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Decoding method for FM0 (bi-phase space coding) of ultrahigh-frequency RFID (radio frequency identification) reader and writer

A decoding method and reader-writer technology, applied in the decoding field of UHF RFID reader-writer FM0 code, can solve the problems such as frequency offset, duty cycle offset, and FM0 signal interference returned by tags, and achieve improved The effect of reading and writing efficiency, small signal output delay, and fast response speed

Inactive Publication Date: 2015-02-18
FOYOUNG MICROELECTRONICS
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Problems solved by technology

[0006] The purpose of the present invention is to solve the frequency offset of the tag returning FMO signal generated by the decoding method of the FMO encoding of the traditional RFID reader, and the duty cycle offset caused by the signal processing at the receiving end of the reader and the power supply or other factors. To solve the technical problem of FM0 signal interference, design a decoding method that extracts the time information carried by the FM0 code itself through a sliding window, and uses a UHF RFID reader FM0 code that is close to manual discrimination

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  • Decoding method for FM0 (bi-phase space coding) of ultrahigh-frequency RFID (radio frequency identification) reader and writer
  • Decoding method for FM0 (bi-phase space coding) of ultrahigh-frequency RFID (radio frequency identification) reader and writer
  • Decoding method for FM0 (bi-phase space coding) of ultrahigh-frequency RFID (radio frequency identification) reader and writer

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[0018] The present invention will be further described below in conjunction with accompanying drawing, and the structure and principle of this device are very clear to those skilled in the art. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The present invention is a kind of UHF RFID reader-writer FMO decoding method based on EPC protocol, the block diagram of this decoding method is as follows figure 1 As shown, the signal encoded by FM0 requires that the level at the beginning of each symbol be different from the level at the end of the previous symbol, that is to say, the beginning of each symbol will be flipped once, if this If the code element is "1", then it will not be flipped during the entire code element period; if the code element is "0", then it will be flipped again within the cycle of this code element. The characteristics of this encoding make the c...

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Abstract

The invention relates to the technical field of wireless signal processing, in particular to a decoding method for FM0 (bi-phase space coding) of an ultrahigh-frequency RFID (radio frequency identification) reader and writer. A frequency extraction module and a template comparison module are used in the decoding method. The decoding method is characterized by including: taking a frequency set value as an initial value, using a slide window for weighted moving average of FM0 coding periods so as to obtain a frequency signal approximate to actual frequency, completing frequency extraction, obtaining next template with a code element being ideal 1 or 0 according to the frequency, comparing the actual signal with the template and taking a more approximate one as a decoding result. The decoding method has the advantages that the frequency set value is taken as the initial value, one slide window is used for weighted moving average of the FM0 coding periods, and FM0 signals are decoded correctly, so that the error code rate of the reader and writer is decreased greatly, reading and writing efficiency of the reader and writer is improved, and the decoding method is high in response speed, small in computing amount and signal output delay, high in practicality and the like.

Description

[technical field] [0001] The invention relates to the technical field of wireless signal processing, in particular to a decoding method for FMO encoding of an ultra-high frequency RFID reader-writer. [Background technique] [0002] RFID (radio frequency identification) technology refers to an automatic identification technology that uses induction, radio waves or microwaves for non-contact two-way communication for the purpose of identification and data exchange. This technology can be used to track and manage all physical objects. In 2006, EPC global (Global Product Electronic Code Management Center) was incorporated into the ISO / IEC 18000-6C standard. In November 2013, the new standard EPC Gen2V2.0 was approved, which is used for UHF RFID technical specifications around 900MHz. Class 1 and 2nd generation UHF RFID 860MHz-960MHz communication protocol, UHF frequency band RFID system has the characteristics of fast read and write speed, large storage capacity, long recognitio...

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Application Information

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IPC IPC(8): G06K19/077
Inventor 徐琦陈佳建
Owner FOYOUNG MICROELECTRONICS
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