Study On Anti-collision Algorithm Of Chipless RFID Tags

Radio frequency identification technology can achieve non-contact information transmission, and promote the rapid development of the internet of things. It has the advantages of fast reading, strong penetrability, small volume, etc. Chipless RFID becomes the hotspots depend on cheapness, low power consumption, etc. This paper studies on the anti-collision of chipless RFID tags.Based on the matrix pencil method, this paper studies a cross correlation matrix pencil method. The experimental results show that the extracted poles still have high accuracy by using the cross correlation matrix pencil method when SNR is 5d B. On this basis, a sliding window matrix pencil algorithm is studied, and it separates the late-time response from the scattered field. At the same time, the turn-on time of late-time response is obtained. The problem of estimating the early-time response when extracting poles by the matrix pencil method is solved.Three anti-collision algorithms of chipless tags are studied. In the first case, the scattered field of each tag to reach the reader has a time difference, so using the sliding window matrix pencil method to identify each tag. This algorithm has stronger anti-noise ability than the short time matrix pencil method under the same condition. In the second case, the time of each tag's scattered field to reach the reader is nearly identical, and the radar cross section curves' magnitudes are used to identify them. It remedies the first algorithm, but its noise immunity is not well. In the last case, the frame protocol is proposed by using frequency band division. It can effectively solve the problem of multi-tag identification, but the design of the tag is difficult.In the end, round slotted tag is tested and the maximum deviation between the measured frequency and the theoretical simulation resonant frequency is 0.3GHz. It can verify the reliability of the design based on pole method.