一种正交多用户差分混沌移位键控系统  

An orthogonal multi-user differential chaotic shift keying system

作　　者：贺利芳[1] 何平 蒋忠均 HE Lifang;HE Ping;JIANG Zhongjun(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Cyberspace Administration of Guizhou Province,Guiyang 550000,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]贵州省网络安全和信息化委员会办公室,贵州贵阳550000

出　　处：《华中科技大学学报（自然科学版）》2023年第11期97-104,共8页Journal of Huazhong University of Science and Technology(Natural Science Edition)

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

摘　　要：针对传统的正交差分混沌移位键控(DCSK)通信系统传输率低和误码率(BER)高的问题,提出一种正交多用户差分混沌移位键控(OMU-DCSK)通信系统.通过设计一个正交混沌信号发生器,在时域上得到三个严格相互正交的混沌载波信号,消除了信号与信号间的干扰,同时引入M个预定义子载波以进一步提高传输速率.在接收端,滑动平均滤波器用来对参考信号做降噪处理,再进行相关解调.在加性高斯白噪声(AWGN)和多径瑞利衰落信道下推导出误码率公式,并进行蒙特卡罗仿真,且与其他几种正交系统的传输速率和误码率进行对比.结果表明:该系统具有较高的传输速率和较低的误码率,证明了该系统的优越性及实际工程应用的可行性.Aiming at the problems of the low transmission rate and high bit rate error of conventional orthogonal differential chaos shift keying(DCSK)communication system,an orthogonal multi-user DCSK(OMU-DCSK)communication system was proposed.By designing a orthogonal chaotic signal generator,three chaotic carrier signals strictly orthogonal to each other were obtained in the time domain,eliminating signal-to-signal interference.Meanwhile,M predefined subcarriers were introduced to further increase the transmission rate.At the receiver,a moving average filter was used to reduce the noise of the reference signal,and then relevant demodulation was performed.The bit error rate formulas were derived and Mente Carlo simulation were carried out under additive white Gaussian noise(AWGN)and multipath Rayleigh fading channels,and the transmission rate and bit error rate was compared with those of several other orthogonal systems.Results show that this system has high transmission rate and low bit error rate,proving the superiority of the system as well as the feasibility of practical engineering applications.

关 键 词：三正交混沌信号发生器 频分复用 多用户 误码率 传输速率 

分 类 号：TP911.3[自动化与计算机技术]