Systems Engineering and Electronics ›› 2020, Vol. 42 ›› Issue (9): 2098-2106.doi: 10.3969/j.issn.1001-506X.2020.09.28

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Chaotic communication system of noise reduction multiuser correlation delay shift keying with no intra-signal interference

Gang ZHANG(), Huajie HE*(), Tianqi ZHANG()   

  1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2019-11-06 Online:2020-08-26 Published:2020-08-26
  • Contact: Huajie HE E-mail:zhanggang_cqupt@163.com;641798020@qq.com;zhangtq@cqupt.edu.cn

Abstract:

Because of the disadvantages of traditional chaotic communication system correlation delay shift keying(CDSK) scheme which has high bit error rate (BER), a chaotic communication system of noise reduction multiple-user CDSK system with no intra-signal interference is proposed. At the transmitter, the reference signal is obtained by duplicating P times of R-long chaotic sequence, and then divided into two channels. The orthogonality of Walsh code is used to make the reference signal and the information signal in each channel orthogonal to each other and the data transmission rate is further improved by combining with orthogonal modulation. At the receiver, the received signal is processed with a moving average filter to reduce the noise variance and the correlation is demodulated. The BER formula is derived and simulated about the system in additive white Gaussian noise (AWGN) channel and two-path Rayleigh fading channel. The results show that this system can effectively improve the BER performance and data transmission rate.

Key words: chaotic communication, correlation delay shift keying (CDSK), multiple-user, noise reduction, Walsh code

CLC Number: 

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