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arXiv 1301.6929nlin.CD
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混沌通滤波器:同步混沌系统的线性响应

Chaos Pass Filter: Linear Response of Synchronized Chaotic Systems

Steffen Zeeb, Johannes Kestler, Ido Kanter, Wolfgang Kinzel

摘要:

研究了同步时滞混沌系统对外部小扰动的线性响应,研究了迭代映射的混沌通滤波现象。距离的分布,即,由于传输信号上的外部扰动而导致的两个同步混沌单元之间的偏差被用作线性响应的度量。它是数值计算,并在某些特殊情况下,解析。根据模型参数,该分布在同步区域中具有幂律尾部,导致距离的发散时刻。这是由于混沌和外部扰动导致的相应线性方程中的乘性和加性噪声的结果。线性响应也可以通过干扰同步系统的传输二进制消息的误码率来量化。误码率由距离分布上的积分给出,并通过解析和数值计算。它在同步区域表现出复杂的非单调行为。对于特殊情况下的分布的距离有一个分形结构,导致魔鬼的楼梯的误比特率作为耦合强度的函数。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。三个单元的双向耦合链可以完全滤除扰动。因此,二阶矩和误码率变为零。

英文摘要:

The linear response of synchronized time-delayed chaotic systems to small external perturbations, i.e., the phenomenon of chaos pass filter, is investigated for iterated maps. The distribution of distances, i.e., the deviations between two synchronized chaotic units due to external perturbations on the transfered signal, is used as a measure of the linear response. It is calculated numerically and, for some special cases, analytically. Depending on the model parameters this distribution has power law tails in the region of synchronization leading to diverging moments of distances. This is a consequence of multiplicative and additive noise in the corresponding linear equations due to chaos and external perturbations. The linear response can also be quantified by the bit error rate of a transmitted binary message which perturbs the synchronized system. The bit error rate is given by an integral over the distribution of distances and is calculated analytically and numerically. It displays a complex nonmonotonic behavior in the region of synchronization. For special cases the distribution of distances has a fractal structure leading to a devil's staircase for the bit error rate as a function of coupling strength. The response to small harmonic perturbations shows resonances related to coupling and feedback delay times. A bi-directionally coupled chain of three units can completely filtered out the perturbation. Thus the second moment and the bit error rate become zero.

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