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Author: Xu Wenbo
Publisher: Springer Publishing Company
ISSN: 0929-6212
Source: Wireless Personal Communications, Vol.54, Iss.4, 2010-09, pp. : 559-578
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
This paper presents the performance of cooperative ARQ schemes in Nakagami-m fading networks, where coherent equal gain code combining is adopted to combine the retransmitted signals at the destination. Two different retransmission protocols are adopted upon the reception failure of the destination. Once the relay node can decode correctly, the retransmission will be performed by relay in protocol I or the better node between source and relay in protocol II, where the better means having a better channel to the destination. By approximating the product of two independent Nakagami-m random variables to the sum of two independent gamma random variables, the performance of protocol I is derived at high signal-to-noise ratio (SNR). We further develop the approximation for the product of two maximum Nakagami-m random variables, which is employed to obtain the performance of protocol II at high SNR. The reliability of theoretical analysis is validated by simulation results, where the advantages of these two protocols upon the conventional protocols are presented.
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