Title :
A Novel Time-Frequency Method of Harmonic Signal Extraction in Chaotic Secure Communication System
Author :
Wang Er-fu ; Wang Dong-qing ; Zhan Yang ; Ma Jing ; Ding Qun
Author_Institution :
Sch. of Electron. Eng., Heilongjiang Univ., Harbin, China
Abstract :
In chaos secure communication system, to separate effectively chaos and harmonic signal is an important way of testing systematic confidential performance. In recent years, the time-frequency analysis theory is more and more mature, effective time-frequency analytical algorithms are emerging constantly. The paper starts with the time-frequency character analysis of the chaos, the noise and the harmonic signal, and then puts forward a new two-step extraction method of time-frequency, aiming to complement each other´s advantages and mutual fusion for wavelet multi-scale decomposition and empirical mode decomposition (EMD). It also discusses the influence of the amplitude, frequency of harmonic signal and noise energy on the extraction performance. Computer simulation verified that the methods have high availability.
Keywords :
chaotic communication; telecommunication security; time-frequency analysis; wavelet transforms; EMD; chaos; chaotic secure communication system; computer simulation; empirical mode decomposition; harmonic signal extraction; harmonic signal frequency; noise energy; systematic confidential performance testing; time-frequency analysis theory; time-frequency character analysis; wavelet multiscale decomposition; Chaotic communication; Harmonic analysis; Power harmonic filters; Signal to noise ratio; Wavelet transforms;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6250-6
DOI :
10.1109/wicom.2011.6038685
