Data communication method from label to reader-writer based on Miller codes

Abstract

The invention provides a reverse link data communication method from a label to a reader-writer based on Miller codes, which comprises steps as follows: a label is activated after entering the identification range of a reader-writer, and waits for an instruction of the reader-writer; the reader-writer transmits an inquiry instruction to the label; after receiving the instruction, the label generates a random number; whether the random number is judged, if so, the label transmits a frame synchronization sequence and an identification code to the reader-writer, or else, the label waits for the next inquiry instruction transmitted by the reader-writer; and the reader-writer receives a data signal, which is transmitted by the label and comprises the frame synchronization sequence and the identification code, and judges for the synchronization, if so, the reader-writer transmits a baseband instruction to the label, or else, the reader-writer transmits the next inquiry instruction.

Description

technical field [0001] The present invention relates to the technical field of radio frequency identification, and more specifically, relates to a data communication method for a reverse link from a tag to a reader-writer based on Miller coding, which is applied to a radio frequency identification system. Background technique [0002] Radio Frequency Identification (RFID) technology is an automatic identification technology for long-distance communication through radio frequency to achieve the purpose of identifying items. [0003] 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 through electromagnetic waves. In ...

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Problems solved by technology

However, the communication of the frame synchronization sequence will cause high false synchronization. The reasons are: 1. The frame synchronization sequence only contains 6-bit frame synchronization code, and its anti-interference ability is weak, because the energy of the passive tag backscatter signal is relatively low. Weak, it is susceptible to interference; 2. The frame synchronization sequence only contains code sequences that conform to the coding rules, without considering violations. If the same data as the synchronization sequence appears in the data information, it will appear even if there is no interference. false synchronization

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