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

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...

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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 the RFID reader-writer for the above-mentioned defects of low receiving sensitivity and poor system stability in the prior art. Method and device for dynamic self-interference

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