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

A frame time slot and ultra-high frequency technology, applied in the field of multi-tag reading, can solve problems affecting the recognition efficiency of algorithms, and achieve strong application value and excellent performance

Inactive Publication Date: 2014-07-30
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 res...

Method used

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

Examples

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Embodiment Construction

[0080] The invention will be further illustrated by the following examples.

[0081] (1) The reader sends a Query command to the tag

[0082] The RFID tag anti-collision system of the BSFA algorithm consists of a reader and multiple tags. First, the reader sends the command Query to the tags entering the identification range, starts the inventory cycle, and the tags enter the ready state.

[0083] (2) The tag responds to the Query command of the reader

[0084] During the tag recognition process, each tag executes a 16-bit time slot counter. After receiving the Query command, all tags that enter the ready state start from 0 to round(n(A+α) / (βA 2 Randomly select a time slot from +γA)) time slots and store it in their respective time slot counters, the tag enters the response state, and the tag with a time slot counter of 0 responds. Then, the response tag generates a 16-bit random sequence RN16 through a random or pseudo-random data generator (RNG), and sends the respective R...

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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...

Claims

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Application Information

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IPC IPC(8): G06K7/00
Inventor 张小红穆宇超钟小勇
Owner JIANGXI UNIV OF SCI & TECH
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