Performance of Intelligent Reconfigurable Surface-Based Wireless Communications Using QAM Signaling

TL;DR

This paper evaluates the performance of QAM signaling in IRS-assisted wireless communications, deriving new analytical expressions for error rates and demonstrating significant improvements over traditional channels, especially at low SNR levels.

Contribution

It introduces new closed-form expressions for ASER of QAM schemes in IRS-assisted channels and analyzes the impact of IRS elements and modulation parameters.

Findings

IRS significantly improves ASER performance at low SNR

Derived closed-form ASER expressions for various QAM schemes

Simulation results confirm theoretical analysis and performance gains

Abstract

Intelligent reconfigurable surface (IRS) is being seen as a promising technology for 6G wireless networks. The IRS can reconfigure the wireless propagation environment, which results in significant performance improvement of wireless communications. In this paper, we analyze the performance of bandwidth-efficient quadrature amplitude modulation (QAM) techniques for IRS-assisted wireless communications over Rayleigh fading channels. New closed-form expressions of the generic average symbol error rate (ASER) for rectangular QAM, square QAM and cross QAM schemes are derived. Moreover, simplified expressions of the ASER for low signal-to-noise-ratio (SNR) and high SNR regions are also presented, which are useful to provide insights analytically. We comprehensively analyze the impact of modulation parameters and the number of IRS elements employed. We also verify our theoretical results through simulations. Our results demonstrate that employing IRS significantly enhances the ASER performance in comparison to additive white Gaussian noise channel at a low SNR regime. Thus, IRS-assisted wireless communications can be a promising candidate for various low powered communication applications such as internet-of-things (IoT).