Non-orthogonal multiple access schemes with partial relay selection

Lee, Sunyoung, Da Costa, Daniel Benevides, Vien, Quoc-Tuan ORCID: https://orcid.org/0000-0001-5490-904X, Duong, Trung Q. and De Sousa Jr., Rafael Timoteo (2017) Non-orthogonal multiple access schemes with partial relay selection. IET Communications, 11 (6). pp. 846-854. ISSN 1751-8628

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Abstract

In this paper, non-orthogonal multiple access (NOMA) in amplify-and-forward relay systems with partial relay selection (PRS) is investigated. More specifically, new exact closed-form expressions for the outage probabilities at two users are derived, based on which an asymptotic analysis at high signal- to-noise ratio (SNR) is carried out. Additionally, in order to investigate the performance gap between the NOMA and orthogonal multiple access (OMA) schemes, a closed-form approximate expression at high SNR for the sum rate is derived. Furthermore, relying on our results, the impact of the PRS on the sum rate and outage probability of the proposed NOMA scheme is examined. In particular, the derived asymptotic expressions show that the proposed scheme can improve over the traditional OMA not only the sum rate but also the user fairness. Finally, simulation results are presented to corroborate the analytical results.

Item Type: Article
Research Areas: A. > School of Science and Technology > Computer and Communications Engineering
Item ID: 21819
Notes on copyright: This paper is a postprint of a paper submitted to and accepted for publication in IET Communications and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library: http://digital-library.theiet.org/content/journals/10.1049/iet-com.2016.0836
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Depositing User: Quoc-Tuan Vien
Date Deposited: 12 May 2017 15:24
Last Modified: 02 Apr 2019 08:31
URI: https://eprints.mdx.ac.uk/id/eprint/21819

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