Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Exact Bit Error Rate Analysis of Partial Relay Selection in Dual-Hop Decode-and-Forward Relaying Systems over Rayleigh Fading Channels

레일레이 페이딩 채널을 고려한 듀얼 홉 디코딩 후 전달 중계 시스템에서 부분 중계 노드 선택 기법의 정확한 비트 오차율 분석

  • Lee, Sangjun (Department of Electrical, Electronic and Control Engineering, Hankyong National University) ;
  • Lee, In-Ho (Department of Electrical, Electronic and Control Engineering, Hankyong National University)
  • Received : 2013.09.17
  • Accepted : 2013.10.30
  • Published : 2014.01.31
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Abstract

The conventional best relay selection based on all the channel information for the first and second hops in dual-hop systems has a large consumption of resources for channel feedback. In this paper, we analyze the average bit error rate for partial relay selection based on the channel information only for the first hop in dual-hop decode-and-forward relaying systems, where we assume independent Rayleigh fading channels. In particular, we provide an exact and closed-form expression for the average bit error rate of M-ary QAM. Also, through numerical investigation, the performance of the partial relay selection is compared with the performance of the best relay selection, and the performance is evaluated for different numbers of relays and various average channel power ratios for the first and second hops.

듀얼 홉 시스템에서 기존의 두 홉에 대한 채널 정보를 이용하여 가장 좋은 성능을 나타내는 중계 노드 선택 기법은 채널 피드백을 위한 자원의 소모가 크다. 본 논문에서는 듀얼 홉 디코딩 후 전달 중계 시스템에서 첫 번째 홉에 대한 채널 정보만을 필요로 하는 부분 중계 노드 선택 기법을 이용하여 정확한 평균 비트 오차율을 분석한다. 이 때, 독립적인 레일레이 페이딩 채널을 가정하여 M-ary QAM에 대한 정확한 비트 오차율의 표현식을 유도한다. 또한, 수치적 결과를 통해 두 홉에 대한 채널 정보를 이용하여 가장 좋은 성능을 나타내는 중계 노드 선택 기법과 부분 중계 노드 선택 기법에 대한 성능을 비교한다. 여기서, 중계 노드의 수와 첫 번째 홉과 두 번째 홉 간 평균 채널 전력비를 다양하게 가정하여 평균 비트 오차율을 분석한다.

Keywords

References

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