Abstract
Cooperative diversity is a communication technique
where a relay node provides signal diversity to the destination
by retransmitting the signal received from the source. To find an
optimal relay and maximize the resulting performance, a relay
selection procedure is used with channel state information as a
selection metric. In this paper, we model cooperative diversity
with relay selection as a Markov chain, and study the impact of
selection timing on throughput and energy efficiency in Rayleigh
fading channels. Based on obtained results, we determine optimal
relay selection schemes for various network scenarios.
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