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arXiv 0806.4291nlin.CD
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混沌带通滤波器:同步混沌系统的线性响应

Chaos Pass Filter: Linear Response of Synchronized Chaotic Systems

Wolfgang Kinzel, Johannes Kestler, Ido Kanter

摘要:

在混沌同步通信的背景下,研究了具有延迟耦合和反馈的同步混沌单元对外部小扰动的线性响应。对于迭代混沌映射,数值计算了距离的分布,并在某些特殊情况下,解析计算。根据模型参数,该分布具有幂律尾部,导致同步区域中距离的发散时刻。相应的线性方程由于扰动和混沌而具有乘性和加性噪声。对小谐波扰动的响应显示与耦合和反馈延迟时间相关的共振。对于来自二进制消息的扰动,计算误码率。误比特率与横向李雅普诺夫指数无关,并且当向发送信号添加附加噪声时可以降低误比特率。在某些特殊情况下,误码率随耦合强度的变化具有魔鬼楼梯的结构,与迭代函数系统有关。最后,通过单向耦合和双向耦合的比较,讨论了通信的安全性。

英文摘要:

The linear response of synchronized chaotic units with delayed couplings and feedback to small external perturbations is investigated in the context of communication with chaos synchronization. For iterated chaotic maps, the distribution of distances is calculated numerically and, for some special cases, analytically as well. Depending on model parameters, this distribution has power law tails leading to diverging moments of distances in the region of synchronization. The corresponding linear equations have multiplicative and additive noise due to perturbations and chaos. The response to small harmonic perturbations shows resonances related to coupling and feedback delay times. For perturbation from a binary message the bit error rate is calculated. The bit error rate is not related to the transverse Lyapunov exponents, and it can be reduced when additional noise is added to the transmitted signal. For some special cases, the bit error rate as a function of coupling strength has the structure of a devil's staircase, related to an iterated function system. Finally, the security of communication is discussed by comparing uni- and bi-directional couplings.

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