The Research On Anti-collision Algorithm In Wireless Radio Frequency Identiifcation Devices System

With the rapid development of the Internet of Things technology，wireless radiofrequency identification devices get more and more applications，the correspondingradio frequency identification technology is gaining more in-depth study，so，as thetypical applications of RFID technology，radio frequency identification systemsget more and more applications．The basic principles of the radio frequencyidentification systems is uses the transmission characteristics of the RF signal andthe spatial coupling (inductive or electromagnetic coupling) automatic identificationof the target object，but in the actual process of radio frequency identification, whenthere are multiple electronic tag enters the read range，it will launch to readerrequests at the same time，this will lead to the collision of the channel，resulting infast ID identifies serious，serious and even cause the electronic tag can not beidentified．Therefore，how reasonable arrangements to channel resources to preventthe conflict of the collision of the label (Anti-the Collision Algorithm) is animportant aspect of RFID research．This article through the establishment of the abstract model of the radiofrequency identification system，and clarify the interaction and information flow ofinformation between the members of the system，on the basis of some of the existingRFID anti-collision algorithm，adding a multi-state，the scrambling code，encrypt thechannel address and hopping mechanism to resolve the conflict in the reader and thecard or label in the communication process of identification or collision．The mainwork of this paper is as follows：(1) Analyze of the characteristics of the RFID system，the history of thedevelopment，trends and applications，complete establish abstract model of the radiofrequency communication system，and clear system of the reader and the card orlabel collision conflict in a variety of situations；(2) Analyze the general solution of the conflict in the system of the reader andthe card or label in the collision，as well as their respective advantages anddisadvantages of communication in the recognition process;(3) For the current problem of "starving to death" and the query process isrelatively complicated，require relatively higher performance of the label exists inthe current RFID anti-collision algorithm，improved the BIBD encoding of RFIDanti-collision algorithm program，and from these three aspects of the algorithms background，detailed process design and simulation of algorithms described itsprinciple，the experimental proved the effectiveness of the improved algorithm bycompared to and the rest of algorithms ;(4) According to the present the problem of shortage of RFID system security ,put forward mailing address encryption technology based on the FM mechanism tosolve RFID collision problem solutions，and set up a test environment to prove theFM mechanism for anti-collision validity of the collision function.