稀疏码多址接入多用户检测算法综述

Survey of Multi-user Detection Algorithms for Sparse Code Multiple Access System

稀疏码多址接入(SCMA)是一种非正交多址接入技术,具备高频谱效率和大连接特性。多用户检测是SCMA系统的关键问题,而如何降低检测算法的复杂度成为多址接入领域的研究热点。该文从影响算法复杂度的不同因素入手,分类综述了现有多用户检测算法并对几种典型算法进行了原理剖析和性能对比。同时,指出了SCMA多用户检测算法的改进思路。最后总结并探讨了SCMA检测算法未来的发展趋势和面临的挑战。

Sparse Code Multiple Access(SCMA)is a non-orthogonal multiple access scheme with high spectrum efficiency and massive connectivity.Multi-user detection is a key issue of SCMA system and how to reduce the complexity of detection algorithms has become a research hotspot in the field of multiple access.This paper reviews the existing multi-user detection algorithms from different factors that affect the complexity of the algorithms.Furthermore,the principle and performance of several typical multi-user detection algorithms are introduced and compared.In addition,the improved ideas of multi-user detection algorithms for SCMA system are pointed out in this paper.Finally,the future development trend and challenges of SCMA detection algorithms are summarized and discussed.