Abstract

Non-Orthogonal Multiple Access (NOMA) is an effective innovation for fifth-generation and forthcoming wireless technology. NOMA aims to encounter the challenges of low latency, high accuracy, large availability, and peak performance. In this paper, the performance mechanisms of NOMA are discussed as compared to Orthogonal Multiple Access (OMA), and also for different user (far and near) scenarios. The techniques such as Heterogeneous Network (HetNet), Ultra-Reliable Low-Latency Communication (URLLC), and other 5G evolving technologies are highlighted for improved performance in the NOMA system. The simulation results are carried out to analyze the achievable capacity of OMA and NOMA, BER analysis, and sum-rate analysis of NOMA systems over Rayleigh and Rician fading channels. The simulation results reveal that the Rician fading channels have better performance than Rayleigh fading channels. This article also discusses potential research challenges as well as addressing current and future issues in NOMA.

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