Optimal Power Allocation and Cooperative Relaying under Fuzzy Inference System (FIS) Based Downlink PD-NOMA

Mahmood, Asif and Marey, Mohamed and Nasralla, Moustafa M. and Esmail, Maged A. and Zeeshan, Muhammad (2022) Optimal Power Allocation and Cooperative Relaying under Fuzzy Inference System (FIS) Based Downlink PD-NOMA. Electronics (Switzerland), 11 (9). ISSN 2079-9292

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Abstract

Optimal power allocation (PA) is a decisive part of the power domain non-orthogonal multiple access (PD-NOMA) technique. In PD-NOMA, users are served at the same time and using the same frequency band, but at differing power levels. In this paper, the optimization problem for PA is formulated with distance (d), signal-to-noise ratio (SNR), and foliage depth (df) constraints. A fuzzy inference system (FIS) addresses the optimization problem by allocating the optimal power factors (power levels) to each user in the vicinity of a 5G base-station (gNodeB). The proposed system incorporates a cooperative relaying technique at the near-user to assist the far-user facing signal degradation and greater path losses. A realistic 5G micro-cell is analyzed for downlink PD-NOMA where superposition coding (SC) is used at the transmitter side, a successive interference cancellation (SIC) scheme at the near-user, and a maximum ratio combining (MRC) technique at the far-user’s receiver, respectively. For both simple PD-NOMA and cooperative relaying PD-NOMA, the presented technique’s bit-error-rate (BER) performance is evaluated against various SNR values, and it is concluded that cooperative PD-NOMA outperforms simple PD-NOMA. By combining the presented FIS system with cooperation relaying, the proposed FIS method guarantees user fairness in PD-NOMA systems while also significantly improving performance.

Item Type:	Article
Additional Information:	Funding Information: Funding: The Article Processing Charges (APC) was funded by Prince Sultan University. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Uncontrolled Keywords:	/dk/atira/pure/subjectarea/asjc/2200/2207
Departments or Groups:
Depositing User:	Admin SSL
Date Deposited:	19 Oct 2022 23:13
Last Modified:	04 Aug 2023 22:25
URI:	http://repository-testing.wit.ie/id/eprint/4720

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