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On the Performance of HARQ Protocols With Blanking in NOMA Systems

Mheich, Zeina, Yu, Wenjuan, Xiao, Pei, Quddus, Atta and Maaref, Amine (2020) On the Performance of HARQ Protocols With Blanking in NOMA Systems IEEE Transactions on Wireless Communications.

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Abstract

In this paper, we investigate the throughput performance of single-packet and multi-packet hybrid-automatic repeat request (HARQ) with blanking for downlink non-orthogonal multiple access (NOMA) systems. While conventional singlepacket HARQ achieves high throughput at the expense of high latency, multi-packet HARQ, where several data packets are sent in the same channel block, can achieve high throughput with low latency. Previous works have shown that multi-packet HARQ outperforms single-packet HARQ in orthogonal multiple access (OMA) systems, especially in the moderate to high signal-tonoise ratio regime. This work amalgamates multi-packet HARQ with NOMA to achieve higher throughput than the conventional single-packet HARQ and OMA, which has been adopted in the legacy mobile networks. We conduct theoretical analysis for the throughput per user and also investigate the optimization of the power and rate allocations of the packets, in order to maximize the weighted-sum throughput. It is demonstrated that the gain of multi-packet HARQ over the single-packet HARQ in NOMA systems is reduced compared to that obtained in OMA systems due to inter-user interference. It is also shown that NOMAHARQ cannot achieve any throughput gain with respect to OMAHARQ when the error propagation rate of the NOMA detector is above a certain threshold.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Mheich, Zeinaz.mheich@surrey.ac.uk
Yu, Wenjuanw.yu@surrey.ac.uk
Xiao, PeiP.Xiao@surrey.ac.uk
Quddus, AttaA.Quddus@surrey.ac.uk
Maaref, Amine
Date : 20 July 2020
Uncontrolled Keywords : Non-orthogonal multiple access, hybrid automatic repeat request, throughput, power allocation, rate allocation.
Additional Information : Embargo Pending Metadata Pending
Depositing User : James Marshall
Date Deposited : 21 Jul 2020 12:55
Last Modified : 21 Jul 2020 12:55
URI: http://epubs.surrey.ac.uk/id/eprint/858259

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