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.
作者
张刚
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)
出处
《系统工程与电子技术》
EI
CSCD
北大核心
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。
关键词
差分混沌键控
多用户
多进制
WALSH码
误比特率
differential chaos shift keying(DCSK)
multi-user
multi-ary
Walsh code
bit error rate(BER)
