计算机科学 ›› 2019, Vol. 46 ›› Issue (1): 138-142.doi: 10.11896／j.issn.1002-137X.2019.01.021
所属专题： 网络通信
李茂1,2, 周志刚1, 王涛1,2
LI Mao1,2, ZHOU Zhi-gang1, WANG Tao1,2
摘要： 稀疏码分多址(即非正交多址)(Sparse Code Multiple Access,SCMA)技术,具有在有限频谱资源下过载通信的特点,能够显著提升频谱利用率。得益于稀疏码分多址码本的稀疏性,消息传递算法(Message Passing Algorithm,MPA)成为经典多用户检测算法。在传统MPA方法中,尽管与最大似然译码具有相近的误比特率(Bit Error Ratio,BER)性能,但指数运算的复杂度仍然很高。据此,设计一种基于置信度的动态边缘选择更新方法,以减少不必要的节点运算。每次迭代中,利用因子图模型中功能节点到变量节点的置信度稳定性信息,动态判定是否需要节点更新运算。仿真结果表明,动态边缘选择方案使得算法的复杂度得到显著降低,并且能够与BER取得良好的均衡。
中图分类号:
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