Outage Probability Analysis of IRS-Assisted NOMA System Over Rician Fading Channel

Abstract

In this paper, the outage probability (OP) of intelligent reflecting surface (IRS) assisted non orthogonal multiple access (NOMA) technique is derived using Rician fading channel model. NOMA has emerged as a promising technology for enhancing spectral efficiency in wireless communication systems, while IRS has shown potential in improving the overall system performance through intelligent signal reflection. By combining these two technologies, we aim to provide a comprehensive analysis of the outage probability, which is a crucial metric in assessing the reliability of communication systems. For this purpose the channel from base station (BS) to IRS and from IRS to users are considered as Rician fading channel. We consider the IRS as an array of reflective elements capable of intelligently adjusting the incident signals phase as well as amplitude. The analytical outage probability expression is derived for the proposed system model. The integrated NOMA-IRS system's effectiveness is illustrated by the simulation results. The analysis of asymptotic outage probability is utilized to calculate the system's diversity order. © 2024 IEEE.