Shuffled Multiuser Detection Schemes for Uplink Sparse Code Multiple Access Systems

The existing multiuser detection schemes for uplink (UP) sparse code multiple access (SCMA) systems are based on a parallel message update for message passing algorithm (MPA). In this letter, a shuffled MPA (S-MPA) scheme for UP SCMA systems is proposed, based on a serial message update strategy. Si...

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Bibliographic Details
Published in:IEEE communications letters Vol. 20; no. 6; pp. 1231 - 1234
Main Authors: Du, Yang, Dong, Binhong, Chen, Zhi, Fang, Jun, Yang, Lin
Format: Journal Article
Language:English
Published: New York IEEE 01.06.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
5G mobile communication
Acceleration
Bit error rate
Computational complexity
Computer simulation
Convergence
Delay
group shuffled message passing algorithm (G-S-MPA)
Message passing
message passing algorithm (MPA)
Messages
Multiple access
Multiuser detection
Serials
shuffled strategy
Sparse code multiple access (SCMA)
Strategy
Uplink
group shuffled message passing algorithm (G-S-MPA)
multiuser detection
shuffled strategy
message passing algorithm (MPA)
Sparse code multiple access (SCMA)
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Summary:The existing multiuser detection schemes for uplink (UP) sparse code multiple access (SCMA) systems are based on a parallel message update for message passing algorithm (MPA). In this letter, a shuffled MPA (S-MPA) scheme for UP SCMA systems is proposed, based on a serial message update strategy. Since the updated messages can join the message propagation immediately in current iteration, the convergence rate is accelerated, so that the complexity of the proposed S-MPA scheme can be substantially reduced with negligible bit error rate (BER) degradation. Simulations show that the proposed S-MPA scheme with two iterations provides similar BER performance to the original MPA scheme with six iterations. Furthermore, a parallel form of the proposed S-MPA scheme, termed group S-MPA, is developed to decrease the detection delay of the proposed S-MPA scheme, which offers a good BER-latency tradeoff.
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2016.2551742