Research On RFID Anti-collision Technology

Radio Frequency Identification (RFID) technology as a rapid, real-time, accurate information gathering and processing of high-tech and information on the basis of standardization has been recognized as one of the top ten key technologies in production, retail, logistics and transport, this wide range of applications in various industries prospects. As RFID technology continues to evolve, and the combination of short-distance wireless communication has become a research hotspot.In this paper, the existing passive RFID anti-collision algorithms have some weaknesses, Both probabilitistic ALOHA and deteministic anti-collision algorithm are studied for improving the anti-collision algorithm as follows:1 .This thesis describes a passive UWB-RFID system and introduce the structure of system and the critical module in design. firstly, the basic concepts of RFID development prospects, principle, related theories, key technologies are simply introduced. And then one of the key technologies - which focus on the anti-collision algorithm is introduced. we intergrate several existing anti-collision algorithms, the algorithm's performance and characteristics are summarized.2.Based on probabilitisticALOHA anti-collision algorithm,we put out new anti-collision algorithms called AUARC using UWB multiple detection. The algorithm combines multiple detection technologies and the dynamic allocation of slots to reduce the collision rate. Experimental results show that the system identification algorithm AURAC efficiency of 0.7 or above, compared with the existing probabilistic anti-collision algorithm has higher recognition efficiency.3. Anti-collision algorithms based on query tree algorithm have low efficiency when large num of tags apprear.This paper presents an improved anti-collision algorithm for the query tree. The algorithm of the ID information is split, with parallel query a way to enhance system survivability, experiments show that the proposed algorithm compared with the existing query tree anti-collision algorithm double the identifying rate, optimize the system performance well.In this paper,we investigate two types of passive RFID tag anti-collision system, and try to put forward an effective algorithm to solve the problem of tag identification, theoretical analysis and experimental results show that new algorithm can more effectively solve the corresponding problem. It has a certain theoretical value and application value RFID technology for advancing the theoretical study and practical application.