A True-Time-Delay Array Architecture for Wideband Multi-Beam Tracking  

作　　者：Xiaowei Liu Guangliang Ren 

机构地区：[1]State Key Laboratory of Integrated Service Networks,Xidian University,Xi’an 710071,China

出　　处：《China Communications》2023年第8期65-77,共13页中国通信（英文版）

基　　金：supported by the foundation of National Key Laboratory of Electromagnetic Environment(Grant No.202103012).

摘　　要：The true-time delay(TTD)units are critical for solving beam squint and frequency selective fading inWideband Large-Scale Antenna Systems(LSASs).In this work,we propose a TTD array architecture for wideband multi-beam tracking that eliminates the beam squint phenomenon and filters out interference signals by applying a spatial filter and time delay estimations(TDEs).The paper presents a novel approach to spatial filter design by introducing a transformation matrix that can optimize the beam response in a specific direction and at a specific frequency.Using the variable fractional delay(VFD)filters,we propose a TDE algorithm with a Newton-Raphson iteration update process that corrects the arrival time delay difference between sensors.Simulations and examples have demonstrated that the proposed architecture can achieve beam tracking within 10 ms at the low signalto-noise ratio(SNR)and demodulation loss is less than 0.5 dB in wideband multi-beam scenarios.

关 键 词：true-time delay(TTD) spatial filter variable fractional delay(VFD) wideband multi-beam tracking time delay estimation(TDE) 

分 类 号：TN927.2[电子电信—通信与信息系统] TN820[电子电信—信息与通信工程]