STAR-RIS-Aided RSMA for the URLLC Multi-User MIMO Downlink
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 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{3 6 0}$</tex>–degree fullplane coverage, while RSMA provides a prominent gain by efficiently managing interference. Numerical results reveal a strong synergy between RSMA and STAR-RIS, demonstrating significant EE gains over reflective RIS and spatial division multiple access (SDMA).
Authors
- Eduard A. Jorswieck (ORCID: https://orcid.org/0000-0001-7893-8435)
- Robert Schober (ORCID: https://orcid.org/0000-0002-6420-4884)
- Ignacio Santamarı́a (ORCID: https://orcid.org/0000-0003-0040-7436)
- Mohammad Soleymani (ORCID: https://orcid.org/0000-0003-2770-7236)
- Lajos Hanzo (ORCID: https://orcid.org/0000-0002-2636-5214)
Institutions
- Universidad de Cantabria (ES)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (DE)
- Paderborn University (DE)
- University of Southampton (GB)
- Technische Universität Braunschweig (DE)
Publication Details
- Published
- 2025-09-16
- DOI
- https://doi.org/10.1109/wsa65299.2025.11202796
- Primary Topic
- Advanced Wireless Communication Technologies
- Type
- article
- Field-Weighted Citation Impact
- 0.00