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Spectral-efficiency optimization for NOMA-based amplify-and-forward cooperative relaying systems with beamforming and power allocation

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Abstract

In this paper, we propose a novel spectrum-efficiency (SE) optimization scheme for amplify-and-forward (AF) cooperative relaying systems based on non-orthogonal multiple-access (NOMA). In this network, a weighted-sum-minimum mean-squared-error (WSMMSE) method is utilized to transform the original non-convex optimization problem into a tractable optimization problem. Then, the relay beamforming-matrix (BM) and the power-allocation (PA) coefficients are alternately optimized by use of the iterative beamforming method and the Lagrange-multiplier (LM) method subject to the quality-of-service requirements. Monte Carlo simulation results verify that our proposed new scheme can attain better performance than the optimal PA-NOMA technique and the conventional orthogonal multiple-access (OMA) technique.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant No. 61801093.

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Authors and Affiliations

  1. School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Kai Yang, Xiao Yan, Qian Wang & Kaiyu Qin

  2. School of Electrical Engineering and Computer Science, Louisiana State University, Baton Rouge, LA, 70803, USA

    Hsiao-Chun Wu

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  1. Kai Yang
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  2. Xiao Yan
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  3. Qian Wang
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  4. Hsiao-Chun Wu
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  5. Kaiyu Qin
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Correspondence to Xiao Yan.

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Yang, K., Yan, X., Wang, Q. et al. Spectral-efficiency optimization for NOMA-based amplify-and-forward cooperative relaying systems with beamforming and power allocation. Wireless Netw 27, 4123–4132 (2021). https://doi.org/10.1007/s11276-021-02733-9

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  • DOI: https://doi.org/10.1007/s11276-021-02733-9

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