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RFID read-writing device with collision checking function and its collision checking method

A technology of collision detection and reader-writer, which is applied in the field of radio frequency identification, can solve problems such as the implementation of anti-collision algorithms without consideration, and achieve the effect of improving recognition efficiency

Inactive Publication Date: 2008-02-13
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the researches on anti-collision algorithms start from the point of view of mathematics, without considering the realization of anti-collision algorithms in practical applications.

Method used

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  • RFID read-writing device with collision checking function and its collision checking method
  • RFID read-writing device with collision checking function and its collision checking method
  • RFID read-writing device with collision checking function and its collision checking method

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Embodiment Construction

[0025] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] The hardware block diagram of the RFID reader with collision detection function is shown in Figure 1. The reader includes a sending loop, a receiving loop, an interface component and a DSP processing module, and the receiving loop includes a filtering module, a correlation module, an FM0 decoding module and a noise filter module, timer and collision detection module. Wherein, the input signal of the collision detection module includes, the correlation calculation value cor signal output from the noise filter module, the collision threshold signal cor_th1 output from the correlation module, the demodulated data signal data_decode and the demodulated data waveform signal output from the FM0 decoding module data-symbol, the timing indication signal output by the timer, and the collision detection module outputs a collision or non-collision indicati...

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Abstract

The invention discloses an RFID interrogator with collide detection and a collide detection algorithm. When the interrogator receives the information returned from an electronic label, the interrogator firstly detects if the frame head data of the returned data are corrupted. If the data are corrupted, collision is considered to have occurred, and if not, data segments of the returned information are further detected for violation of the FMO coding rules. If one violation of the FMO coding rules is detected, collision is considered to have occurred, and if not, a further detection is carried out. The DSP sends an ACK command, and if the interrogator does not receive any information about the electronic lable within a time period T1max stipulated in the protocol, collision may be considered to have occurred, and if the interrogator receives return information from the electronic label, collision is considered to have not occurred, and the detection period is ended. The invention is used for detecting possible collision in three levels, and can thus increase accuracy of collision detection, provide supports to DSP module for realizing various anti-collision algorithms, and effectively increase efficiency of an interrogator of recognizing electronic labels.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to a radio frequency identification (RFID) reader, in particular to an RFID reader with a collision detection function and a collision detection method thereof. Background technique [0002] With the increasing maturity of RFID technology, electronic tags will be widely used in the fields of supply chain management, asset management, production management and security anti-counterfeiting. Although RFID technology has brought great convenience to many fields, there are still some problems in the application of RFID technology. One of the main problems is that in many applications, the reader is required to identify multiple targets at high speed. How to improve the anti-collision performance of the reader and improve the recognition efficiency of the reader has become one of the key technologies for the large-scale promotion and application of RFID ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K17/00G06K7/08
Inventor 王俊宇刘丹谈熙赵爽陆佳晶周晓方闵昊
Owner FUDAN UNIV
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