多用户正交多级差分混沌键控通信系统  

Multi-user orthogonal multi-level differential chaos shift keying communication system

作　　者：张刚[1] 刘金惠 张鹏 ZHANG Gang;LIU Jinhui;ZHANG Peng(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Academic Affairs Office,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学教务处,重庆400065

出　　处：《系统工程与电子技术》2021年第1期244-250,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61771085);重庆市教育委员会科研项目(KJ1600407,KJQN201900601)资助课题。

摘　　要：针对传统差分混沌键控(differential chaos shift keying,DCSK)采用多电平方式传输多进制信息导致误比特率(bit error rate,BER)高的缺点,提出一种多用户正交多级DCSK(multi-user orthogonal multi-level DCSK,MOM-DCSK)通信系统。该系统将传输的多进制信息映射为不同的传输系数,多个传输系数分别乘以对应的Walsh码后调制在信息承载信号上,并且通过不同的延时传输多用户信息。在加性高斯白噪声(additive white Gaussian noise,AWGN)信道和多径Rayleigh衰落信道中推导了系统的理论BER公式并进行了仿真分析。结果显示,该系统在传输多进制信息时拥有较好的误码性能,并且在多用户传输领域中有较好的实际应用价值。Aiming at the shortcomings of high bit error rate(BER)caused by the multi-level mode transmission of multi-ary information in the traditional differential chaos shift keying(DCSK)system,a multi-user orthogonal multi-level differential chaos shift keying(MOM-DCSK)communication system is proposed.The system maps the transmitted multi-ary information into different transmission coefficients,and the multiple transmission coefficients are multiplied by the corresponding Walsh code and modulated on the information bearing signal,which can transmite multi-user information through different delays.The BER formula of the system in the additive white Gaussian noise(AWGN)channel and the multi-path Rayleigh fading channel is derived,and the simulation analysis is carried out.The results show that the system has better bit error performance when the multi-ary information is transmitted,and has a good practical application value in the field of the multi-user transmission.

关 键 词：差分混沌键控 多用户 多进制 WALSH码 误比特率 

分 类 号：TN911.3[电子电信—通信与信息系统]