Rate splitting multiple access (RSMA) is intrinsically amalgamated with simultaneously transmitting and reflecting (STAR) reconfigurable intelligent surfaces (RIS) to enhance energy efficiency (EE) of the finite block length (FBL) multiple-input multiple-output (MIMO) downlink. An alternating optimization-based algorithm is proposed to jointly optimize the transmit beamforming matrices, STAR-RIS configurations, and rate-splitting parameters. STAR-RIS attains 360-degree full-plane coverage, while RSMA provides a prominent gain by efficiently managing interference. Numerical results reveal a strong synergy between RSMA and STAR-RIS, demonstreating significant EE gains over reflective RIS and spatial division multiple access (SDMA).
@article{arxiv.2508.00409,
title = {STAR-RIS-aided RSMA for the URLLC multi-user MIMO Downlink},
author = {Mohammad Soleymani and Ignacio Santamaria and Eduard Jorswieck and Robert Schober and Lajos Hanzo},
journal= {arXiv preprint arXiv:2508.00409},
year = {2025}
}
Comments
Accepted at 28th International Workshop on Smart Antennas 2025