The Journal of the Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회논문지)

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Performance Comparison of Relay Selection Methods for Incremental Cooperative Relaying Systems with Spatially Random Relay

랜덤한 릴레이를 갖는 추가 기회전송 협동 릴레이 시스템의 릴레이 선택법에 따른 성능비교

  • Kim, Nam-Soo (Dept. of Electronic Engineering, Cheongju University)
  • Received : 2016.03.22
  • Accepted : 2016.06.10
  • Published : 2016.06.30
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Abstract

Cooperative relaying systems have been studied actively to improve the system performance effectively in wireless fading channels. Most of the cooperative relay studies are assumed fixed relay, recently the performance analysis of the cooperative relaying systems with spatially random relays considering the practical mobile environment are introduced. However the comparative studies for relay selection methods of incremental cooperative relay systems, the performance of which is influenced by the selection methods, have not been studied. Therefore we derive the performance of the system which has MRC(Maximal-ratio combining) with Max SNR(signal-to-noise ratio) selection or Max-min SNR selection, respectively. And the outage performances of the system with Max or Max-min selection method are compared for different transmit power allocation to the source and to the relays. The analytical results serve as useful tools for relay selection and power allocation to transmit nodes for opportunistic incremental relaying systems.

무선 페이딩 채널에서 시스템의 성능 저하를 효과적으로 개선하기 위하여 협동 릴레이 시스템에 관한 연구가 활발히 진행되고 있다. 그동안의 연구는 고정된 릴레이를 가정하였는데, 최근에는 실제 이동통신 환경을 고려하여 공간적으로 랜덤하게 분포된 릴레이를 갖는 협동 릴레이 시스템의 연구가 시작되고 있다. 특히 통신 자원의 효율이 높은 추가 기회전송 협동 릴레이 시스템에서는 릴레이를 선택하는 방법에 따라서 시스템의 성능이 변화하는데, 이에 대한 비교 연구는 발표되지 않았다. 따라서 본 논문에서는 최대 SNR 선택법과 최대-최소 SNR 선택법을 대상으로 최대비 결합을 사용한 추가 기회전송 협동 릴레이 시스템의 성능을 유도하였고, 송신전력이 소스와 릴레이로 배분되었을 때의 오수신율을 비교하였다. 본 논문의 해석적 결과는 이동통신 시스템에 기회전송 증가 릴레이 시스템을 도입하였을 경우 릴레이를 선택하고 송신 전력을 배분하는데 이론적 근거로 활용할 수 있을 것으로 생각된다.

Keywords

References

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