Activation Distance and Capacity Analysis for Ambient Backscatter Communications with Sensitivity Constraint and Beamforming  

作　　者：Mu Yunping Fan Dian Wang Gongpu Xu Yongjun Kuang Lei 

机构地区：[1]Engineering Research Center of Network Management Technology for High Speed Railway of Ministry of Education,School of Computer and Information Technology,Beijing Jiaotong University,Beijing 100044,China [2]China Academy of Information and Communications Technology,Beijing 100191,China [3]School of Communication and Information Engineering,Chongqing University of Posts and Telemcommunications,Chongqing 400065,China [4]Shanghai Key Laboratory of Multidimensional Information Processing,Engineering Center of SHMEC for Space Information and GNSS,School of Information Science and Technology,East China Normal University,Shanghai 200241,China

出　　处：《China Communications》2024年第11期257-266,共10页中国通信（英文版）

基　　金：supported by National Natural Science Foundation of China(No.62101601);the Fundamental Research Funds for the Central Universities under Grant 2020JBM017;Joint Key Project of National Natural Science Foundation of China(No.U22B2004)。

摘　　要：Circuit sensitivity of sensors or tags without battery is one practical constraint for ambient backscatter communication systems.This letter considers using beamforming to reduce the sensitivity constraint and evaluates the corresponding performance in terms of the tag activation distance and the system capacity.Specifically,we derive the activation probabilities of the tag in the case of single-antenna and multi-antenna transmitters.Besides,we obtain the capacity expressions for the ambient backscatter communication system with beamforming and illustrate the power allocation that maximizes the system capacity when the tag is activated.Finally,simulation results are provided to corroborate our proposed studies.

关 键 词：activation distance ambient backscatter communications beamforming channel capacity power allocation sensitivity 

分 类 号：TN926[电子电信—通信与信息系统]