基于Rayleigh衰落信道下MISO-MU-CSDCSK通信系统性能分析  

Performance analysis of MISO-MU-CSDCSK system over Rayleigh fading channels

作　　者：张刚[1] 许嘉平 张天骐[1] ZHANG Gang;XU Jiaping;ZHANG Tianqi(Chongqing Key Laboratory of Signal and Information Processing,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《系统工程与电子技术》2018年第11期2572-2580,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61371164;61771085);重庆市教育委员会科研项目(KJ1600429)资助课题

摘　　要：基于传统多用户差分混沌移位键控(multiuser differential chaos shift keying,MU-DCSK)存在码间干扰而导致误码性能较高问题,提出了一种多用户循环移位差分混沌移位键控(multiuser cyclic shift differential chaos shift keying,MU-CSDCSK)通信系统。该系统根据用户数量将参考信号均分为N段并进行循环移位来传输不同用户,并利用Walsh码确保各用户传输信号严格正交。为进一步提高误码率性能,又深入分析了多输入单输出多用户循环移位差分混沌移位键控(multiple input single output-MU-CSDCSK,MISO-MU-CSDCSK)。推导了在Rayleigh衰落信道下的误码率公式并进行仿真。结果表明,该系统能够有效的改善误码性能,具有应用价值。A multiuser cyclic shift differential chaos shift keying(MU-CSDCSK)communication system is proposed based on the high bit error rate(BER)caused by inter-symbol interference in the traditional multiuser differential chaos shift keying(MU-DCSK).The system divides the reference signal of MU-CSDCSK into N segments in accordance with number of users and transmits different users through cyclic shift period,using Walsh codes to ensure that the signals transmitted by each user are strictly orthogonal.Besides,in-depth analysis of multiple input single output multiuser cyclic shift differential chaos shift keying(MISO-MU-CSDCSK)is studied to further improve the performance of the BER.The BER formula in Rayleigh fading channels is derived and numerous simulations are completed.The simulation results show that the system can effectively improve BER performance,and it is of great value in application.

关 键 词：多用户差分混沌移位键控 循环移位 多输入单输出 误码率 

分 类 号：TN911.3[电子电信—通信与信息系统]