On the Performance of HARQ Protocols With Blanking in NOMA Systems

Mheich, Zeina and Yu, Wenjuan and Xiao, Pei and Ul Quddus, Atta and Maaref, Amine (2020) On the Performance of HARQ Protocols With Blanking in NOMA Systems. IEEE Transactions on Wireless Communications, 19 (11). pp. 7423-7438. ISSN 1536-1276

Text (MP_HARQ_NOMA_final)
MP_HARQ_NOMA_final.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.

Download (633kB)


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 single-packet 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-to-noise 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 NOMA-HARQ cannot achieve any throughput gain with respect to OMA-HARQ when the error propagation rate of the NOMA detector is above a certain threshold.

Item Type:
Journal Article
Journal or Publication Title:
IEEE Transactions on Wireless Communications
Additional Information:
©2021 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Uncontrolled Keywords:
ID Code:
Deposited By:
Deposited On:
03 Aug 2021 12:35
Last Modified:
15 Sep 2023 01:18