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Digital Chaotic Communication System Based on CDSK Modulation

CDSK 방식의 디지털 카오스 통신 시스템

  • Received : 2013.02.26
  • Accepted : 2013.06.05
  • Published : 2013.06.30

Abstract

Recently, interest for wireless communication technology with improved security and low eavesdropping probability is increasing rapidly recognizing that information security is an important. Chaos signal can be used encode information efficiently due to irregular phenomena. Chaotic signal is very sensitive to the initial condition. Chaos signal is difficult to detect the signal if you do not know the initial conditions. Also, chaotic signal has robustness to multipath interference. In this paper, we evaluate the performance of correlation delay shift keying (CDSK) modulation with different chaotic map such as Tent map, Logistic map, Henon map, and Bernoulli shift map. Also, we analyze the BER performance depending on the selection of spreading factor (SF) in CDSK. Through the theoretical analyses and simulations, it is confirmed that Henon map has better BER performance than the other three chaotic maps when spreading factor is 70.

최근 정보 보안이 중요시됨에 따라서 향상된 보안성과 낮은 도청 확률을 가지는 무선 통신 기술에 대한 관심이 급격히 증가하고 있다. 카오스 신호는 불규칙한 현상으로 인하여 정보를 효율적으로 부호화 하는데 적용할 수 있다. 카오스 신호는 초기 조건에 매우 민감하며 초기 조건을 모른다면 신호의 감지가 어렵다는 단점을 가지고 있지만 다중 경로 간섭에 강한 장점을 가진다. 본 논문에서는 디지털 카오스 변조 방식인 CDSK 방식에서 여러 가지 카오스 맵을 적용하여 수신 성능을 평가한다. 또한, CDSK 방식에서 확산인자 (Spreading factor)의 변화에 따른 수신 BER 성능을 분석한다. 시뮬레이션 결과, Hennon map을 사용할 경우 다른 Chaotic map들 보다 훨씬 좋은 수신 성능을 얻을 수 있었으며, 확산인자가 70에서 가장 좋은 수신 BER 성능을 얻는 것을 확인하였다.

Keywords

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