@inproceedings{14f803fec9a64c069dd4178335add1cc,
title = "Beamforming on Reconfigurable Intelligent Surface: A Codebook Design for Spatial Coverage with Beam Squint Effect",
abstract = "In this paper, we propose a novel reconfigurable intelligent surface (RIS) codebook design by leveraging beam squint with the help of half-power beamwidth (HPBW) concept. In particular, the beam squint effect incurs the array responses' direction change of RIS under different frequencies. We aim to design the RIS phase shifts such that the beams with squint generated by different RIS weights could tile over the entire spatial domain of the RIS without overlapping. To quantify the spatial coverage performance in wideband systems, a new term - wideband-HPBW (W-HPBW), is introduced based on the definition of HPBW. The closed-form expression of the angular information of W-HPBW is derived. To further reduce RIS weights switching and realize lower pilot overhead in channel estimation, a beam broadening technique is then investigated. This design largely reduces the times of RIS phase adjustments and the requirement for accurate channel estimation. Simulation results show that the designed codebook can effectively realize spatial coverage under the W-HBPW criterion.",
keywords = "Reconfigurable intelligent surface, beam broadening technique, beam squint, wideband system",
author = "Xinyi Lin and Yihong Liu and Lei Zhang and Anvar Tukmanov and Qammer Abbasi and Imran, \{Muhammad Ali\}",
note = "Publisher Copyright: {\textcopyright} 2023 IEEE.; 2023 IEEE International Conference on Communications Workshops, ICC Workshops 2023 ; Conference date: 28-05-2023 Through 01-06-2023",
year = "2023",
doi = "10.1109/ICCWorkshops57953.2023.10283606",
language = "English",
series = "2023 IEEE International Conference on Communications Workshops: Sustainable Communications for Renaissance, ICC Workshops 2023",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "1130--1135",
booktitle = "2023 IEEE International Conference on Communications Workshops",
address = "United States",
}