衰落信道下SCMA性能仿真研究  

Research on SCMA simulation in fading channels

作　　者：黄刚[1,2] 杨拥军[1] 

机构地区：[1]电子科技大学通信与信息工程学院,成都611731 [2]通信网信息传输与分发技术国家重点实验室,石家庄050081

出　　处：《计算机应用研究》2017年第5期1484-1486,共3页Application Research of Computers

基　　金：通信网信息传输与分发技术国家重点实验室开放课题项目(ITD-U14009/KL142600016)

摘　　要：在一种上行SCMA(稀疏码分多址)系统模型的基础上,研究了衰落信道下SCMA通信系统的误码性能。比较了AWGN(高斯)信道以及衰落信道下SCMA和SC-FDMA(单载波频分多址)两种系统的性能,分析了快衰落信道、慢衰落信道、平坦衰落信道和频率选择性衰落信道下SCMA的系统性能。仿真结果表明,与传统正交多址SC-FDMA相比,衰落信道下SCMA在用户连接数和误码性能上有一定优势。与AWGN信道相比,衰落信道使得SCMA系统误码性能迅速下降。在瑞利平坦衰落信道下,信道衰落的快慢变化导致SCMA系统误码性能最大产生约5 d B损失;在频率选择性衰落信道下,多径时延扩散致使SCMA系统误码性能最差。Abstract： Tis paper attempted to establish an upl ink sparse code mult iple access （SCMA） system aformance of SCMA system in fading channels. Firstly, it compared the prformance of SCMA and SC-FDMA systems in AWGN and fading channel. Ten it analyzed the performance of SCMA based on fast fading channel, slow fading channel, flat fading channel and frequency-selective fading channel. Simulation results show that SCMA in fading channel has a advantage on user connections and BER performance than SC-FDMA which is a traditional orthogonal mult iple access. Compared with Gaussian channel, fading channel makes BER performance of SCMA system decline rapidly. In Rayleigh flat fading channel, speed of channel fading causes BER performance of SCMA system maimum loss 5 dB ; in frequency-selective fading cha nnel,multipath time delay makes BER performance of SCMA system worst in all of these scenarios.

关 键 词：稀疏码分多址 非正交多址 瑞利衰落 平坦衰落信道 频率选择性衰落信道 

分 类 号：TN911.22[电子电信—通信与信息系统]