基于太赫兹智能反射面波束色散和分裂的快速感知方法  

Fast Sensing Method Based on Beam Squint and Beam Split of Terahertz Reflective Intelligent Surfaces

作　　者：郝万明[1,2] 杨兰 朱政宇 李兴旺[3] HAO Wanming;YANG Lan;ZHU Zhengyu;LI Xingwang(School of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China;School of Physics and Electronic Information Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]郑州大学电气与信息工程学院,郑州450001 [2]东南大学移动通信全国重点实验室,南京210096 [3]河南理工大学物理与电子信息学院,焦作454000

出　　处：《电子与信息学报》2025年第3期678-686,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62471440);东南大学移动通信全国重点实验室开放研究基金(2024D12)。

摘　　要：针对太赫兹智能反射面(RIS)系统中基于波束扫描感知耗时较长问题,该文提出一种基于太赫兹RIS波束色散和分裂的快速感知方法。通过在每个RIS元件处部署实时延(TTD)以动态调整波束色散程度,设置大阵列RIS单元间距以形成波束分裂效应,进而联合波束色散和分裂实现目标区域快速感知。具体地,将感知区域分为多个子区域,并基于RIS波束色散优化TTD和RIS反射元件相移,以覆盖单一子区域。同时,利用波束分裂无缝覆盖多个子区域,相比使用单一波束扫描感知显著降低了时间开销。而后,为减少回波信号路径损耗,在RIS处配置主动感知元件,用于直接接收并分析回波信号。在此基础上,推导出感知目标角度估计值及其均方根误差(RMSE)。仿真结果表明了所提快速感知方案的有效性。Objective Reflecting Intelligent Surface(RIS)-aided Terahertz(THz)communications are considered a key technology for future Sixth-Generation(6G)mobile communication systems addressing issues such as signal attenuation and Line-of-Sight(LoS)link blockage issues,due to their ultra-large bandwidth and low power consumption.However,the frequency independent characteristics of RIS elements can cause beam squint effects,where beams of different carriers are directed at different angles.Although this reduces the beam gain received by users,it can be leveraged to enhance sensing capabilities in sensing applications.Specifically,beam squint allows for simultaneous sensing of a target using multiple carrier beams directed in different directions.Existing studies have explored beam squint for beam training.For example,by studying near-field beam squint and True Time Delay(TTD)to generate beams that focus at multiple positions across different frequencies,enabling rapid beam training with reduced overhead.Additionally,combining TTD with beam squint and beam split for sensing extends the beam coverage area and enables the quick acquisition of user locations through feedback.However,there is no research on jointly utilizing beam squint and beam split for sensing in RIS-assisted THz systems.This paper aims to conduct detailed research on the use of beam squint for sensing in such systems.Methods To address the time-consuming issue of beam scanning in RIS-assisted THz systems,a fast sensing method based on RIS beam squint and split effects is proposed.Each RIS element is equipped with a TTD mechanism to dynamically adjust the degree of beam squint,while the large array RIS units are spaced to induce the beam split effect.By combining beam quint and beam split,the method enables rapid sensing of the target area.Specifically,the sensing area is divided into multiple sub-areas,with the TTD and the phase shift at the RIS elements optimized to cover each sub-area based on beam squint.The beam split effect is then used to seamlessly c

关 键 词：太赫兹 智能反射面 波束色散 波束分裂 快速感知 

分 类 号：TN92[电子电信—通信与信息系统]