一个大范围混沌系统及其在DCSK中的应用  

Ultra-large range chaotic system and its application in DCSK

作　　者：鲜永菊[1] 谢东明 付明明 黎金龙 XIAN Yongju;XIE Dongming;FU Mingming;LI Jinlong(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学光电工程学院,重庆400065

出　　处：《现代电子技术》2022年第14期74-78,共5页Modern Electronics Technique

基　　金：国家自然科学基金项目(61602073)。

摘　　要：针对在差分混沌移位键控(DCSK)中采用混沌系统时,混沌的参数敏感特性会影响安全保密通信能力的问题,文中提出一种能在超大参数范围内保持混沌特性的混沌系统。首先,分析能在超大参数范围内保持混沌特性的混沌系统的Lyapunov指数、分岔图;其次,进行基于DCSK的混沌系统通信研究,验证当参数不稳定时,超大参数范围混沌系统在DCSK中的稳定性;最后,通过Matlab软件平台进行仿真实验,并在仿真过程中引入高斯噪声作为干扰。结果表明:当参数在不同的固定值时,文中混沌系统误比特率性能相同,且与简单双曲正弦混沌系统相比,误比特率性能更优;当参数不稳定时,对比参数范围小的混沌系统,该混沌系统能保证DCSK的保密性能,同时误比特率性能稳定且更优。In allusion to the fact that the parameter sensitivity of chaos may affect the capability of secure and confidential communication when a chaotic system is applied in differential chaos shift keying(DCSK),a chaotic system which can keep the chaotic characteristics within an ultra-large parameter range is proposed.The Lyapunov exponent and bifurcation diagram of this chaotic system are analyzed.The communication studies on the chaotic system based on DCSK are carried out to verify the stability of chaotic system with ultra-large parameter range in DCSK in the situation of the unstable parameters.The simulation experiment was conducted on the Matlab software platform,and Gaussian noise was introduced as interference in the simulation process.The results show that when the parameters are at different fixed values,the BER(bit error rate)performance of the chaotic system is the same,and its BER performance is better than that of the simple hyperbolic sinusoidal chaotic system;when the parameters are unstable,the chaotic system can ensure DCSK′s confidential performance,and the BER performance is much stable and more superior in comparison with chaotic system with small parameter range.

关 键 词：差分混沌移位键控 混沌系统 误比特率 参数调整 保密通信 仿真验证 

分 类 号：TN919-34[电子电信—通信与信息系统] TP311[电子电信—信息与通信工程]