RIS-Aided Multi-Antenna IoT Systems: Performance Evaluation under MRC Combining
Thien P. NGUYEN, Dinh Tung VO, Quang-Sy VU, Minh TRAN, Quang-Sang NGUYEN, Taejoon KIM
DOI: 10.15598/aeee.v23i3.250801
Abstract
Reconfigurable Intelligent Surfaces (RISs) have emerged as a promising solution for future wireless communication systems due to their ability to reconfigure the radio propagation environment in a cost and energy efficient manner. This study focuses on the performance of RIS assisted wireless systems where the receiver is equipped with multiple antennas and employs receive diversity techniques, specifically Maximal Ratio Combining (MRC), over Rayleigh fading channels. We derive new closed form expressions for the outage probability (OP) by modeling the signal to noise ratio (SNR) as a Gamma distributed random variable. To validate the analytical expressions, Monte Carlo simulations are conducted and demonstrate a high level of agreement with the theoretical analysis. The obtained results offer useful insights into the efficient integration of RIS and antenna diversity for enhancing link reliability under severe fading conditions.