CN105721106B - SCMA ascending communication system multi-user test method based on serial strategy - Google Patents

SCMA ascending communication system multi-user test method based on serial strategy Download PDF

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CN105721106B
CN105721106B CN201610054883.3A CN201610054883A CN105721106B CN 105721106 B CN105721106 B CN 105721106B CN 201610054883 A CN201610054883 A CN 201610054883A CN 105721106 B CN105721106 B CN 105721106B
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user
resource
message
group
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CN105721106A (en
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董彬虹
王显俊
杜洋
党冠斌
高鹏宇
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
    • 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
    • H04L25/03312—Arrangements specific to the provision of output signals

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A kind of SCMA ascending communication system multi-user test method based on serial strategy, belongs to the signal detection field of wireless communication system.Node in traditional SCMA factor graph is divided into J group (number that J is user node) by the present invention, every group is a user node and its all resource nodes being connected with the user node, in each iterative process, successively each group of all nodes (the coupled all resource nodes of a user node) are updated.Updated node messages are utilized in the present invention in each iterative process, can effectively improve the utilization rate for having updated node messages；In the case where the number of iterations is less, BER performance of the present invention is much better than the BER performance of background technique method；Under conditions of BER performance is almost without loss, computation complexity of the invention is far below the computation complexity of background technique method.

Description

SCMA ascending communication system multi-user test method based on serial strategy
Technical field
The invention belongs to the signal detection field of wireless communication system, it is related to low dilute of a kind of fast convergence rate, complexity It dredges code multiple access and accesses (SCMA) ascending communication system multi-user test method, specially a kind of MPA detection based on serial strategy Method, for solving the problems, such as the Multiuser Detection of 5G (the 5th third-generation mobile communication) the alternative multiple access technique of mobile communication.
Background technique
Multiple access access is to wirelessly communicate one of the core technology of physical layer, it enables base station to distinguish and services multiple ends simultaneously End subscriber.In order to meet 5G (the 5th third-generation mobile communication) large capacity, magnanimity connection, low delay access etc. demands, application No. is A kind of SCMA is proposed in the patent of invention " system and method for user's Sparse Code multiple access access " of 201380059380.X (Sparse code multiple access, the access of Sparse Code multiple access) technology, Fig. 1 is SCMA ascending communication system model, SCMA spreads some neutral element in code word, and the base band data of each user only carries out nonzero digit spread spectrum on a small amount of chip Modulation, and every spread-spectrum code chip also only carries out nonzero digit band spectrum modulation by a small amount of user, SCMA encoder is in predefined code It is that each data Layer or user select a code book in this set, is then based on selected code book and directly maps data bit Into corresponding code word, the code word of multiple data Layers or user are finally subjected to nonopiate superposition, receiving end to receive signal into Row the multiuser detection based on belief propagation algorithm, i.e., parallel MPA detection method, attached drawing 2 be this method SCMA because Subgraph, parallel MPA detection method update all resource nodes in each iterative process first, then update all use Family node.
It proposes in patent of invention the system and method for access " user's Sparse Code multiple access " a kind of based on paralleling tactic MPA detection method, specifically includes the following steps:
Step 1, initialization: when iteration starts, user does not have prior information, therefore user node ujTo resource node ck's Message are as follows:J=1,2 ..., J, k=1,2 ..., K, ujFor j-th of user node, ckFor K-th of resource node, M are the number of codewords of code book,Family node u is started with for iterationjTo resource node ck Message；
Step 2 sets maximum number of iterations as tmax；
Step 3, in the t times iterative process, the message of resource node and user node is simultaneously Row updates, i.e., updates all resource node c firstkTo user node ujMessageT=1,2 ..., tmaxFor t (t=1,2 ..., tmax) the resource node c that is calculated in secondary iterative processk To user node ujMessage, xj=(x1,j,...,xK,j)ΤFor the SCMA code word of j-th of user, xl=(x1,l,...,xK,l)Τ For the SCMA code word of first of user, ykTo receive the signal that k-th of Energy Resources Service receives in signal y, (the sparse Spread Spectrum Matrix that F is transmitter SCMA encoder) is to be connected to resource node ckUser Node collection；xk,iIndicate k-th of resource of the code word of i-th of user, hk,iFor hi=(h1,i,h2,i,...,hK,i)ΤIn k-th Element, hiFor the channel vector of i-th of user；Then all user node u are updatedjTo resource node ckMessage: an iteration complete；To be connected to user node uj Set of resource nodes；
Step 4 judges t > tmaxIt is whether true, if so, execute step 5；If not, t=t+1 is then enabled, step is returned Rapid 3, carry out next iteration；
Step 5, by tmaxSecondary iteration backed off after random circulation, calculates codeword message:
Step 6, the Soft Inform ation that data bit is calculated
bjFor the data bit of j-th of user；
The judgement (hard decision) of step 7, data bit
In the above-mentioned MPA detection method based on paralleling tactic, detection accuracy and maximum number of iterations tmaxAnd message passes Broadcast mode is related.However, in practical engineering applications, with the increase of the number of iterations, the hardware computation complexity of communication system It is higher and higher, therefore the requirement to hardware is also higher and higher；And in this method all resource nodes to user node message more NewlyIt is message of the user node based on the acquisition of the t-1 times iteration to resource nodeAll user's sections Point arrives the update of resource node messageIt is based on when previous iteration is updatedAlthoughVery Good is utilized what current iteration updatedButIt is based on last grey iterative generationNot yet There is the message updated using user node in current iteration to resource node, causes its rate of convergence lower.To sum up, above-mentioned parallel Although MPA detection method can effectively improve the probability of correct decoding, since its computation complexity is higher and rate of convergence is lower, It is not able to satisfy 5G to high speed, efficient demand.
Summary of the invention
In view of the defects in the background art, the present invention proposes a kind of SCMA ascending communication systems based on serial strategy Multi-user test method.Node in traditional SCMA factor graph is divided into J group (number that J is user node) by the present invention, often Group is a user node and its all resource nodes being connected with the user node, in each iterative process, successively to every One group of all nodes (the coupled all resource nodes of a user node) are updated；The present invention is in each iteration mistake Updated node messages are utilized in journey, the utilization rate for having updated node messages can be effectively improved, and computation complexity is low, BER function admirable.
Technical scheme is as follows:
A kind of SCMA ascending communication system multi-user test method based on serial strategy, including initialization, resource node The calculating of update, data bit Soft Inform ation with user node message, data bit decision steps；It is characterized in that, described The update of resource node and user node message is that successive ignition is completed, each time in iterative process, by a user node And its user node and resource node are divided into J group, J is to use as one group by all resource nodes being connected with the user node The number of family node；Then successively the message to resource node all in each group to user node and user node to money The message of source node is updated, that is, completes the process of an iteration.
A kind of SCMA ascending communication system multi-user test method based on serial strategy, specifically includes the following steps:
Step 1, initialization: for SCMA when iteration starts, user does not have prior information, therefore user node ujTo resource section Point ckMessage are as follows:J=1,2 ..., J, k=1,2 ..., K, ujFor j-th of user node, ckFor k-th of resource node, M is the number of codewords of code book,Family node u is started with for iterationjTo resource node ckMessage；
Step 2 sets maximum number of iterations as tmax；
Step 3, in the t times iterative process, be connected first by j-th of user node and with j-th of user node All resource nodes are divided into J group, j=1,2 ..., J, J group node point as one group, by user node and resource node Biao Ji not be1,γ2,...,γJGroup；Then, γ is calculated1Message of all resource nodes of group to user nodeAnd user node Then message to resource node successively calculates γ2,...,γJThe resource node of group To user node message and user node to resource node message, an iteration complete；xj=(x1,j,...,xK,j)Τ For the SCMA code word of j-th of user, xl=(x1,l,...,xK,l)ΤFor the SCMA code word of first of user, ykTo receive in signal y The signal that k-th of Energy Resources Service receives, (the sparse Spread Spectrum Matrix that F is transmitter SCMA encoder) To be connected to resource node ckUser node collection；xk,iIndicate k-th of resource of the code word of i-th of user, hk,i∈hi= (h1,i,h2,i,...,hK,i)Τ, hi is the channel vector of user i, to be connected to user node uj Set of resource nodes；
Step 4 judges t > tmaxIt is whether true, if so, execute step 5；If not, t=t+1 is then enabled, step is returned Rapid 3, carry out next iteration；
Step 5, by tmaxSecondary iteration backed off after random circulation, calculates codeword message:
Step 6, the Soft Inform ation for calculating data bit
bjFor the data bit of j-th of user；
The judgement (hard decision) of step 7, data bit
The invention has the benefit that the message of update is more uncorrelated for resource node and user node message, Its reliability is stronger, based on the SCMA ascending communication system multi-user that the invention proposes a kind of based on the serial strategy inspection of this thought Survey method, in each iterative process, by all nodes according to each user node and the institute being connected with the user node There is resource node to be grouped as one group of mode, be divided into J group, successively the message of the node in each group is carried out more Newly.Updated node messages are utilized in the present invention in each iterative process, can effectively improve and update node messages Utilization rate；In the case where the number of iterations is less, BER performance of the present invention is much better than the BER performance of background technique method；In BER Under conditions of performance is almost without loss, computation complexity of the invention is far below the computation complexity of background technique method.
Detailed description of the invention
Fig. 1 is the SCMA ascending communication system model that background technique proposes；
Fig. 2 is the factor graph of SCMA up-link in background technique；
Fig. 3 is the factor graph of SCMA up-link in the present invention；
Fig. 4 is the BER performance comparison figure of the method for the present invention and background technique method；
Fig. 5 is the computation complexity comparison diagram of the method for the present invention and background technique method.
Specific embodiment
With reference to the accompanying drawings and examples, technical solution of the present invention is described in detail.
According to transmission conditions and the program of detection process, the following parameter of Initialize installation:
The number J=6 of user node, the code word number M=4 of code book, code word size K=4, system overload rate channel model are AWGN (white Gaussian noise) channel, and sparse Spread Spectrum Matrix isUser information bit is mapped as corresponding code word x, all user codes by SCMA encoder It is transmitted after word superposition by channel, the reception signal x of receiving endj=(x1,j, x2,j,...,xK,j)ΤIt is the SCMA code word of user j, hj=(h1,j,h2,j,...,hK,j)ΤFor the channel vector of user j, n~CN (0,σ2It Ι) is Gaussian noise；Receive the signal y that k-th of Energy Resources Service of signal y receiveskIt indicates are as follows: wherein k=1,2 ..., K, j=1,2 ..., J.
The code book of each user of transmitting terminal are as follows:
The code book of user 1 is The code book of user 2 is, The code book of user 3 is, The code book of user 4 is, The code book of user 5 is, The code book of user 6 is
Fig. 3 be the present invention is based on the SCMA factor graph of the SCMA ascending communication system multi-user test method of serial strategy, It is with the difference of background technique method factor graph: with each user node and all resources being connected with the user node Node is divided into one group, all resource nodes and user node can be divided into J group, be respectively labeled as γ1,γ2,...,γJGroup, In iterative process each time, γ is successively updated1,γ2,...,γJIn group all nodes (i.e. each user node and All resource nodes being connected with the user node).
Based on the SCMA ascending communication system multi-user test method of serial strategy at receiver, comprising the following steps:
Step 1. iterative detection starts, not the user message of priori, therefore each user obtains in corresponding code book The probability of any code word be it is identical, then the information of user node is
Step 2. enters iterative cycles, and the factor graph of the MPA detection method referring to Fig. 3 based on serial strategy will be all Resource node and user node are divided into J group, good each group of the serial number γ of label1,γ2,...,γJ；
Step 3. updates first group of γ1In all resource node and user node；Then judge whether to have updated all J The node of group executes step 4 and otherwise continues to update next group of node if update is complete；
Step 4. judges t > tmaxIt is whether true, if so, execute step 5；If not, t=t+1 is then enabled, step is returned Rapid 2, carry out next iteration；
Step 5. calculates codeword message according to the resource node that iteration exports
The codeword message that step 6. is obtained according to step 5 calculates the likelihood value of original data bits
The last hard decision original information bits of step 7., if LLRj> 0 adjudicates data bitIf LLRj≤ 0, sentence Certainly data bit
Using Matlab in the parallel MPA method of background technique and the SCMA based on serial strategy of the embodiment of the present invention BER error performance and computation complexity of the row communication system multi-user test method in awgn channel carry out simulation comparison point Analysis, simulation result are as shown in Figure 4 and Figure 5.As shown in Figure 4, in Eb/N0=12dB, the BER value of 2 iteration background techniques are 1.2 ×10-3, and BER value of the invention is 2.5 × 10-4, BER performance of the invention improves an order of magnitude；Secondly, of the invention The BER performance of 2 iteration shows that the method for the present invention can effectively reduce close to the performance of 6 iteration of background technique method in method The complexity of decoding.Since the present invention is identical as the computation complexity of background technique an iteration, the present invention is analyzed 2 times repeatedly The computation complexity of 6 iteration of computation complexity and background technique in generation is meaningful.Fig. 5 is BER=1.2 × 10-3Feelings Under condition, i.e., in the identical situation of detection performance of 2 iteration of the method for the present invention and 6 iteration of background technique, background technique method Computation complexity be 3 times of the method for the present invention, therefore, the present invention using 2 iterative process achieve that background technique 6 times repeatedly The performance in generation substantially reduces the computation complexity of system.

Claims (2)

1. a kind of SCMA ascending communication system multi-user test method based on serial strategy, including initialization, resource node and The update of user node message, the calculating of data bit Soft Inform ation, data bit decision steps；It is characterized in that, the money The update of source node and user node message is that successive ignition is completed, each time in iterative process, by a user node and Its all resource node being connected with the user node is divided into J group as one group, by user node and resource node, and J is user The message of the number of node, the user node to the resource node that then update according to current time t iteration owns in each group The message of resource node to user node be updated, and the resource node updated according to current time t iteration is to user The message of node is updated the message of user node to resource node all in each group, that is, completes the mistake of an iteration Journey.
2. a kind of SCMA ascending communication system multi-user test method based on serial strategy, comprising the following steps:
Step 1, initialization: when iteration starts, user does not have prior information, therefore user node ujTo resource node ckMessage Are as follows:ujFor j-th of user node, ckIt is provided for k-th Source node, M are the number of codewords of code book；
Step 2 sets maximum number of iterations as tmax；
Step 3, in the t times iterative process, what is be connected first by j-th of user node and with j-th of user node is all Resource node is divided into J group, j=1,2 ..., J as one group, by user node and resource node, and J group node is respectively labeled as γ1,γ2,...,γJGroup；Then, γ is calculated1Message of all resource nodes of group to user nodeAnd user node To the message of resource nodeFinally successively calculate γ2,...,γJThe resource node of group To user node message and user node to resource node message, an iteration complete；Wherein, xj=(x1,j,..., xK,j)ΤFor the SCMA code word of j-th of user, ykTo receive the signal that k-th of Energy Resources Service receives in signal y,To be connected to resource node ckUser node collection；xk,iIndicate k-th of the code word of i-th of user Resource, hk,i∈hi=(h1,i,h2,i,...,hK,i)Τ, hiFor the channel vector of user i,For connection To user node ujSet of resource nodes；
Step 4 judges t > tmaxIt is whether true, if so, execute step 5；If not, then enable t=t+1, return step 3, Carry out next iteration；
Step 5, by tmaxSecondary iteration backed off after random circulation, calculates codeword message:
Step 6, the Soft Inform ation for calculating data bit:
bjFor the data bit of j-th of user；
The judgement of step 7, data bit
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