基于希尔伯特变换的多用户DCSK通信系统性能分析  

Performance Analyze for Multiuser-DCSK Communication System Based on Hilbert Transform

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：《电子与信息学报》2018年第11期2744-2751,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61771085;61371164);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市教育委员会科研项目(KJ1600429)~~

摘　　要：针对差分混沌移位键控(DCSK)传输速率低的问题,该文提出一种基于希尔伯特变换的多用户DCSK(HMU-DCSK)通信系统。在固定阶数的Walsh码条件下,通过希尔伯特变换将正交基信号集合提高1倍,并确保分配给每个用户的载波信号正交。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,相同N值下HMU-DCSK系统的传输速率是传统多用户DCSK系统的2倍;相同传输速率下HMU-DCSK系统的误码性能明显优于传统多用户DCSK系统。A multiuser Differential Chaos Shift Keying （DCSK） communication system based on Hilbert transform is proposed （HMU-DCSK）, to solve the problem of low transmission rate of DCSK. Under the condition of fixed-order Walsh codes, the set of orthogonally-based signals is doubled by the Hilbert transform and the carrier signals assigned to each user are guaranteed to be orthogonal. The Bit-Error-Rate （BER） formula in Rayleigh fading channel is derived and numerous simulations are conducted. The simulation results show that the transmission rate of HMU-DCSK system is twice that of traditional multiuser DCSK system under the same N value, meanwhile, the BER performance of HMU-DCSK system is obviously better than the traditional multi-user DCSK system under the same transmission rate.

关 键 词：混沌通信 多用户 WALSH码 希尔伯特变换 传输速率 

分 类 号：TN918[电子电信—通信与信息系统]