Reconfigurable intelligent surface assisted mobile network with randomly moving user over Fisher-Snedecor fading channel

Abstract

This paper evaluates the performance of a reconfigurable intelligent surface (RIS)-assisted mobile system with random user mobility. The RIS is assumed to act as an intelligent access point and the system channel follows Fisher–Snedecor (F) distribution with the user mobility subjected to random way point (RWP) model. Based on this, the novel probability distribution function (PDF) are derived for the received power at the mobile unit. Through this, the analytical closed-form expression for the outage probability, average bit error rate (ABER) and the average capacity under different transmission policies are then obtained. To gain future physical insight to the derived expressions, the asymptotic expressions for the system performance are obtained through which the system diversity gain is determined. The accuracy of these derived expressions is validated through the Monte Carlo simulations. Thus, the findings show that different system and channel parameters affect the performance of the concerned system and the system diversity is the function of number of RIS elements and channel severity parameter m. With the increase in the number of reflecting elements of RIS, there is significant improvement in the system performance.