The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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Performance of Cooperative Networks with Mixed Relaying Protocols in Railway Environments

철도환경에서 혼합 중계 프로토콜을 이용한 협력 네트워크의 성능

  • Cho, Woong (Dept. of Computer System Engineering, Jungwon University)
  • 조웅 (중원대학교 컴퓨터시스템공학과)
  • Received : 2016.03.08
  • Accepted : 2016.03.24
  • Published : 2016.03.31
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Abstract

Cooperative networks enhance the overall communication performance by combining signals from relay nodes and direct signal. In this paper, we analyze the performance of cooperative communication systems which use mixed relaying protocols. By assuming several relay nodes exist between the source node and destination node, we consider the systems use not a single relaying protocol but both decode-and-forward and amplify-and-forward protocols randomly. We analyze the effect of each relying protocol for the overall system performance, and also consider the performance depending on the relay location. Differential modulation scheme which demodulates signal without channel state information is adopted where it can be applicable fast varying channel such as railway environments.

협력 네트워크는 여러 중계기를 통해서 수신되는 신호 및 직접파 신호를 결합하여 복조함으로써 전체 통신성능을 향상시킨다. 본 논문에서는 철도환경에서 혼합 중계 프로토콜을 이용하는 협력통신 시스템의 성능을 분석한다. 송신기와 수신기 사이에 여러 개의 중계기 사용을 가정하고, 각 중계기들은 하나의 정해진 중계 프로토콜이 아닌 복조 후 전송 혹은 증폭 후 전송 프로토콜을 이용하는 경우를 고려한다. 두 가지 중계 프로토콜이 존재하는 경우 각 중계 프로토콜이 전체 시스템의 성능에 미치는 영향을 분석하고 중계기 위치에 따른 성능에 대해서도 고려한다. 변조방식은 철도환경과 같은 빠른 채널변화에서도 채널상태정보의 이용 없이 신호의 복조가 가능한 차등변조 방식을 적용한다.

Keywords

References

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