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This paper addresses the problem of optimal power allocation for Hybrid Automatic Repeat reQuest (HARQ) feedback over slowly-fading channels. The authors mainly focus on the repetition time diversity HARQ scheme where the results are obtained for both continuous and bursting communication models. Moreover, the effect of an outage probability constraint on the system data transmission efficiency is studied under different transmission power constraints. Simulation results show that for Nakagami fading channels, the optimal HARQ-based (re)transmission powers maximizing the system throughput should be decreasing in every (re)transmission round, higher rates are achieved in the continuous communication, when compared with the bursting model, and HARQ feedback leads to considerable performance improvement even in outage-limited conditions.
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