| Radio Frequency Identification (RFID) is a non-contact and automaticidentification technology which uses spatial electromagnetic field as a medium toexchange information. RFID technology, the core technology on the Internet, has manyadvantages such as fast, stable and non-line-of-sight read, and it has been widely used inproduction and our life. Due to its non-contact property, RFID technology faces theproblem of information interference when the system is doing multi-target identification.The problem will not only lead to the low efficiency of system, but also has thepossibility to make the whole system crash. With the rapid development of theinformation age, the multi-target recognition technology has been used widely. It isnecessary for us to solve the problem of information interference in doing multi-targetidentification, and it will have a strategic significance for the promotion of informationdevelopment and multi-target interconnection.This paper, at first, describes the working principle and performance ofanti-collision algorithm. After analyzing the existing ALOHA algorithm and binaryalgorithm the author found that there are still many disadvantages in these twoalgorithms. In order to solve these disadvantages, the author proposes an improvedanti-collision algorithm. That is using the queuing method to let the tag enter the slot,making the number of reader intra tag equals the number of slots,in this way, the readerkeeps the maximum work efficiency. The length of the timeslot is limited, and thelength of the frame is selected. When testing the label within the slot, the scheme use amethod that combines the time domain with code domain to detect the label in the slot.The improved algorithm is confirmed through simulating on MATLAB software. Thesimulation results show that the improved algorithm not only reduces the tag collisionsbut also reduce the number of time slots, and improves the efficiency of the system. |
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