A new chaotic communication scheme based on adaptive synchronization.
A new chaotic communication scheme based on adaptive synchronization.
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作者：
Xiang-Jun Wu
提出了一种利用两个统一混沌系统的自适应同步技术实现混沌通信的新方案。与现有的保密通信方法不同，它将传输信号调制成混沌系统的参数。自适应同步技术被用来同步两个相同的混沌系统嵌入在发送器和接收器。假设接收机系统的参数是未知的。基于李雅普诺夫稳定性理论，设计了一种自适应控制律，使两个参数未知的统一混沌系统的状态渐近同步，从而辨识出接收系统的参数。然后，在接收机中的原始信息信号的恢复成功地实现了估计的参数的基础上。注意到恢复信息信号所需的时间和恢复信号的精度非常敏感地取决于信息信号的频率。数值结果验证了该方法的有效性。
A new chaotic communication scheme using adaptive synchronization technique of two unified chaotic systems is proposed. Different from the existing secure communication methods, the transmitted signal is modulated into the parameter of chaotic systems. The adaptive synchronization technique is used to synchronize two identical chaotic systems embedded in the transmitter and the receiver. It is assumed that the parameter of the receiver system is unknown. Based on the Lyapunov stability theory, an adaptive control law is derived to make the states of two identical unified chaotic systems with unknown system parameters asymptotically synchronized; thus the parameter of the receiver system is identified. Then the recovery of the original information signal in the receiver is successfully achieved on the basis of the estimated parameter. It is noticed that the time required for recovering the information signal and the accuracy of the recovered signal very sensitively depends on the frequency of the information signal. Numerical results have verified the effectiveness of the proposed scheme.