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Research Article

Adaptive-Duplex Relay Selection for Cooperative Non-Orthogonal Multiple Access Networks

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  • @ARTICLE{10.4108/ew.7182,
        author={Jing Zhao and Xiang He},
        title={Adaptive-Duplex Relay Selection for Cooperative Non-Orthogonal Multiple Access Networks},
        journal={EAI Endorsed Transactions on Energy Web},
        volume={11},
        number={1},
        publisher={EAI},
        journal_a={EW},
        year={2024},
        month={12},
        keywords={Cooperative NOMA, relay selection, adaptive-duplex relaying, outage performance},
        doi={10.4108/ew.7182}
    }
    
  • Jing Zhao
    Xiang He
    Year: 2024
    Adaptive-Duplex Relay Selection for Cooperative Non-Orthogonal Multiple Access Networks
    EW
    EAI
    DOI: 10.4108/ew.7182
Jing Zhao1,*, Xiang He2
  • 1: Chengdu Technological University
  • 2: Xihua University
*Contact email: zjing4@cdtu.edu.cn

Abstract

To further improve the spectral efficiency of the cooperative non-orthogonal multiple access (NOMA) network with half-duplex (HD) relaying and avoid the zero diversity gain due to the imperfect self interference estimation at high signa-to-noise ratio (SNR) value with full-duplex (FD) relaying, this paper developed a novel two-stage relay selection for a two-user multi-relay cooperative NOMA systems with adaptive-duplex (AD) relaying which can switch opportunistically between HD and FD relaying modes. An adaptive duplex based on fixed power allocation factor relay selection (AD-FPA-RS) scheme for cooperative NOMA networks is proposed in this paper, the relay can switch the work mode to the FD or HD state adaptively according to the current channel state information and the result of decode at the relay. Futhermore, the exact outage probability for the proposed AD-FPA-RS scheme is obtained in closed-form expression. The simulation and numerical results show that the proposed AD-FPA-RS scheme not only outperforms the existing HD-FPARS and FD-FPA-RS schemes in terms of outage behavior significantly, but also can obtain full diversity gain without the floor outage performance at high SNR region.

Keywords
Cooperative NOMA, relay selection, adaptive-duplex relaying, outage performance
Received
2024-12-04
Accepted
2024-12-04
Published
2024-12-04
Publisher
EAI
http://dx.doi.org/10.4108/ew.7182

Copyright © 2024 J. Zhao et al., licensed to EAI. This is an open access article distributed under the terms of the CC BYNC-SA 4.0, which permits copying, redistributing, remixing, transformation, and building upon the material in any medium so long as the original work is properly cited.

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