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Wireless and Satellite Systems. 14th EAI International Conference, WiSATS 2024, Harbin, China, August 23–25, 2024, Proceedings, Part I

Research Article

Sum Rate Maximization for NOMA-Aided Cell-Free System

Cite
BibTeX Plain Text
  • @INPROCEEDINGS{10.1007/978-3-031-86196-3_25,
        author={Qiling Gao and Zhongming Feng and Yun Lin},
        title={Sum Rate Maximization for NOMA-Aided Cell-Free System},
        proceedings={Wireless and Satellite Systems. 14th EAI International Conference, WiSATS 2024, Harbin, China, August 23--25, 2024, Proceedings, Part I},
        proceedings_a={WISATS},
        year={2025},
        month={3},
        keywords={Beamforming design Cell-free Non-orthogonal multiple access},
        doi={10.1007/978-3-031-86196-3_25}
    }
    
  • Qiling Gao
    Zhongming Feng
    Yun Lin
    Year: 2025
    Sum Rate Maximization for NOMA-Aided Cell-Free System
    WISATS
    Springer
    DOI: 10.1007/978-3-031-86196-3_25
Qiling Gao1,*, Zhongming Feng1, Yun Lin1
  • 1: School of Information and Communication Engineering, Harbin Engineering University
*Contact email: qilinggao@outlook.com

Abstract

In this paper, a downlink non-orthogonal multiple access (NOMA)-aided cell-free system is proposed. Multiple access points (APs) are distributed in a wide area and cooperatively serve users using NOMA. A sum rate maximization problem is formulated, where the beamforming coefficients at APs are jointly optimized subject to the minimum rate requirements and decoding order of NOMA users. An iterative algorithm is proposed, where semi-definite programming (SDP) and penalty based methods are employed to address the resultant non-convex problem. Numerical results show that our proposed algorithm converges within 10 iterations, and the sum rate enhancement can be achieved with the aid of our proposed algorithm compared to the orthogonal multiple access (OMA) system. Furthermore, NOMA achieves better user fairness compared with spatial domain multiple access (SDMA), while may suffer a sum rate loss.

Keywords
Beamforming design Cell-free Non-orthogonal multiple access
Published
2025-03-27
Appears in
SpringerLink
http://dx.doi.org/10.1007/978-3-031-86196-3_25
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