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Cooperative diversity uses relays to assist source-destination transmissions to reduce link outage rates in multipath fading environments. In this paper, the authors model relay selection as a semi-Markov process to analyze the impact of relay selection overhead on throughput, delay, and jitter in a simple scenario. Results show that the selection overhead can significantly reduce benefits of reactive relay selection if data frames are small or only few nodes overhear the transmissions. Relaying with a pre-assigned relay can be more beneficial in such cases.
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