Beyond Diagonal Reconfigurable Intelligent Surfaces: A Multi-Sector Mode Enabling Highly Directional Full-Space Wireless Coverage

Reconfigurable intelligent surface (RIS) has gained much traction due to its potential to manipulate the propagation environment via nearly-passive reconfigurable elements. In our previous work, we have analyzed and proposed a beyond diagonal RIS (BD-RIS) model, which is not limited to traditional d...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2023-08, Vol.41 (8), p.1-1
Main Authors: Li, Hongyu, Shen, Shanpu, Clerckx, Bruno
Format: Article
Language:English
Subjects:
Algorithms
Analytical models
Antennas
Array signal processing
Beamforming
Beyond diagonal reconfigurable intelligent surface (BD-RIS)
Channel models
full-space coverage
highly directional beam
Impedance
Integrated circuit modeling
multi-sector mode
Multiuser systems
Performance enhancement
Reconfigurable intelligent surfaces
Scaling laws
Scattering
Wireless communication
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Summary:Reconfigurable intelligent surface (RIS) has gained much traction due to its potential to manipulate the propagation environment via nearly-passive reconfigurable elements. In our previous work, we have analyzed and proposed a beyond diagonal RIS (BD-RIS) model, which is not limited to traditional diagonal phase shift matrices, to unify different RIS modes/architectures. In this paper, we create a new branch of BD-RIS supporting a multi-sector mode. A multi-sector BD-RIS is modeled as multiple antennas connected to a multi-port group-connected reconfigurable impedance network. More specifically, antennas are divided into L ( L ≥ 2) sectors and arranged as a polygon prism with each sector covering 1/ L space. Different from the recently introduced concept of intelligent omni-surface (or simultaneously transmitting and reflecting RIS), the multi-sector BD-RIS not only achieves a full-space coverage, but also has significant performance gains thanks to the highly directional beam of each sector. We derive the constraint of the multi-sector BD-RIS and the corresponding channel model taking into account the relationship between antenna beamwidth and gain. With the proposed model, we first derive the scaling law of the received signal power for a multi-sector BD-RIS-assisted single-user system. We then propose efficient beamforming design algorithms to maximize the sum-rate of the multi-sector BD-RIS-assisted multiuser system. Simulation results verify the effectiveness of the proposed design and demonstrate the performance enhancement of the proposed multi-sector BD-RIS.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2023.3288251