基于上行MIMO-SCMA系统的异步分组检测算法  

Asynchronous Grouped Detection Algorithm of Uplink MIMO-SCMA System

作　　者：王雪 周宁浩 侯嘉[1,2] WANG Xue;ZHOU Ning-hao;HOU Jia(School of Electronics&Information,Soochow University,Suzhou 215006,China;Yangze Delta Region Institute(Quzhou),University of Electronic Science and Technology of China,Quzhou 324000,China)

机构地区：[1]苏州大学电子信息学院,苏州215006 [2]电子科技大学长三角研究院(衢州),衢州324000

出　　处：《科学技术与工程》2024年第3期1100-1109,共10页Science Technology and Engineering

基　　金：国家自然科学基金(62071319,61631004)。

摘　　要：针对宏小区稀疏码分多址技术(sparse code multiple access,SCMA)系统上行链路中远近用户到达基站存在的用户时延问题,提出了按不同时延进行用户分组的异步检测算法,利用前后符号间相同的信息进行迭代,形成了一种基于连续传播的消息传递算法(message passing algorithm based on serial propagation,SP-MPA)。另外,针对MIMO-SCMA系统中运用的部分边缘化检测算法造成的误码率性能下降的问题,还提出了一种基于动态阈值的部分边缘化消息传递算法(dynamic threshold partial marginalization algorithm,DTPM-MPA)。仿真结果表明,SP-MPA有效降低了异步传输的符号干扰带来的高误码率,并且DTPM-MPA能够在计算复杂度与误码率之间做出灵活平衡。Aiming at the problem of delays of multiple users arriving at the base station in the uplink sparse code multiple access(SCMA)macro-cell system,asynchronous detection algorithms were proposed with users grouped according to different delays and the same information between symbols was utilized and iterated,forming a message passing algorithm based on serial propagation(SP-MPA).Besides,aiming at the problem of worse bit error rate caused by partial marginalization algorithm used in MIMO-SCMA system,dynamic threshold partial marginalization algorithm(DTPM-MPA)was proposed.The simulation results show that the high bit error rate caused by symbol interference of asynchronous transmission is effectively reduced with SP-MPA and a flexible balance between computing complexity and bit error rate is formed with DTPM-MPA.

关 键 词：稀疏码分多址 多输入多输出 异步 消息传递 

分 类 号：TN929.5[电子电信—通信与信息系统]