Synergizing Beyond Diagonal Reconfigurable Intelligent Surface and Rate-Splitting Multiple Access

This work focuses on the synergy of rate-splitting multiple access (RSMA) and beyond diagonal reconfigurable intelligent surface (BD-RIS) to enlarge the coverage, improve the performance, and save on antennas. Specifically, we employ a multi-sector BD-RIS modeled as a prism, which can achieve highly...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2024-08, Vol.23 (8), p.8717-8729
Main Authors: Li, Hongyu, Shen, Shanpu, Clerckx, Bruno
Format: Article
Language:English
Subjects:
Antennas
Beyond diagonal reconfigurable intelligent surface
Communications systems
Covariance matrices
Multiaccess communication
Multiple access
Quality of service
rate-splitting multiple access
Reconfigurable intelligent surfaces
Robust design
Splitting
Stochastic processes
Symmetric matrices
Transmission line matrix methods
Wireless communication
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Summary:This work focuses on the synergy of rate-splitting multiple access (RSMA) and beyond diagonal reconfigurable intelligent surface (BD-RIS) to enlarge the coverage, improve the performance, and save on antennas. Specifically, we employ a multi-sector BD-RIS modeled as a prism, which can achieve highly directional full-space coverage, in a multiuser multiple input single output communication system. With the multi-sector BD-RIS aided RSMA model, we jointly design the transmit precoder and BD-RIS matrix under the imperfect channel state information (CSI) conditions. The robust design is performed by solving a stochastic average sum-rate maximization problem. With sample average approximation and weighted minimum mean square error-rate relationship, the stochastic problem is transformed into a deterministic one with multiple blocks, each of which is iteratively designed. Simulation results show that multi-sector BD-RIS aided RSMA outperforms space division multiple access schemes. More importantly, synergizing multi-sector BD-RIS with RSMA is an efficient strategy to reduce the number of active antennas at the transmitter and the number of passive antennas in BD-RIS.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2024.3353596