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Performance analysis of SWIPT-assisted adaptive NOMA/OMA system with hardware impairments and imperfect CSI

  • Jing Guo (School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology) ;
  • Jin Lu (School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology) ;
  • Xianghui Wang (School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology) ;
  • Lili Zhou (School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology)
  • Received : 2021.11.23
  • Accepted : 2022.04.18
  • Published : 2023.04.20
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Abstract

This paper investigates the effect of hardware impairments (HIs) and imperfect channel state information (ICSI) on a SWIPT-assisted adaptive nonorthogonal multiple access (NOMA)/orthogonal multiple access (OMA) system over independent and nonidentical Rayleigh fading channels. In the NOMA mode, the energy-constrained near users act as a relay to improve the performance for the far users. The OMA transmission mode is adopted to avoid a complete outage when NOMA is infeasible. The best user selection scheme is considered to maximize the energy harvested and avoid error propagation. To characterize the performance of the proposed systems, closed-form and asymptotic expressions of the outage probability for both near and far users are studied. Moreover, exact and approximate expressions of the ergodic rate for near and far users are investigated. Simulation results are provided to verify our theoretical analysis and confirm the superiority of the proposed NOMA/OMA scheme in comparison with the conventional NOMA and OMA protocol with/without HIs and ICSI.

Keywords

Acknowledgement

This research was supported by the National Natural Science Foundation of China under Grants 61801281 and 62171265.

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