Abstract
In the purpose of improving the complexity and the security of chaotic communication system, a novel electro-optical intensity chaotic system using electrical mutual injection with nonlinear transmission function is proposed. The electro-optical intensity chaotic system consisting of two delay feedback branches in a serial configuration extends keys space scale. The dynamic characteristics of the proposed system are investigated by means of the bifurcation diagram, the largest Lyapunov exponents, and the permutation entropy, and the security are also analyzed through the autocorrelation function and the delayed mutual information. The simulation results show that the proposed system can acquire higher complexity and the better security, compared with the recent ones. The scheme allows the system to enter chaos with a low gain and the time-delay concealed effectively due to a nonlinear transmission function. Besides, the communication synchronization on basis of the proposed system is discussed. It comes to a conclusion that the proposed chaotic system has potential applications in secure communications.
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