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Energy harvesting relay selection and power allocation in cooperative secure NOMA networks with imperfect SIC over Nakagami-m channel

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Abstract

In this paper, we consider a cooperative non-orthogonal multiple access (NOMA) system with imperfect successive interference cancellation over Nakagami-m fading channel. We assume that the knowledge of the energy harvesting and channels characteristics are to be known. The proposed network consists of a base station which transmits signal to the multiple users via energy harvesting relays. On the other hand, the presence of eavesdropper can severely reduce the security of transmission in the wireless channel. We propose two relay selection schemes to maximize the secrecy sum-rate while satisfying constraints on the secrecy outage probability (SOP) of NOMA users and energy consumption of the selected relay. In the first scheme, the optimal power allocation of the users is considered while in the second scheme, in addition to the power allocation of the users, the optimal power allocation of the energy harvesting relays are also considered. We propose low-complexity iterative algorithms based on the convex optimization method and Karush–Kuhn–Tucker conditions to obtain the best relay for transmission and the optimal power allocation coefficient of the users and also the relays. Simulation results are presented to show the accuracy of the analytical expressions and the effectiveness of the proposed scheme.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, University of Science and Technology of Mazandaran, P.O. Box 48518-78195, Behshahr, Iran

    Maryam Najimi

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  1. Maryam Najimi
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Correspondence to Maryam Najimi.

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Najimi, M. Energy harvesting relay selection and power allocation in cooperative secure NOMA networks with imperfect SIC over Nakagami-m channel. J Ambient Intell Human Comput 14, 6251–6261 (2023). https://doi.org/10.1007/s12652-021-03575-1

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  • DOI: https://doi.org/10.1007/s12652-021-03575-1

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