改进型时间反转的多用户DCSK系统

doi:10.19665/j.issn1001-2400.2022.05.004

Abstract

Abstract:

To overcome the shortcomings of high bit error rate and low transmission rate in the shift differential chaos shift keying system based on time reverse,an improved time reversal multi-user DCSK system is proposed to improve the system BER performance and transmission rate.At the transmitter,the chaotic signal generator adopts delaying and time reversing structures to send two orthogonal reference signals.Different orthogonal Walsh codes are used to bear users’ information simultaneously to increase the transmission rate and eliminate the interference between the users,thus reducing the error rate.At the receiver,the reference signal is denoised by moving the average filter,the variance of the decision term is reduced to reduce the bit error rate of the system,and then the correlation demodulation is carried out.The new BER formula is deduced and simulated under the additive white Gaussian noise channel and the multi-path Rayleigh fading channel.The influences of the number of users N,the number of copies P,the sequence length,the SNR and the path number L on BER are analyzed.Compared with BER of the TRM-DCSK system,it is shown that in the AWGN channel,when the number of users is 2,the number of replications is 8,and is 512,the transmission rate of the system is increased by about 300% compared with the TRM-DCSK system,and that the error performance is improved by nearly 3dB,which provides a good theoretical significance and practical value for the practical engineering application of the system.

Key words: chaos shift keying, BER performance, Walsh code, time reversal, transmission rate

CLC Number:

TN911.3

ZHANG Gang,HE Ping,ZHANG Tianqi. Improved time reversal multi-user DCSK system[J].Journal of Xidian University, 2022, 49(5): 25-36.

Figures/Tables 17

L	E[ $α 12$ ]	τ₁
2	1/2,1/2	0,1
3	1/3,1/3,1/3	0,1,2
4	1/4,1/4,1/4,1/4	0,1,2,3
5	1/5,1/5,1/5,1/5,1/5	0,1,2,3,4

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Improved time reversal multi-user DCSK system

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Figures/Tables 17

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