多用户降噪差分混沌键控通信方案

张刚; 陈和祥; 张天骐

doi:10.11999/JEIT171173

多用户降噪差分混沌键控通信方案

doi: 10.11999/JEIT171173

重庆邮电大学信号与信息处理重庆市重点实验室重庆 400065

基金项目: 国家自然科学基金项目(61771085, 61671095, 61371164)，信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003)，重庆市教育委员会科研项目(KJ1600427, KJ1600429)

详细信息

作者简介:
张刚：男，1976年生，博士，副教授，研究方向为混沌同步、混沌保密通信

陈和祥：男，1993年生，硕士生，研究方向为混沌保密通信

张天骐：男，1971年生，博士后，教授，研究方向为扩频信号的盲处理、神经网络实现以及信号的同步处理

通讯作者:
陈和祥　694368038@qq.com

中图分类号: TN918.6
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-14
- 修回日期: 2018-11-21
- 网络出版日期: 2018-11-26
- 刊出日期: 2019-02-01

A Multiuser Noise Reduction Differential Chaos Shift Keying System

Chongqing Key Laboratory of Signal and Information Processing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Funds: The National Natural Science Foundation of China (61771085, 61671095, 61371164), The Project of Key Laboratory of Signal and Information Processing of Chongqing (CSTC2009CA2003), The Research Project of Chongqing Educational Commission (KJ1600427, KJ1600429)

摘要

摘要:
传统多用户差分混沌键控主要缺点是误码率差，该文提出一种多用户降噪差分混沌键控(MU-NRDCSK)通信方案。在发射端，发送M/P长度混沌序列，复制P次后作为参考信号，所有用户共用同一参考信号，信息信号延迟不同的时间来区分用户。在接收端，将接收到的信号通过滑动平均滤波器平均，再与其不同时间延迟后的信号进行相关。该方案通过降低噪声项的方差来提高系统误码性能。文中推导了该方案在加性高斯白噪声(AWGN)信道和Rayleigh信道下的理论误码率公式并进行了蒙特卡洛仿真。理论分析和仿真结果表明，理论公式与仿真结果能较好地吻合，MU-NRDCSK方案能较好地提高系统误码性能，在混沌通信领域具有很好的发展前景与研究价值。
- 混沌通信 /
- 多用户 /
- 滑动平均滤波器 /
- 降噪 /
- 比特误码率
Abstract:
One of the major drawbacks of the conventional Multiuser Differential Chaos Shift Keying is the poor Bit Error Rate (BER), a MultiUser Noise Reduction Differential Chaos Shift Keying (MU-NRDCSK) system is proposed. At the transmitter, M/P chaotic samples are transmitted and then duplicated P times as a reference signal, all users share the same reference signal, and information signals are delayed by different times to distinguish different users. At the receiver, the received signal is averaged by a moving average filter, and then the resultant filtered signal is correlated to different time-delated replica. The scheme can enhance the performance of BER by reducing the variance of noise terms in the system. The theoretical BER formula of this new scheme is derived in Additive White Gaussian Noise (AWGN) channel and Rayleigh channel. Theoretical analysis and the simulation results show that the theoretical formula and the simulation result are in good agreement. The MU-NRDCSK scheme can enhance the performance of BER better and has good development prospects and research value in the chaotic communication field.
- Chaotic communication /
- Multiuser /
- Moving average filter /
- Noise reduction /
- Bit Error Rate (BER)

HTML全文

图 1 MU-NRDCSK系统传输信号的帧结构

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图 2 MU-NRDCSK系统发射端结构

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图 3 MU-NRDCSK系统接收端结构图

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图 4 两径Rayleigh衰落信道

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图 5 系统${R_D}$和${S_E}$变化曲线

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图 6 不同信噪比条件下系统误码性能随扩频因子变化曲线

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图 7 误码率随用户数在不同信道下变化曲线

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图 8 MU-NRDCSK, HE-DCSK, I-DCSK系统误码性能比较曲线

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