Title :
Novel method to reduce the estimation variance of DCSK
Author :
Hu, Liu ; Jing, Zhang Shu ; Bo, Liu Jim ; Chun, Wu Ri ; Ping, Zhang Li
Author_Institution :
Tongji Univ., Shanghai, China
Abstract :
In this paper, we analyze the factors which cause the estimation variance in a DCSK (differential chaos shift keying) telecommunication system implemented with a noise reduction module. There are three main factors in this system: the DCSK signal itself, the additive channel noise and the noise reduction module. To avoid the variance in the DCSK signal and the signal reduction that is caused by additive channel noise, a novel DCSK scheme with a chaotic polyphase sequence (CPS) is presented. Simulation results show that the noise performance of this novel DCSK slightly degrades in contrast with frequency-modulated (FM) DCSK for the estimation variance of the noise reduction scheme. However, this design can be implemented easily
Keywords :
chaos generators; estimation theory; interference suppression; modulation; noise; performance index; sequences; telecommunication channels; DCSK telecommunication system; additive channel noise; chaotic polyphase sequence; differential chaos shift keying; estimation variance reduction; frequency modulation; noise performance degradation; noise reduction module; Additive noise; Additive white noise; Analysis of variance; Chaos; Degradation; Noise reduction; Phase locked loops; Phase modulation; Signal generators; Transmitters;
Conference_Titel :
Intelligent Transportation Systems, 2001. Proceedings. 2001 IEEE
Conference_Location :
Oakland, CA
Print_ISBN :
0-7803-7194-1
DOI :
10.1109/ITSC.2001.948823
