Study on Reconfigurable Repeater-Based RSMA Systems

Abstract

The key idea of using active reconfigurable repeaters (ARRs) is to enhance wireless communications by amplifying incoming signals with minimal signal processing complexity and design overhead, while leveraging rate-splitting multiple-access (RSMA) for efficient interference management and simplified multiple-access operations. However, signal attenuation in wireless propagation over long distances leads to poor performance quality for RSMA users. This raises the concern: Can RSMA systems exploit ARRs to improve user performance and fairness? This letter concentrates on a typical two-user scenario, develops information-theoretic analytical frameworks for outage probability and ergodic rate, and constructs efficient optimization frameworks to ensure user fairness.