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Data transmission method from tag to reader based on Miller coding

A data transmission method and Miller coding technology, applied in the field of reverse link data transmission, can solve the problems of anti-interference, weak interference ability, high false synchronization and so on.

Inactive Publication Date: 2014-01-08
CHINA ELECTRONICS STANDARDIZATION INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carrying out communication can cause higher false synchronization, and its reason is: 1, this frame synchronization sequence only comprises 6 frame synchronization codes, and its anti-interference
The interference ability is weak, because the energy of the backscatter signal of the passive tag is weak, it is easily affected by interference; 2. The frame synchronization sequence is only

Method used

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  • Data transmission method from tag to reader based on Miller coding
  • Data transmission method from tag to reader based on Miller coding
  • Data transmission method from tag to reader based on Miller coding

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Embodiment Construction

[0040] FIG. 3a is a pulse waveform diagram schematically illustrating the principle of Miller encoding. As shown in the figure, the Miller coding principle is:

[0047]

[0048] Wherein, N is the encoded frame synchronization sequence length, which is 16 in the present invention. The autocorrelation performance is defined as the maximum

[0049] FIG. 6 is a graph showing the probability of correct synchronization using the data transmission method of the present invention, and FIG. 7 is a graph showing

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Abstract

The present invention provides a reverse link data transmission method based on Miller coding from the tag to the reader, which includes: the tag enters the recognition range of the reader to be activated and waits for the command of the reader, reads and writes The tag sends a query command to the tag, the tag generates a random number after receiving the command, and judges whether the random number is 0, if it is 0, the tag sends a frame synchronization sequence and an identification code to the reader; otherwise, the tag waits for the reader The next round of query commands issued; the reader receives the data signal containing the frame synchronization sequence and the identification code sent by the tag and judges whether it is synchronized. If it is, it sends a baseband command to the tag, otherwise it sends out the next round of query commands.

Description

Data transmission method from tags to readers based on Miller coding Technical field [0001] The present invention relates to the technical field of radio frequency identification, more specifically, relates to a radio frequency identification system based on Miller-encoded tag-to-reader reverse link data transfer method. Background technique Radio frequency identification (RFID) technology is to carry out long-distance communication by radio frequency mode to realize the self-identification object purpose Motion recognition technology. This radio frequency identification technology is compatible with today's digital mobile commerce, can realize automatic identification and remote real-time monitoring Control and management, which is one of the popular technologies in contemporary information technology. Install RFID tags on items that require authentication, The tag sends the identity information about the item to the receiving device through electromagnetic waves. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 耿力张有光沈一澜高林冯敬王文峰宋继伟刘文莉曹国顺金倩
Owner CHINA ELECTRONICS STANDARDIZATION INST
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