Design And Implementation Of Digital Baseband For UHF RFID Interrogator Based On ISO18000₆C Protocol

RFID is short for Radio Frequency Identification. It is a new automatic identification technology for the object identification through electromagnetic waves. The method features very high security and high speed. Moreover, the process of identification need not be intervened manually, and it is able to identify moving targets and multi targets. As a result, RFID is becoming more and more popular in the wireless communication system. The most important thing is that RFID technology can be connected with the internet and form a thing to thing net. In this way, we can control and share all the information of the relative things around the world. So the research of RFID is very meaningful for the information society.In this thesis, on the basis of the relative technologies of RFID,we realize the research and design of the UHF RFID interrogator digital baseband system based on ISO18000₆C protocol. Besides, the software simulation and the FPGA verification have been finished.The main work of this thesis is as below:1,After introducing RFID principles briefly, we analyze the ISO18000₆C protocol in detail and propose the structure of UHF RFID interrogator digital baseband system based on ISO18000₆C protocol.2,Focuses on the anti-collision algorithm of the digital baseband system. On the basis of analyzing several ALOHA algorithms, a new anti-collision algorithm is proposed. The simulation indicates that this algorithm can improve system efficiency.3,The design of each module in digital baseband system is expounded. Then we use VHDL language to achieve the design. For the PIE encoding module, the efficient finite state machines is used to implement; for the FM0 decoding module, we use shift register, which consume less memory compared with other ways. The two methods improve the data processing speed. Besides, the control unit makes the each module work orderly, which drivers the modules effectively.4,At the end of this thesis, we first use Quartus II(V7. 2) tool for software simulating. The report of synthesis and static timing analysis are given. Then the design is downloaded into FPGA development platform. And the result of verifying is consistent with the theory. Finally, the digital baseband system is combined with the radio frequency module to achieve the communication between the interrogator and tags.