CN103841065B - Nonopiate multiple access is sent and joint receives demodulation coding system and method - Google Patents
Nonopiate multiple access is sent and joint receives demodulation coding system and method Download PDFInfo
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Abstract
Nonopiate multiple access is sent and joint receives demodulation coding system and method, belong to field of communication technology, which is characterized in that in transmitting terminal, multiple users use non-orthogonal manner access system, signal is respectively channel encoded, coded identification mapping, interweave and modulation treatment；In receiving terminal, reception signal is multiplied by the characteristic sequence of each user respectively, is successively handled by Multiuser Detection, demodulation, deinterleaving and decoding, output result is then subjected to Multiuser Detection again, realizes iterative process.This method is based on message transmission thought, and the output Soft Inform ation of decoder is sent directly into Multiuser Detection, realizes that decoding and the Joint iteration of Multiuser Detection are handled.Under linear computation complexity, the present invention can realize good interference elimination performance, and the influence of relatively low ambient noise and interference to signal message, preferable error performance and more reliable laser propagation effect are obtained, the present invention can realize that multi-user interference is eliminated and the joint of decoding carries out simultaneously, be conducive to the realization of parallel organization.
Description
Technical field
Nonopiate multiple access is sent and joint receives demodulation coding system and method and belongs to field of communication technology, especially
The joint reception demodulation for being related to a kind of nonopiate multiple access in multi-user comm and elimination inter-user interference is translated
Code System and method for.
Background technology
In order to reduce cost and efficiently utilize the resource of communication system, existing communication system generally uses CDMA
(Code Division Multiple Access, CDMA), interlacing multi-address (Interleaver Division Multiple
Access, IDMA) etc. nonopiate access way distinguish different users, with the increase of number of users, inter-user interference meeting
Increase, so as to the hydraulic performance decline of entire communication system.
The traditional methods for eliminating multiuser interference are to regard inter-user interference as additive noise, separately detect each
The information of a user, system performance are severely limited by interference.Another kind of method is Multiuser Detection, no longer by interference at noise
Reason, but the information with certain structure is considered as, specifically using the correlation properties between address code, inhibit even to eliminate
The influence of multi-access inference.
It is whether linear according to algorithm, existing multiuser detection algorithm can be divided into Linear Multiuser Detection algorithm and non-
Linear Multiuser Detection algorithm.Linear Multiuser Detection algorithm is to make a line to the output vector y of traditional matched filter
Property operation L, to eliminate the influence of multi-access inference.This method is related to matrix inversion operation, and computation complexity is usually higher.
The basic thought of Multi-User Detection algorithm is that interference is eliminated, that is, subscriber signal after testing is reconstructed, by it from reception
Other users are detected again after being eliminated in signal.This method can cause the propagation of error, bring larger delay.
The present invention proposes nonopiate multiple access and sends and combine reception demodulation coding system and method.The algorithm
Main thought is in transmitting terminal, and multiple users use non-orthogonal manner access system, in receiving terminal, based on message transmission thought,
The output Soft Inform ation of decoder is sent directly into Multiuser Detection, realizes that decoding and the Joint iteration of Multiuser Detection are handled.
Under linear computation complexity, the present invention can realize good interference elimination performance.
Invention content
It is sent the object of the present invention is to provide nonopiate multiple access and joint receives demodulation coding system and method.
Transmitting terminal, multi-user are accessed using non-orthogonal manner, in receiving terminal, using message passing mechanism, realize that decoding is examined with multi-user
The Joint iteration processing of survey.The present invention is suitable for the multi-user comm of nonopiate access, is done between user the purpose is to reduce
It disturbs, improves the performance of transmission.
Nonopiate multiple access is sent and joint receives demodulation coding system, which is characterized in that it is divided into two big systems, one
It is the nonopiate access of multi-user and transmission system, first, the joint of multiple user signals receives demodulation coding system, wherein:
(1) the nonopiate access of multi-user and transmission system, equipped with channel coding module, coded identification mapping block, interweave
Module and modulation module, wherein：
Channel coding module：To the information sequence b of k-th of userkCarry out channel coding, k=1,2 ..., K, by channel
Output sequence c after codingk, L is sequence c after codingkLength；
Coded identification mapping block：The sequence ckIn each symbol be each mapped to the feature that length is N
Sequence pk, N is natural number more than or equal to 1, pk={ z1,z2,...,zN, zi∈ { 1, -1 }, i=1,2 ..., N, i are characterized
The serial number of parameter z, N are characterized the number of parameter, and the mapping ruler of symbol is according to 1 → pk, 0 →-pk, map postorder and be classified as rk；
Interleaving block：The sequence r of inputkIt is interleaved, obtains sequence vk；
Modulation module：The sequence v of inputkIt is modulated, obtains sequence uk, it is sent to receiving terminal；
(2) joint of multiple user signals receives demodulation coding system, is equipped with：Multiuser detection module, demodulation reconciliation
Interleaving block and decoding module：
First by the reception sequences y of k-th of userk[n] is multiplied by the characteristic sequence p of each user symbol-by-symbolk, obtain k-th
The observer nodes of userWherein K be user number, k=1,2 ..., K, n be each symbol the time of reception, n=1,
2 ..., N', N'=NL, L be coding after sequence ckLength, N is characterized sequence pkLength, l=1,2 ..., L, willAs the input of multiuser detection module, into iterative process；
Multiuser detection module is detected according to following steps：
A is initialized, setting：T is iterations, and t is current iteration number, t=1,2 ..., T, i=1,2 ..., K, j
=1,2 ..., K, K be user number, when initial, by i-th of user moment n symbol node xi[n] is to j-th of user
Observer nodesThe message of transmissionIn xiIt is during [n]=1In xiIt is during [n]=- 1
B is calculated in the t times iterative process by the symbol node x of i-th of useri[n] is to the observer nodes of j-th of userThe message of transmission
It represents to remove i-th and j-th of user, remaining the 1 to k-th user's
The continued product of message that observer nodes are transmitted to the symbol node of i-th of user,
C is calculated respectively according to above formulaMean valueAnd variance
Wherein, αiIt represents to send assemble of symbol { -1,1 },
D calculates the observer nodes of j-th of user in the t times iterative processTo the symbol node x of i-th of useri
[n] transmits the mean value of messageAnd variance
WhereinRepresent the observer nodes of j-th of userWith the symbol node x of i-th of useriBetween [n]
Equivalent channel gain, σ2Represent the variance of white Gaussian noise,
E, based on above-mentioned mean valueAnd varianceUsing Gaussian approximation, calculate in the t times iteration
In the process, the observer nodes of j-th of userTo the symbol node x of i-th of useriThe message that [n] is transmitted
The content of exp expressions below is the finger of e
Number, andIt represents in the t times iterative process between the observer nodes of j-th user and the symbol node of i-th of user
Equivalent channel gain,
Demodulation de-interleaving block：According toI-th of user in the t times iterative process is calculated
Symbol node xi[n] is to the input node of decoderThe message of transmission
Wherein, n=1,2 ..., N', N'=NL, l=1,2 ..., L,
According to above formula, the input message of decoder is further obtained
" dec " is writing a Chinese character in simplified form for decoder decoder,Represent the input node from decoderIt is passed to decoder,
Decoding module：By the input node of the decoderThe message transmitted to decoder is mapped as log-likelihood ratio
Form, judgement obtains the information bit sequence of corresponding each user
Above-mentioned Multiuser Detection module is repeated between decoding module the step of until t=T；
Wherein：
The nonopiate multiple access is sent and joint reception demodulation coding system, in channel coding module, coding
Mode is using any one of convolutional code, LDPC code, Turbo code, Turbo product codes.
The nonopiate multiple access is sent and joint reception demodulation coding system, and in modulation module, use is orthogonal
The modulation of any one of amplitude modulation (QAM), four phase shift keying signal (QPSK), multi-system digital phase modulation (MPSK)
Mode.
The nonopiate multiple access is sent and joint reception demodulation coding system, in interleaving block, using grouping
One kind in interleaver, convolutional deinterleaver or random interleaver.
Nonopiate multiple access is sent and joint receives demodulation coding method, is divided into two big steps, first, multi-user is non-
Orthogonal access and transmission, first, the joint of multiple user signals receives demodulation coding:
(1) the nonopiate access of multi-user and forwarding step specifically include channel coding, coded identification mapping, interweave and adjust
System, transmitting terminal is to each user by step operation in detail below：
Channel coding：To the information sequence b of k-th of userkCarry out channel coding, k=1,2 ..., K, by channel coding
Output sequence c afterwardsk, L is sequence c after codingkLength；
Coded identification maps：The sequence ckIn each symbol be each mapped to the characteristic sequence that length is N
pk, N is natural number more than or equal to 1, pk={ z1,z2,...,zN, zi∈ { 1, -1 }, i=1,2 ..., N, i are characterized parameter
The serial number of z, N are characterized the number of parameter, and the mapping ruler of symbol is according to 1 → pk, 0 →-pk, map postorder and be classified as rk；
Interweave：The sequence r of inputkIt is interleaved, obtains sequence vk；
Modulation：The sequence v of inputkIt is modulated, obtains sequence uk, it is sent to receiving terminal；
(2) multiple user signals joint receive demodulation coding step, including multiuser detection, demodulation deinterleave,
Decoding：
First by the reception sequences y of k-th of userk[n] is multiplied by the characteristic sequence p of each user symbol-by-symbolk, obtain k-th
The observer nodes of userWherein K be user number, k=1,2,3 ..., K, n be each symbol the time of reception, n=
1,2 ..., N', N'=NL, L be coding after sequence ckLength, N is characterized sequence pkLength, l=1,2 ..., L,
It willAs the input of multiuser detection module, into iterative process；
Multiuser detection, according to following steps：
A is initialized, setting：T is iterations, and t is current iteration number, t=1,2 ..., T, i=1,2 ..., K, j
=1,2 ..., K, K be user number, when initial, by i-th of user moment n symbol node xi[n] is to j-th of user
Observer nodesThe message of transmissionIn xiIt is during [n]=1In xiIt is during [n]=- 1
B is calculated in the t times iterative process by the symbol node x of i-th of useri[n] is to the observer nodes of j-th of userThe message of transmission
It represents to remove i-th and j-th of user, remaining the 1 to k-th user's
The continued product of message that observer nodes are transmitted to the symbol node of i-th of user, symbol " Π " represent even to multiply, and p represents certain in K
A user, symbol " ∩ " represent the meaning of ' and ',
C is calculated respectively according to above formulaMean valueAnd variance
Wherein, αiIt represents to send assemble of symbol { -1,1 }；
D calculates the observer nodes of j-th of user in the t times iterative processTo the symbol node x of i-th of useri
[n] transmits the mean value of messageAnd variance
WhereinRepresent the observer nodes of j-th of userWith the symbol node x of i-th of useriBetween [n]
Equivalent channel gain, σ2Represent the variance of white Gaussian noise,
E, based on above-mentioned mean valueAnd varianceUsing Gaussian approximation, calculate in the t times iteration
In the process, the observer nodes of j-th of userTo the symbol node x of i-th of useriThe message that [n] is transmitted
Demodulation deinterleaves：According toThe symbol of i-th of user in the t times iterative process is calculated
Number node xi[n] is to the input node of decoderThe message of transmission
Wherein, n=1,2 ..., N', N'=NL, l=1,2 ..., L,
According to above formula, the input message of decoder is further obtained
Decoding：By the input node of the decoderThe message transmitted to decoder is mapped as the shape of log-likelihood ratio
Formula, judgement obtain the information bit sequence of corresponding each user
Above-mentioned Multiuser Detection step is repeated to decoding procedure, until t=T.
The nonopiate multiple access is sent and joint reception demodulation coding method, in channel coding step, coding
Mode is using any one of convolutional code, LDPC code, Turbo code, Turbo product codes.
The nonopiate multiple access is sent and joint reception demodulation coding method, and in modulation step, use is orthogonal
The modulation of any one of amplitude modulation (QAM), four phase shift keying signal (QPSK), multi-system digital phase modulation (MPSK)
Mode.
The nonopiate multiple access is sent and joint reception demodulation coding method, in interleaving steps, using grouping
Any one of interleaver, convolutional deinterleaver and random interleaver.
Method is compared with conventional multi-user interference elimination method with following two notable features in the present invention：
(1) interference performance enhancing is eliminated；
(2) computational complexity reduces；
Description of the drawings
Fig. 1 is the nonopiate access of multi-user of the present invention and transmission flow figure.
Fig. 2 is that multi-user association of the present invention receives demodulation coding flow chart.
Fig. 3 is the simulation curve in the case of Case 1 and Case 2.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
Nonopiate multiple access proposed by the present invention is sent and joint receives demodulation coding system and method, is given below
Workflow is easy to understand objects, features and advantages of the present invention.Two big systems are broadly divided into, are connect first, multi-user is nonopiate
Enter and send, first, the joint of multi-user receives demodulation coding.
(1) as shown in Figure 1, the nonopiate access of multi-user and transmission system, map equipped with channel coding module, coded identification
Module, interleaving block and modulation module (each operation according to the following steps per family)：
Channel coding module：To the information sequence b of k-th of userkCarry out channel coding, k=1,2 ..., K, by channel
Output sequence c after codingk, L is sequence c after codingkLength；
Coded identification mapping block：The sequence ckIn each symbol be each mapped to the feature that length is N
Sequence pk, N is natural number more than or equal to 1, pk={ z1,z2,...,zN, zi∈ { 1, -1 }, i=1,2 ..., N, i are characterized
The serial number of parameter z, N are characterized the number of parameter, and the mapping ruler of symbol is according to 1 → pk, 0 →-pk, map postorder and be classified as rk；
Interleaving block：The sequence r of inputkIt is interleaved, obtains sequence vk；
Modulation module：The sequence v of inputkIt is modulated, obtains sequence uk, it is sent to receiving terminal；
(2) joint of multiple user signals receives demodulation coding system, is equipped with：Multiuser detection module, demodulation reconciliation
Interleaving block and decoding module：
First by the reception sequences y of k-th of userk[n] is multiplied by the characteristic sequence p of each user symbol-by-symbolk, obtain k-th
The observer nodes of userWherein K be user number, k=1,2 ..., K, n be each symbol the time of reception, n=1,
2 ..., N', N'=NL, L be coding after sequence ckLength, N is characterized sequence pkLength, l=1,2 ..., L, willAs the input of multiuser detection module, into iterative process；
Multiuser detection module is detected according to following steps：
A is initialized, setting：T is iterations, and t is current iteration number, t=1,2 ..., T, i=1,2 ..., K, j
=1,2 ..., K, K be user number, when initial, by i-th of user moment n symbol node xi[n] is to j-th of user
Observer nodesThe message of transmissionIn xiIt is during [n]=1In xiIt is during [n]=- 1
B is calculated in the t times iterative process by the symbol node x of i-th of useri[n] is to the observer nodes of j-th of userThe message of transmission
C is calculated respectively according to above formulaMean valueAnd variance
D calculates the observer nodes of j-th of user in the t times iterative processTo the symbol node x of i-th of useri
[n] transmits the mean value of messageAnd variance
E, based on above-mentioned mean valueAnd varianceUsing Gaussian approximation, calculate in the t times iteration
In the process, the observer nodes of j-th of userTo the symbol node x of i-th of useriThe message that [n] is transmitted
Demodulation de-interleaving block：According toI-th of user in the t times iterative process is calculated
Symbol node xi[n] is to the input node of decoderThe message of transmissionAnd the input of decoder
Message；
Decoding module：By the input node of the decoderThe message transmitted to decoder is mapped as log-likelihood ratio
Form, judgement obtains the information bit sequence of corresponding each user
Above-mentioned Multiuser Detection module is repeated between decoding module the step of until t=T.
The specific embodiment of the present invention
Nonopiate multiple access proposed by the present invention is sent and joint receives demodulation coding system and method, with more than one
For user's cdma spread spectrum communication system, spreading ratio N=16, system user number is K=6, it is assumed that using the LDPC of 1/2 code check
Coding, code length 1024, using perfect power control, BPSK modulation, random interleaving, channel is awgn channel.It gives below
Go out workflow, be easy to understand objects, features and advantages of the present invention.
(1) to the information bit sequence b of each userkCarry out LDPC codings, the sequence c after being encodedk；
(2) by the sequence c after codingkDivide the sequence for being mapped as that length is N (N is the natural number more than or equal to 1)
pk={ z1,z2,...,zN},(zi∈ { 1, -1 }, i=1,2 ..., N), the sequence r after being spreadk, mapping ruler
It is as follows：1→pk, 0 →-pk, complete spread spectrum；
(3) to the sequence r after spread spectrumkRandom interleaving processing is carried out, obtains sequence vk；
(4) to sequence vkLaunch after carrying out BPSK modulation；
(5) radio frequency unit of terminal receives signal, realizes down coversion and analog to digital conversion, generates digital baseband signal；
(6) the sequence p that sequences y [n] is multiplied by each user symbol-by-symbol will be receivedk, obtain the K roads sequence of corresponding K userWherein k=1,2 ..., K, n=1,2 ..., NL, L be sequence c after codingkLength.
(7) by the observer nodes of K userMultiuser Detection node is substituted into, according toValue, with reference to confidence
Algorithm and central-limit theorem calculate message described in the t times iterative processAnd
(8) basisValue, calculate xi(n) toThe message of transmission
(9) basisIt calculatesThe message transmitted to decoder
It (10) in a decoder, will be above-mentionedThe message transmitted to decoder is mapped as the form of log-likelihood ratio:Based on log-likelihood ratio, the information bit sequence of corresponding each user is obtained
(11) (7)-(11) are repeated the above process, until meeting iterations.
Computer Simulation test is carried out to above system, has obtained following result：
Following two groups of simulation parameters are set, as shown in table 1.
Table 1
Fig. 3 illustrates the simulation curve in the case of Case 1 and 2 two kinds of Case, is calculated with the iteration MMSE in the case of two kinds
Method is compared, and the Joint iteration algorithm under identical iterations can effectively improve the performance of system, and with iterations
Increase, the performance of Joint iteration algorithm be more nearly single user it is noiseless when performance.
The effect of the present invention is the propagation on factor graph that is formed by using external information in Multiuser Detection node and more
New the characteristics of making external information relatively reliable, the relatively low influence of ambient noise and interference to signal message, obtained compared with
Low error code result and more reliable laser propagation effect, at the same this algorithm can realize multi-user interference eliminate and decoding combine into
Row, is conducive to the realization of parallel organization.Therefore, multi-user interference is eliminated, this method is substantially better than other methods.
Claims (12)
1. nonopiate multiple access is sent and joint receives demodulation coding system, which is characterized in that it is divided into two big systems, when
The nonopiate access of multi-user and transmission system, first, the joint of multiple user signals receives demodulation coding system, wherein:
(1) the nonopiate access of multi-user and transmission system, equipped with channel coding module, coded identification mapping block, interleaving block
And modulation module, wherein:
Channel coding module：To the information sequence b of k-th of userkCarry out channel coding, k=1,2 ..., K, by channel coding
Output sequence c afterwardsk, L is sequence c after codingkLength；
Coded identification mapping block：The sequence ckIn each symbol be each mapped to the characteristic sequence that length is N
pk, N is natural number more than or equal to 1, pk={ z1,z2,...,zN, zi∈ { 1, -1 }, i=1,2 ..., N, i are characterized parameter
The serial number of z, N are characterized the number of parameter, and the mapping ruler of symbol is according to 1 → pk, 0 →-pk, map postorder and be classified as rk；
Interleaving block：The sequence r of inputkIt is interleaved, obtains sequence vk；
Modulation module：The sequence v of inputkIt is modulated, obtains sequence uk, it is sent to receiving terminal；
(2) joint of multiple user signals receives demodulation coding system, is equipped with：Multiuser detection module, demodulation deinterleave
Module and decoding module:
First by the reception sequences y of k-th of userk[n] is multiplied by the characteristic sequence p of each user symbol-by-symbolk, obtain k-th of user
Observer nodesWherein K be user number, k=1,2 ..., K, n be each symbol the time of reception, n=1,
2 ..., N', N'=NL, L be coding after sequence ckLength, N is characterized sequence pkLength, l=1,2 ..., L, willAs the input of multiuser detection module, into iterative process；
Multiuser detection module is detected according to following steps：
A is initialized, setting：T is iterations, and t is current iteration number, t=1,2 ..., T, i=1,2 ..., K, j=1,
2 ..., K, K be user number, when initial, by i-th of user moment n symbol node xiThe sight of [n] to j-th of user
Survey nodeThe message of transmissionIn xiIt is during [n]=1In xiIt is during [n]=- 1
B is calculated in the t times iterative process by the symbol node x of i-th of useri[n] is to the observer nodes of j-th of user
The message of transmission
It represents to remove i-th and j-th of user, the observation section of remaining the 1 to k-th user
The continued product of message o'clock transmitted to the symbol node of i-th user,
C is calculated respectively according to above formulaMean valueAnd variance
D calculates the observer nodes of j-th of user in the t times iterative processTo the symbol node x of i-th of useri[n] is passed
Pass the mean value of messageAnd variance
E, based on above-mentioned mean valueAnd varianceUsing Gaussian approximation, calculate in the t times iterative process
In, the observer nodes of j-th of userTo the symbol node x of i-th of useriThe message that [n] is transmitted
Demodulation de-interleaving block：According toThe symbol of i-th of user in the t times iterative process is calculated
Number node xi[n] is to the input node of decoderThe message of transmission
Wherein, n=1,2 ..., N', N'=NL, l=1,2 ..., L,
According to above formula, the input message of decoder is further obtained
Decoding module：By the input node of the decoderThe message transmitted to decoder is mapped as the shape of log-likelihood ratio
Formula, judgement obtain the information bit sequence of corresponding each user
Above-mentioned multiuser detection module is repeated between decoding module the step of until t=T.
2. nonopiate multiple access according to claim 1 is sent and joint receives demodulation coding system, feature exists
In in channel coding module, coding mode is using any one of convolutional code, LDPC code, Turbo code, Turbo product codes.
3. nonopiate multiple access according to claim 1 is sent and joint receives demodulation coding system, feature exists
In in modulation module, using quadrature amplitude modulation (QAM), four phase shift keying signal (QPSK), multi-system digital phase modulation
Any one of (MPSK) modulation system.
4. nonopiate multiple access according to claim 1 is sent and joint receives demodulation coding system, feature exists
In in interleaving block, using any one of Block Interleaver, convolutional deinterleaver and random interleaver.
5. nonopiate multiple access according to claim 1 is sent and joint receives demodulation coding system, feature exists
In, in multiuser detection module,Mean valueAnd varianceBy following public affairs
Formula calculates：
Wherein, αiIt represents to send assemble of symbol { 1,1 }.
6. nonopiate multiple access according to claim 1 is sent and joint receives demodulation coding system, feature exists
In, in multiuser detection module, the observer nodes of j-th of userTo the symbol node x of i-th of useri[n] is passed
Pass the mean value of messageAnd variance
WhereinRepresent the observer nodes of j-th of userWith the symbol node x of i-th of useriIt is equivalent between [n]
Channel gain, σ2Represent the variance of white Gaussian noise.
7. the nonopiate multiple access of the system applied to claim 1 is sent and joint receives demodulation coding method, special
Sign is, is divided into two big steps, first, the nonopiate access of multi-user and transmission, are translated first, the joint of multiple user signals receives demodulation
Code:
(1) the nonopiate access of multi-user and forwarding step specifically include channel coding, coded identification mapping, interweave and modulate, hair
Sending end is to each user by step operation in detail below：
Channel coding：To the information sequence b of k-th of userkChannel coding is carried out, k=1,2 ..., K are defeated after channel coding
Go out sequence ck, L is sequence c after codingkLength；
Coded identification maps：The sequence ckIn each symbol be each mapped to the characteristic sequence p that length is Nk, N is
Natural number more than or equal to 1, pk={ z1,z2,...,zN, zi∈ { 1, -1 }, i=1,2 ..., N, i are characterized the sequence of parameter z
Number, N is characterized the number of parameter, and the mapping ruler of symbol is according to 1 → pk, 0 →-pk, map postorder and be classified as rk；
Interweave：The sequence r of inputkIt is interleaved, obtains sequence vk；
Modulation：The sequence v of inputkIt is modulated, obtains sequence uk, it is sent to receiving terminal；
(2) joint of multiple user signals receives demodulation coding step, including multiuser detection, demodulation deinterleaving, decoding：
First by the reception sequences y of k-th of userk[n] is multiplied by the characteristic sequence p of each user symbol-by-symbolk, obtain k-th of user
Observer nodesWherein K be user number, k=1,2,3 ..., K, n be each symbol the time of reception, n=1,
2 ..., N', N'=NL, L be coding after sequence ckLength, N is characterized sequence pkLength, l=1,2 ..., L, willAs the input of multiuser detection module, into iterative process；
Multiuser detection, according to following steps：
A is initialized, setting：T is iterations, and t is current iteration number, t=1,2 ..., T, i=1,2 ..., K, j=1,
2 ..., K, K be user number, when initial, by i-th of user moment n symbol node xiThe sight of [n] to j-th of user
Survey nodeThe message of transmissionIn xiIt is during [n]=1In xiIt is during [n]=- 1
B is calculated in the t times iterative process by the symbol node x of i-th of useri[n] is to the observer nodes of j-th of userIt passes
The message passed
It represents to remove i-th and j-th of user, remaining the 1st observation to k-th of user
The continued product of message that node is transmitted to the symbol node of i-th of user,
C is calculated respectively according to above formulaMean valueAnd variance
D calculates the observer nodes of j-th of user in the t times iterative processTo the symbol node x of i-th of useri[n] is transmitted
The mean value of messageAnd variance
E is based on above-mentioned mean valueAnd varianceUsing Gaussian approximation, calculate in the t times iterative process
In, the observer nodes of j-th of userTo the symbol node x of i-th of useriThe message that [n] is transmitted
Demodulation deinterleaves：According toThe symbol section of i-th of user in the t times iterative process is calculated
Point xi[n] is to the input node of decoderThe message of transmission
Wherein, n=1,2 ..., N', N'=NL, l=1,2 ..., L,
According to above formula, the input message of decoder is further obtained
Decoding：By the input node of the decoderThe message transmitted to decoder is mapped as the form of log-likelihood ratio, sentences
Certainly obtain the information bit sequence of corresponding each user
Above-mentioned Multiuser Detection step is repeated to decoding procedure, until t=T.
8. nonopiate multiple access according to claim 7 is sent and joint receives demodulation coding method, feature exists
In in channel coding step, coding mode is using any one of convolutional code, LDPC code, Turbo code, Turbo product codes.
9. nonopiate multiple access according to claim 7 is sent and joint receives demodulation coding method, feature exists
In in modulation step, using quadrature amplitude modulation (QAM), four phase shift keying signal (QPSK), multi-system digital phase modulation
Any one of (MPSK) modulation system.
10. nonopiate multiple access according to claim 7 is sent and joint receives demodulation coding method, feature exists
In in interleaving steps, using any one of Block Interleaver, convolutional deinterleaver and random interleaver.
11. nonopiate multiple access according to claim 7 is sent and joint receives demodulation coding method, feature exists
In, multi-user examines joint and surveys in step,Mean valueAnd varianceBy following public affairs
Formula calculates：
Wherein, αiIt represents to send assemble of symbol { 1,1 }.
12. nonopiate multiple access according to claim 7 is sent and joint receives demodulation coding method, feature exists
In, in multiuser detection step, the observer nodes of j-th of userTo the symbol node x of i-th of useri[n] is passed
Pass the mean value of messageAnd variance
WhereinRepresent the observer nodes of j-th of userWith the symbol node x of i-th of useriIt is equivalent between [n]
Channel gain, σ2Represent the variance of white Gaussian noise.
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