CN105227226B - The multi-user reception method of force zero and serial interference elimination based on interference synthesis - Google Patents

The multi-user reception method of force zero and serial interference elimination based on interference synthesis Download PDF

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CN105227226B
CN105227226B CN201510523532.8A CN201510523532A CN105227226B CN 105227226 B CN105227226 B CN 105227226B CN 201510523532 A CN201510523532 A CN 201510523532A CN 105227226 B CN105227226 B CN 105227226B
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signal
interference
receiver
synthesis
transmitter
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CN105227226A (en
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李钊
戴晓琴
丁汉清
肖丽媛
赵林靖
刘勤
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CERTUSNET CORP
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/0328—Arrangements for operating in conjunction with other apparatus with interference cancellation circuitry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03299—Arrangements for operating in conjunction with other apparatus with noise-whitening circuitry

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Radio Transmission System (AREA)

Abstract

The present invention discloses a kind of multi-user reception method based on the force zero and serial interference elimination of interfering synthesis, including multiple transmitters and a public-address receiver, receiver obtains the modulation system information channel state information and transmitter use between each transmitter, receiving end signal number is down to by reception antenna number using interference synthesis first, then zero-forcing detector filtering matrix is calculated according to different signal synthesis situations, and mixed signal is filtered respectively, by being compared to filtering performance, judgement receives symbol, the influence for having solved code sign and having been received to mixed signal residual components is eliminated using method for eliminating serial interference, then remaining mixed signal is repeated to use cumulative interference, calculate filtering matrix, compare judgement, until restoring all to send symbol.The present invention is based on interference to synthesize, and using force zero and serial interference elimination, whole transmission symbols can be recovered in the case where reception antenna is less, improves the open ended number of users of system.

Description

The multi-user reception method of force zero and serial interference elimination based on interference synthesis
Technical field
The invention belongs in mobile communication technology field signal acceptance method more particularly to it is a kind of based on interference synthesis The multi-user reception method of force zero and serial interference elimination (Successive Interference Cancellation, SIC), Restore there are the scene of the multiple signals of co-channel interference for receiver, as multiple access accesses channel.
Background technology
With the development of mobile communication technology, the design of traditional time frequency signal has been difficult to meet people to pass Radio Link Defeated rate increasingly higher demands, people begin attempt to excavate communication opportunity from multiple dimensions, and spatial domain resource is therein one A importance.Multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) technology is wireless in recent years One disruptive technology of the communications field, it can realize the utilization of spatial domain resource.
With MIMO technology progress of research, point-to-point Single User MIMO systematic research is applied alone already close to saturation Family MIMO technology cannot be satisfied growing number of users demand, multiuser MIMO (Multiple-User MIMO, MU- MIMO it) receives more and more attention.In the research of current MU-MIMO, when solving signal number more than receiving terminal antenna number, The not enough degree of freedom interference-frees of receiving terminal receive all signals, such as zero-forcing detector method (Zero Forcing, ZF). Reception antenna number, which becomes, restricts an important factor for receiver receives ability, and limits the main aspect of power system capacity.
Interference alignment can be used for MU- with (Interference alignment cancellation, IAC) is eliminated The reception of multi-user data in mimo system.Li Z,Shen B,Li J D.Interference alignment and cancellation based concurrent transmission and scheduling scheme for multiuser CR-MIMO system.China Communications.2013,10(8):36-43 (multi-user MIMO systems Concurrent transmission and scheduling scheme are realized in middle combination interference alignment and elimination) in cognition MIMO (Cognitive Radio Multiple-Input Multiple-Output, CR-MIMO) a kind of transmitting and scheduling scheme based on IAC is devised in system, The dimension for receiving signal is reduced by using IA, and the influence of restored signal is eliminated using IC.This method can realize multichannel The reception of subsequent signal, but require cooperating for receiving terminal.
Can also realize the reception of multichannel data using adaptive-filtering, matched filtering (Matched filter, MF) with Output signal-to-noise ratio maximum turns to design object, is not limited by reception antenna number, can restore all transmitting symbols, but this method without Method eliminates interference, and when interfering stronger, Signal to Interference plus Noise Ratio deteriorates, and data transmission performance is deteriorated.
Since the accessible signal number of receiver is limited by reception antenna, dispatching algorithm also can be used to subsequent signal Number is constrained.Li Zhao, Liu Ruixue, Wang Lin wait priori formula user of the .MU-MIMO downlinks based on association interference to dispatch electricity Son and information journal, 2014,36 (1):67-73 selects one group to be communicated with base station from multiple users, realizes the communication resource Make full use of.But dispatching algorithm can hinder the information of unscheduled user to transmit, and not support burst communication.
In conclusion how to use the signal more than limited reception antenna recovery possibility, multi-user comm is promoted Transmission performance becomes urgent problem to be solved.
Invention content
Present invention aims at provide it is a kind of based on interference synthesis force zero and serial interference elimination multi-user reception method, It is intended to break through the constraint that traditional zero-forcing detector requirement reception antenna number is no less than signal component number to be solved, realization is connect using limited Signal more than receipts antenna recovery is possible, improves the open ended number of users of system.
Realize that the object of the invention method includes the following steps：
The first step, each transmitter configure NTRoot transmitting antenna, NT>=2, the radiation pattern for being all made of beam forming sends one Circuit-switched data, transmitter calculate precoding vector p according to respective channel informationk, obtain the modulation system letter per road transmission data Breath, and it is the maximum modulation system information of order of modulation in modulation system used to take L, K transmitter transmission signal number K, which is more than, to be connect Receipts machine antenna number NR, the transmission power of each transmitter is PT；
Second step, transmitter estimate channel state information hk, k=0,1, K-1, together with modulation system information L mono- It is same to be reported to receiver；
Third walks, and receiver receives mixed signal y,
Wherein, xkIndicate that the symbol that transmitter k is sent, n indicate that additive white Gaussian noise, the variance of noise component(s) are The space characteristics that the signal that transmitter k is sent is shown in receiving terminal are ek=hkpk, all signals of receiving terminal are constituted into set A, The signal number that then original state set A includes is K, i.e. card (A)=K, wherein card () indicate of element in set Number；
4th step compares card (A) and NRSize, if card (A)≤NR, receiver design zero-forcing detector filtering matrixμ ∈ card (A) are filtered y, whereinThe pseudoinverse of matrix, output are asked in expression Card (A) is a to have solved code sign；If card (A) ＞ NR, receiver randomly selects the N in set AR- 1 signal, which forms, waits for solution letter Number set C, then card (C)=NRThe space characteristics e of all signals in -1, set Ci=hipi, i ∈ C, by remaining letter in set A Number composition interference set I, the signal in set I is synthesized, the space characteristics of cumulative interference areIt sends There are a variety of situations after ovennodulation for symbol, so cumulative interference shares Lcard(I)Kind synthesis situation, it is assumed that modulation constellation has There is centre symmetry, then only needs to considerKind interference synthesis situation, i.e. eεHaveA probable value；
5th step, receiver is first by the space characteristics e of signal to be solvedi=hipi, the space characteristics of i ∈ C and cumulative interference eεSchimidt orthogonalization is carried out, one group of orthonormal basis is obtainedWithThen force zero is calculated according to orthonormal basis to connect Receive each filter vector f in filtering matrix Gi, i ∈ C,
By this NR- 1 column vector carries out conjugate transposition and obtains GH, it is based on eεDiversity, G is sharedKind, wherein It is only a kind of to be consistent with the symbol situation of actual transmission；
6th step, receiver, which first divides mixed signal y, isThen road uses the design of the 5th stepA filtering matrix GHEvery road mixed signal is filtered respectively, and compares the signal-to-noise ratio/Signal to Interference plus Noise Ratio for receiving signal SNR/SINR, preferentially judgement export NR- 1 reception symbol,
7th step, receiver will be mixed using the symbol and channel information reconstruction signal solved, then using serial interference elimination Close decoded N in signal yR- 1 symbolSignal corresponding to i ∈ CIt eliminates, reduces the letter of receiver processing Number number, obtains：
8th step, receiver delete decoded signal from set A, update set A by the way that set A-C is assigned to A, return It is back to FOUR EASY STEPS.
The further technical solution of the present invention is：When the antenna number difference of each transmitter configuration, each transmitter sends number According to mode it is different, as transmitting antenna number NTWhen=1, transmitter sends a circuit-switched data using theaomni-directional transmission mode, at this point, transmitting Antenna number is equal to the 1 corresponding h of transmitterkpkH should be replaced withk, the corresponding signal that sends of the transmitter is in the space of receiving terminal spy Sign becomes ek=hk；As transmitting antenna number NTWhen >=2, transmitter sends a circuit-switched data using beam forming transmission mode.
The present invention is compared with the prior art, and has following features：
1, traditional zero-forcing detector method requires reception antenna number to be no less than signal number to be solved, so working as signal number When more than reception antenna number, it can not be received by traditional zero-forcing detector method.The present invention can be realized in reception antenna All transmission datas are received in the case that number is limited, improve the open ended number of users of system, and the data rate obtained Performance；
2, the present invention devises interference synthetic method, is more than reception antenna number N sending symbol numbers KRIn the case of, choosing Take NR- 1 signal regards interference signal, and is synthesized, and the signal number of receiving terminal is reduced to NR, closed according to different signals Zero-forcing detector filtering matrix is calculated at situation, the zero-forcing detector filtering matrix of gained is used in combination to be filtered respectively to mixed signal, By being compared to filtering performance, judgement obtains correctly receiving symbol；
3, present invention employs successive interference cancellation techniques, by by the signal restored from the mixed signal received It subtracts, is born caused by receiver to reduce decoded signal, so that all transmitters is sent then in conjunction with zero-forcing detector Symbol be restored.
Description of the drawings
Fig. 1 is multi-user's ascending communication system model provided by the invention；
Fig. 2 is the multi-user reception method flow of the force zero based on interference synthesis and serial interference elimination provided by the invention Figure；
Fig. 3 is the multi-user reception method filtering of the force zero based on interference synthesis and serial interference elimination provided by the invention The design diagram of vector；
Fig. 4 is connecing for the multi-user reception method of the force zero based on interference synthesis and serial interference elimination provided by the invention Receipts machine structure chart；
Fig. 5 is that the embodiment of the present invention 1 is based on NT=2, NRThe system data rates performance simulation figure that=2 and K=3 is obtained, together When provide fixed reception antenna, change the system data rates analogous diagram of transmitter number (or subsequent signal number)；
Fig. 6 is that the embodiment of the present invention 2 is based on NT=1, NRThe system data rates performance simulation figure that=2 and K=3 is obtained.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, in conjunction with the accompanying drawings and embodiments to this hair It is bright to be described in further detail, it should be understood that described herein specific examples are only used to explain the present invention, and does not have to It is of the invention in limiting.
The embodiment of the present invention is based primarily upon multiple access access channel (Multiple Access Channel, MAC) and is studied A kind of explanation, it is desirable to provide multi-user reception method of force zero and serial interference elimination based on interference synthesis.
Embodiment 1
Fig. 1 is the system model of embodiment 1.In order to be easy to implement, only study by three transmitters and a reception unit At communication system, receiver configure NR=2 reception antennas, each transmitter configure NT=2 antennas, each transmitter A circuit-switched data is only sent, then the number K=3 of transmission data, the embodiment of the present invention only study all transmitters and be all made of binary system Phase-shift keying (PSK) modulates (Binary Phase-Shift Keying, BPSK), modulation system information L=2, it should be noted that this Invention is not limited to the case where all transmitters are all made of identical modulation system, when the modulation system that different transmitters use is different When, it is the maximum modulation system information of order of modulation in modulation system used to take L.
As shown in Fig. 2, the method for reseptance of the embodiment of the present invention 1 specifically comprises the following steps：
The first step, each transmitter configure NT=2 transmitting antennas, the radiation pattern for being all made of beam forming send one Circuit-switched data, transmitter calculate precoding vector p according to respective channel informationk, it is assumed that all transmitters are according to main character modules Formula is transmitted, then precoding vector is chosen for the main right singular vector of channel matrix, the maximum singular value pair with channel matrix It answers, per road, transmission is all made of BPSK modes and is modulated, and modulation system information is L=2, and the transmission power of each transmitter is equal It is PT；
Second step, transmitter estimate channel state information hk, k=0,1,2, it is reported together together with modulation system information L=2 To receiver；
Third walks, and receiver receives mixed signal y；
Wherein, xkIndicate that the symbol that transmitter k is sent, n indicate that additive white Gaussian noise, the variance of noise component(s) are The signal that transmitter k is sent is e in the space characteristics of receiving terminal shownk=hkpk, all signals of receiving terminal are constituted into set A, then the signal number that original state set A includes are 3, i.e. card (A)=3, wherein card () indicate element in set Number；
4th step compares the size of card (A) and reception antenna number 2, if card (A)≤2, receiver designs zero-forcing detector Filtering matrixμ ∈ card (A) are filtered y, whereinThe puppet of matrix is sought in expression Inverse, output card (A) a decoded symbol compares card (A) and NRSize；Card if (A) ＞ 2, receiver randomly selects N in set AR- 1=1 signals constitute signal set C to be solved, then card (C)=1, the space characteristics e of signal in set Ci= hipi, i ∈ C, by remaining signal composition interference set I in set A, then card (I)=2, the signal in set I is synthesized, The space characteristics of cumulative interference areBecause the symbol sent is all made of BPSK modulation, 2 are sharedcard(I) =4 kinds of signals synthesize situation, it is assumed that modulation constellation has centre symmetry, then only needs to considerKind interference synthesis feelings Condition, i.e. eεThere are two probable values；
5th step, receiver is first by the space characteristics e of signal to be solvedi, i ∈ C and cumulative interference eεIt is orthogonal to carry out Schmidt Change, obtains one group of orthonormal basisThen it is calculated according to orthonormal basis each in zero-forcing detector filtering matrix G Filter vector fi, i ∈ C,
This zero-forcing detector filtering matrix G is subjected to conjugate transposition, obtains GH, eεDiversity cause zero-forcing detector filter square Battle array G shares 2card(I)-1=2 kinds, wherein only a kind of be consistent with the symbol situation of actual transmission.Fig. 3 describes signal x0Belong to Set C, and when remaining signal belongs to set I, filter vector f in zero-forcing detector filtering matrix G0Design method, receive prow First the signal in I is synthesized and obtains the space characteristics e of cumulative interferenceε；Then to eεSchimidt orthogonalization is carried out, is obtained Orthonormal basisThe building method that filter vector in the zero-forcing detector filtering matrix G is finally walked using this is obtainedIt should be noted that 1 the 4th step according to embodiments of the present invention obtains eεThere are two probable value eε1、eε2, Fig. 3 is to choose eε=eε1In the case of filter vector design diagram.
6th step, it is two-way that receiver, which first divides mixed signal y, then uses two zero-forcing detectors of step 5 design Filtering matrix G is respectively filtered mixed signal, and compares the SNR/SINR for receiving signal, preferentially one reception of judgement output Symbol,i∈C；
7th step, receiver will be mixed using the symbol and channel information reconstruction signal solved, then using serial interference elimination Close the symbol solved in signal ySignal corresponding to i ∈ CIt eliminates, obtains,
8th step, receiver delete decoded signal from set A, by the way that set A-C is assigned to set A update set A is back to FOUR EASY STEPS.
Fig. 4 gives the specific receiver structure figure of the embodiment of the present invention 1, illustrates that the embodiment of the present invention 1 filters in figure It receives, the operating process of serial interference elimination and recovery residual signal.Fig. 4 is first by x0As desired signal to be solved, and will Other signals are as interfering and carrying out interference synthesis, and according to the 6th step, y points by receiving terminal mixed signal of receiver is two-way, and Zero-forcing detector filtering matrix G is respectively adopted1With G2Reception is filtered to mixed signal, and compares the SNR/SINR for receiving signal, Preferentially judgement outputAnd it willFeed back to receiver；It then, will be decoded using serial interference elimination according to the 7th step Corresponding signalIt eliminates, obtainsFinally design zero-forcing detector filtering matrix WZFIt receives Output
Embodiment 2
On the basis of embodiment 1, when the antenna number difference of each transmitter configuration, the side of each transmitter transmission data Formula is different.As transmitting antenna number NTWhen=1, transmitter sends a circuit-switched data using theaomni-directional transmission mode, at this point, in embodiment 1 Transmitting antenna number is equal to the 1 corresponding h of transmitterkpkH should be replaced withk, sky of the corresponding transmission signal of the transmitter in receiving terminal Between feature become ek=hk；As transmitting antenna number NTWhen >=2, transmitter sends a circuit-switched data using beam forming transmission mode, such as Described in preceding embodiment 1.
Embodiments of the present invention also reside in, and the 5th step is more than reception antenna number N when transmission signal numberRWhen, first carry out Interference synthesis, makes the signal number of receiving terminal be reduced to NR, then force zero and serial interference elimination is used to carry out connecing for multi-user data It receives；There are a variety of situations to cause cumulative interference there are a variety of synthesis situations for modulated transmission symbol, and the present invention is according to different It synthesizes situation and designs corresponding zero-forcing detector filtering matrix G, and it is multichannel that receiving terminal mixed signal y, which is divided, using designed G Every road mixed signal is filtered respectively, by comparing the SNR/SINR for receiving signal, preferentially judgement output correctly receives Symbol.
The application effect of the present invention is described further by emulation experiment below：
Fig. 5 gives embodiment 1 and is based on NT=2, NRThe system data rates performance that=2 and K=3 is obtained, similarly according to reality The method for applying example 1 simulates fixed reception end antenna number NR=2, when emitting { 3,4,5 } ∈ symbolic number K, the number of the method for the present invention According to rate capability.Traditional zero-forcing detector method requires subsequent signal number to be no more than receiver antenna number, so working as K>NRWhen, nothing Method is handled mixed signal using zero-forcing detector, and institute's extracting method of the present invention is in the limited energy of receiving terminal antenna number Restore all transmission datas.As shown in figure 5, giving as K ∈ { 3,4,5 } and K>NRWhen, institute's extracting method of the present invention can receive All data and rate the case where changing with signal-to-noise ratio, with the increase of signal-to-noise ratio, system data rates performance is also gradual It improves；Since institute's extracting method can restore all transmission signals, so with the increase of K, the recoverable signal number of receiver increases Add, system data rates performance is also gradually increased.
Fig. 6 gives the embodiment of the present invention 2 and is based on NT=1, NRThe system data rates performance that=2 and K=3 is obtained, is sending out Symbol K is sent to be more than reception antenna number NRIn the case of, the method for reseptance that the present invention designs can break through traditional zero-forcing detector method It is required that reception antenna number is no less than the limitation of signal number to be solved, all transmission symbols are received, from fig. 6, it can be seen that with The increase of signal-to-noise ratio, the system data rates performance obtained by the method for the present invention is also gradually improved.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.

Claims (3)

1. a kind of multi-user reception method of force zero and serial interference elimination based on interference synthesis, in multiple concurrent transmitters Realize that system receiver obtains the channel state information between each transmitter with the ascending communication system of a public-address receiver And the modulation system information that transmitter uses, the signal number that receiving terminal is handled is down to by reception day using interference synthesis first Then line number calculates corresponding zero-forcing detector filtering matrix according to different signal synthesis situations, and respectively to mixed signal into Row filtering is made decisions by being compared to filtering performance to receiving symbol, has been solved using method for eliminating serial interference elimination Then the influence that code sign receives residual components in mixed signal repeats using cumulative interference remaining mixed signal, calculates Filtering matrix compares judgement, until the symbol that whole transmitters are sent is restored, the method for reseptance includes the following steps：
The first step, each transmitter configure NTRoot transmitting antenna, NT>=2, the radiation pattern for being all made of beam forming sends a way According to transmitter calculates precoding vector p according to respective channel informationk, the modulation system information per road transmission data is obtained, and It is the maximum modulation system information of order of modulation in modulation system used to take L, and K transmitter sends signal number K and be more than receiver Antenna number NR, the transmission power of each transmitter is PT；
Second step, transmitter estimate channel state information hk, k=0,1 ..., K-1 are reported to together together with modulation system information L Receiver；
Third walks, and receiver receives mixed signal y,
Wherein, xkIndicate that the symbol that transmitter k is sent, n indicate that additive white Gaussian noise, the variance of noise component(s) areTransmitter The space characteristics that the signal that k is sent is shown in receiving terminal are ek=hkpk, all signals of receiving terminal are constituted into set A, then initially The signal number that state set A includes is K, i.e. card (A)=K, wherein card () indicate the number of element in set；
4th step compares card (A) and NRSize, if card (A)≤NR, receiver design zero-forcing detector filtering matrixμ ∈ card (A) are filtered y, whereinThe pseudoinverse of matrix, output are asked in expression Card (A) is a to have solved code sign；If card (A) ＞ NR, receiver randomly selects the N in set AR- 1 signal, which forms, waits for solution letter Number set C, then card (C)=NRThe space characteristics e of all signals in -1, set Ci=hipi, i ∈ C, by remaining letter in set A Number composition interference set I, the signal in set I is synthesized, the space characteristics of cumulative interference areIt sends There are a variety of situations after ovennodulation for symbol, so cumulative interference shares Lcard(I)Kind synthesis situation, it is assumed that modulation constellation has There is centre symmetry, then only needs to considerKind interference synthesis situation, i.e.,A probable value；
5th step, receiver is first by the space characteristics e of signal to be solvedi=hipi, the space characteristics e of i ∈ C and cumulative interferenceεInto Row Schimidt orthogonalization obtains one group of orthonormal basisWithThen zero-forcing detector filter is calculated according to orthonormal basis Each filter vector f in wave matrix Gi, i ∈ C,
By this NR- 1 column vector carries out conjugate transposition and obtains GH, it is based on eεDiversity, G is sharedKind, wherein only having It is a kind of to be consistent with the symbol situation of actual transmission；
6th step, receiver, which first divides mixed signal y, isThen road uses the design of the 5th stepIt is a Filtering matrix GHEvery road mixed signal is filtered respectively, and compares the signal-to-noise ratio/Signal to Interference plus Noise Ratio SNR/SINR for receiving signal, Preferentially judgement output NR- 1 reception symbol,
7th step, receiver are believed mixing using the symbol and channel information reconstruction signal solved, then using serial interference elimination Decoded N in number yR- 1 symbolCorresponding signalIt eliminates, reduces the signal of receiver processing Number, obtains：
8th step, receiver delete decoded signal from set A, update set A by the way that set A-C is assigned to A, are back to FOUR EASY STEPS.
2. the multi-user reception method of force zero and serial interference elimination according to claim 1 based on interference synthesis, It is characterized in that, in the 5th step when transmission signal number is more than reception antenna number NRWhen, interference synthesis is first carried out, the letter of receiving terminal is made Number number is reduced to NR, then using the reception of force zero and serial interference elimination progress multi-user data.
3. the multi-user reception method of force zero and serial interference elimination according to claim 1 based on interference synthesis, It is characterized in that, when there are a variety of situations to cause cumulative interference there are when a variety of synthesis situations for modulated transmission symbol, then basis Different synthesis situations designs corresponding zero-forcing detector filtering matrix G, and it is multichannel that receiving terminal mixed signal y, which is divided, using institute The G of design is respectively filtered every road mixed signal, and by comparing the SNR/SINR for receiving signal, preferentially judgement output is correct Reception symbol.
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