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Game Theory-Based Power Allocation Strategy for NOMA in 5G Cooperative Beamforming

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Abstract

Non-orthogonal multiple access (NOMA) is a Fifth Generation (5G) technique that allows many users to simultaneously access the same time–frequency separating channels via successive interference cancellation (SIC) receiver. Cooperative NOMA (CNOMA) is an effective tool to prevent performance degradation of far users by allocating minimal power to users with good channel conditions. In this paper, we proposed a fair power and channel allocation scheme based on the Nash bargaining solution (NBS) game solution in full-duplex, cooperative beamforming (BF) for multicarrier (MC) NOMA. The proposed NBS scheme assigns optimal power and channel allocation according to channel conditions while maintaining a fair rate amongst cooperative users. NBS provides a fair and optimum approach for maximizing the total rate of CNOMA. The signal-to-leakage (SLR) ratio precoding technique is considered as a design performance criterion for beamforming vector towards achieving power domain CNOMA players. Simulation results show that at BER = \({10}^{-5}\), the NBS power allocation (proposed scheme) improved by 2 dB in terms of Signal-to-Noise Ratio (SNR), compared with the non-cooperative scheme, and 3 dB compared with the multiple-input multiple-output NOMA (MIMO-NOMA). Both improvements were as a result of interference reduction and information sharing in the network. In terms of fairness, the proposed NBS scheme shown a high level of fairness at 0.8401, compared to the other similar approaches in the literature.

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Correspondence to Rosdiadee Nordin.

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The authors declare there is no conflict of interest in the publication. Although we do not get any funding to publish this work, we wish to express our gratitude to the management of Universiti Kebangsaan Malaysia (UKM) for their support. The raw data used in this study is generated from MATLAB simulation. However, the authors have ensured that it is represented close to the real-world environment. Unfortunately, the MATLAB code is not available for the public, but we acknowledged the references and indicated the simulation environment in this paper to develop the code. The first author was responsible for designing and developing the methodology and result, while the second author improved the Game Theory problem formulation in the paper. The third author and fourth author provided ideas, layout, improve writing and added clarity to the paper, while the final author is the principal Ph.D. supervisor to the first author that provided the path towards the publication of this work.

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Fadhil, M., Kelechi, A.H., Nordin, R. et al. Game Theory-Based Power Allocation Strategy for NOMA in 5G Cooperative Beamforming. Wireless Pers Commun 122, 1101–1128 (2022). https://doi.org/10.1007/s11277-021-08941-y

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