基于盲分离的混沌保密通信技术  

Chaotic secret communication technology based on blind separation

作　　者：李雪霞[1] 冯久超[1] 

机构地区：[1]西南大学电子信息工程学院

出　　处：《吉林大学学报（工学版）》2007年第6期1431-1435,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金资助项目(60572025);教育部重点科研项目(105137);教育部新世纪优秀人才支持计划项目(NCET-04-0813);广东省自然科学基金资助项目(04205783;05006506;07006496)

摘　　要：针对实现欠定条件下线性混合的混沌信号的盲分离非常困难的问题,提出一种保密通信方案。在发送端利用密码序列对混沌信号加密并构造出欠定的盲分离模型;在接收端先用密码序列将欠定问题变为正定问题,最后利用盲分离技术解密和重构出源混沌信号。分析和仿真结果表明,该保密通信系统保密性强和精度高,并在强信道噪声干扰条件下依然有效。Based on the fact that realizing blind separation of linearly mixed chaotic signals under the underdetermined conditions is intractable in blind source separation （BSS）, a chaotic secret communication scheme is proposed in this paper. At the transmitter, a key series is used to encrypt chaotic source signals and construct an underdetermined model; at the receiver, the key series is first used to transform the underdetermined problem into the positive definite one, and the blind separation technology is then used to decrypt and reconstruct the source chaotic signals. Both theoretical analysis and numerical simulations demonstrate that the proposed system is of better security and high precision for recovered source signals even when channel noise is very high.

关 键 词：通信技术 保密通信 盲分离 混沌 欠定问题 

分 类 号：TN918.8[电子电信—通信与信息系统]