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针对差分混沌键控(DCSK)的保密性低,数据传输速率不高等缺点,这里设计并研究了一种新的混沌键控调制方式—调频相关延迟键控(FM-CDSK)通信方案,该方案同时兼具CDSK和FM-DCSK的优点。通过仿真分析验证了该系统在数据传输速率和保密性等方面较DCSK和CDSK都有所提高,传输速率更是比原有键控方式提高了2倍,并且利用该混沌调制方式很好的实现了图像信号的保密传输,验证了该系统在数字保密通信中的可实现性。
Aiming at the low confidentiality and low data transmission rate of DCSK, a new chaos-keying modulation scheme called FM-CDSK communication scheme is designed and studied. At the same time both the advantages of CDSK and FM-DCSK. The simulation results show that the system has better performance than DCSK and CDSK in terms of data transmission rate and confidentiality, and the transmission rate is increased by two times than that of the original keying. Moreover, the system is well implemented by using the chaotic modulation The image signal is transmitted confidentially, which verifies the realization of the system in digital secure communication.