基于重复混沌扩频序列的差分混沌键控系统

doi:10.19596/j.cnki.1001-246x.8431

计算物理 ›› 2022, Vol. 39 ›› Issue (4): 491-497.DOI: 10.19596/j.cnki.1001-246x.8431

基于重复混沌扩频序列的差分混沌键控系统

贾雅琼(), 俞斌

湖南工学院电气与信息工程学院, 湖南衡阳 421002

收稿日期:2021-08-05 出版日期:2022-07-25 发布日期:2022-11-17
作者简介:
贾雅琼(1982-), 女, 副教授, 博士, 主要研究方向为混沌保密通信, E-mail: gliet_99021602@163.com
基金资助:
湖南省自然科学基金项目(2018JJ4029); 湖南省自然科学基金项目(2019JJ60024); 湖南省自然科学基金项目(2021JJ50081); 湖南省科技厅重点项目(2017GK2204); 湖南省教育厅重点项目(17A050); 湖南省教育厅创新平台开放基金项目(20K041)

Differential Chaos Shift Keying Secure Communication System Based on Repeated Chaotic Spreading Sequence

Ya-qiong JIA(), Bin YU

Department of Electronics and Information Engineering, Hunan Institute of Technology, Hengyang, Hunan 421002, China

Received:2021-08-05 Online:2022-07-25 Published:2022-11-17

摘要/Abstract

摘要：

提出一种基于可重复混沌扩频序列的差分混沌键控保密通信系统, 并对该系统的误码率进行分析。通过复制差分混沌键控调制信号的参考信号产生重复的混沌扩频序列, 再和经串并转换后的部分数据流相乘, 其余并行数据流按照传统差分混沌键控进行调制, 两部分信号相加后发送到信道中进行传输。在接收端进行相关解调恢复出原信息。理论分析和仿真结果表明: 在多径衰落信道下, 该系统的误码率低于DCSK、CDSK和CD-DCSK系统, 且扩频因子越小, 误码率越低。信道中叠加服从高斯分布噪声时的系统误码率相比叠加服从瑞利分布噪声时的小。

关键词: 混沌保密通信, 差分混沌键控, 可重复混沌扩频序列

Abstract:

A kind of differential chaos keying communication system was presented based on repeated chaotic spreading sequence(RCSS). Bit error rate(BER) performance is theortically analyzed and then verified with numerical simulations. In the system, a repeated chaotic spreading sequence is produced by copying the reference sequence of the DCSK-modulated signal, and part of the parallel bit streams are multipled with this RSS. The resulting signals are then conveyed into the channel. Theoretical analysis and simulation results show that BER performance of the system is better than DCSK, CDSK and CD-DCSK. The system performs better as the spreading factor reduces. BER performance over an AWGN channel is better than aht over a Rayleigh channel.

Key words: chaos secure communication, differential chaos shift keying, repeated chaotic spreading sequence

贾雅琼, 俞斌. 基于重复混沌扩频序列的差分混沌键控系统[J]. 计算物理, 2022, 39(4): 491-497.

Ya-qiong JIA, Bin YU. Differential Chaos Shift Keying Secure Communication System Based on Repeated Chaotic Spreading Sequence[J]. Chinese Journal of Computational Physics, 2022, 39(4): 491-497.

图/表 7

图1 RCSS-DCSK混沌保密通信系统(a)发送端；(b)信道模型；(c)接收端

Fig.1 Structure of the RCSS-DCSK chaotic secrecy communication system (a) transmitter; (b) channel model; (c) receiver

图2 发送端信号示意图

Fig.2 Illustration of signals in the transmitter

图3 混沌序列发生器

Fig.3 A chaotic sequence generator

图4 二阶Chebysev混沌序列

Fig.4 A Chebysev chaotic sequence of order 2

图5 β = 30时各系统的误码率性能

Fig.5 BER performance of different systems with β = 30

图6 不同扩频因子下不同系统的误码率性能

Fig.6 BER performance of systems with different spreading factors

图7 不同噪声分布下，RCSS-DCSK系统误码率性能

Fig.7 BER performance for RCSS-DCSK system with different noise distributions

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基于重复混沌扩频序列的差分混沌键控系统

Differential Chaos Shift Keying Secure Communication System Based on Repeated Chaotic Spreading Sequence

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