Capacity and Performance Analysis of RIS-Assisted Communication Over Rician Fading Channels

TL;DR

This paper analyzes the capacity and error rate of mmWave communication systems aided by reconfigurable intelligent surfaces under Rician fading, providing new closed-form formulas for key performance metrics.

Contribution

It introduces unified closed-form formulas for ergodic capacity and symbol error probability in RIS-assisted mmWave systems with Rician fading, advancing performance analysis methods.

Findings

New closed-form formula for symbol error probability of M-QAM/M-PSK.

Closed-form expressions for ergodic capacity with and without CSI.

Enhanced understanding of RIS-assisted mmWave communication performance.

Abstract

This paper investigates two performance metrics, namely ergodic capacity and symbol error rate, of mmWave communication system assisted by a reconfigurable intelligent surface (RIS). We assume independent and identically distributed (i.i.d.) Rician fadings between user-RIS-Access Point (AP), with RIS surface consisting of passive reflecting elements. First, we derive a new unified closed-form formula for the average symbol error probability of generalised M-QAM/M-PSK signalling over this mmWave link. We then obtain new closed-form expressions for the ergodic capacity with and without channel state information (CSI) at the AP.