University of Oulu

Endrit Dosti, Mohammad Shehab, Hirley Alves, Matti Latva-aho, On the performance of non-orthogonal multiple access in the finite blocklength regime, Ad Hoc Networks, Volume 84, 2019, Pages 148-157, ISSN 1570-8705,

On the performance of non-orthogonal multiple access in the finite blocklength regime

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Author: Dosti, Endrit1; Shehab, Mohammad2; Alves, Hirley2;
Organizations: 1Department of Electrical and Computer Engineering, University of Toronto, Oulu, Canada
2Centre for Wireless Communications (CWC), University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2019-01-07


In this paper, we present a finite-block-length comparison between the orthogonal multiple access (OMA) scheme and the non-orthogonal multiple access (NOMA) for the uplink channel. First, we consider the Gaussian channel, and derive the closed form expressions for the rate and outage probability. Then, we extend our results to the quasi-static Rayleigh fading channel. Our analysis is based on the recent results on the characterization of the maximum coding rate at finite block-length and finite block-error probability. The overall system throughput is evaluated as a function of the number of information bits, channel uses and power. We find what would be the respective values of these different parameters that would enable throughput maximization. Furthermore, we analyze the system performance in terms of reliability and throughput when applying the type-I ARQ protocol with limited number of retransmissions. The throughput and outage probability are evaluated for different blocklengths and number of information bits. Our analysis reveals that there is a trade-off between reliability and throughput in the ARQ. While increasing the number of retransmissions boosts reliability by minimizing the probability of reception error, it results in more delay which decreases the throughput. Nevertheless, the results show that NOMA always outperforms OMA in terms of throughput, reliability and latency regardless of the users priority or the number of retransmissions in both Gaussian and fading channels.

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Series: Ad hoc networks
ISSN: 1570-8705
ISSN-E: 1570-8713
ISSN-L: 1570-8705
Volume: 84
Pages: 148 - 157
DOI: 10.1016/j.adhoc.2018.10.001
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work is partially supported by Aka Project SAFE (Grant no. 303532), and by Finnish Funding Agency for Technology and Innovation (Tekes), Bittium Wireless, Keysight Technologies Finland, Kyynel, MediaTek Wireless, and Nokia Solutions and Networks.
Academy of Finland Grant Number: 303532
Detailed Information: 303532 (Academy of Finland Funding decision)
Copyright information: © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license. (