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Analysis of HARQ-IR over Time-Correlated Rayleigh Fading Channels
Zheng Shi1; Haichuan Ding2,3; Shaodan Ma1; Kam-Weng Tam1
Source PublicationIEEE Transactions on Wireless Communications

In this paper, performance of hybrid automatic repeat request with incremental redundancy (HARQ-IR) over Rayleigh fading channels is investigated. Different from prior analysis, time correlation in the channels is considered. Under time-correlated fading channels, the mutual information in multiple HARQ transmissions is correlated, making the analysis challenging. By using polynomial fitting technique, probability distribution function of the accumulated mutual information is derived. Three meaningful performance metrics including outage probability, average number of transmissions, and long term average throughput (LTAT) are then derived in closed-forms. Moreover, diversity order of HARQ-IR is also investigated. It is proved that full diversity can be achieved by HARQ-IR, i.e., the diversity order is equal to the number of transmissions, even under time-correlated fading channels. These analytical results are verified by simulations and enable the evaluation of the impact of various system parameters on the performance. Particularly, the results unveil the negative impact of time correlation on the outage and throughput performance. The results also show that although more transmissions would improve the outage performance, they may not be beneficial to the LTAT when time correlation is high. Optimal rate design to maximize the LTAT is finally discussed and significant LTAT improvement is demonstrated.

KeywordHybrid Automatic Repeat Request Incremental Redundancy Time Correlation Rayleigh Fading Channels Outage Probability
Indexed BySCIE
WOS Research AreaEngineering ; Telecommunications
WOS SubjectEngineering, Electrical & Electronic ; Telecommunications
WOS IDWOS:000366848200044
The Source to ArticleEngineering Village
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Cited Times [WOS]:14   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Faculty of Science and Technology
Affiliation1.Department of Electrical and Computer Engineering, University of Macau, China;
2.University of Macau, China;
3.Department of Electrical and Computer Engineering, University of Florida, Gainesville; FL; 32601, United States
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Zheng Shi,Haichuan Ding,Shaodan Ma,et al. Analysis of HARQ-IR over Time-Correlated Rayleigh Fading Channels[J]. IEEE Transactions on Wireless Communications,2015,14(12):7096-7109.
APA Zheng Shi,Haichuan Ding,Shaodan Ma,&Kam-Weng Tam.(2015).Analysis of HARQ-IR over Time-Correlated Rayleigh Fading Channels.IEEE Transactions on Wireless Communications,14(12),7096-7109.
MLA Zheng Shi,et al."Analysis of HARQ-IR over Time-Correlated Rayleigh Fading Channels".IEEE Transactions on Wireless Communications 14.12(2015):7096-7109.
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