Research On RFID Anti-Collision Algorithm

Radio Frequency Identification (RFID), as a speedy, real-time, accurate information collection and processing of high-tech and information based on standardized, which has been ranked as one of the most ten important technologies in this century. It can be widely used in all kinds of field. This is because RFID has the advantage of non-contact, and can bring the data more than the traditional bar code. However, as the application of an emerging technology, there are still a number of shortcomings in RFID's applications such as: recognition accuracy is not high, RFID's standardization process is slow. Among them, one of the most important issues in RFID system is its inefficient recognition by tag collision and reader collision. It is a very significant issue to research on rapid, accurate, and effective anti-collision solution, which has a vital role in the development of RFID's technology.In this paper, the basic principles, structure, characteristics, and the relevant theoretical knowledge of the radio frequency identification technology are introduced. Especially, we have done an in-depth research on the data transmission in the issue of anti-collision. This thesis focuses on the Anti-Collision algorithms of the RFID system. There are several effective Anti-Collision algorithms, which are used in all kinds of RFID systems. In order to resolve the tag collision problem, we need to use multiple access protocol. Recent years, the time division multiple (TDMA) has being generally accepted. According to TDMA, there are ALOHA protocol and Binary tree Protocol. This paper analyzes its characteristics and shortcomings.RFID have been used widely. Especially in Low-frequency Radio Frequency Identification Technology area. On the other hand, The High-frequency Radio Frequency Identification has not been well developed. With the development of the RFID technology, it is time to research the area of High-frequency. In this paper, I suggest two methods of the anti-collision algorithms used of the high-frequency RFID, which are suit for tag's backscatter transmitted signal. The author has done a deeply research on the issue of the labeling anti-collision based on the amount of domestic and international literature search, collating, analysis and synthesis.In this paper, the innovation is made of two types of anti-collision algorithm based of CDMA. One is based on spread-spectrum ALOHA anti-collision algorithm. This algorithm is based on the original ALOHA mechanism of anti-collision algorithm, combined with the spread spectrum code division multiple access technology characteristics of the formation, while the introduction of LS code, making this algorithm has broadband transmission, anti-fading ability, small-signal interference higher system throughput, simple and easy to achieve. The other is a reservation-based CDMA ALOHA anti-collision algorithm. In this paper, The Markov model of the algorithm is given. This algorithm is based on code division multiple access technology, combined with ALOHA reservation mechanism of the formation of the competition. In this algorithm, the uplink channel is divided into code-division multiple independent channels, each code-division ALOHA channel by appointment with the competition mechanism, making this algorithm with anti-fading ability, confidentiality, and system throughput advantages. The article also carried out on two algorithms of mathematical analysis and the throughput of the system MATLAB's simulation. Finally the experimental results and conclusion are given.