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Achievable Diversity Order of HARQ-Aided Downlink NOMA Systems
Shi,Zheng1; Zhang,Chenmeng2; Fu,Yaru3; Wang,Hong4,5; Yang,Guanghua1; Ma,Shaodan6
Source PublicationIEEE Transactions on Vehicular Technology

The combination between non-orthogonal multiple access (NOMA) and hybrid automatic repeat request (HARQ) is capable of realizing ultra-reliability, high throughput and many concurrent connections particularly for emerging communication systems. This paper focuses on characterizing the asymptotic scaling law of the outage probability of HARQ-aided NOMA systems with respect to the transmit power, i.e., diversity order. The analysis of diversity order is carried out for three basic types of HARQ-aided downlink NOMA systems, including Type I HARQ, HARQ with chase combining (HARQ-CC) and HARQ with incremental redundancy (HARQ-IR). The diversity orders of three HARQ-aided downlink NOMA systems are derived in closed-form, where an integration domain partition trick is developed to obtain the bounds of the outage probability specially for HARQ-CC and HARQ-IR-aided NOMA systems. The analytical results show that the diversity order is a decreasing step function of transmission rate, and full time diversity can only be achieved under a sufficiently low transmission rate. It is also revealed that HARQ-IR-aided NOMA systems have the largest diversity order, followed by HARQ-CC-aided and then Type I HARQ-aided NOMA systems. Additionally, the users' diversity orders follow a descending order according to their respective average channel gains. Furthermore, we expand discussions on the cases of power-efficient transmissions and imperfect channel state information (CSI). Monte Carlo simulations finally confirm our analysis.

KeywordChase Combining Diversity Order Harq Incremental Redundancy Noma
URLView the original
Indexed BySCIE
WOS Research AreaEngineering ; Telecommunications ; Transportation
WOS IDWOS:000512550600039
Scopus ID2-s2.0-85078544550
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Cited Times [WOS]:14   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Science and Technology
Corresponding AuthorYang,Guanghua
Affiliation1.Jinan University,Zhuhai
2.Xidian University,Xi'an
3.Singapore University of Technology and Design
4.Nanjing University of Posts and Telecommunications
5.Southeast University
6.University of Macau
Recommended Citation
GB/T 7714
Shi,Zheng,Zhang,Chenmeng,Fu,Yaru,et al. Achievable Diversity Order of HARQ-Aided Downlink NOMA Systems[J]. IEEE Transactions on Vehicular Technology,2020,69(1):471-487.
APA Shi,Zheng,Zhang,Chenmeng,Fu,Yaru,Wang,Hong,Yang,Guanghua,&Ma,Shaodan.(2020).Achievable Diversity Order of HARQ-Aided Downlink NOMA Systems.IEEE Transactions on Vehicular Technology,69(1),471-487.
MLA Shi,Zheng,et al."Achievable Diversity Order of HARQ-Aided Downlink NOMA Systems".IEEE Transactions on Vehicular Technology 69.1(2020):471-487.
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