The Research And Realization Of The Anti-collision Algorithm In The RFID System

Radio Frequency Identification (RFID) is a automatic target recognition technology usedby wireless radio frequency signal, it has some advantages like no manual intervention, fasterrecognition, non-contact identification, and it is widely used in industrial automation, logisticsand transport large-scale warehousing and other areas, with the gradual development of radiofrequency identification technology and the increasingly wide range of application areas, ithas become the most potential for development of a practical technique, but in actual use,RFID technology is still exist many development bottlenecks, such as multi-tags identifywould conflict at the same time, these issues affect RFID technology continue to development,this thesis conducted a study is based on this background.The working principle of radio frequency identification is the readers and tags use ofradio frequency signals to communicate, the reader gets information of tags via data exchange,if multiple tags communicate with readers simultaneously, tags will influence each other sothat it would appear a phenomenon that the readers can not identify correctly, this thesisstudied the anti-collision algorithm is in order to solve the conflict between the tags in thecommunication problem.This thesis first analyzes the composition of the RFID system, working principle,communication mode, coding technology, on the basis, research the anti-collision algorithmdeeply, the article detailed analysis of two common anti-collision algorithms, ALOHAalgorithm based on random and binary-based algorithm on deterministic, as well as someimproved algorithm, and its performance analysis.Based on existing theories, this thesis presents two improved anti-collision algorithm,one is based on slotted ALOHA algorithm dynamic algorithm, the improved algorithm, set athreshold value, set when the conditions are met threshold, the early termination of theexisting identification cycle, can further improve the performance of existing algorithms,another algorithm is based on two algorithms of hybrid algorithm, using an8-bit register, usedto time slot with the label to label, This algorithm first fixed-length prefix to form a certaintime slot, and then into the slot in the group to continue to label the binary tree identification,as opposed to the existing algorithms have a more rapid recognition.This article on the improved algorithm for the simulation show that improved algorithmfor improving the performance of the original algorithm has a good effect, and on this basis,an anti-collision algorithm to achieve the recognition system, and finally the insufficiency ofresearch and the future research direction of continue to work are described.