Beam tracking based on reconfigurable intelligence surface

• Main Author: Wang, Ziyue
• Other Authors: Chau Yuen
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering; Reconfigurable intelligent surface; Code-book; Synchronization algorithm; USRP
• Online Access: https://hdl.handle.net/10356/175440
• Institution: Nanyang Technological University

Reconfigurable Intelligent Surface (RIS) is a novel technology that has emerged in recent years. Specifically, it involves the use of materials with specific electromagnetic characteristics arranged in arrays to modify signal properties such as amplitude and phase during reflection, achieving objectives like signal blind spot compensation. RIS can be utilized to enhance system performance in 6G communication systems, representing a key potential technology for 6G with substantial application prospects. The reflective beams of RIS are directional, and due to the mobility characteristics of User Equipment (UE), it is necessary to design specific algorithms for UE tracking to ensure that the beams accurately target the direction or area of the UE. Currently, popular methods for UE tracking include channel estimation, codebook-based, or AI-assisted approaches. Among these, codebook-based beam scanning, which involves scanning every possible direction in space with predesigned array code-words to select the best direction for transmission to the user, is notable. Although this method is time-consuming, it achieves high beam accuracy. The synchronization between RIS and UE during beam scanning is critical to the algorithm's performance. This dissertation has designed two synchronization algorithms applicable in engineering: passive synchronization and active synchronization, to address the synchronization issues in codebook-based beam scanning with RIS. Additionally, a complete, real communication link was established for testing, demonstrating the effectiveness of the algorithm designs.