한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

Relay-assisted Multiple Access Channel Protocol for Cooperative Diversity

  • 김동현 (서울대학교 전기컴퓨터공학부 이동통신연구실) ;
  • 김기일 (삼성전자 종합기술원(SAIT) 커뮤니케이션랩) ;
  • 이광복 (서울대학교 전기컴퓨터공학부 뉴미디어통신공동연구소(INMC))
  • 발행 : 2009.01.31
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초록

Cooperative diversity is a novel technique to improve diversity gains, capacity gains, and energy saving. This technique involves multiple terminals sharing resources in order to build a virtual antenna array in a distributed fashion. In this paper, we propose a multi-user cooperative diversity protocol called Relay-assisted Multiple Access Channel(R-MAC) that allows multiple source terminals to transmit their signals simultaneously and the relay terminal forwards the aggregated signal received from the source terminals to the destination terminal. The proposed protocol converts the distributed antenna channels into an effective MIMO channel by exploiting a relay, increasing both diversity gain and system throughput. We investigate the performance of the proposed protocol in terms of outage probability and diversity-multiplexing tradeoff where we assume block fading channel environment. Our simulation results show that the proposed protocol outperforms direct transmission in the high spectral efficiency regime where the conventional cooperative diversity protocols cannot outperform direct transmission.

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참고문헌

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