Differential Chaotic Shift Keying System with Orthogonal Multiuser Noise Reduction

doi:10.7652/xjtuxb202010013

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Differential Chaotic Shift Keying System with Orthogonal Multiuser Noise Reduction

更新时间：2025-07-09

- Differential Chaotic Shift Keying System with Orthogonal Multiuser Noise Reduction
- Vol. 54, Issue 10, Pages: 108-115(2020)
- 作者机构：
  
  重庆邮电大学通信与信息工程学院,重庆,400065
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202010013
  CLC： TN911.3
- Online First：10 October 2020，
  
  Published：2020
- 稿件说明：
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Differential Chaotic Shift Keying System with Orthogonal Multiuser Noise Reduction[J]. 2020, 54(10): 108-115.
DOI：

Differential Chaotic Shift Keying System with Orthogonal Multiuser Noise Reduction[J]. 2020, 54(10): 108-115. DOI： 10.7652/xjtuxb202010013.

摘要

针对差分混沌移位键控(DCSK)系统传输速率低和误码性能差的缺点

提出一种正交多用户降噪差分混沌键控(OMU-NRDCSK)通信系统。在发送端的参考时隙之后增加了连续的N个信息时隙

并引入希尔伯特变换使得单个信息时隙内可传输2 bit用户信息

利用希尔伯特变换优良的正交特性可消除用户间干扰

从而提升系统的传输速率和误码性能。在接收端

引入滑动平均滤波器对接收信号进行平均操作

降低了噪声方差

从而提升了系统误码性能。推导了OMU-NRDCSK系统在加性高斯白噪声(AWGN)信道和多径瑞利衰落(RFC)信道下的比特误码率公式并进行了仿真实验。仿真结果表明:在相同条件下

与多用户正交差分混沌键控系统相比

OMU-NRDCSK系统的传输速率提升了约50%

误码性能提升了将近3 dB。

Abstract

A differential chaotic shift keying(OMU-NRDCSK)communication system with orthogonal multiuser noise reduction is proposed to improve the low transmission rate and poor bit error performance of the conventional differential chaos shift keying(DCSK)system. N consecutive information time slots are added after the reference time slot at the modulator

and Hilbert transform is introduced to enable the transmission of two user information bits within a single information time slot and to eliminate the interferences between users in the information time slot. A moving average filter is introduced at the demodulator to average the received signal

which helps to reduce the noise variance and to improve system's bit error performance. A theoretical formula of bit error rate(BER)for the proposed system is derived under additive white Gaussian noise(AWGN)channel and multi-path Rayleigh fading(RFC)channel

and simulation experiments are performed. The simulation results and a comparison with ortho

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references

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