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The authors investigate a power assignment scheme in multirelay adaptive Decode-and-Forward (DF) cooperative-diversity networks over non-identical Rayleigh fading channels, that integrates truncated Automatic Repeat-reQuest (ARQ) at the link layer. At the cooperative level, only the reliable relays participate in the retransmission phase if necessary. In this paper, they aim at maximizing the system throughput via power optimization and they show that this can be done by minimizing the Symbol-Error Rate (SER) of the retransmission. They derive the closed-form expressions for the exact SER of the multi-relay adaptive DF over non-identical Rayleigh fading channels as well as the asymptotic bounds for the SER.
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