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

Abstract

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

CLC Number:

TN911.3

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.

Figures/Tables 13

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

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Performance analysis for the improved multiuser high-efficiency DCSK communication scheme

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