Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels - 2018


Energy potency of three common hybrid automatic repeat request (HARQ) schemes, as well as Sort I HARQ, HARQ with chase combining (HARQ-CC) and HARQ with incremental redundancy (HARQ-IR), is analyzed and joint power allocation and rate choice to maximize the energy potency is investigated during this Project. Unlike prior literature, time-correlated fading channels are thought of and 2 widely involved quality of service (QoS) constraints, i.e., outage and goodput constraints, also are considered in the optimization, which additional differentiates this Project from previous ones. Using a unified expression of asymptotic outage probabilities, optimal transmission powers and optimal rate are derived in closed forms to maximize the energy potency while satisfying the QoS constraints. These closed-form solutions then enable an intensive analysis of the maximal energy efficiencies of varied HARQ schemes. It's revealed that with low-outage constraint, the maximal energy potency achieved by Kind I HARQ is one 4 ln 2 b/J, while HARQ-CC and HARQ-IR will achieve the same maximal energy potency as ? eight four ln 2 b/J, where ? 8 = one.6617. Moreover, time correlation in the fading channels features a negative impact on the energy potency, whereas large maximal allowable variety of transmissions is favorable for the improvement of energy efficiency. The effectiveness of the energy-efficient optimization is verified by in depth simulations and therefore the results conjointly show that HARQ-CC can achieve the most effective tradeoff between energy efficiency and spectral potency among the 3 HARQ schemes.

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