改进型多用户高效DCSK通信方案的性能分析

doi:10.19665/j.issn1001-2400.2022.03.005

摘要/Abstract

摘要：

针对传统高效差分混沌移位键控系统存在误码率高且传输速率较低的缺点,提出一种改进型多用户高效差分混沌移位键控通信方案。该方案引入了一种正交混沌信号发生器,可产生两路相互正交的混沌信号。发送端的发送信号分为两个时隙,第1个时隙传输两路正交混沌信号的线性组合作为参考信号,第2个时隙将两路混沌信号分别调制信息比特后叠加传输,最后通过正交调制技术实现传输速率的翻倍。系统还引入了正交的沃尔什码序列,达到传输多用户信息的目的。在接收端,从接收信号中分离出参考信号和信息信号,利用相关解调的方法恢复出发送的信息比特。通过引入均值滤波器对部分接收信号进行平均,进一步提升系统误码性能。推导了加性高斯白噪声信道和多径瑞利衰落信道下系统的理论误码率公式,并通过蒙特卡罗实验仿真进行了验证。结果显示:该方案的设计能够有效提升系统的传输速率和误码性能。当用户数为2时,相较高效差分混沌移位键控系统,该系统传输速率提升了约300%,误码性能提升近1 dB。

关键词: 差分混沌移位键控, 多用户, 沃尔什码, 均值滤波器, 瑞利信道

Abstract:

Aiming at the disadvantages of high bit error rate (BER) and low transmission rate in the traditional high efficiency differential chaos shift keying (HE-DCSK) system,an improved multiuser high-efficiency differential chaos shift keying communication scheme is proposed.The scheme introduces an orthogonal chaotic signal generator that can generate two mutually orthogonal chaotic signals.The transmitter signal is divided into two time slots:the first time slot transmits a linear combination of two orthogonal chaotic signals as the reference signal,and the second time slot modulates the information bits of the two chaotic signals separately and then superimposes them for transmission,and finally the transmission rate is doubled by the quadrature modulation technique.The system also introduces an orthogonal Walsh code sequence for the purpose of transmitting multi-user information.At the receiver,the reference and information signals are separated from the received signal and the transmitted information bits are recovered using correlation demodulation.The system BER performance is further improved by introducing a mean filter to average some of the received signals.The theoretical BER formulation of the system is derived for additive Gaussian white noise channels and multipath Rayleigh fading channels and verified by Monte Carlo experimental simulations.The results show that the design of the scheme can effectively improve the transmission rate and BER performance of the system.When the number of users is 2,the transmission rate of this system is improved by about 300% and the BER performance is improved by nearly 1dB compared to the HE-DCSK system.

Key words: differential chaos shift keying, multiuser, Walsh code, mean filter, Rayleigh channel

中图分类号:

TN911.3

张刚,董江涛,张天骐,吴雪霜. 改进型多用户高效DCSK通信方案的性能分析[J]. 西安电子科技大学学报, 2022, 49(3): 36-47.

ZHANG Gang,DONG Jiangtao,ZHANG Tianqi,WU Xueshuang. Performance analysis for the improved multiuser high-efficiency DCSK communication scheme[J]. Journal of Xidian University, 2022, 49(3): 36-47.

图/表 13

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表1

不同系统的能量效率及传输速率对比"

系统	传输速率	能量效率
IMU-HE-DCSK	(2N)/(βT_c)	N/(N+1)
NISI-MU-CDSK	(2N)/(βT_c)	N/(N+2)
SR-MUDCSK	(PN)/ $(1 + P) β T c$	(PN)/(PN+1)
OMU-DCSK	N/(2βT_c)	N/(N+1)
HE-DCSK	1/(βT_c)	2/3

表1

图12

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