Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance Evaluation of a Novel Chaos Transceiver for the High Level Modulation

고레벨 변조를 위한 새로운 카오스 송수신기의 성능 평가

  • Lee, Jun-Hyun (Department of Electronic Engineering, Chungbuk National University) ;
  • Ryu, Heung-Gyoon (Department of Electronic Engineering, Chungbuk National University)
  • Received : 2013.09.06
  • Published : 2014.01.25
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Abstract

Security of chaos communication system that has characteristic of sensitive initial conditions is superior to digital communication systems, but BER(Bit Error Rate) performance is evaluatied badly. So, studies in order to improve the BER performance is important. existing studies, BER performance of proposed chaos transceiver is possible to improve than the CDSK(Correlation Delay Shift Keying) system because it has characteristic that has very few addition elements like noise signal except for the desired signal. Chaos communication system has many symbols because it spreads according to characteristic of chaos map. Therefore, study that can have the good data rate in chaos communication system is required. Information bits of existing chaos modulation system are modulated as -1 and 1 on the basis of BPSK system. However, instead of BPSK system, if chaos communication system is applied high level modulation systems such as QPSK system and 16QAM system, it is possible to have good data rate because more data are transmitted at a time. In the paper, when QPSK system and 16QAM system are applied to proposed chaos transceiver in existing study, we evaluate the SER(Symbol Error Rate) performance and compare the each performance. Also, when QPSK system and 16QAM system are applied to proposed chaos transceiver, we evaluate the anti-jamming performance of proposed system.

초기조건에 민감한 특징을 가지는 카오스 통신 시스템은 보안성이 디지털 통신 시스템보다 우수하게 평가되지만 BER 성능은 나쁘게 평가되기 때문에 BER(Bit Error Rate) 성능을 향상시키는 연구가 중요하다. 이전 연구에서 제안한 카오스 송수신기는 원하는 신호에 잡음과 같이 더해지는 요소가 매우 적기 때문에 기존 CDSK(Correlation Delay Shift Keying) 방식보다 BER 성능이 굉장히 많이 향상된다. 카오스 통신 시스템은 카오스 맵 특성에 따라 정보 신호를 확산시키고 전송하기 때문에 전송 심볼의 수가 많다. 따라서 카오스 통신 시스템의 데이터 전송 속도를 좋게 하는 연구가 필요하다. 기존의 카오스 변조 방식은 BPSK 방식을 기반으로 정보 신호를 -1과 1로 변조시킨다. 하지만 BPSK 방식 대신에 QPSK나 QAM과 같은 고레벨 변조 방식을 기반으로 한다면 한 번에 더 많은 데이터를 전송할 수 있기 때문에 카오스 통신 시스템의 데이터 전송 속도를 좋게 만드는 것이 가능하다. 본 논문에서는 이전 연구에서 제안한 카오스 송수신기를 사용하며 이 시스템에 QPSK와 16QAM을 적용했을 때, SER(Symbol Error Rate) 성능을 평가하고 각 성능을 비교한다. 또한, 제안한 카오스 송수신기에서 정보신호를 QPSK와 16QAM을 기반으로 변조시켰을 때, 제안한 카오스 송수신기가 항재밍 성능을 갖는지 평가한다.

Keywords

References

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