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Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels
Shi, Zheng1; Ma, Shaodan2; Yang, Guanghua1; Alouini, Mohamed-Slim3

Energy efficiency of three common hybrid automatic repeat request (HARQ) schemes, including Type I HARQ, HARQ with chase combining (HARQ-CC) and HARQ with incremental redundancy (HARQ-IR), is analyzed and joint power allocation and rate selection to maximize the energy efficiency is investigated in this paper. Unlike prior literature, time-correlated fading channels are considered and two widely concerned quality of service (QoS) constraints, i.e., outage and goodput constraints, are also considered in the optimization, which further differentiates this paper from prior ones. Using a unified expression of asymptotic outage probabilities, optimal transmission powers and optimal rate are derived in closed forms to maximize the energy efficiency while satisfying the QoS constraints. These closed-form solutions then enable a thorough analysis of the maximal energy efficiencies of various HARQ schemes. It is revealed that with low-outage constraint, the maximal energy efficiency achieved by Type I HARQ is 1/4ln2 b/J, while HARQ-CC and HARQ-IR can achieve the same maximal energy efficiency as kappa(infinity)/4ln2 b/J, where kappa(infinity) = 1.6617. Moreover, time correlation in the fading channels has a negative impact on the energy efficiency, whereas large maximal allowable number of transmissions is favorable for the improvement of energy efficiency. The effectiveness of the energy-efficient optimization is verified by extensive simulations and the results also show that HARQ-CC can achieve the best tradeoff between energy efficiency and spectral efficiency among the three HARQ schemes.

KeywordEnergy Efficiency Time-correlated Fading Channels Hybrid Automatic Repeat Request Power Allocation And Rate Selection
URLView the original
Indexed BySCIE
WOS Research AreaEngineering ; Telecommunications ; Transportation
WOS SubjectEngineering, Electrical & Electronic ; Telecommunications ; Transportation Science & Technology
WOS IDWOS:000435553400021
The Source to ArticleWOS
Scopus ID2-s2.0-85044094519
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Cited Times [WOS]:7   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Science and Technology
Corresponding AuthorYang, Guanghua
Affiliation1.Jinan University
2.University of Macau
3.King Abdullah University of Science and Technology
Recommended Citation
GB/T 7714
Shi, Zheng,Ma, Shaodan,Yang, Guanghua,et al. Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels[J]. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY,2018,67(6):4939-4953.
APA Shi, Zheng,Ma, Shaodan,Yang, Guanghua,&Alouini, Mohamed-Slim.(2018).Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels.IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY,67(6),4939-4953.
MLA Shi, Zheng,et al."Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels".IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 67.6(2018):4939-4953.
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