多维Star-QAM星座优化的SCMA码本  

Multi-dimensional Star-QAM constellation optimized SCMA codebook

作　　者：张丽 Zhang Li(College of Science,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学理学院,成都610039

出　　处：《现代计算机》2023年第16期60-63,68,共5页Modern Computer

摘　　要：对一种多维正交振幅调制(QAM)优化的稀疏码多址接入(SCMA)码本进行研究。不同于四环的星形正交振幅调制(Star-QAM),设计的码本增加了一组内外环从而构造了六环的三组子星座,利用四环Star-QAM的证明结果,将三组内外环半径比设置为固定值,以最大化最小欧氏距离(MED)和最小乘积距离(MPD)为优化目标,在多目标粒子群优化算法(MOPSO)的帮助下,构造了性能较优的用户码本。通过数值仿真结果表明,与已有的码本相比,提出的码本在下行瑞利衰落信道下的误码率(BER)更小,性能更优。Research on a Sparse Code Multiple Access(SCMA)Codebook Optimized for Multidimensional Orthogonal Ampli-tude Modulation(QAM).Different from the four-ring quadrature amplitude modulation(Star-QAM),the designed codebook con-structs three subconstellations of six-ring by adding a set of inner and outer rings.Using the proof results of four-ring Star-QAM,the radius ratios of the inner and outer rings of the three groups are set to a fixed value,and the maximization of the minimum Euclid-ean distance(MED)and the minimum product distance(MPD)is taken as the optimization objective.With the help of multi-objective particle swarm optimization(MOPSO),a user codebook with better performance was constructed.Numerical simula-tion results show that compared with existing codebooks,the proposed codebook has lower bit error rate(BER)and better perfor-mance in downlink Rayleigh fading channels.

关 键 词：稀疏码多址接入 星形正交振幅调制 粒子群算法 下行瑞利信道 

分 类 号：TN929.5[电子电信—通信与信息系统]