Impact of Reconfigurable Intelligent Surface Geometry on Communication Performance

• Published in: IEEE wireless communications letters Vol. 12; no. 5; pp. 898 - 902
• Main Authors: Cui, Zhuangzhuang, Pollin, Sofie
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.05.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Beamforming; Geometric structure; Geometry; outage probability; Power system reliability; Probability; reconfigurable intelligent surface; Reconfigurable intelligent surfaces; Rician channels; Signal to noise ratio; Surface geometry; Three-dimensional displays; Topology; Wireless communication
• ISSN: 2162-2337; 2162-2345
• DOI: 10.1109/LWC.2023.3248792

When beamforming is applied at the transmitter, only part of reconfigurable intelligent surfaces (RISs) might be active, and it becomes indispensable to study the impact of RIS geometry. This letter aims at evaluating RIS geometry, ranging from linear (1D), and planar (2D), to cylindrical (3D) structures. We first derive the effective illuminated elements of different RIS topologies and determine the resulting signal-to-noise ratio (SNR) and outage probability. Then, we investigate the optimal RIS location to trade off active area versus received power considering near-field propagation. Numerical results quantify the benefit of RIS geometric compactness and provide their applicable ranges.