Characterization of Indoor RIS-Assisted Channels at 304 GHz: Experimental Measurements, Challenges, and Future Directions

作     者：Alexandropoulos, George C. Jung, Bo Kum Gavriilidis, Panagiotis Matos, Sérgio Loeser, Lorenz H.W. Elesina, Varvara Clemente, Antonio D’Errico, Raffaele Pessoa, Luís M. Kürner, Thomas 

作者机构：The Department of Informatics and Telecommunications National and Kapodistrian University of Athens Athens15784 Greece The Department of Electrical and Computer Engineering University of Illinois Chicago ChicagoIL60601 United States The Institute for Communications Technology Technische Universität Braunschweig Braunschweig38106 Germany  Lisbon1649-026 Portugal CEA-Leti MINATEC Campus Grenoble38054 France Universite Grenoble Alpes France INESC TEC The Faculty of Engineering University of Porto Campus da FEUP Porto4200-465 Portugal 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Velocity measurement 

摘      要：Reconfigurable Intelligent Surfaces (RISs) are expected to play a pivotal role in future indoor ultra high data rate wireless communications as well as highly accurate three-dimensional localization and sensing, mainly due to their capability to provide flexible, cost- and power-efficient coverage extension, even under blockage conditions. However, when considering beyond millimeter wave frequencies where there exists GHz-level available bandwidth, realistic models of indoor RIS-parameterized channels verified by field-trial measurements are unavailable. In this article, we first present and characterize three RIS prototypes with 100×100 unit cells of half-wavelength inter-cell spacing, which were optimized to offer a specific non-specular reflection with 1-, 2-, and 3-bit phase quantization at 304 GHz. The designed static RISs were considered in an indoor channel measurement campaign carried out with a 304 GHz channel sounder. Channel measurements for two setups, one focusing on the transmitter-RIS-receiver path gain and the other on the angular spread of multipath components, are presented and compared with both state-of-the-art theoretical models as well as full-wave simulation results. The article is concluded with a list of challenges and research directions for RIS design and modeling of RIS-parameterized channels at THz frequencies. © 2024, CC BY-NC-ND.