高斯信道下功率不平衡SCMA码本设计  

Design of Power Imbalance SCMA Codebook in Gaussian Channel

作　　者：高志成 李旭东 

机构地区：[1]西华大学理学院,四川 成都

出　　处：《应用数学进展》2021年第4期939-945,共7页Advances in Applied Mathematics

摘　　要：稀疏码分多址(SCMA)是一种基于码域的新型非正交多址接入技术,其将调制与稀疏扩频结合在一起,有效提高了系统的频谱效率。本文根据Latin结构提出了一种新型的功率不平衡码本,在不同码本之间、同一码本的不同维度之间均引入功率差异,极大提高了码本功率的多样性,并通过遗传算法优化参数,增大组合星座点间的最小欧式距离,仿真结果表明提出的码本在高斯信道下误码率性能较以往码本有明显改善。Sparse Code Division Multiple Access (SCMA) is a new non-orthogonal multiple access technology based on code domain. It combines modulation with sparse spread spectrum to effectively improve the spectral efficiency of the system. Based on the Latin structure, this paper puts forward a new type of power imbalance code book, which introduces power differences between different codebooks and between different dimensions of the same codebook, greatly improving the diversity of codebook power. The parameters are optimized by genetic algorithm, and the minimum Euclidean distance between combined constellation points is increased. Simulation results show that the bit error rate performance of the proposed codebook in Gaussian channel is improved compared with that of the previous codebook.

关 键 词：稀疏码分多址 Latin结构 高斯信道 功率差异 

分 类 号：TN9[电子电信—信息与通信工程]