A Physical Layer Algorithm for Estimation of Number of Tags in UHF RFID Anti-Collision Design  

作　　者：Zhong Huang Jian Su Guangjun Wen Wenxian Zheng Chu Chu Yijun Zhang Yibo Zhang 

机构地区：[1]School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu,611731,China [2]Nanjing University of Information Science&Technology,Nanjing,210044,China [3]Shenzhen Intellifusion Technologies Co.,Shenzhen,518000,China [4]School of Foreign Languages,University of Electronic Science and Technology of China,Chengdu,611731,China [5]Department of Mechanical Engineering,University of British Columbia,Vancouver,Canada

出　　处：《Computers, Materials & Continua》2019年第7期399-408,共10页计算机、材料和连续体（英文）

基　　金：This work was supported in part by the National Natural Science Foundation of China under project contracts[NOS.61601093,61791082,61701116,61371047];in part by Sichuan Provincial Science and Technology Planning Program of China under project contracts No.2016GZ0061 and No.2018HH0044;in part by Guangdong Provincial Science and Technology Planning Program of China under project contracts No.2015B090909004 and No.2016A010101036;in part by the fundamental research funds for the Central Universities under project contract No.ZYGX2016Z011;in part by Science and Technology on Electronic Information Control Laboratory.

摘　　要：A priori knowledge of the number of tags is crucial for anti-collision protocols in slotted UHF RFID systems.The number of tags is used to decide optimal frame length in dynamic frame slotted ALOHA(DFSA)and to adjust access probability in random access protocols.Conventional researches estimate the number of tags in MAC layer based on statistics of empty slots,collided slots and successful slots.Usually,a collision detection algorithm is employed to determine types of time slots.Only three types are distinguished because of lack of ability to detect the number of tags in single time slot.In this paper,a physical layer algorithm is proposed to detect the number of tags in a collided slot.Mean shift algorithm is utilized,and some properties of backscatter signals are investigated.Simulation results verify the effectiveness of the proposed solution in terms of low estimation error with a high SNR range,outperforming the existing MAC layer approaches.

关 键 词：UHF RFID ANTI-COLLISION cluster algorithm 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]