Title: Throughput enhancement of NOMA systems with energy harvesting

Authors: Nadhir Ben Halima; Sajid Mubashir Sheikh

Addresses: Department of Information Technology, Community College of Qatar, Doha, 7344, Qatar ' Department of Electrical Engineering, University of Botswana, Private Bag UB 0061, Gaborone, Botswana

Abstract: This paper proposes an optimal energy harvesting time, users pairing and resource allocation (OHUPRA) for non-orthogonal multiple access (NOMA). The base station (BS) harvests power from the radio frequency (RF) signal of node A over αF seconds where 0 < α < 1 is the harvesting time and F is frame duration. Then, it transmits data to KL users over L bands during (1 α)F seconds where transmission to the ith set of K users is performed using NOMA on the ith band. We optimise α, the set of NOMA users (users' pairing) and the allocated NOMA powers. The performance of OHUPRA is compared to NOMA, NOMA with optimal harvesting time (NOMA OH), NOMA with optimal user pairing and resource allocation (OUPRA). OHUPRA offers up to 12 dB, 16 dB and 20 dB versus OUPRA, NOMA OH and NOMA. The main contribution and innovation of this paper are to optimise harvesting time, users' pairing and resource allocation to maximise the throughput.

Keywords: non-orthogonal multiple access; NOMA; energy harvesting; EH; Rayleigh channels; optimal user pairing and resource allocation; OHUPRA; power allocation.

DOI: 10.1504/IJAHUC.2024.137596

International Journal of Ad Hoc and Ubiquitous Computing, 2024 Vol.45 No.4, pp.266 - 270

Received: 30 Oct 2023
Accepted: 04 Dec 2023
Published online: 27 Mar 2024 *

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