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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Long-term Fading Statistics-Based Power Allocation for Fixed Decode-and-Forward Relays

  • 공형윤 (울산대학교 전기전자정보시스템 공학부 무선통신 연구실) ;
  • 보 뉘웬 �o 바오 (울산대학교 전기전자정보시스템 공학부 무선통신 연구실)
  • Published : 2008.12.31
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Abstract

This paper considers 2-hop wireless cooperative communications networks with fixed decode-and-forward relays. Specifically, we first derive the closed-form BER expression for theoretically evaluating the end-to-end performance of these networks. Then, based on this expression and long-tenn fading statistics, we propose a power allocation method for source and relay. Such a method brings about multiple advantages in tenn of spectral efficiency and implementation complexity over other power allocation methods based on instantaneous fading statistics. A variety of numerical results reveal that the cooperative communications scheme with the proposed power allocation significantly outperforms that with the equal power allocation and the direct transmission scheme for any position of the relay subject to the same total transmit power constraint.

Keywords

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