Design Of Anti-collision Algorithm In RFID System And Its Implementation Study

Radio Frequency Identification(RFID) is a contactless identification technology which is developing rapidly in recent years.In RFID application system,RFID tag is of great attention because of its non-contact,low-power and low-cost advantages,but wether it would be applied largedly depend on the solution of multi-tag data collision,so the paper choose to study the design of anti-collision algorithm and its implementation.The paper first analyze the implementation theory of anti-collision algorithm based on time-slotted aloha from mathematic model, then deep into study and analyze the tag number estimation and frame size adjustment these two key technologies used in project,especially in time-slotted anti-collision algorithm and adaptive adjustment anti-collision algorithm.second, the paper establish models for all algorithm projects in matlab, simulate and analyze the system performance,then compare and sum-up each advantages ;third,in order to implement Philip I-CODEl's anti-collison algorithm,we design many modules in tag such as ppm-decode module,crc verification module,slot-generate module,state control module etc ,and also design ppm-encode module and anti-collision detect module in reader;finally,we put together all modules to see the system performance through function simulation,then use ISE 9.1i to compile,place-and-route and download into XILINX's virtex-5 fpga to verify whether the system achieve anti-collision.Through the simulation and verification, the results show that the design of anti-collision algorithm and its implementation basically meet the requirements in our paper. The main innovation in our design is: Give the optimization solution to the tag number estimation and frame size adjustment these two key processes in anti-collision algorithm ,and implement the design of slotted anti-collision algorithm which can be verify in FPGA.