一种改进的混沌掩盖通信方法

Improved secure communication method based on chaotic masking

提出了一种适合较大功率信息信号的混沌掩盖通信方法。在该方法中,注入到发射系统的信号是信息信号与一个自适应控制器的误差。同时,将信息信号直接叠加在发射的混沌信号中驱动接收系统。在接收端,另一个自适应控制器维持收发系统的混沌同步并恢复出信息信号。由于同步误差与信息信号无关,从而在增大信息信号功率的同时允许其频率与混沌信号的频率相当。理论分析和数值模拟的结果表明,该方法不但增强了低维混沌系统的通信保密性,而且极大地改进了接收端的信噪比。

Secure communications method for higher power information signal based on chaotic masking is proposed. In this method, the information signal and error from an adaptive controller are injected into transmitting system. At the same time, the information is directly added to the chaotic signal in transmission to drive the receiving system. In the receiver, another adaptive controller maintains the chaotic synchronization of transmitting and receiving systems and simultaneously recovers information signal. Because the synchronization error is independent of information signal, the power and frequency of information signal can be equivalent to that of chaotic signal. The results of theoretic analysis and numerical simulation show that the presented method not only enhances the degree of security of low-dimensional chaotic systems but also significantly improves the signal-to-noise ratio at the receiving end.