PERFORMANCE ANALYSIS OF THE NOMA NETWORK UNDER JOINT HARDWARE IMPAIRMENT AND IMPERFECT CHANNEL STATE INFORMATION

Abstract

This paper investigates the effect of hardware impairments (HWIs) on non-orthogonal multiple access (NOMA) over a Rayleigh fading channel. We consider the practical scenario of imperfect channel state information, where the base station communicates directly with the NOMA users. In order to assess the performance of the proposed system, we derive expressions for the outage probability and the closed-form bit error rate. Through simulations, we validate the numerical results, which demonstrate that the presence of these imperfections jeopardizes the NOMA system. Additionally, the HWI affects the performance of users at varying levels due to the successive interference cancellation process. Moreover, the performance of the HWIs in the NOMA system is notably influenced by the accuracy of channel estimation.