瑞利衰落信道下SCMA码本设计  

SCMA codebooks design for Rayleigh fading channel

作　　者：雷拓峰 倪淑燕 程乃平 宋鑫 LEI Tuofeng;NI Shuyan;CHENG Naiping;SONG Xin(Company of Postgraduate Management,Space Engineering University,Beijing 101416,China;Department of Electronic and Optical Engineering,Space Engineering University,Beijing 101416,China)

机构地区：[1]航天工程大学研究生院,北京101416 [2]航天工程大学电子与光学工程系,北京101416

出　　处：《通信学报》2022年第4期107-113,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61805283)。

摘　　要：为了设计近似最优的稀疏码本,以多用户叠加星座点的误符号率性能为评价指标,分别针对上行、下行传输信道,设计了适用于瑞利衰落信道的近似最优稀疏码本。基于叠加星座点与误符号率的数学模型,提出了一种近似最优稀疏码本的设计方案,码本的设计步骤包括因子图矩阵的设计、码字对的匹配以及最优旋转角度的确定。仿真结果表明,所提码本设计方案能够达到近似最优的误符号率性能。According to the symbol error eate(SER) of the superimposed constellation,the near-optimal space code multiple access(SCMA) codebooks were explored under uplink and downlink Rayleigh fading channels,respectively.A near-optimal codebook design scheme was proposed based on the mathematical model between the superimposed constellation and the SER formula.And the proposed design procedures could be summarized as follows,design the factor graph matrix,match the best codeword pair,and find the optimal angle.Numerical results are provided to demonstrate that the proposed scheme can achieve near-optimal SER performance.

关 键 词：稀疏码分多址 近似最优码本 瑞利衰落信道 误符号率 

分 类 号：TN914.5[电子电信—通信与信息系统]