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Traditional link-layer Automatic Repeat reQuest (ARQ) protocols attempt to retransmit the corrupted frames regardless of the channel state. Since, this channel-state unaware behavior may cause unnecessary retransmissions, traditional ARQ protocols may not be energy efficient. Some channel-adaptive ARQ ideas have been proposed, such as, channel probing based ARQ and stochastic learning automaton based ARQ. However, these algorithms do not make use of the channel fading properties. Instead, the retransmission decision is made according to a binary feedback - whether the previous frame was successful or not. In this paper, the authors present four algorithms, which incorporate the channel state estimate in the feedback process to judiciously select a frame transmission/retransmission timing instant.
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