基于迭代剔除的SCMA多用户检测算法

doi:10.11959/j.issn.1000-436x.2018093

Abstract

Abstract:

A multi-user detection scheme based on iteration removal (RM-MPA) was proposed to solve the problem of high complexity of decoding algorithm for sparse code multiple access (SCMA) systems.Firstly,a simple and novel method to compare the decoding advantages between users was proposed.Then n users in front of them with higher decoding advantages directly decoded and removed after each iteration,the users removed no longer participate in the subsequent iteration,so the complexity of subsequent iterations decreased gradually.Moreover,two iteration removed strategies based on decoding advantages of users and orthogonal user grouped were proposed respectively.Simulation results show that the RM-MPA with removed strategies based on orthogonal user grouped,which can reduce the decoding complexity with well decoding performance,and the decoding delay is also decreased.

Key words: sparse code multiple access, message passing algorithm, multi-user detection, iteration removal strategy

CLC Number:

TN929.5

Cuitao ZHU,Ning WEI,Hanxin WANG,Zhongjie LI. Multi-user detection scheme for SCMA systems based on iteration removal[J]. Journal on Communications, 2018, 39(6): 64-72.

Figures/Tables 9

迭代次数	PMPA ＆SMPA	RM-MPA-URS $(1 \leq n \leq \frac{K}{N})$	RM-MPA-OUGR $(n = \frac{K}{N})$
第1次迭代	$K M^{d_{f}}$	$O^{1} = K M^{d_{f}}$	$K M^{d_{f}}$
第2次迭代	$K M^{d_{f}}$	$K M^{d_{f} - 1} ＜ O^{2} ＜ K M^{d_{f}}$	$K M^{d_{f} - 1}$
第3次迭代	$K M^{d_{f}}$	$K M^{d_{f} - 2} ＜ O^{3} ＜ O^{2}$	$K M^{d_{f} - 2}$
第t次迭代	$K M^{d_{f}}$	$K M^{d_{f} - (t - 1)} ＜ O^{t} ＜ O^{t - 1}$	$K M^{d_{f} - (t - 1)}$

References 19

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参数	值
用户数J	6
时频资源块数K	4
码本长度M	4
每个用户占用时频资源块数N,d_c	2
每个时频资源块上叠加的用户数d_f	3

Multi-user detection scheme for SCMA systems based on iteration removal

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