The Design Of Baseband Circuit In RFID Reader Based On ISO/IEC18000-6B/6C And The Research Of Anti-collision

RFID (Radio Frequency Identification, RFID) technology is a kind of automatic Identification technology, it through wireless radio frequency to achieve fast read and write RFID tags, and can be used for multi-objective and moving target recognition, and Internet technologies can also items worldwide tracking and information sharing, with a wide range of applications. At present the RFID has become an important research fields at home and abroad. But as a new application technology, RFID applications are still some deficiencies such as:the low accuracy of identification i RFID standardization process is slow, etc. Among them, Among them, the tag and reader collision caused the collision efficiency of tag identification RFID technology is not high is one of the most important. Research rapid, accurate, effectively prevent collision solution already become a very significant issue, the development of its RFID technology has a vital role.This thesis by understanding the RFID technology research background, the domestic and foreign development status and technical trends of the foundation, on the ISO18000-6C6B and two agreements are analyzed and compared, and a deep research on the digital belt circuit RFID and prevent collision algorithm.This paper ISO18000-6B/6C based on two agreement reader baseband processing circuit was studied, and the processing circuits of baseband studied several main module design. Baseband processing circuit’s main by modulation and demodulation module, code modules and decoding module, leading module code/frame synchronization yards module, the CRC check module, forming filter modules, control module, of which mainly introduces four kinds of module design. After the sender, according to the agreement is different, use different coding mode:6B6C adopted by Manchester coding, the PIE coding.This thesis was to all sorts of prevent collision algorithm is studied. Prevent collision algorithm ALOHA algorithm and basically has two kinds of binary search algorithm this and their improved algorithm. The RFID system, is now the worship prevent collision method basically has time buttress ALOHA algorithm and binary search algorithm, ISO18000-6agreement are mentioned methods. Both methods belong to a time road method (TDMA). This paper ALOHA algorithm, time buttress pure ALOHA algorithm, fixed frame time buttress ALOHA algorithm, dynamic frame time buttress ALOHA algorithm, binary search algorithm and dynamic binary search algorithm was introduced. This paper also ALOHA algorithm based on the time frame of the improved algorithm (Q). At the end of the frame, the algorithm through the inspection mechanism carries on the Q value update. Because improved each inventory cycle qq algorithm of the frame size will automatically be take a optimal value and reduced the time needed to total identification number and cycle number. Simulation results show that the Q algorithm improved the Q than Type C standard more effective. Algorithm...