【摘要】 多输入多输出稀疏码分多址（multiple-input multiple-output sparse code multiple access，简称MIMOSCMA）系统具有大容量和高频谱效率，能够满足大规模机器通信场景低时延和大连接的需求．针对MIMOSCMA系统检测复杂度高的问题，对基于部分消息更新的多天线与多用户联合检测进行研究，提出软判决联合消息传递算法（soft decision joint message passing algorithm，简称SD-JMPA）和硬判决联合消息传递算法（hard decision joint message passing algorithm，简称HD-JMPA）．仿真实验结果表明：SD-JMPA和HDJMPA的误比特率（bit error ratio，简称BER）均与最大似然（maximum likelihood，简称ML）和联合消息传递算法（joint message passing algorithm，简称JMPA）的BER相近；SD-JMPA和HD-JMPA均具有与JMPA大概一致的收敛性；低信噪比场景下，选择使用SD-JMPA；高信噪比场景下，选择使用HD-JMPA．因此，相对于ML和JMPA,SD-JMPA和HD-JMPA均具有更强综合性能．更多还原

【Abstract】 Multiple-input multiple-output sparse code multiple access(MIMO-SCMA)system has large capacity and high spectral efficiency,which can meet the requirements of low latency and large connection in massive machine type communication scenarios.Aiming at the high detection complexity of MIMO-SCMA system,soft decision joint message passing algorithm(SD-JMPA)and hard decision joint message passing algorithm(HD-JMPA)were proposed to study multi-antenna and multi-user joint detection based on partial message updating.According to the simulation results,the bit error ratio(BER)of SD-JMPA and HD-JMPA were similar to that of maximum likelihood(ML)and joint message passing algorithm(JMPA).Both SD-JMPA and HD-JMPA had the same convergence as JMPA.In low SNR scenarios,SD-JMPA was selected.In high SNR scenarios,HD-JMPA was used.Therefore,compared with ML and JMPA,SD-JMPA and HD-JMPA had stronger comprehensive performance.更多还原