Performance Research Of Tag Anti-collision Algorithms For UHF RFID System

As a new long-distance identification technology,radio frequency identification(RFID)technology has incomparable advantages in security,environmental requirements,identification distance,identification quantity and other aspects compared with traditional barcode identification,optical feature identification,smart card identification and other technologies.In practical applications,although RFID technology has obvious advantages,the collision of multiple tags always restricts the efficiency of the RFID system.Therefore,an RFID anti-collision algorithm with high throughput and low traffic is of great significance for improving the performance of the entire RFID system.This dissertation first explains the structure,working principle and standard system of the RFID system,and introduces and simulates the basic algorithm of the RFID system;then for the CTT algorithm when the number of tags increases and the throughput rate decreases,a pseudo ID code tree anti-collision algorithm(IDCTT algorithm)is proposed.The algorithm uses pseudo ID codes to group the tags in the identification area.After grouping,the number of tags in each pseudo ID code is controlled within a certain range,and then the C TT algorithm is used for the tags in each pseudo ID code.The simulation results show that the throughput rate of the IDCTT algorithm has reached 58%,which is an increase of 15% compared with the CTT algorithm;afterwards,this article establishes the RFID dynamic system model RMLS for the situation that the ta g continues to move in the reader recognition area,and the similarities and differences between the RFID dynamic system and the static system are analyzed,and then the label loss phenomenon in the dynamic system based on the dynamic frame slot algorithm is analyzed in detail and four specific solutions are proposed;finally,this article aims at four solutions,proposes a new frame time slot algorithm(NFS-DS algorithm)based on dynamic scenarios,and simulation verification is carried out on the label transmission model.The simulation results show that the four measures in NFS-DS are beneficial to solve the situation of label loss,reducing the loss rate of tags in dynamic systems.