On Differentiation Among Pilot Signals of Multiple Mobile Targets in Retro-Reflective Beamforming for Wireless Power Transmission

作     者：Xin Wang Long Li Tie Jun Cui Mingyu Lu Xin Wang;Long Li;Tie Jun Cui;Mingyu Lu

作者机构：School of Electrical EngineeringChongqing UniversityChongqing 400044China School of Electronic EngineeringXidian UniversityXi’an 710071China State Key Laboratory of Millimeter WavesSchool of Information Science and EngineeringSoutheast UniversityNanjing 210096China Department of Electrical and Computer EngineeringWest Virginia University Institute of TechnologyBeckleyWV 25801USA 

出 版 物：《Engineering》 (工程（英文）)

年 卷 期：2023年第30卷第11期

页      面：55-62页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 

基　　金：supported in part by the National Natural Science Foundation of China(61871220) the Natural Science Foundation of Jiangsu Province(BK20201293)。 

主　　题：Wireless power transmission Microwave antenna array Retro-reflective beamforming Pilot signal Multiple access 

摘      要：An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers(referred to herein as“targets).The experimental results demonstrate that,when multiple targets broadcast continuous-wave pilot signals at respective frequencies,a retro-reflective wireless power transmitter is capable of generating multiple wireless power beams aiming at the respective targets as long as the multiple pilot signals are explicitly separated from one another by the wireless power transmitter.However,various practical complications are identified when the pilot signals of multiple targets are not appropriately differentiated from each other by the wireless power transmitter.Specifically,when multiple pilot signals are considered to be carried by the same frequency,the wireless power transmission performance becomes heavily dependent on the interaction among the pilot signals,which is highly undesirable in practice.In conclusion,it is essential for a retro-reflective wireless power transmitter to explicitly discriminate multiple targets’pilot signals among each other.