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

A Miller coding and data communication technology, applied in the field of radio frequency identification, can solve the problems of being susceptible to interference, high false synchronization, weak anti-interference ability, etc., and achieve the effect of reducing the probability of false synchronization

Inactive Publication Date: 2014-04-09
BEIHANG UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment Construction

[0036] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] figure 1 It is a schematic diagram of a communication system from a tag to a reader using the communication method of the present invention. The reader transmits an ACK modulation signal, and when one or more tags enter the working range of the reader, the reader can receive The transmitted signal can return the required data information according to the received command; the reader / writer transmits the data information to the computer data management system after receiving it.

[0038] figure 2 It is a structural block diagram of a reader and a tag using the data communication method of the present invention. As shown in the figure, the reader includes a radio frequency front end with receiving and transmitting functions, a modulation and demodulation circuit for modulation and demodulation, and a modulation and demodulation circuit ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K17/00
Inventor 沈一澜张有光宋继伟耿力王立张光山沈红伟
Owner BEIHANG UNIV
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