Label signal decoding method, label decoding device and label reader

Abstract

The invention relates to the technical field of RFID radio frequency, and mainly relates to a label signal decoding method, a label decoding device and a label reader. The label signal decoding methodcomprises a data sampling step, a frame header detection steps and a data decoding step. In the frame head detection step, a matching degree of a frame head template sequence and a label data signalsequence is measured by using related coefficients, and a frame header is accurately found in a waveform comparison mode; in the data decoding step, data sequences within a bit period are extracted according to a sampling multiplier N and a level skip condition of a data part, and the problem of decoding failure caused by frequency offset of a certain degree can be processed; and the computation amount of determining the data bit according to an accumulated value is small, the judgment result is reliable, and certain fault tolerance is available.

Description

technical field

[0001] The invention relates to the field of RFID radio frequency technology, and mainly relates to a tag signal decoding method, a tag decoding device and a tag reader. 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. The quality of RFID tag signal decoding directly affects the sensitivity and throughput of the reader, and becomes an important indicator for evaluating the performance of the reader.

[0003] According to the GB29768 standard, the tag signal returned by the RFID tag to the RFID reader is in the FM0 encoding format. The tag signal includes a frame header part and a data part.

[0004] The characteristic of FM0 encoding is: the change of the level is used to rep...

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