Design And Simulation For RFID Anti.Collision Algorithm Based On FPGA

Radio Frequency Identification(RFID) is a non.contact automatic identification technology.It makes use of the radio.frequency signal’s space coupling and the transmission characteristic of the reflection,and realizes the automatic identification to objects. Compared with the traditional means of identification,RFID technology has a variety of characteristics. The technology uses non.contact identification, can realize remote read and write, and it can read and write the tag information, read and write speed, it has large.capacity information storage and anti.interference ability, can read multi.label information. RFID is used in many fields, including social security, public security, finance, telecommunications, transportation, construction and public utilities, petroleum, petrochemical, organization code management.With the RFID making superior progress, RFID Anti.collision problem is becoming a hot.sport of the research in situation of many labels.In the system of RFID,at moment that many labels appear at the same time in the range of the reader identify,the data sent by labels will be in conflict with aliasing,which is that RFID anti.collision system problems,which RFID systems require a high.performance solution to the problem of anti.collision algorithm,so that the research to the system of RFID Anti.collision Algorithm has great significance in theory and reality.Firstly in this paper,we show radio frequency identification technology,the basic principles,structure,characteristics,and the basis of relevant theories of knowledge,particularly for data transmission in the anti.collision issues. Explore the characteristic of the space division multiplexing method,frequency division multiplexing method,code division multiple method,time division multiple characteristics of the respective law. This paper is on the application of innovative in FPGA for RFID anti.collision algorithm,achieve that target ISO14443standards referred to in the TYPE.A type of card on the anti.collision algorithm,on this basis we improve and optimize the "anti.dynamic binary Collision algorithm ",and carried out its programming in the use. For the TYPE.A type of card anti.collision mechanism which provided by ISO14443standards,we study the the course of the specific data exchange of "binary anti.collision algorithm".Secondly this paper studied encoded mode in data of RFID Anti.collision algorithm. Unipolarity NRZ Notreturntozero and bipolar NRZ Notreturntozero are simply introduced,this paper studies Manchester code’s specific implemetation procedure and analyses it’s dependent performance.In the end,the improved dynamical anti.collision algorithm is raised,and FPGA programming has been realized.it gives specific Manchester code’s module.It puts forwoard a modified method aiming at the rag problem.The final results show that:Compared to the basic binary algorithm,the improved "anti.collision method Dynamic binary" has the superiority on performance,and in the FPGA algorithm,it is very effective.