Co-operative non-orthogonal multiple access networks: a survey
ISSN: 1708-5284
Article publication date: 7 November 2023
Issue publication date: 5 December 2024
Abstract
Purpose
The purpose of this paper is to present an up-to-date survey on the non-orthogonal multiple access (NOMA) technique with co-operative strategy, a fast-evolving fifth-generation (5 G) technology. NOMA is used for serving many mobile users, both in power and code domains. This paper considers the power-domain NOMA, which is now discussed as NOMA.
Design/methodology/approach
The first part of the paper discusses NOMA-based cooperative relay systems using different relay strategies over different channel models. In various research works, the analytical expressions of many performance metrics were derived, measured and simulated for better performance of the NOMA systems. In the second part, a brief introduction to diversity techniques is discussed. The multiple input and multiple output system merged with cooperative NOMA technology, and its future challenges were also presented in this part. In the third part, the paper surveys some new conceptions such as cognitive radio, index modulation multiple access, space-shift keying and reconfigurable intelligent surface that can be combined with NOMA systems for better performance.
Findings
The paper presents a brief survey of diverse research projects being carried out in the field of NOMA. The paper also surveyed two different relaying strategies that were implemented in cooperative NOMA over different channels and compared several performance parameters that were evaluated and derived in these implementations.
Originality/value
The paper provides a scope for recognizable future work and presents a brief idea of the new techniques that can be united with NOMA for better performance in wireless systems.
Keywords
Acknowledgements
Conflicts of interests/competing interests: There is no conflict between any of the authors with regard to any of the matters related to this review article. All have mutually discussed and consciously submitted the review article to the World Journal of Engineering without any competing interests.
Funding information: No funding/grant was received for the preparation of this review article.
Data availability statements: Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
Citation
K., A. and V.K., J. (2024), "Co-operative non-orthogonal multiple access networks: a survey", World Journal of Engineering, Vol. 21 No. 6, pp. 1128-1141. https://doi.org/10.1108/WJE-11-2022-0451
Publisher
:Emerald Publishing Limited
Copyright © 2023, Emerald Publishing Limited