SARIS: Scattering Aware Reconfigurable Intelligent Surface Model and Optimization for Complex Propagation Channels

Mursia, Placido; Phang, Sendy; Sciancalepore, Vincenzo; Gradoni, Gabriele; Di Renzo, Marco

Abstract

The reconfigurable intelligent surface (RIS) is an emerging technology that changes how wireless networks are perceived, therefore its potential benefits and applications are currently under intense research and investigation. In this letter, we focus on electromagnetically consistent models for RISs inheriting from a recently proposed model based on mutually coupled loaded wire dipoles. While existing related research focuses on free-space wireless channels thereby ignoring interactions between RIS and scattering objects present in the propagation environment, we introduce an RIS-aided channel model that is applicable to more realistic scenarios, where the scattering objects are modeled as loaded wire dipoles. By adjusting the parameters of the wire dipoles, the properties of general natural and engineered material objects can be modeled. Based on this model, we introduce a provably convergent and efficient iterative algorithm that jointly optimizes the RIS and transmitter configurations to maximize the system sum-rate. Extensive numerical results show the net performance improvement provided by the proposed method compared with existing optimization algorithms.

• Journal Article Type: Article
• Acceptance Date: Jul 19, 2023
• Online Publication Date: Jul 27, 2023
• Publication Date: 2023-11
• Deposit Date: Jul 28, 2023
• Publicly Available Date: Aug 10, 2023
• Journal: IEEE Wireless Communications Letters
• Print ISSN: 2162-2337
• Electronic ISSN: 2162-2345
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Issue: 11
• Pages: 1921-1925
• DOI: https://doi.org/10.1109/lwc.2023.3299304
• Keywords: Load modeling, Scattering, Wires, Transmitters, Receivers, Optimization, Mutual coupling, Reconfigurable intelligent surfaces, dynamic metasurfaces, loaded wire dipoles, mutually coupled antennas, scattering objects, discrete dipole approximation
• Public URL: https://nottingham-repository.worktribe.com/output/23488819
• Publisher URL: https://ieeexplore.ieee.org/document/10195937