the invention.
Embodiment
The embodiment of 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;
Wherein, at each symbol period of 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 in by K transmitting antenna, determining arbitrarily (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 and to be 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 by interference cancellation techniques and can to change along with different symbol periods, and change at least once, thereby can reach the effect of interference diversity; Specifically can adopt following dual mode to realize described variation:
(1) mode one: 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 can comprise: in a TTI, and ergodic data stream D1, D2, Dk and antenna 1,2 ... the k corresponding relation might arrange (arrangement that is a plurality of antennas).
In above-mentioned MIMO multi-code communication method, antenna amount M=5, traversal be arranged as 120 kinds; Antenna amount M=4, traversal be arranged as 24 kinds; Antenna amount M=3, traversal be arranged as 6 kinds.
In above-mentioned MIMO multi-code communication method, a kind of method that reaches the effect of above-mentioned optimum interference diversity can also comprise: in each symbol period in a TTI, use the number of times of each arrangement equal as far as possible.
(2) mode two: the method that the embodiment of the invention provides also can not travel through might arrange and reach the effect of above-mentioned optimum interference diversity, but travel through less arrangement (promptly part is arranged) to reach the effect of corresponding optimum interference diversity.In above-mentioned MIMO multi-code communication method, antenna amount M=5, being arranged as 60 kinds and getting final product of traversal; Antenna amount M=4, being arranged as 12 kinds and getting final product of traversal will provide the specific implementation that concrete selection is partly arranged in subsequent descriptions.Doing like this can be so that implementation procedure be simpler, and simultaneously, in each symbol period in a TTI, the degree that can also make the number of times that uses each arrangement equate is higher.
As seen, adopt the mimo system of the embodiment of the invention, during M=3, more concentrated than scheme second of the prior art in the probability distribution of the instantaneous channel capacity of the 2nd detected data flow b of receiving terminal; During M=4, more concentrated than scheme second of the prior art 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 scheme second of the prior art 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.Note, in the described motion, the embodiment of scheme second when only having provided M=4, and the embodiment when M=3 and M=5 does not provide, and still analogizes easily to obtain.
In the embodiment of the invention, receiving terminal can also feed back the information of K CQI (channel quality indication) to transmitting terminal, and a described K CQI is corresponding one by one with described K circuit-switched data stream, is used to indicate each road that described K circuit-switched data flows at channel quality that current TTI experienced.Wherein, arrive transmitting terminal behind noisy channel of information via of K CQI of receiving terminal emission.
Transmitting terminal just can be according to received K CQI value behind K the CQI that receives by the receiving terminal feedback, and each road that determines the K circuit-switched data stream that corresponding transmitting terminal is launched is at the MCS of current TTI (modulation and channel coding schemes); Specifically can adopt following scheme to carry out the estimation of the MCS of current TTI:
After transmitting terminal receives K the CQI that is fed back by receiving terminal, if judge that in K the received CQI value at least one is unreliable, then corresponding transmitting terminal will be according to the MCS of the corresponding at least one circuit-switched data stream of described insecure at least one CQI value decision in current TTI, but estimate the MCS of described at least one circuit-switched data stream in the CQI value that receives of before this one or several TTI in current TTI according to transmitting terminal, perhaps, also can estimate the MCS of described at least one circuit-switched data stream at the MCS of before this one or several TTI according to described at least one circuit-switched data stream in current TTI.Alternatively, judge that accordingly the unreliable transmitting terminal that is meant of in received K the CQI value at least one judges that at least one the signal to noise ratio in K the received CQI value is lower than a given threshold values.
In the embodiment of the invention, described transmitting terminal is judged the probability that at least one the insecure incident in K the received CQI value takes place, greater than a specified value; Wherein, this specified value can for: 5%, perhaps, 10%, perhaps, 40%, perhaps, 50%.
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the embodiment of the 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, the mimo system transmitting terminal has M transmitting antenna, select K transmission antennas transmit K circuit-switched data stream wherein, and, thereby disturb the combination of not eliminating one or more data flow employed one or more antennas when being launched that still formation is disturbed to circuit-switched data stream by interference cancellation techniques to change at least once for it along with different symbol periods at receiving terminal;
In this step, flow through the condition that needs in the journey to satisfy in emission K circuit-switched data and specifically can comprise:
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, the possible combination of traversal all or part;
Alternatively, adopting the possible combination of described all or part to send in the process of data flow, the number of times that can make each combination be used is identical as far as possible, to reach the effect of optimum interference diversity.
In this step, 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.
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, because the radiation pattern that adopts in step S10 makes the effect that can reach preferable interference diversity at receiving terminal.
In the MIMO of prior art multi-code communication method, 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.Like this, 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), thereby can reach the effect of interference diversity (diversity).
In embodiments of the present invention, if all possible combination of traversal promptly reaches the variation maximum times, then 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, also 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 the application of the embodiment of the invention below at this situation.
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.
At the MCW scheme described in the AIE motion C30-20061030-070, be above-mentioned scheme second, in the embodiment of the invention, can further make improvements, thereby make that the distribution of instantaneous channel capacity of some data flow can be more concentrated by the method that adopts interference diversity.
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 at least once, then can reach the effect of interference diversity; If all possible combination of traversal, and the number of times that each combination is used is identical as far as possible, then can reach the effect of optimum interference diversity.
Be example with aforesaid scheme second below, the embodiment of the embodiment of the 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:
As can be seen, in these 24 kinds of arrangements, when data flow b adopted antenna 2 to send, corresponding data flow c, d are no longer fixing to be sent by antenna 3,4, but various two combination of antennas that are made of other each antennas 1,3,4 send.
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, and only adopt part wherein to arrange, just can guarantee when the symbol of certain data flow is launched by some definite antennas, thereby launching it disturbs not to be eliminated still by interference cancellation techniques its is formed the employed one or more emitting antenna combination of symbol of one or more data flow of disturbing along with different symbol periods changes, and travel through all possible combination, to realize preferable interference diversity effect, the specific implementation process of this method of will 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 | Antenna | 3 | |
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| Interfering data | Antenna | 1 | |
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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 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.Notice that coupling is to (m n) is comprised
With
The corresponding relation of the row identical with two * occupy-places in the schematic diagram of the scheme that data flow b is reached best interference diversity effect can be arbitrarily.Detailed process is as follows:
(1) coupling is inserted schematic diagram to (3,4)
This scheme above the embodiment of the invention is used.As previously mentioned, coupling is to (m n) is comprised
With
The corresponding relation of the row identical with two * occupy-places in the schematic diagram of the scheme that data flow b is reached best interference diversity effect can be arbitrarily, so the mode that coupling is inserted schematic diagram to (3,4) also can be:
(2) again coupling is inserted schematic diagram to (1,4)
This scheme above the embodiment of the invention is used.Principle as previously mentioned, the mode that coupling is inserted schematic diagram to (1,4) also can be
(3) again coupling is inserted schematic diagram to (1,3)
This scheme above embodiments of the invention use.Principle as previously mentioned, mating to (1,3) mode of inserting schematic diagram also can be another kind of, revise antenna 3 and antenna 1 as the antenna that data flow c, d with the 3rd row use, and the antenna that data flow c, the d of the 8th row uses revised antenna 1 and antenna 3, for the professional person of this area, be easy to obtain that this is a kind of, just repeat no more.
(4) again coupling is inserted schematic diagram to (2,4)
This scheme above embodiments of the invention use.Principle as previously mentioned, mating to (2,4) mode of inserting schematic diagram also can be another kind of, revise antenna 4 and antenna 2 as the antenna that data flow c, d with the 4th row use, and the antenna that data flow c, the d of the 11st row uses revised antenna 2 and antenna 4, for the professional person of this area, be easy to obtain that this is a kind of, just repeat no more.
(5) again coupling is inserted schematic diagram to (1,2)
This scheme above embodiments of the invention use.Principle as previously mentioned, mating to (1,2) mode of inserting schematic diagram also can be another kind of, revise antenna 2 and antenna 1 as the antenna that data flow c, d with the 6th row use, and the antenna that data flow c, the d of the 9th row uses revised antenna 1 and antenna 2, for the professional person of this area, be easy to obtain that this is a kind of, just repeat no more.
(6) again coupling is inserted schematic diagram to (2,3)
This scheme above embodiments of the invention use.Principle as previously mentioned, mating to (2,3) mode of inserting schematic diagram also can be another kind of, revise antenna 3 and antenna 2 as the antenna that data flow c, d with the 7th row use, and the antenna that data flow c, the d of the 12nd row uses revised antenna 2 and antenna 3, for the professional person of this area, be easy to obtain that this is a kind of, just repeat no more.
Obtained the scheme of last embodiment 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.
Can know from the construction process of the scheme of above-mentioned last embodiment, each coupling to (m n) is comprised
With
Insert when data flow b reached the schematic diagram of scheme of best interference diversity effect, two kinds of possible realizations are all arranged.So 6 above-mentioned couplings to (m n) is comprised
With
Insert when data flow b reached the schematic diagram of scheme of best interference diversity effect; possible implementation has 2 * 2 * 2 * 2 * 2 * 2=64 kind; these 64 kinds of schemes all are to use the principle of the embodiment of the invention to obtain, thereby all within protection scope of the present invention.
These 64 kinds of schemes obtain like this, and the 1st coupling when inserting schematic diagram, had two kinds of possible realizations, are designated as (I
1, I
2).The 2nd coupling when inserting schematic diagram, there are two kinds of possible realizations, are designated as (II
1, II
2).Accordingly the 3rd, 4,5 and 6 coupling when inserting schematic diagram, each have two kinds of possible realizations, be designated as (III respectively
1, III
2), (IV
1, IV
2), (V
1, V
2), (VI
1, VI
2).See easily, insert the 1st and the 2nd coupling to after, possible scheme has 2 * 2=4 kind, i.e. scheme I
1II
1, I
1II
2, I
2II
1, I
2II
2, I wherein for example
2II
1Expression is inserted the 1st coupling to using I
2Realize and insert the 2nd coupling using II
1The scheme that realizes; Insert the 1st, the 2nd and the 3rd coupling to after, possible scheme has 2 * 2 * 2=8 kind, i.e. scheme I
1II
1III
1, I
1II
2III
1, I
2II
1III
1, I
2II
2III
1, I
1II
1III
2, I
1II
2III
2, I
2II
1III
2, I
2II
2III
2, I wherein for example
2II
1III
2Expression is inserted the 1st coupling to using I
2Realize, insert the 2nd coupling using II
1The scheme that realizes, and insert the 3rd coupling to using III
2The scheme that realizes.Can be extrapolated to thus more pairing coupling filling out simultaneously, checking easily, in all 24 kinds different arrangements, remove after at least 12 kinds of different arrangements of the above-mentioned necessary a group of scheme that reaches best interference diversity effect, remaining 12 kinds of arrangements, must still reach at least 12 kinds of different arrangements of the necessary other a group of scheme of best interference diversity effect, promptly travel through the scheme of 12 kinds of arrangements of above-mentioned remainder, still be the scheme that reaches best interference diversity effect.We can verify this point for example.
All 24 kinds different arrangements: remove the above-mentioned necessary at least 12 kinds of different arrangements of scheme that reach best interference diversity effect, i.e. Xia Mian 12 kinds of arrangements are designated as group one,
We obtain 12 kinds of remaining arrangements then, are designated as group two, promptly
Because after receiving terminal adopts interference cancellation techniques, first is detected and eliminate the data flow a of its interference, detection to follow-up data flow b and c does not constitute interference, so a is replaced with, and represents the symbol of current data to be tested stream is not formed interference, is not considered that thus the schematic diagram of interference of a is as follows
Data flow c and d constitute interference to the detection of data flow b, thus c and d are replaced with *, and * represents the symbol of current data to be tested stream is formed interference, obtains thus
By last figure as can be seen, for the detection of data flow b, this scheme has reached the effect of optimum interference diversity, promptly when b uses a certain fixing antenna to launch, b is formed the employed emitting antenna combination of disturbing that transmits travel through all possible combination.
Data flow d constitutes the detection of data flow c and disturbs, and data flow b does not constitute interference to the detection of data flow c, so in the schematic diagram of the interference of not considering a d is replaced with * and b is replaced with, obtains:
By last figure as can be seen, for the detection of data flow c, this scheme has also reached the effect of optimum interference diversity, promptly when c uses a certain fixing antenna to launch, c is formed the employed emitting antenna combination of disturbing that transmits travel through all possible combination.Thereby we have verified in all 24 kinds different arrangements, remove after the above-mentioned necessary at least 12 kinds of different arrangements of scheme that reach best interference diversity effect, remaining 12 kinds of arrangements, must still reach the necessary at least 12 kinds of different arrangements of scheme of best interference diversity effect.
In sum, as can be seen, the embodiment of the invention has two and can select the implementation used for the situation of 4 data flow of emission: one is 24 kinds of all arrangements of traversal, and every kind of number of times of arranging use is equal as far as possible in a TTI, is designated as option A; Another kind is the above-mentioned 12 kinds of specific arrangements of traversal, and every kind of number of times of arranging use is equal as far as possible in a TTI, is designated as option b.
In the realization of reality, can also two kinds of above-mentioned schemes be combined, now as follows: as to suppose to comprise in 1 TTI 24*4+12=108 symbol period for an embodiment, so, can in 1 TTI, travel through 24 kinds of all arrangements 4 times earlier, take 24*4=96 symbol period, at 12 symbol periods of remainder, travel through above-mentioned 12 kinds of specific arrangements then.Find out that easily this scheme has reached the effect of optimum interference diversity,, traveled through all 24 kinds of arrangements and every kind of number of times of arranging use according to first kind of scheme and equated because in a described 24*4=96 symbol period; And in 12 symbol periods of remainder, traveled through above-mentioned specific 12 kinds of arrangements and every kind of number of times of arranging use according to second kind of scheme and equated.
The symbol period that comprises in common 1 TTI is counted not necessarily 24 or 12 integral multiple of y.As mentioned above, if adopt the scheme of 24 kinds of all arrangements of traversal, so after traveling through repeatedly, when the symbol period number deficiency 24 of remainder but greater than 12, can travel through above-mentioned 12 kinds of specific arrangements 1 time according to second kind of scheme more so, remaining like this symbol period number is inevitable less than 12; And if adopt the scheme of above-mentioned 12 kinds of specific arrangements, so traversal repeatedly after, when the symbol period number deficiency of remainder when traveling through one time again, remaining symbol period number is inevitable also less than 12.So count the situation that y is not 24 or 12 integral multiple for the symbol period that comprises in 1 TTI, we only need to consider that symbol period number remaining after traversal repeatedly is less than 12 situation.
At this moment, we are the symbol period number scale of remainder x, x be y divided by 12 remainders that obtain, inevitable less than 12.Hereinafter be given in the scheme that traversal is arranged in x the remaining symbol period, this scheme can reach optimum effect.
This scheme need satisfy, and in this x symbol period, the x kind that experienced is arranged, and must be different x kind in the 12 kinds of arrangements comprising of the option b of the above-mentioned 12 kinds of specific arrangements of traversal.As previously mentioned, option b can have 64 kinds of different realizations, gets wherein any one and realizes that 12 kinds of arrangements being adopted get final product.
X more than or equal to 4 situation under, at a described x symbol period, 4 arrangements of per 4 symbol periods traversal also need to satisfy such principle: in these 4 arrangements, each data flow has all traveled through 4 all transmitting antennas, and promptly each data flow each employed transmitting antenna in these 4 arrangements all has nothing in common with each other.Specific 12 kinds of realizing being traveled through of the option b of being lifted with the embodiment of the invention a kind of are arranged as example below, provide the embodiment of above-mentioned technology.
The option b that the embodiment of the invention is lifted a kind of realizes 12 kinds of specific arrangements of being traveled through promptly being designated as 12 kinds of arrangements of group one as mentioned before, and be as follows:
The 1st arrangement supposing certain 4 symbol period traversal in above-mentioned described x the symbol period (x＞4) is
The principle that all has nothing in common with each other according to each data flow each employed transmitting antenna in these 4 arrangements so, in other 3 arrangements of these 4 symbol periods traversals, inevitable can be in the element and the arrangement of delegation arbitrarily
Element at this row is identical, and each arrangement that excludes thus is as shown below, beat in the pairing row of the arrangement that is excluded-element be exactly and arrangement
At the identical element of element of going together mutually.
After deleting each arrangement of showing-be excluded in above-mentioned place, obtain
Among the figure the 1st selected arrangement is placed on outside [].
In [], the arrangement that Tong Hang element is identical cannot coexist mutually, and they are row (1) (3), row (1) (4), row (1) (2), row (1) (4) (5), row (2) (5), row (3) (5), row (4) (5).Because (1) can not coexist, get rid of (1), so in the Sheng Xia row (2) (3) (4) (5) with all row, incompatible is row (2) (5), row (3) (5), row (4) (5), because (5) can not coexist, get rid of (5), so obtain 4 arrangements with all remaining row
They satisfy the principle that each data flow each employed transmitting antenna in these 4 arrangements all has nothing in common with each other.
In a kind of 12 kinds of specific arrangements that realize being traveled through of such scheme B, remove 4 above-mentioned arrangements after, 8 remaining arrangements are as follows:
The similar method of method of 4 above-mentioned arrangements is tried to achieve in employing, then can be divided into 2 groups in the hope of these 8 arrangements, every group has 4 arrangements in 4 arrangements and the group to satisfy the principle that each data flow each employed transmitting antenna in these 4 arrangements all has nothing in common with each other.These two groups are respectively:
Can know by top narration, x greater than 4 situation under, at a described x symbol period, 4 arrangements of per 4 symbol periods traversal can be above-mentioned group one, groups two and organize any one group of 4 arrangement that comprised in three.
More specifically, x more than or equal to 8 situation under, in the above-mentioned group one of 4 symbol periods traversal, group two with organize in three any one group of 4 arrangement that comprised and for example organize two, again in other 4 symbol periods traversal above-mentioned group one, group two and organize in three any one group of 4 arrangement that comprised and for example organize except the group (for example organizing two) that has traveled through, last (x-8) individual symbol period, traversal except two groups having traveled through (for example organize two, group one) above-mentioned group one, organize two and to organize in three in any one group of 4 arrangement that comprised arbitrarily (x-8) individual.
X more than or equal to 4 less than 8 situation under, in the above-mentioned group one of 4 symbol periods traversal, group two with organize in three any one group of 4 arrangement that comprised and for example organize two, last (x-4) individual symbol period, traversal except two groups having traveled through (for example organize two, group one) above-mentioned group one, organize two and to organize in three in any one group of 4 arrangement that comprised arbitrarily (x-4) individual.
X less than 4 situation under, at x symbol period, travel through above-mentioned group one, group two and organize in three in any one group of 4 arrangement that comprised x arbitrarily.
Above-mentionedly be meant in certain adjacent 4 symbol period of time-domain or frequency domain (promptly not to be 4 symbol periods arbitrarily at 4 symbol periods, but 4 adjacent symbol periods), the transmitting antenna that each data flow is used has nothing in common with each other, corresponding concrete processing can comprise: in a TTI, begin in 4 adjacent symbol periods of the time-domain that experienced or frequency domain from certain symbol period, the transmitting antenna that each data flow is used has nothing in common with each other; From with above-mentioned 4 symbol periods at least one in 4 adjacent symbol periods of time-domain that the adjacent some symbol periods of time-domain or frequency domain begin to be experienced or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other; So many groups time-domain or 4 adjacent symbol periods of frequency domain of experience all satisfy above-mentioned condition successively, and remaining symbol period number is less than 4 in a described TTI.
Can also divide processing accordingly to 12 kinds of arrangements that are designated as group two as mentioned before equally, 12 kinds of arrangements of described group two are as follows:
Employing and 12 kinds of arrangements of group one are divided into the identical method of above-mentioned three groups method, can also be divided into 3 groups to 12 kinds of arrangements of group two, and are specific as follows:
As seen, three of this group two groups also satisfy every group have 4 arrange and group in 4 arrangements satisfy the principle that each data flow each employed transmitting antenna in these 4 arrangements all has nothing in common with each other.
In addition, in the MIMO+OFDM of reality channel, channel situation gradually changes along time-domain and frequency domain.Promptly, a plurality of symbol periods that time-domain and frequency domain are adjacent, think that channel situation is constant in these symbol periods though can be similar to, it is more little to be actually two symbol periods distance on time-domain and frequency domain, and the channel situation difference of these two symbol periods is more little.Such as using 8 continuous OFDM symbols on the time domain at an aforementioned packet, each OFDM symbol takies in the communication plan of 16 continuous on frequency domain subcarriers, though the variation in 128 symbol periods of channel situation on described 8 OFDM symbols and 16 subcarriers of thinking that can be similar to can be ignored, in fact, be positioned at two symbol periods of same OFDM symbol and adjacent sub-carrier, and being positioned at two symbol periods of same subcarrier and adjacent OFDM symbol, the variation of channel is very little; And in two bigger symbol periods of time domain or frequency domain interval, the variation of channel is bigger.
Thereby, in order to reach better diversity, in all 24 kinds of arrangements processes repeatedly of traversal, perhaps reach in 12 kinds of arrangements process repeatedly of optimum interference diversity effect in traversal, when traveling through 24 kinds of arrangements or 12 kinds of arrangements each time, comprised 24 kinds or 12 kinds of arrangements are traveled through according to random order, but satisfy in 4 arrangements in continuous 4 symbol periods of frequency domain or time-domain, being experienced each, the principle that the employed transmitting antenna of each data flow all has nothing in common with each other.Attention is in actual communication systems, and some symbol period is used to launch frequency pilot sign, thereby can not be used for transmitted data symbols; Also non-conterminous physically for two symbol periods that certain two data symbol is shared, but the interval is useful on the situation of one or more symbol period (generally being a symbol period) of emission frequency pilot sign, and we think that also two shared symbol periods of described two data symbols are continuous.
When adopting option b, reach in 12 kinds of arrangements process repeatedly of optimum interference diversity effect, satisfy the method for mentioned above principle and introduce hereinafter in 12 continuous symbol period traversals.When 12 kinds of used arrangements are exactly that preamble option b that the described embodiment of the invention is lifted a kind of realizes 12 kinds of specific arrangements of being traveled through, that is,
Described by preamble, these 12 kinds of arrangements can be divided into 3 groups, and every group comprises 4 different arrangements, and the principle that each data flow each employed transmitting antenna in these 4 arrangements all has nothing in common with each other is satisfied in 4 arrangements in every group.These three groups are as follows:
So, reach in 12 kinds of arrangements process repeatedly of optimum interference diversity effect each time in traversal, all 4 any one group arrangements in above three groups of traversal in continuous 4 symbol periods of time-domain or frequency domain, in continuous 4 symbol periods of ensuing time-domain or frequency domain, remove 4 any one group arrangements in the group remaining beyond a group that has been traveled through again in above three groups of traversal, in continuous 4 symbol periods of ensuing time-domain or frequency domain, remove at last 4 arrangements in unique a group remaining beyond two groups that have been traveled through in above three groups of traversal, to finish once traversal to described 12 kinds of arrangements.
When in continuous 4 symbol periods of time-domain or frequency domain in above three groups of traversal a certain group 4 arranged, the order of these 4 arrangements can change arbitrarily and smaller to the influence of systematic function.Yet, in order to reach better diversity, need to satisfy two used arrangements in two adjacent symbol cycles between two adjacent groups, also satisfy the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other.
As shown below, suppose that each order of arranging traversal is exactly according to the order among the last figure in the group, and in one section continuous symbol period according to group one, group two with organize 12 arrangements of three sequencing traversal, and in the continuous symbol period of next section again according to group one, group two with organize 12 arrangements of sequencing traversal of three, its schematic diagram is as follows so:
By last figure as can be seen, two adjacent symbol cycles between two adjacent groups comprise: the 4th symbol period of the 4th symbol period of group one and the 1st symbol period of group two, group two and organize the 4th symbol period of three the 1st symbol period, group three and organize one the 1st symbol period.See easily, wherein, do not satisfy the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other only in two arrangements of the 1st symbol period of the 4th symbol period of group three and group one.So our the 4th used arrangement of symbol period by exchange group three accordingly and organize three the 2nd the used arrangement of symbol period, order with 4 used 4 arrangements of symbol period of adjustment group three, make in two arrangements of the 1st symbol period of the 4th symbol period of group three and group one, also satisfy the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other.Adjusted result is as follows:
Similarly, as previously mentioned, traversal aforesaid 12 kinds arrange or 24 kinds of arrangements repeatedly after, in the symbol period of the number of the less than 12 of remainder, travel through 0 or several groups as previously mentioned, travel through under in certain group 0 or the situation of several arrangements, the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other is also satisfied in two used arrangements in two adjacent symbol cycles between two adjacent groups again.
Generally speaking, in order to reach better diversity, need two used arrangements in adjacent any two symbol periods of time domain or frequency domain, satisfy the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other as far as possible.
When next introduce adopting option A, travel through in all 24 kinds of arrangements processes repeatedly, satisfy in 4 arrangements in 4 continuous symbol periods, being experienced each, the method for the principle that the employed transmitting antenna of each data flow all has nothing in common with each other.Described by preamble, can be in all 24 kinds different arrangements, find out the necessary at least 12 kinds of different arrangements of the scheme that reaches best interference diversity effect, they are designated as group one, in all 24 kinds different arrangements, remove then after group's 12 kinds of arrangements of one remaining 12 kinds of arrangements, must still reach at least 12 kinds of different arrangements of the necessary other a group of scheme of best interference diversity effect, be designated as group two.
Thereby, travel through in all 24 kinds of arrangements processes repeatedly, can travel through among two above-mentioned groups earlier, travel through the another one among two above-mentioned groups again, such as according to group two, group one, group two, group one ... mode travel through.As previously mentioned, 12 kinds of arrangements that each comprised among two groups can be divided into 3 groups, every group comprises 4 different arrangements, and the principle that each data flow each employed transmitting antenna in these 4 arrangements all has nothing in common with each other is satisfied in 4 arrangements in every group.
Thereby, in each process of 12 arrangements in 12 continuous some groups of symbol period traversal each, all 4 any one group arrangements in above-mentioned three groups of traversal in continuous 4 symbol periods of time-domain or frequency domain, in continuous 4 symbol periods of ensuing time-domain or frequency domain, remove 4 any one group arrangements in the group remaining beyond a group that has been traveled through again in above three groups of traversal, in continuous 4 symbol periods of ensuing time-domain or frequency domain, remove at last 4 arrangements in unique a group remaining beyond two groups that have been traveled through in above three groups of traversal, to finish once traversal to described 12 kinds of arrangements.
When in three groups that any one group of traversal comprises in continuous 4 symbol periods of time-domain or frequency domain a certain group 4 arranged, the order of these 4 arrangements can change arbitrarily and smaller to the influence of systematic function.Yet, in order to reach better diversity, need to satisfy two used arrangements in two adjacent symbol cycles between two adjacent groups, also satisfy the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other.Note because adopted according to group two, group one, group two, group one ... mode travel through, so need to satisfy two used arrangements in two two adjacent symbol cycles between the adjacent group, also satisfy the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other; Promptly the employed transmitting antenna of each data flow has nothing in common with each other between the arrangement of first symbol period of the arrangement of last symbol period of group two and group one, and the employed transmitting antenna of each data flow has nothing in common with each other between the arrangement of the arrangement of last symbol period of group one and first symbol period of groups two.As a comparison, when noticing that following 12 arrangements of option b travel through repeatedly, owing to and then begin traversal for the second time after 12 arrangements travel through once, first of last of these 12 arrangements and these 12 arrangements is adjacent on time or frequency domain, all has nothing in common with each other thereby need satisfy each data flow each employed transmitting antenna in these two arrangements.
As previously mentioned, after traversal described 24 kinds of arrangements repeatedly during when remaining symbol period number deficiency 24, if 12 kinds of arrangements that remaining symbol period number, then travels through aforesaid satisfied optimum interference diversity greater than 12 once, up to the number deficiency 12 of remaining symbol period.The principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other is also satisfied in two used arrangements in two adjacent symbol cycles between this moment two adjacent groups as far as possible.
Provide below according to these above principles, sum up at an aforementioned packet and use 8 continuous OFDM symbols on the time domain, each OFDM symbol takies in the communication plan of 16 continuous on frequency domain subcarriers, the preferred embodiments of the present invention.Figure below is represented a kind of a kind of mode of 128 symbol periods numberings on described 8 OFDM symbols and 16 subcarriers, this numbering only represents that two adjacent symbol periods of sequence number are inevitable in time or adjacent on the frequency domain, the numbering that satisfies this condition has a variety of, this paper is wherein a kind of numbering only, provides embodiment.
The mode one of 128 symbol period numberings
At first provide the preferred embodiment of the present invention program B.In 128 symbol periods, can be at the 1st to the 120th symbol period, traveling through described 12 kinds of reaching optimum interference diversity arranges 10 times, in each traversal described 12 kinds when arranging, as previously mentioned, travel through aforesaid group's one group one, group two successively and organize three, the order of 4 used 4 arrangements of symbol period of attention group three has been done aforesaid adjustment, and is all different with the transmitting antenna that satisfies each stream use of two adjacent symbol periods.
Then at 128-120=8 symbol period of remainder, traversal group one once, traversal group two is once again.Do not have remaining number among this embodiment less than 4 x symbol period, if having, then again according to the 1st in the symbol period sequence number from small to large traversal group three successively up to x symbol period.Why not getting x arrangement arbitrarily from organizing three, but only get x arrangement of front successively, is that to satisfy the transmitting antenna that each stream of two adjacent symbol periods uses all different because the order of group 4 used 4 arrangements of symbol period of three has been adjusted to.
Provide the preferred embodiment of the present invention program A below again.In 128 symbol periods, can travel through 24 kinds of all arrangements 5 times at the 1st to the 120th symbol period.During 24 kinds of arrangements of each traversal, all be to travel through described group one earlier, travel through described group two again, detailed a kind of being achieved as follows:
Therefore, following two arrangements that are positioned at the adjacent-symbol cycle, i.e. first arrangement of last arrangement of group one group three and group's two group one, and first arrangement of last arrangement of group two group one and group's two group two, do not satisfy all different requirement of transmitting antenna of each stream use of two adjacent symbol periods.For this reason, group one interior each that needs to adjust group two arranged the order that is traveled through, and the scheme after being improved after the adjustment is as follows:
Scheme after the above-mentioned improvement satisfies all different requirement of transmitting antenna that each stream of two adjacent symbol periods uses.
Afterwards, at 128-120=8 symbol period of remainder, the group one of ergodic group one once, the group two of ergodic group one is once again.Do not have remaining number among this embodiment less than 4 x symbol period, if having, then again according to the 1st in the group three of symbol period sequence number from small to large ergodic group one successively up to x symbol period.Perhaps, at 8 symbol periods of described remainder, several groups that also can ergodic group two only need satisfy all different the getting final product of transmitting antenna that each stream of two adjacent symbol periods uses.
Among the aforesaid embodiment, 12 kinds of arrangements of group one are 12 kinds of arrangements that reach optimum interference diversity effect, are to flow under the situation detected according to the sequencing of a, b, c, d in described 4 circuit-switched data just to be verified establishment.And easily checking, according to antipodal sequencing, promptly according under the detected situation of the sequencing of d, c, b, a, 12 kinds of arrangements of group one remain 12 kinds of arrangements that reach optimum interference diversity effect at described 4 circuit-switched data stream.Described sequencing according to d, c, b, a is detected, be meant that receiving terminal at first detects data flow d and uses testing result to eliminate the interference of d, secondly receiving terminal detects data flow c and uses testing result to eliminate the interference of c, after this receiving terminal detects data flow b and uses testing result to eliminate the interference of b, and last receiving terminal detects data flow a.Describe in detail in the process paragraph below of checking.
As previously mentioned, 12 kinds of arrangements of group one are as follows:
Because after receiving terminal adopts interference cancellation techniques, first is detected and eliminate the data flow d of its interference, detection to follow-up data flow c does not constitute interference, so d is replaced with, and represents the symbol of current data to be tested stream is not formed interference, is not considered that thus the schematic diagram of interference of d is as follows
Data flow b and a constitute interference to the detection of data flow c, thus b and a are replaced with *, and * represents the symbol of current data to be tested stream is formed interference, obtains thus
By last figure as can be seen, for the detection of data flow c, this scheme has reached the effect of optimum interference diversity, promptly when c uses a certain fixing antenna to launch, c is formed the employed emitting antenna combination of disturbing that transmits travel through all possible combination.
Data flow a constitutes the detection of data flow b and disturbs, and data flow c does not constitute interference to the detection of data flow b, so in the schematic diagram of the interference of not considering d a is replaced with * and c is replaced with, obtains:
By last figure as can be seen, for the detection of data flow b, this scheme has also reached the effect of optimum interference diversity, promptly when b uses a certain fixing antenna to launch, b is formed the employed emitting antenna combination of disturbing that transmits travel through all possible combination.Thereby we have verified at described 4 circuit-switched data stream according to antipodal sequencing, and promptly according under the detected situation of the sequencing of d, c, b, a, 12 kinds of arrangements of group one remain 12 kinds of arrangements that reach optimum interference diversity effect.
And before this we empirical tests in all 24 kinds different arrangements, remove after the necessary at least 12 kinds of different arrangements of the scheme that reaches best interference diversity effect, remaining 12 kinds of arrangements, must still reach the necessary at least 12 kinds of different arrangements of scheme of best interference diversity effect.So, reasoning obtains easily, and also checking easily, flows according to antipodal sequencing in described 4 circuit-switched data, promptly according under the detected situation of the sequencing of d, c, b, a, 12 kinds of arrangements of group two also remain 12 kinds of arrangements that reach optimum interference diversity effect.And as previously mentioned, 12 kinds of arrangements of group two are as follows:
Need to prove, at above-mentioned symbol period 1 and 32,2 and 31, and 3 and 30 wait each to symbol period, though sequence number is not continuous, but be adjacent in fact,, then can reach symbol period continuous on such time domain for optimizing embodiment more in time domain, also satisfy the described mentioned above principle of the embodiment of the invention, specific embodiment repeats no more.
In wireless communication standard, use the situation of 3 transmitting antennas usually in addition, the embodiment of the invention also reaches the scheme of best interference diversity effect accordingly for this situation design.
To use 3 situation in 4 antennas to be example, each symbol of 3 data flow a, b, c recycles each the scheme in selecteed 3 antennas, its schematic diagram is as follows, at this, still tentation data flows a, b, c is detected according to the sequencing of a, b, c at receiving terminal, and hypothesis antenna 3 does not have 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.
The embodiment of the invention provides 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 such scheme is as follows, and among the figure, 6 kinds of all arrangements all are listed:
In such scheme, employed number of permutations is less, so can no longer further reduce.In addition, analysis also shows, for the situation of using 3 transmitting antennas, can not use the situation of 4 transmitting antennas such for another example, reduces the number of the arrangement of required use.
For the situation of using 3 transmitting antennas, the symbol period that comprises in 1 TTI is counted y when not being 6 integral multiple, consider 6 kinds of above-mentioned arrangements of traversal repeatedly up to the symbol period number of remainder less than 6 situation.
At this moment, we are the symbol period number scale of remainder x, x be y divided by 6 remainders that obtain, inevitable less than 6.Hereinafter be given in the scheme that traversal is arranged in x the remaining symbol period, this scheme can reach optimum effect.
This scheme need satisfy, and in this x symbol period, the x kind that is experienced is arranged, and must be different x kind in 6 kinds of above-mentioned arrangements of traversal.
X more than or equal to 3 situation under, at a described x symbol period, 3 arrangements of per 3 symbol periods traversal also need to satisfy such principle: in these 3 arrangements, each data flow has all traveled through 3 all transmitting antennas, and promptly each data flow each employed transmitting antenna in these 3 arrangements all has nothing in common with each other.
6 kinds of above-mentioned arrangements can be divided into two groups,
Find out that easily in 3 arrangements that every group is all satisfied in this group, each data flow has all traveled through 3 all transmitting antennas, promptly each data flow each employed transmitting antenna in these 3 arrangements all has nothing in common with each other.
X more than or equal to 3 situation under, any one group of 3 arrangement that comprised for example organize two in above-mentioned group one of 3 symbol periods traversal and group two, again at last (x-3) individual symbol period, in one group of 3 arrangement that comprised of traversal except a group (for example organizing two) that has traveled through arbitrarily (x-3) individual.
X less than 3 situation under, at x symbol period, travel through in above-mentioned group one and the group two in any one group of 3 arrangement that comprised x arbitrarily.
Identical with the principle of the optimal case of the situation of 4 streams of emission noted earlier, in order to reach better diversity, under the situation of 3 streams of emission, in all 6 kinds of arrangements processes repeatedly of traversal, when traveling through each time, 6 kinds of arrangements that comprised are traveled through according to random order, but satisfy in 3 arrangements being experienced each in 3 continuous symbol periods, the principle that the employed transmitting antenna of each data flow all has nothing in common with each other.Concrete execution mode is exactly, 6 kinds of all arrangements of each traversal, all be the 3 kinds of any one group arrangements that travel through earlier in two groups, travel through 3 kinds of arrangements of one group of two remainder in the group again, such as twice 6 kinds of all arrangement of traversal, can carry out according to the mode of group one, group two, group one, group two.The order of each arrangement can be any in the group because between two groups in two arrangements in adjacent-symbol cycle, all must have and only have the data flow of sending out identical on the transmitting antenna, can not avoid by the adjustment that puts in order in organizing.
Above-mentionedly be meant in certain adjacent 3 symbol period of time-domain or frequency domain (promptly not to be 3 symbol periods arbitrarily at 3 symbol periods, but 3 adjacent symbol periods), the transmitting antenna that each data flow is used has nothing in common with each other, corresponding concrete processing procedure can comprise: in a TTI, begin in 3 adjacent symbol periods of the time-domain that experienced or frequency domain from certain symbol period, the transmitting antenna that each data flow is used has nothing in common with each other; From with above-mentioned 3 symbol periods at least one in 3 adjacent symbol periods of time-domain that the adjacent some symbol periods of time-domain or frequency domain begin to be experienced or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other; So many groups time-domain or 3 adjacent symbol periods of frequency domain of experience all satisfy above-mentioned condition successively, and remaining symbol period number is less than 3 in a described TTI.
The thought of the interference diversity that the embodiment of the invention is described 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.The application of the embodiment of the invention is described at this situation 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.(each transmitting antenna is shown in each tabulation the attention figure from following schematic diagram, and each symbol period of each line display) preceding 4 the row as can be seen, when the symbol of b is launched by antenna 1, emission travels through all possible combination (get 3 from 4 antennas of remainder, 4 kinds of combinations are arranged) to employed 3 antennas of symbol that it 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 matrix schematic diagrames 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 matrix 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, is employed 3 antennas in the schematic diagram of the scheme that data flow c is reached best interference diversity effect that 3 kinds of situations of combination of antennas 1,2,3 are inserted fully, and 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 in 3 kinds of situations of combination of antennas 1,2,32 kinds, as figure below (the matrix schematic diagram 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 remainder 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 (matrix schematic diagram 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 matrix schematic diagram a, matrix schematic diagram b, matrix schematic diagram a, promptly the mode according to matrix schematic diagram a, matrix schematic diagram b, matrix schematic diagram a, matrix schematic diagram a, matrix schematic diagram b, matrix schematic diagram 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 accordingly 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 that the embodiment of the invention is at the employed preferred embodiment of 5 transmitting antenna MIMO systems.Certainly, travel through the purpose that 120 kinds of all different arrangements also can realize the embodiment of the invention, can constitute suboptimum embodiment of the present invention, but its complexity is greater than the preferred embodiment of the present invention of 60 kinds of arrangements of traversal.
As previously mentioned, we have provided a packet and have used 8 continuous OFDM symbols on the time domain, and each OFDM symbol takies in the communication plan of 16 continuous on frequency domain subcarriers, the option b of the embodiment of the invention and the preferred embodiment of option A.These preferred embodiments mainly are to satisfy in 4 arrangements being experienced in 4 continuous on frequency domain symbol periods each, the principle that the employed transmitting antenna of each data flow all has nothing in common with each other.These preferred embodiments also satisfy used two arrangements in the cycle of adjacent symbol on two frequency domains between two adjacent groups, each data flow principle that employed separately transmitting antenna all has nothing in common with each other in these two arrangements, notice that this just is equivalent to satisfy used two arrangements in the cycle of on any two frequency domains adjacent symbol, each data flow principle that employed separately transmitting antenna all has nothing in common with each other in these two arrangements, because the principle that each data flow each employed transmitting antenna in these two arrangements all has nothing in common with each other has been satisfied in 4 arrangements that group is interior.Can find another kind of preferred embodiment, except satisfying above-mentioned condition, also satisfy the principle that the employed transmitting antenna of each data flow in 4 arrangements being experienced in 4 continuous on time domain symbol periods all has nothing in common with each other as far as possible, and on any two time domains the adjacent symbol principle that each data flow each the employed transmitting antenna in these two arrangements in used two arrangements all has nothing in common with each other in the cycle.The design process and the result of described another kind of preferred embodiment introduce below.
At first consider the another kind of preferred embodiment of option b.As mentioned before, traversal reaches 12 kinds of arrangements of optimum interference diversity effect, is the order according to each arrangement shown in figure below, travels through in 12 continuous symbol periods.Promptly according to the order in figure below, in one section continuous symbol period according to group one, group two with organize 12 arrangements of sequencing traversal of three, and in the continuous symbol period of next section again according to group one, group two with organize 12 arrangements of sequencing traversal of three.
Specifically can adopt " group m-n ", n arrangement among the expression group m.If the embodiment shown in employing figure below just can satisfy in 4 arrangements being experienced in 4 continuous on time domain symbol periods each, the principle that the employed transmitting antenna of each data flow all has nothing in common with each other as far as possible.
Group m-among the last figure?, use group m is determined in expression, but is to use which arrangement in the group m, also needs to optimize.From the graph as can be seen, in the piece that 4 continuous sub-carriers showing at 6 use square frames " " circles and 4 continuous OFDM symbols are formed, all satisfy in 4 arrangements being experienced in 4 continuous on all time domains symbol periods each, the principle that the employed transmitting antenna of each data flow all has nothing in common with each other, also satisfy in 4 arrangements being experienced in previous described 4 symbol periods continuous on all frequency domains each, the principle that the employed transmitting antenna of each data flow all has nothing in common with each other simultaneously.For example, in the piece of the 1st to the 4th subcarrier and the 1st to the 4th OFDM symbol composition, 4 symbol periods in any delegation of this matrix-block of 4 * 4 are 4 continuous on time domain symbol periods, and are 4 continuous on frequency domain symbol periods at 4 symbol periods of any row of this matrix-block of 4 * 4.See easily, all satisfy the principle that the employed transmitting antenna of each data flow all has nothing in common with each other in 4 arrangements in 4 symbol periods of each row of matrix-block, being experienced, all satisfy the principle that the employed transmitting antenna of each data flow all has nothing in common with each other in 4 arrangements in 4 symbol periods of each row of matrix-block, being experienced simultaneously.In this embodiment, in 4 kinds of arrangements that repeatedly travel through each group each time, the relative order of these 4 kinds of arrangements slightly changes, yet the increase of this complexity of bringing is very little.
In the above-described embodiments, with identical in a kind of preferred embodiment of previous option b, group 1-4 is adjacent at frequency domain with the symbol period at group 2-1 place, and group 2-4 is adjacent at frequency domain with the symbol period at group 3-1 place.In addition, the symbol period that following these are arranged places is also adjacent, organizes promptly that 1-1 is adjacent with group 2-2, group 1-2 is adjacent with group 2-3, group 1-3 is adjacent with group 2-4, group 2-1 is adjacent with group 3-2, group 2-2 is adjacent with group 3-3, group 2-3 is adjacent with group 3-4.Can adjust the relative order of each arrangement in each group, make, all satisfy the principle that the employed transmitting antenna of each data flow all has nothing in common with each other in each above-mentioned adjacent-symbol arrangement in the cycle.
The result of the relative order of each arrangement is as follows in adjusted each group:
After this optimization group m-? every concrete use group m in which arrangement.The principle of foundation is, the employed transmitting antenna of each data flow in 4 arrangements that guarantee earlier to be experienced in 4 continuous symbol periods on the frequency domain all has nothing in common with each other, and the employed transmitting antenna of each data flow in each adjacent-symbol arrangement in the cycle all has nothing in common with each other on the frequency domain; Secondly, the employed transmitting antenna of each data flow in 4 arrangements that as far as possible guarantee to be experienced in 4 continuous symbol periods on the time domain all has nothing in common with each other, and the employed transmitting antenna of each data flow in each adjacent-symbol arrangement in the cycle all has nothing in common with each other on the time domain.An embodiment according to the mentioned above principle design is as follows:
Secondly, the another kind of preferred embodiment of design A again.We are with " I organize m-n ", and n arrangement among expression group one the group m used " II organizes m-n ", represent n arrangement among crowds two the group m.If the embodiment shown in employing figure below just can satisfy the principle that the employed transmitting antenna of each data flow in 4 arrangements being experienced in 4 continuous on time domain symbol periods all has nothing in common with each other as far as possible.
As previously mentioned, can adjust group one the relative order of respectively organizing each interior arrangement, make and all satisfy the principle that the employed transmitting antenna of each data flow all has nothing in common with each other in each arrangement of adjacent-symbol in the cycle.The result of the relative order of adjustment back group one interior each arrangement of each group is as follows:
Also can use the same method, adjust group two the relative order of respectively organizing each interior arrangement, make, all satisfy the principle that the employed transmitting antenna of each data flow all has nothing in common with each other in each arrangement of adjacent-symbol in the cycle.Here just do not give unnecessary details corresponding results.
Adopt same principle, the employed transmitting antenna of each data flow in 4 arrangements that can also guarantee earlier to be experienced in 4 continuous symbol periods on the time domain all has nothing in common with each other, and the employed transmitting antenna of each data flow in each adjacent-symbol arrangement in the cycle all has nothing in common with each other on the time domain; Secondly, the employed transmitting antenna of each data flow in 4 arrangements that as far as possible guarantee to be experienced in 4 continuous symbol periods on the frequency domain all has nothing in common with each other, and the employed transmitting antenna of each data flow in each adjacent-symbol arrangement in the cycle all has nothing in common with each other on the frequency domain.According to above principle, can also design the preferred embodiment of other kind of the option b of the embodiment of the invention and option A, just do not give unnecessary details corresponding results here.
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 the method for the embodiment of the invention, to reach whole best interference diversity effect.
Need to prove, in all matrix schematic diagrames that above-mentioned each embodiment of the invention provides, the order of each row of corresponding matrix can satisfy exchange arbitrarily under the condition of corresponding principle, and the order of each row of matrix also can satisfy exchange arbitrarily under the condition of corresponding principle, and its effect of the new departure that obtains is still identical.This be because, in the embodiments of the invention, each tabulation of matrix is shown each symbol period in the TTI and each transmitting antenna of each line display of matrix, perhaps each symbol period in TTI of each line display of matrix and each transmitting antenna is shown in each tabulation of matrix, so each row of matrix or the order of each row, the i.e. order of each symbol period in TTI or the order of each transmitting antenna are can exchange arbitrarily and the effect that reaches is identical.
At the situation of mimo system 4 system of transmit antennas, 4 kinds of arrangements of scheme second traversal of the prior art; And 12 kinds of arrangements of the scheme of embodiment of the invention traversal; Perhaps travel through 24 kinds of arrangements.
When the signal of the second layer of scheme second of the prior art 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 embodiment of the invention travels through all possible combination, or has experienced two kinds of combinations at least.
The contrast of the probability distribution graph of the instantaneous channel capacity of the scheme of the scheme second of the prior art and the embodiment of the invention, simulation result figure as shown in Figure 4.Adopt the mimo system of the embodiment of the invention, the probability distribution of instantaneous channel capacity is more concentrated than scheme second of the prior art.
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 scheme of the embodiment of the invention of Huawei Cycling.Data analysis shows, the variance of instantaneous channel capacity under the scheme of the embodiment of the invention, little by 9% than the variance of instantaneous channel capacity under the scheme second.
The embodiment of the invention also provides a kind of many code words of MIMO communication system, and its specific implementation structure can comprise following part as shown in Figure 5 and Figure 6:
(1) transmitting terminal, comprise 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, at each symbol period of a Transmission Time Interval TTI, each emission of K transmitting antenna is used at least one road in the K circuit-switched data stream in turn; And, thereby be launched the combination of employed one or more antennas for the symbol that can't form one or more data flow of disturbing at receiving terminal by the symbol that the interference cancellation techniques elimination is still flowed a certain circuit-switched data, change at least once along with different symbol periods, to realize interference diversity;
Can also comprise the channel coding schemes determining unit at this transmitting terminal, be used to receive K CQI by the receiving terminal feedback, and, determine modulation and the channel coding schemes MCS of each road of the K circuit-switched data stream that corresponding transmitting terminal is launched in current TTI according to received K CQI value; This channel coding schemes determining unit specifically can comprise:
Judging unit is used for judging whether K received CQI value exists at least one unreliable;
First determining unit, be used for when described judging unit determines to exist at least one unreliable, determine that according to the CQI value that transmitting terminal receives at before one or several TTI the corresponding at least one circuit-switched data of described at least one insecure CQI value flows the MCS in current TTI, perhaps, determine the MCS of described at least one circuit-switched data stream according to described at least one circuit-switched data stream at the MCS of before one or several TTI in current TTI;
Second determining unit is used for when described judging unit is determined not exist at least one unreliable, and then the CQI value that receives according to the current TTI of transmitting terminal is determined current MCS.
Described transmitting terminal specifically comprises:
Interfering data stream determining unit, be used in each symbol period of the symbol of any a certain circuit-switched data stream of determining in by an emission K circuit-switched data stream of determining arbitrarily of K transmitting antenna, determine that after receiving terminal adopts interference excision detection technology to eliminate the interference of symbol of one or more detected data flow it disturbs and is not received that end is eliminated by interference cancellation techniques and the symbol that still symbol of described a certain circuit-switched data stream formed one or more data flow of disturbing;
Emission controlling unit, be used for the symbol that the described symbol that still described a certain circuit-switched data is flowed that described interfering data stream determining unit is determined forms one or more data flow of disturbing is launched the combination of employed one or more transmitting antennas, in a described TTI along with different symbol period changes at least once, to realize interference diversity.
At transmitting terminal, for realizing optimum interference diversity, corresponding emission controlling unit specifically can comprise with lower unit:
The combination acquiring unit, all possible combination that is used to obtain a plurality of transmitting antennas;
Control unit, be used to travel through all possible combination that the combination acquiring unit obtains, launch the described symbol that still symbol of described a certain circuit-switched data stream is formed one or more data flow of disturbing, and the number of times that each combination is used is identical as far as possible, to realize optimum interference diversity.
In this system embodiment, according to number of transmit antennas purpose difference (being the difference of K value), the control corresponding unit will adopt different schemes to realize, will be example with K=4 and K=3 below, and described control unit is specifically described:
(1) as shown in Figure 5, when K=4, described control unit can comprise:
First control unit is used in each symbol period of a TTI, ergodic data stream D1, D2, D4 and antenna 1,2 ... all possible 24 kinds of arrangements of 4 corresponding relations repeatedly, count x less than 24 up to the symbol period of remainder, promptly be not enough to ergodic data stream D1, D2 ... D4 and antenna 1,2 ... all possible 24 kinds of arrangements of 4 corresponding relations once.
Alternatively, this control unit can also comprise second control unit, is used for each arrangement of traveling through in less than 24 x symbol period described, if x is more than or equal to 12, then the traversal can reach 12 kinds of arrangements of optimum interference diversity effect once, then the value of x reduce 12 so that x less than 12; In less than 12 x symbol period, traversal can reach the arrangement that the x kind in 12 kinds of arrangements of optimum interference diversity effect has nothing in common with each other; If x more than or equal to 8, then travel through satisfy specified conditions in described 12 kinds of arrangements 4 kinds of arrangements once, using described these 4 kinds when arranging the emission data, satisfy the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 4 so that x less than 8; If x more than or equal to 4, then travel through satisfy specified conditions in described 12 kinds of arrangements 4 kinds of arrangements once, using described these 4 kinds when arranging the emission data, satisfy the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 4 so that x less than 4; In less than 4 x symbol period, travel through the x kind and arrange, when using described this x kind to arrange emission data, the transmitting antenna that satisfies each data flow use has nothing in common with each other.
(2) as shown in Figure 6, when K=3, described control unit can comprise:
The 3rd control unit is used in each symbol period of a TTI, ergodic data stream D1, D2, D3 and antenna 1,2 ... all possible 6 kinds of arrangements of 3 corresponding relations repeatedly, count x less than 6 up to the symbol period of remainder, promptly be not enough to ergodic data stream D1, D2 ... D3 and antenna 1,2 ... all possible 6 kinds of arrangements of 3 corresponding relations once.
Alternatively, described control unit can also comprise the 4th control unit, and each that is used for traveling through in less than 6 x symbol period described arranged, and it is the x kind that has nothing in common with each other in all possible 6 kinds of arrangements that the x kind that is traveled through is arranged; If x is more than or equal to 3, then travel through in all possible 6 kinds of arrangements 3 kinds of arrangements satisfying specified conditions once, using described these 3 kinds when arranging the emission data, satisfying the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 3 so that x less than 3; In less than 3 x symbol period, travel through the x kind and arrange, when using described this x kind to arrange emission data, the transmitting antenna that satisfies each data flow use has nothing in common with each other.
(2) receiving terminal, described mimo system receiving terminal adopt interference excision detection technology to receive.
Can comprise the feedback information unit at this receiving terminal, be used for information to K channel quality indicator (CQI) of described transmitting terminal feedback, a described K CQI is corresponding one by one with described K circuit-switched data stream, transmitting terminal is used to indicate the channel quality of each road of described K circuit-switched data stream, so that can be determined the MCS of each TTI correspondence according to corresponding C QI at the channel that current TTI experienced.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the 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 (31)
1. a MIMO multi-code communication method that is used for mimo system is characterized in that, comprising:
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 Transmission Time Interval 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
At transmitting terminal, thereby disturb for it and not to be received end and to eliminate still the combination that symbol that symbol to a certain circuit-switched data stream forms one or more data flow of disturbing is launched employed one or more antennas by interference cancellation techniques, change at least once along with different symbol periods, to realize interference diversity.
2. MIMO multi-code communication method according to claim 1 is characterized in that, this method also comprises:
The information of K channel quality indicator (CQI) of receiving terminal feedback is given transmitting terminal, and a described K CQI is corresponding one by one with described K circuit-switched data stream, is used to indicate the channel quality of each road of described K circuit-switched data stream at the channel that current TTI experienced.
3. MIMO multi-code communication method according to claim 2 is characterized in that, this method also comprises:
Transmitting terminal receives K CQI by the receiving terminal feedback, and according to received K CQI value, determines modulation and the channel coding schemes MCS of each road of the K circuit-switched data stream that corresponding transmitting terminal is launched in current TTI.
4. MIMO multi-code communication method according to claim 2 is characterized in that, after transmitting terminal received K the CQI that is fed back by receiving terminal, this method also comprised:
If judge that in K the received CQI value at least one is unreliable, then the CQI value that receives at before one or several TTI according to transmitting terminal of transmitting terminal determines that the corresponding at least one circuit-switched data of described at least one insecure CQI value flows the MCS in current TTI, perhaps, determine the MCS of described at least one circuit-switched data stream according to described at least one circuit-switched data stream at the MCS of before one or several TTI in current TTI.
5. MIMO multi-code communication method according to claim 5, it is characterized in that, judge that in K the received CQI value at least one is unreliable, be meant that transmitting terminal judges that at least one the signal to noise ratio in K the received CQI value is lower than a given threshold values.
6. according to each described MIMO multi-code communication method of claim 1 to 5, 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 a certain circuit-switched data stream of in by the emission K circuit-switched data stream of determining arbitrarily in K the transmitting antenna, determining arbitrarily, after receiving terminal adopts interference excision detection technology to eliminate the interference of symbol of one or more detected data flow, thereby it disturbs and not to be received end and to eliminate still the combination that symbol that symbol to described a certain circuit-switched data stream forms one or more data flow of disturbing is launched employed one or more transmitting antennas by interference cancellation techniques, in a described TTI along with different symbol period changes at least once, to realize interference diversity.
7. MIMO multi-code communication method according to claim 6 is characterized in that, described each symbol period at a TTI, 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 the emission K circuit-switched data stream of in by K transmitting antenna, determining arbitrarily, thereby it disturbs and not to be received end and to eliminate 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 transmitting antennas by interference cancellation techniques, 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.
8. MIMO multi-code communication method according to claim 7 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.
9. MIMO multi-code communication method according to claim 8 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.
10. MIMO multi-code communication method according to claim 8 is characterized in that, the method for the optimum interference diversity of described realization also comprises:
In each symbol period in a TTI, use the number of times of each arrangement equal as far as possible.
11. MIMO multi-code communication method according to claim 7 is characterized in that, the method for the described optimum interference diversity of described realization comprises:
In a TTI, ergodic data stream D1, D2 ... Dk and antenna 1,2 ... the k corresponding relation the part in might arranging arrange.
12. MIMO multi-code communication method according to claim 11 is characterized in that, K=5, traversal be arranged as 60 kinds; K=4, traversal be arranged as 12 kinds.
13. MIMO multi-code communication method according to claim 11 is characterized in that, the method for the optimum interference diversity of described realization also comprises:
In each symbol period in a TTI, use the number of times of each arrangement that is traveled through equal as far as possible.
14. MIMO multi-code communication method according to claim 7 is characterized in that, when K=4, the method for the optimum interference diversity of described realization comprises:
In each symbol period of a TTI, ergodic data stream D1, D2 ... D4 and antenna 1,2, all possible 24 kinds of arrangements of 4 corresponding relations are repeatedly counted x less than 24 up to the symbol period of remainder, promptly are not enough to ergodic data stream D1, D2, D4 and antenna 1,2 ... all possible 24 kinds of arrangements of 4 corresponding relations once.
15. MIMO multi-code communication method according to claim 14 is characterized in that, each that travels through in less than 24 x symbol period described arranged, and satisfies following feature:
If x is more than or equal to 12, then traversal can reach 12 kinds of arrangements of optimum interference diversity effect once, then the value of x reduce 12 so that x less than 12;
In less than 12 x symbol period, traversal can reach the arrangement that the x kind in 12 kinds of arrangements of optimum interference diversity effect has nothing in common with each other;
If x more than or equal to 8, then travel through satisfy specified conditions in described 12 kinds of arrangements 4 kinds of arrangements once, using described these 4 kinds when arranging the emission data, satisfy the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 4 so that x less than 8;
If x more than or equal to 4, then travel through satisfy specified conditions in described 12 kinds of arrangements 4 kinds of arrangements once, using described these 4 kinds when arranging the emission data, satisfy the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 4 so that x less than 4;
In less than 4 x symbol period, travel through the x kind and arrange, when using described this x kind to arrange emission data, the transmitting antenna that satisfies each data flow use has nothing in common with each other.
16. MIMO multi-code communication method according to claim 14 is characterized in that, in some 4 adjacent symbol period of time-domain or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other.
17. MIMO multi-code communication method according to claim 16 is characterized in that, and is described in some 4 adjacent symbol period of time-domain or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other, and specifically comprises:
In a TTI, begin in 4 adjacent symbol periods of the time-domain that experienced or frequency domain from certain symbol period, the transmitting antenna that each data flow is used has nothing in common with each other;
From with above-mentioned 4 symbol periods at least one in 4 adjacent symbol periods of time-domain that the adjacent some symbol periods of time-domain or frequency domain begin to be experienced or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other;
So many groups time-domain or 4 adjacent symbol periods of frequency domain of experience all satisfy above-mentioned condition successively, and remaining symbol period number is less than 4 in a described TTI.
18. MIMO multi-code communication method according to claim 14 is characterized in that, in all 2 adjacent symbol periods of time-domain or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other.
19. MIMO multi-code communication method according to claim 7 is characterized in that, when K=3, the method for the optimum interference diversity of described realization comprises:
In each symbol period of a TTI, ergodic data stream D1, D2 ... D3 and antenna 1,2, all possible 6 kinds of arrangements of 3 corresponding relations are repeatedly counted x less than 6 up to the symbol period of remainder, promptly are not enough to ergodic data stream D1, D2, D3 and antenna 1,2 ... all possible 6 kinds of arrangements of 3 corresponding relations once.
20. MIMO multi-code communication method according to claim 19 is characterized in that, each that travels through in less than 6 x symbol period described arranged, and satisfies following feature:
The x kind arrangement that is traveled through is the x kind that has nothing in common with each other in all possible 6 kinds of arrangements;
If x is more than or equal to 3, then travel through in all possible 6 kinds of arrangements 3 kinds of arrangements satisfying specified conditions once, using described these 3 kinds when arranging the emission data, satisfying the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 3 so that x less than 3;
In less than 3 x symbol period, travel through the x kind and arrange, when using described this x kind to arrange emission data, the transmitting antenna that satisfies each data flow use has nothing in common with each other.
21. MIMO multi-code communication method according to claim 19 is characterized in that, in some 3 adjacent symbol period of time-domain or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other.
22. MIMO multi-code communication method according to claim 21 is characterized in that, and is described in some 3 adjacent symbol period of time-domain or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other, and specifically comprises:
In a TTI, begin in 3 adjacent symbol periods of the time-domain that experienced or frequency domain from certain symbol period, the transmitting antenna that each data flow is used has nothing in common with each other;
From with above-mentioned 3 symbol periods at least one in 3 adjacent symbol periods of time-domain that the adjacent some symbol periods of time-domain or frequency domain begin to be experienced or frequency domain, the transmitting antenna that each data flow is used has nothing in common with each other;
So many groups time-domain or 3 adjacent symbol periods of frequency domain of experience all satisfy above-mentioned condition successively, and remaining symbol period number is less than 3 in a described TTI.
23. many code words of MIMO communication system is characterized in that, comprising:
Transmitting terminal, comprise 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, at each symbol period of a Transmission Time Interval TTI, each emission of K transmitting antenna is used at least one road in the K circuit-switched data stream in turn; And, thereby be launched the combination of employed one or more antennas for the symbol that can't form one or more data flow of disturbing at receiving terminal by the symbol that the interference cancellation techniques elimination is still flowed a certain circuit-switched data, change at least once along with different symbol periods, to realize interference diversity;
Receiving terminal, described mimo system receiving terminal adopt interference excision detection technology to receive.
24. system according to claim 23, it is characterized in that, described receiving terminal also comprises the feedback information unit, be used for information to K channel quality indicator (CQI) of described transmitting terminal feedback, a described K CQI is corresponding one by one with described K circuit-switched data stream, is used to indicate the channel quality of each road of described K circuit-switched data stream at the channel that current TTI experienced; Described transmitting terminal also comprises the channel coding schemes determining unit, be used to receive K CQI by the receiving terminal feedback, and, determine modulation and the channel coding schemes MCS of each road of the K circuit-switched data stream that corresponding transmitting terminal is launched in current TTI according to received K CQI value.
25. system according to claim 24 is characterized in that, described channel coding schemes determining unit comprises:
Judging unit is used for judging whether K received CQI value exists at least one unreliable;
First determining unit, be used for when described judging unit determines to exist at least one unreliable, determine that according to the CQI value that transmitting terminal receives at before one or several TTI the corresponding at least one circuit-switched data of described at least one insecure CQI value flows the MCS in current TTI, perhaps, determine the MCS of described at least one circuit-switched data stream according to described at least one circuit-switched data stream at the MCS of before one or several TTI in current TTI;
Second determining unit is used for when described judging unit is determined not exist at least one unreliable, and then the CQI value that receives according to the current TTI of transmitting terminal is determined current MCS.
26., it is characterized in that described transmitting terminal specifically comprises according to claim 23,24 or 25 described systems:
Interfering data stream determining unit, be used in each symbol period of the symbol of any a certain circuit-switched data stream of determining in by an emission K circuit-switched data stream of determining arbitrarily of K transmitting antenna, determine that after receiving terminal adopts interference excision detection technology to eliminate the interference of symbol of one or more detected data flow it disturbs and is not received that end is eliminated by interference cancellation techniques and the symbol that still symbol of described a certain circuit-switched data stream formed one or more data flow of disturbing;
Emission controlling unit, be used for the symbol that the described symbol that still described a certain circuit-switched data is flowed that described interfering data stream determining unit is determined forms one or more data flow of disturbing is launched the combination of employed one or more transmitting antennas, in a described TTI along with different symbol period changes at least once, to realize interference diversity.
27. system according to claim 26 is characterized in that, described emission controlling unit comprises:
The combination acquiring unit, all possible combination that is used to obtain a plurality of transmitting antennas;
Control unit, be used to travel through all possible combination that the combination acquiring unit obtains, launch the described symbol that still symbol of described a certain circuit-switched data stream is formed one or more data flow of disturbing, and the number of times that each combination is used is identical as far as possible, to realize optimum interference diversity.
28. system according to claim 27 is characterized in that, when K=4, described control unit comprises:
First control unit is used in each symbol period of a TTI, ergodic data stream D1, D2, D4 and antenna 1,2 ... all possible 24 kinds of arrangements of 4 corresponding relations repeatedly, count x less than 24 up to the symbol period of remainder, promptly be not enough to ergodic data stream D1, D2 ... D4 and antenna 1,2 ... all possible 24 kinds of arrangements of 4 corresponding relations once.
29. system according to claim 28 is characterized in that, described control unit also comprises:
Second control unit is used for each arrangement of traveling through in less than 24 x symbol period described, if x more than or equal to 12, then traversal can reach 12 kinds of arrangements of optimum interference diversity effect once, then the value of x reduce 12 so that x less than 12; In less than 12 x symbol period, traversal can reach the arrangement that the x kind in 12 kinds of arrangements of optimum interference diversity effect has nothing in common with each other; If x more than or equal to 8, then travel through satisfy specified conditions in described 12 kinds of arrangements 4 kinds of arrangements once, using described these 4 kinds when arranging the emission data, satisfy the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 4 so that x less than 8; If x more than or equal to 4, then travel through satisfy specified conditions in described 12 kinds of arrangements 4 kinds of arrangements once, using described these 4 kinds when arranging the emission data, satisfy the big line of emission that each data flow uses and have nothing in common with each other, then the value of x reduce 4 so that x less than 4; In less than 4 x symbol period, travel through the x kind and arrange, when using described this x kind to arrange emission data, the transmitting antenna that satisfies each data flow use has nothing in common with each other.
30. system according to claim 27 is characterized in that, when K=3, described control unit comprises:
The 3rd control unit is used in each symbol period of a TTI, ergodic data stream D1, D2, D3 and antenna 1,2 ... all possible 6 kinds of arrangements of 3 corresponding relations repeatedly, count x less than 6 up to the symbol period of remainder, promptly be not enough to ergodic data stream D1, D2 ... D3 and antenna 1,2 ... all possible 6 kinds of arrangements of 3 corresponding relations once.
31. system according to claim 30 is characterized in that, described control unit also comprises:
The 4th control unit, each that is used for traveling through in less than 6 x symbol period described arranged, and it is the x kind that has nothing in common with each other in all possible 6 kinds of arrangements that the x kind that is traveled through is arranged; If x is more than or equal to 3, then travel through in all possible 6 kinds of arrangements 3 kinds of arrangements satisfying specified conditions once, using described these 3 kinds when arranging the emission data, satisfying the transmitting antenna that each data flow uses and have nothing in common with each other, then the value of x reduce 3 so that x less than 3; In less than 3 x symbol period, travel through the x kind and arrange, when using described this x kind to arrange emission data, the transmitting antenna that satisfies each data flow use has nothing in common with each other.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101959858A CN101222258B (en) | 2007-01-09 | 2007-12-14 | MIMO multi-code communication method, device and system |
| PCT/CN2008/070041 WO2008083619A1 (en) | 2007-01-09 | 2008-01-08 | A communication method for mimo multiple code words |
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| CNA2007100006101A CN101114890A (en) | 2007-01-09 | 2007-01-09 | MIMO multi-code communication method |
| CN200710000610.1 | 2007-01-09 | ||
| CN200710072976.X | 2007-01-16 | ||
| CN2007101959858A CN101222258B (en) | 2007-01-09 | 2007-12-14 | MIMO multi-code communication method, device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255702A (en) * | 2010-05-17 | 2011-11-23 | 电信科学技术研究院 | MIMO (Multiple Input Multiple Output) mode switching method and device |
| CN112671510A (en) * | 2020-12-21 | 2021-04-16 | 海能达通信股份有限公司 | Channel quality indication feedback method, adaptive modulation coding method and device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US8687731B2 (en) * | 2009-02-02 | 2014-04-01 | Qualcomm Incorporated | Uplink open-loop spatial multiplexing in wireless communications |
| CN104883237B (en) | 2014-02-28 | 2018-03-09 | 中兴通讯股份有限公司 | A kind of data transmission method, apparatus and system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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2007
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255702A (en) * | 2010-05-17 | 2011-11-23 | 电信科学技术研究院 | MIMO (Multiple Input Multiple Output) mode switching method and device |
| 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 |
| CN112671510A (en) * | 2020-12-21 | 2021-04-16 | 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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| CN101222258B (en) | 2010-05-12 |
| CN101114890A (en) | 2008-01-30 |
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