Beyond Diagonal Reconfigurable Intelligent Surfaces With Mutual Coupling: Modeling and Optimization

This work studies the modeling and optimization of beyond diagonal reconfigurable intelligent surface (BD-RIS) aided wireless communication systems in the presence of mutual coupling among the RIS elements. Specifically, we first derive the mutual coupling aware BD-RIS aided communication model usin...

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Bibliographic Details
Published in:IEEE communications letters 2024-04, Vol.28 (4), p.937-941
Main Authors: Li, Hongyu, Shen, Shanpu, Nerini, Matteo, Di Renzo, Marco, Clerckx, Bruno
Format: Article
Language:English
Subjects:
Algorithms
Artificial neural networks
Beyond diagonal reconfigurable intelligent surfaces
Computer Science
Impedance
Integrated circuit modeling
Mutual coupling
Optimization
Receiving antennas
Reconfigurable intelligent surfaces
Scattering
Signal and Image Processing
Wireless communication systems
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Summary:This work studies the modeling and optimization of beyond diagonal reconfigurable intelligent surface (BD-RIS) aided wireless communication systems in the presence of mutual coupling among the RIS elements. Specifically, we first derive the mutual coupling aware BD-RIS aided communication model using scattering and impedance parameters. Based on the obtained communication model, we propose a general BD-RIS optimization algorithm applicable to different architectures of BD-RIS to maximize the channel gain. Numerical results validate the effectiveness of the proposed design and demonstrate that the larger the mutual coupling the larger the gain offered by BD-RIS over conventional diagonal RIS.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2024.3361648