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

作　　者：贾雅琼 俞斌 JIA Yaqiong;YU Bin(Department of Electronics and Information Engineering,Hunan Institute of Technology,Hengyang,Hunan 421002,China)

机构地区：[1]湖南工学院电气与信息工程学院,湖南衡阳421002

出　　处：《计算物理》2022年第4期491-497,共7页Chinese Journal of Computational Physics

基　　金：湖南省自然科学基金项目(2018JJ4029,2019JJ60024,2021JJ50081);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)资助

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。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.

关 键 词：混沌保密通信 差分混沌键控 可重复混沌扩频序列 

分 类 号：TN918[电子电信—通信与信息系统]