Hybrid near- and far-field three-stage beam training with beam split for RIS-assisted OFDM communications

作     者：Zhichao CHENG Shupei ZHANG Shu FU Boya DI Zhichao CHENG;Shupei ZHANG;Shu FU;Boya DI

作者机构：School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication Systems and NetworksSchool of ElectronicsPeking UniversityBeijing 100871China Department of Microelectronics and Communication EngineeringChongqing UniversityChongqing 400044China 

出 版 物：《Frontiers of Information Technology & Electronic Engineering》 (信息与电子工程前沿(英文版))

年 卷 期：2024年第25卷第12期

页      面：1664-1678页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

基　　金：Project supported by the Natural Science Foundation of Beijing Municipality,China(Nos.QY23039,4222005,and L212027) the National Natural Science Foundation of China(Nos.62322101,62227809,and 62271012) 

主　　题：Near-far field Beam split Codebook design Beam training Reconfigurable intelligent surfaces 

摘      要：With the development of millimeter-wave(mmWave)communication systems,large-scale reconfigurable intelligent surfaces(RISs)have gained considerable attention as a promising technology for signal strength enhancement and coverage ***,as the antenna scale and bandwidth increase,RIS-assisted wideband orthogonal frequency division multiplexing(OFDM)communication systems face challenges due to the near-field range expansion and the beam split effect over the high-frequency band,complicating the acquisition of channel state information(CSI).To tackle these challenges,we present a codebook-based three-stage beam training scheme by using the beam split effect to bypass CSI ***,by analyzing the beam split effect in RIS-assisted OFDM communication systems,we propose a beam-split-aware codebook capable of covering both the near and far fields with fewer codewords compared to conventional narrow-band *** such a codebook,a three-stage beam training mechanism is adopted to obtain the optimal codeword with low time overhead,thereby facilitating subsequent *** results demonstrate that the proposed scheme outperforms existing near-and far-field codebook-based schemes in terms of the beam training resolution and sum rate in the hybrid near–far field.