Improved time reversal multi-user DCSK system

被引：0
|
作者：
Zhang G. [1 ]
He P. [1 ]
Zhang T. [1 ]
机构：
[1] School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing
来源：
Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University | 2022年 / 49卷 / 05期
关键词：
BER performance; chaos shift keying; time reversal; transmission rate; Walsh code;
D O I：
10.19665/j.issn1001-2400.2022.05.004
中图分类号：
学科分类号：
摘要：
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 multipath 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. © 2022 Science Press. All rights reserved.
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页码：25 / 36
页数：11
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共 20 条
  • [1] LI N, MARTINEZ-ORTEGA J F, DIAZ V H, Et al., A New High-Efficiency Multilevel Frequency-Modulation Different Chaos Shift Keying Communication System, IEEE Systems Journal, 12, 4, pp. 1-12, (2017)
  • [2] BAO J, XU W, WANG L, Et al., Performance Analysis and Subcarriers Power Allocation for MC-QCSK, 2015 International Conference on Wireless Communications 6- Signal Processing, pp. 1-5, (2015)
  • [3] ZHANG B, XU W, WU Y, Et al., Design and Performance Analysis of Multilevel Code-Shifted $ M $ -Ary Differential Chaos Shift Keying System, IEEE Transactions on Circuits and Systems II: Express Briefs, 66, 7, pp. 1257-1261, (2018)
  • [4] CHENG G, WANG L, XU W, Et al., I Carrier Index Differential Chaos Shift Keying Modulation, IEEE Transactions on Circuits and Systems ILExpress Briefs, 64, 8, pp. 907-911, (2016)
  • [5] CAO X, YIBO L V, HUANG T, Et al., Performance of Different DCSK Schemes over the UWB in-Body Channel, Journal of Chongqing University of Posts and Telecommunications: Natural Science Edition, 28, 1, pp. 72-77, (2016)
  • [6] LIU Z, ZHANG L, WU Z, Et al., A Secure and Robust Frequency and Time Diversity Aided OFDM-DCSK Modulation System Not Requiring Channel State Information, IEEE Transactions on Communications, 68, 3, pp. 1684-1697, (2019)
  • [7] MA H, CAI G, FANG Y, Et al., A New Enhanced Energy-Detector-Based FM-DCSK UWB System for Tactile Internet [J], IEEE Transactions on Industrial Informatics, 15, 5, (2019)
  • [8] KADDOUM G, TRAN H V, KONG L, Et al., Design of Simultaneous Wireless Information and Power Transfer Scheme for Short Reference DCSK Communication Systems[J], IEEE Transactions on Communications, 65, 1, pp. 431-443, (2016)
  • [9] CAI G, FANG Y, HAN G, Et al., Design and Analysis of Relay-Selection Strategies for Two-Way Relay Network-Coded DCSK Systems, IEEE Transactions on Vehicular Technology, 67, 2, pp. 1258-1271, (2018)
  • [10] MIAO M, WANG L, CHEN G, Et al., Design and Analysis of Replica Piecewise M-Ary DCSK Scheme for Power Line Communications with Asynchronous Impulsive Noise [J], IEEE Transactions on Circuits and Systems I: Regular Papers, 67, 12, pp. 5443-5453, (2020)
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