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Recent Advances in Electrical & Electronic Engineering

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ISSN (Print): 2352-0965
ISSN (Online): 2352-0973

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Research Article

Relay Selection-aware Non-orthogonal Multiple Access Networks: Direct and Relaying Mode

Author(s): Dinh-Thuan Do* and Minh-Sang V. Nguyen

Volume 13, Issue 3, 2020

Page: [348 - 354] Pages: 7

DOI: 10.2174/2352096512666181130164755

Price: $65

Abstract

Objective: In this paper, Decode-and-Forward (DF) mode is deployed in the Relay Selection (RS) scheme to provide better performance in cooperative downlink Non-orthogonal Multiple Access (NOMA) networks. In particular, evaluation regarding the impact of the number of multiple relays on outage performance is presented.

Methods: As main parameter affecting cooperative NOMA performance, we consider the scenario of the fixed power allocations and the varying number of relays. In addition, the expressions of outage probabilities are the main metric to examine separated NOMA users. By matching related results between simulation and analytical methods, the exactness of derived formula can be verified.

Results: The intuitive main results show that in such cooperative NOMA networks, the higher the number of relays equipped, the better the system performance can be achieved.

Conclusion: DF mode is confirmed as a reasonable selection scheme to improve the transmission quality in NOMA. In future work, we will introduce new relay selections to achieve improved performance.

Keywords: Non-orthogonal multiple access, relay selection, outage probability, decode-and-forward, cooperative NOMA, quality of science.

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