Method and device for eliminating dynamic self-interference in RFID reader

A self-interference, reader-writer technology, used in instruments, electromagnetic radiation induction, induction record carriers, etc., can solve the problems of poor system stability and low receiving sensitivity, and achieve the effect of high receiving sensitivity and good system stability.

Active Publication Date: 2017-10-03
INVENGO INFORMATION TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of high receiving sensitivity and good system stability to eliminate the defects in th

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  • Method and device for eliminating dynamic self-interference in RFID reader
  • Method and device for eliminating dynamic self-interference in RFID reader
  • Method and device for eliminating dynamic self-interference in RFID reader

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Embodiment Construction

[0029] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, in a method embodiment of eliminating dynamic self-interference in the RFID reader-writer of the present invention, the method comprises the following steps:

[0031]Step S11 obtains the reference self-interference signal, and obtains its maximum attenuation value: in this step, obtains the reference self-interference radio frequency signal, and obtains the maximum attenuation value of the reference self-interference radio frequency signal after processing it; in this embodiment , the above-mentioned reference self-interference signal is obtained on the isolated end of the transceiver coupling unit, the reference self-interference signal obtained on this port is divided into two paths, one path is used for radio frequency power detection, and the power level representing its power is obtained, Perform analog-to-digital ...

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Abstract

The invention relates to a method for eliminating dynamic self-interference in an RFID reader. The method comprises the steps of: acquiring a reference self-interference radio frequency signal, and processing the reference self-interference radio frequency signal to obtain a maximum attenuation value for the reference self-interference radio frequency signal; decomposing the reference self-interference radio frequency signal into I-path and Q-path radio frequency signals, and generating a plurality of groups of adjustment control signals; using each group of the adjustment control signals to adjust the reference self-interference radio frequency signal one by one, so as to obtain a plurality of first received signals and obtain intensity numerical values representing intensities of the first received signals; and comparing the intensity numerical values of the plurality of first received signals, and selecting the control signal with the minimum intensity numerical value as a cancellation device of a current self-interference signal. The invention further relates to a device for implementing the method. The method and the device for eliminating dynamic self-interference in the RFID reader have the beneficial effects of high receiving sensitivity and good system stability.

Description

technical field [0001] The invention relates to RFID radio frequency identification equipment, more specifically, to a method and device for eliminating dynamic self-interference in an RFID reader-writer. Background technique [0002] Passive RFID systems are currently the mainstream of RFID technology applications. Compared with active RFID systems, passive RFID systems can achieve a smaller range of identification tags. When dealing with a dense number of passive tags, their identification accuracy is also very large. limitations. The main reasons for the limitations of the passive RFID system reader in the use environment and antenna adaptability are as follows: the passive electronic tag itself does not provide energy, the energy for the tag to work comes from the electromagnetic wave emitted by the reader, and the reflected signal of the tag is only 20% of the received electromagnetic wave energy is very weak. For the reader-writer, the reader-writer used in the passi...

Claims

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Application Information

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IPC IPC(8): G06K7/10
CPCG06K7/10019
Inventor 王朝晖黄华辉段璞曾三妹周海斌
Owner INVENGO INFORMATION TECH
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