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Power Allocation Strategy for Soft-Decision-and-Forward Cooperative Communication System  

Song, Kyoung-Young (서울대학교 전기.컴퓨터 공학부 및 뉴미디어통신공동연구소)
Kim, Jae-Hong (서울대학교 전기.컴퓨터 공학부 및 뉴미디어통신공동연구소)
No, Jong-Seon (서울대학교 전기.컴퓨터 공학부 및 뉴미디어통신공동연구소)
Chung, Ha-Bong (홍익대학교 전자전기공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.1C, 2010 , pp. 1-7 More about this Journal
Abstract
In this paper, the performance of the soft-decision-and-forward (SDF) protocol in the cooperative communication network with one source, one relay, and one destination, where each node has two transmit and receive antennas, is analyzed in terms of the bit error rate (BER) obtained from the pairwise error probability (PEP). For the slow-varying Rayleigh fading channel, the optimal and suboptimal power allocation ratios are determined without feedback. The optimal power allocation can be obtained by minimizing the average PEP. For the tractability, an alternative strategy of maximizing the product SNR of direct and relay links, which we call the suboptimal power allocation, is considered. Through the numerical analysis, we show that the performance gap between the suboptimal and the optimal power allocation is negligible in the high SNR region.
Keywords
Cooperative diversity; power allocation; product signal-to-noise ratio (SNR); soft-decision-and-forward (SDF);
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