Anti-collision algorithm for frame time slot ultrahigh frequency RFID system based on blind separation

Abstract

The invention relates to an anti-collision algorithm for a frame time slot ultrahigh frequency RFID system based on blind separation. The anti-collision algorithm for the RFID system is put forward based on ICA and frame time slots according to ultrahigh-frequency radio-frequency signals ranging from 860MHz to 960MHz. According to the anti-collision algorithm, steps of an ICA algorithm in the RFID system are analyzed, an antenna system model with blind sources separated is established, the quantity of tags in each time slot is not larger than the quantity of antenna of a reader by means of specific selection of the quantity of the frame time slots, conditions of blind source separation identification tags are met, and synchronous identification can be performed on multiple tags through the ICA algorithm. A simulation result shows that compared with a traditional tag anti-collision algorithm and a blind separation and dynamic bit-slot grouping algorithm, the tag identification rate is high, identification time of the algorithm is less, and feasibility and high efficiency of the blind source separation technology applied to tag identification are verified further. The anti-collision algorithm has potential application value in the engineering field needing high efficiency and intelligent management.

Description

technical field [0001] The invention belongs to the multi-label reading technology in the communication field, and relates to a label anti-collision method. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology. Compared with traditional identification methods, it can complete information input and processing without contact, non-optical visibility, and non-manual intervention. With the advantages of convenient operation, large storage capacity, good confidentiality, short response time, and strong adaptability to the environment, it has been widely used in the fields of access control, transportation, food safety, and logistics. In the RFID communication system, there are often multiple tags coexisting within the range of the reader. If the reader sends a query command, it will cause multiple tags to respond at the same time, resulting in the response signal of the tag cannot be quickly recognized by the rea...

AI Technical Summary

Problems solved by technology

The Q algorithm can change the number of time slots by adjusting the Q value at any time in an inventory cycle, so that the unrecognized tag can reselect the response time slot and enter the response of the next frame, but the possible repeated changes of the Q value will affect The recognition efficiency of the algorithm and the label recognition rate are basically maintained at about 50%.

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