Data communication method of FM0-code-based label and reader-writer

Abstract

The invention relates to a data communication method of a reverse link between an FM0-code-based label and a reader-writer. The data communication method comprises the following steps that: the label is activated after entering a recognition range of the reader-writer and awaits an order of the reader-writer; the reader-writer sends a search instruction to the label; the label receives the instruction and generates a random number, judges whether the random number is zero, and sends a frame synchronization sequence and an identity recognition code to the reader-writer if the random number is zero, and otherwise, awaits the next search instruction sent by the reader-writer; the reader-writer receives a data signal comprising the frame synchronization sequence and the identity recognition code which are sent by the label, judges whether the data signal is synchronous, if so, sends a base band order to the label, and otherwise, sends the next search instruction.

Description

Data communication method from tag to reader based on FM0 coding technical field The present invention relates to the technical field of radio frequency identification, and more specifically, relates to a data communication method of a reverse link from a tag to a reader-writer based on FMO coding applied to a radio frequency identification system. Background technique Radio Frequency Identification (RFID) technology is an automatic identification technology for long-distance communication through radio frequency to achieve the purpose of identifying items. The radio frequency identification technology is compatible with today's digital mobile commerce, and can realize automatic identification and remote real-time monitoring and management. It is one of the popular technologies in contemporary information technology. The RFID tag is installed on the item that needs to be authenticated, and the tag sends the identity information about the item to the receiving device throu...

AI Technical Summary

Problems solved by technology

However, the RF signal reflected by the passive tag to the reader is very weak, and the frame sequence length corresponding to the ISO / IEC18000-6C protocol is relatively short, which is not conducive to achieving correct synchronization

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