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近年来,基于亿阻器的混沌电路受到国内外学者的广泛关注.然而现阶段的研究,大都采用通过磁控忆阻器和负电导并联构成的有源忆阻器替代蔡氏电路中蔡氏二极管的方法.而采用荷控忆阻器的混沌电路大都同时使用荷控忆阻器与磁控忆阻器构成的五阶双忆阻器混沌电路.该文在蔡氏电路的基础上,采用荷控忆阻器与电感串联的形式构造了一个新的四阶忆阻混沌电路,并提出改进的忆阻器非线性特性曲线,通过数值仿真的方法进行了验证.最后,对这个新的四阶忆阻混沌电路进行动力学特性分析,主要通过李雅普诺夫指数和吸引子在相平面的投影. 相似文献
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设计了一种限幅特性非线性三阶自治混沌保密通信电路系统.该系统利用串联同步三阶自治混沌电路进行信号混沌遮掩保密通信.有用信号隐藏在混沌参数中,混沌复合信号作为传送信号,在发送端和接收端之间传送.利用接收端响应系统与发送端驱动系统达到同步,可无失真地将有用信息信号检出.该方法设计简单,易于实现,并且同步速度快,实现了高质量的信息保密传送,具有很好的可行性. 相似文献
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基于经典蔡氏混沌振荡电路,引入一种双曲余弦函数的新型磁控忆阻器模型,设计含有两个双曲余弦忆阻器的混沌电路系统,讨论了系统平衡点集面的稳定区间.选择不同的忆阻初始值进行数值仿真,通过分岔图与Lyapunov指数谱研究双曲忆阻混沌系统的多稳态特性.结果表明,含双曲函数的双忆阻混沌电路具有复杂的动力学行为,运动轨迹不仅依赖于电路参数,还受电路的初始状态影响,由此产生了不同拓扑结构的混沌吸引子与不同周期运动的多稳态隐藏吸引子共存现象. 相似文献
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该文采用文氏桥振荡器和磁通控制的分段线性忆阻器,设计了一种新的单一参数控制的混沌电路。通过调节控制参数,该系统在忆阻器的非线性作用下,通过倍周期分岔产生了混沌和超混沌现象。利用常规的动力学分析手段研究了电路参数变化时系统的动力学特性,例如平衡点稳定性分析,李雅普诺夫指数谱和分岔图。为了验证电路的正确性,该文采用集成运放和压控开关实现了一个分段线性磁控忆阻器的模拟等效电路,并将该系统应用于提出的混沌电路,Pspice仿真结果与理论分析完全吻合。 相似文献
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本文介绍了HP忆阻器的基本概念及数学模型,该模型可以较好地表示HP忆阻器的非线性掺杂漂移性质,将忆阻器用于蔡氏电路,可以得到基于忆阻器的混沌电路。笔者使用Matlab进行系统级仿真,并简要地进行了动力学分析。建立了忆阻器的Orcad模型,对其进行了仿真实验,其结果与HP实验室相同。我们用Orcad进行器件级仿真,为实际的混沌电路提供基础。该数值仿真和电路仿真结果一致,表明该混沌电路是可行的。 相似文献
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忆阻器是一种拥有记忆功能的电阻,目前忆阻器的研究热点及难点在于新模型的建立以及相关方面的应用。该文提出一种基于双曲正弦函数的新型磁控忆阻器模型,通过分析电压和电流的相轨迹关系,发现其具有典型的忆阻器电压-电流特性曲线。利用新建的忆阻器模型构造新型忆阻混沌系统,通过数值仿真绘出新系统的相轨迹图、分岔图、Lyapunov 指数谱等,分析了不同参数时系统的混沌演化过程。另外,基于电路仿真软件Multisim研制了实验仿真电路, 该电路结构简单、易于实际制作,且仿真实验与理论分析结论十分吻合,证实了提出的忆阻混沌系统电路在物理上是可以实现的。最后,利用新系统混沌序列对图像进行加密,重点分析了加密直方图、相邻像素相关性以及抗攻击能力与密钥敏感性,结果表明新系统对图像密钥及明文都非常敏感,密钥空间较大,新提出的忆阻混沌系统应用于图像加密具有较高的安全性能。 相似文献
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Jen-Fuh Chang Teh-Lu Liao Jun-Juh Yan Hsin-Chieh Chen 《Circuits, Systems, and Signal Processing》2010,29(3):527-538
This paper investigates the synchronization of chaotic systems and its application in secure communication. First, a particle
swarm optimization (PSO)-based proportional -integral (PI) controller is proposed for synchronization of general chaotic systems.
By using the PSO algorithm, optimal control gains in PI controller are derived such that a performance index of integrated
squared error (ISE) is as minimal as possible and synchronization can be achieved. Then a chaotic secure communication system
based on synchronized coupled Lü systems is implemented using basic electronic components. Finally, both simulation results
and the experimental results demonstrate the proposed PSO-based PI scheme’s success in the secure communication application. 相似文献
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Pizolato J.C. Romero M.A. Goncalves Neto L. 《IEEE transactions on circuits and systems. I, Regular papers》2008,55(4):1108-1115
A secure communication system based on the error-feedback synchronization of the electronic model of the particle-in-a-box system is proposed. This circuit allows a robust and simple electronic emulation of the mechanical behavior of the collisions of a particle inside a box, exhibiting rich chaotic behavior. The required nonlinearity to emulate the box walls is implemented in a simple way when compared with other analog electronic chaotic circuits. A master/slave synchronization of two circuits exhibiting a rich chaotic behavior demonstrates the potentiality of this system to secure communication. In this system, binary data stream information modulates the bifurcation parameter of the particle-in-a-box electronic circuit in the transmitter. In the receiver circuit, this parameter is estimated using Pecora-Carroll synchronization and error-feedback synchronization. The performance of the demodulation process is verified through the eye pattern technique applied on the recovered bit stream. During the demodulation process, the error-feedback synchronization presented better performance compared with the Pecora-Carroll synchronization. The application of the particle-in-a-box electronic circuit in a secure communication system is demonstrated. 相似文献
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一种新的图像加密算法研究与应用 总被引:1,自引:4,他引:1
提出了一种新的混沌彩色图像加密算法.首先由Logistic和Cubic-Henon复合混沌映射生成混沌序列,再结合像素值替代和图像位置置乱方法对彩色图像进行加密,并利用"一幅图像一次密钥"的密钥同步方案,实现了一个基于混沌的图像保密通信系统.该算法具有一定的有效性和良好的加密性能. 相似文献
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In recent years, various chaotic systems have been introduced in literature to be used in different branches of science. In the field of secure chaotic communication, more complex chaotic systems are proposed, such as high dimensional (4D, 5D), multi-scroll, surface equilibrium point, to enhance communication security level. In this study, a chaotic system owning logic element is used for increasing the level of security of chaotic communication system, which has not been previously implemented for this purpose in the literature. The used chaotic system includes signum functions, maximum function and absolute operation term. Also, there are analog devices and digital device in the electronic circuit of this chaotic system. These properties increase the complexity of the chaotic system and the security level. Sliding mode control method is preferred for the synchronization part of the secure communication. In this regard, numerical analysis and electronic circuit design of the secure chaotic communication system by using the chaotic system owning logic element have been performed successfully. 相似文献
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从实际网络通信平台出发,利用零动态可逆算法进行信息的加解密,同时提出混沌协议同步技术来保证通信双方的混沌信号严格同步,从而设计并实现了一个混沌语音保密通信系统,具有数据通信的实时性和保密性并举,最后给出了系统通信测试结果. 相似文献
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混沌协议同步技术研究与应用 总被引:1,自引:1,他引:0
首次从网络通信协议的思路出发,在混沌脉冲同步的启发下,提出了一种新型的混沌协议同步技术,并加以改进,从而解决了混沌数字保密通信的关键技术难题;然后应用混沌协议同步技术,构建成了一个基于协议同步的网络混沌语音保密通信系统,验证了此技术的可行性。 相似文献
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Zhiguo Shi Songjie Bi Hongtao Zhang Rongxing Lu Xuemin Shen 《Wireless Communications and Mobile Computing》2015,15(10):1456-1470
In this paper, we propose a synchronization scheme based on an improved auxiliary particle filter (IAPF) for chaotic Colpitts circuit and conduct an experimental study on the synchronization performance with application to secure communications. Specifically, with the synchronization scheme, when the chaotic signals generated by an analog Colpitts circuit are transmitted through a nonideal channel, the distorted signals are processed digitally by the novelly designed IAPF at the receiver, in order to obtain the synchronized signals of the transmitter circuit. Experimental results indicate that synchronization can be achieved over both the additive white Gaussian noise channel and the multipath fading channel with low signal‐to‐noise ratio, even if there exist severe circuit parameter mismatches between the transmitter and the receiver. Furthermore, a chaos‐masking secure communication system is constructed and verified over both the additive white Gaussian noise channel and the multipath fading channel, and the bit error rate is evaluated versus different signal‐to‐noise ratios and symbol periods. It is shown that the achievable bit error rate can reach the order of magnitude of 10 − 4 without error correction coding techniques. In addition, security analysis demonstrates that the proposed chaotic secure communication system is resistant to the brute‐force attack. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献