The Impact of User-Pairing on the Performance of Non-Orthogonal Multiple Access (NOMA) System

Ayad Q. Abdulkareem; Ziad Qais   Al-Abbasi; Mustafa Nadhim Ghazal; Khalid Awaad Humood

doi:10.24237/djes.2022.15108

Authors

Ayad Q. Abdulkareem
ziad.al-abbasi@mtu.edu.iq
Department of Electronic Engineering, College of Engineering, University of Diyala
Ziad Qais Al-Abbasi Middle Technical University (MTU), Baquba Technical Institute - Electrical Techniques Department, Diyala, Iraq https://orcid.org/0000-0001-7062-3383
Mustafa Nadhim Ghazal College of Engineering, University of Diyala, 32001 Diyala, Iraq
Khalid Awaad Humood Department of Electronic Engineering, College of Engineering, University of Diyala, 32001 Diyala, Iraq

Keywords:

Non-orthogonal multiple access (NOMA), User pairing, Sum rate, Energy efficiency

Abstract

Non-orthogonal multiple access (NOMA) is being considered as a candidate to meet the expected traffic demand growth in 5G and beyond 5G (5GB) networks. Due to the complexity of applying multiuser detection at the NOMA receiver, a number of works have suggested applying user-pairing to simplify dealing with all users as a whole. This paper addresses the effect of applying user-pairing on the performance of NOMA assisted system in general proposes three different user pairing approaches to examine which one is best for boosting the performance of multiuser NOMA system and making it reaches its potential. This paper evaluates the performance of NOMA system with organized (uniform), random, and distance-based user pairing schemes. Simulation results show that the organized pairing assisted NOMA scheme offers the best performance as compared to its pairing peer techniques in terms of the overall sum rate and the energy efficiency.

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