基于串并结合策略的SCMA多用户检测

稀疏码分多址接入（SCMA）是促进第五代移动通信系统发展的重要无线空口技术支撑，能够满足海量连接的需求。针对上行SCMA通信系统接收端使用的基于串行消息传递算法（MPA）的多用户检测迭代运行时间长，导致系统时延的问题，提出一种串并结合SCMA多用户检测算法，充分融合了串并行消息传递特点。仿真结果表明，相比串行MPA多用户检测算法，所提算法可降低系统的复杂度，且每轮迭代运行时间减少,从而减小了时延，实现了误比特率性能与系统时延、系统复杂度之间理想的平衡。

SCMA multiuser detection based on string parallel combination strategy

Sparse Code Division Multiple Access(SCMA) is an important wireless air port technology support for the development of the fifth generation mobile communication system,which can meet the needs of mass connection.Aiming at the problem of system delay based on the serial Message Passing Algorithm(MPA) used by the receiver of the uplink SCMA communication system,a combined serial SCMA multiuser detection(MUD) algorithm is proposed by full integration of serial parallel MPA.The simulation results show that compared with the serial MPA MUD algorithm,this proposed algorithm can reduce the complexity of the system,and reduce the run time of each iteration to reduce the system delay.Furthermore,the ideal balance between bit error rate(BER) performance and system latency,system complexity is achieved.