Self-interference signal eliminating apparatus and method and RFID reader-writer

Abstract

The invention discloses an eliminator of a self-interference signal, which comprises a dephasing attenuation processing module and a signal elimination processing module, wherein the dephasing attenuation processing module receives a first signal from the outside to carry out attenuation and dephasing processing so acquire an estimated self-interference signal, and the signal elimination processing module receives a second signal from the outside and the estimated self-interference signal from the dephasing attenuation processing module and eliminates the estimated self-interfering signal in the second signal. The invention also discloses an elimination method of the self-interference signal, which comprises the following steps: first, the attenuation and dephasing processing is carried out to a sent signal to obtain the estimated self-interference signal; and second, the estimated self-interference signal is eliminated in the received signal. In addition, the invention also discloses an RFID read-write counter. The eliminator of the self-interference signal acquires the estimated self-interference signal and eliminates the estimated self-interference signal by the attenuation and dephasing processing of the sent signal so as to reduce the influence of the self-interference signal on receiving sensitivity.

Description

technical field [0001] The invention relates to radio frequency identification (RFID) technology, in particular to a self-interference signal elimination device, a self-interference signal elimination method and an RFID reader. Background technique [0002] RFID technology is an automatic identification technology that is widely used in animal tracking, tracking of ocean container tracking, etc. In addition, it is also used in daily applications such as supply chain management, toll gates, and vehicle authentication at gas stations. [0003] At present, the requirements for RFID systems are getting higher and higher, especially for long-distance and large-scale reading signals. At present, a technology that realizes the above-mentioned long-distance and large-scale reading signals is UHF radio frequency identification technology. (UHF RFID). In UHF RFID technology, the system read reliability depends on the reliability of the forward link from the receiving device to the ta...

AI Technical Summary

Problems solved by technology

[0020] In the above-mentioned prior art, since the power of the self-interference signal is much higher than the power of the signal returned by the tag, after being filtered by the DC filter 30, a relatively high-power self-interference signal still remains, so the receiving sensitivity of the RFID reader remains low. Very low, no effective improvement

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