Data transmission method from tag to reader based on fmo encoding
A data transmission method and reader technology, applied in the field of radio frequency identification, can solve the problems of short frame sequence length, unfavorable realization, weak radio frequency signal, etc., and achieve the effect of ensuring sensitivity
Inactive Publication Date: 2014-01-08
CHINA ELECTRONICS STANDARDIZATION INST +1
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AI Technical Summary
Problems solved by technology
But passive tags reflect
The RF signal to the reader is very weak, and the frame sequence length corresponding to the IS0 / IEC18000-6C protocol is relatively short, which is not conducive to the realization of correct
Method used
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[0039] FIG. 3 is a pulse waveform diagram schematically illustrating the principle of FMO encoding. As shown in the figure, according to the FMO coding rules, two
[0040] FIG. 4 is a schematic diagram showing the frame synchronization sequence of the present invention. The figure shows that the frame synchronization sequence of the present invention is composed of numbers
[0042]
[0043] Wherein, N is the encoded frame synchronization sequence length, which is 16 in the present invention. The autocorrelation property is defined as the maximum phase
[0044] 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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The present invention relates to a reverse link data transmission method from a label to a reader-writer based on FMO coding, which includes: the label enters the recognition range of the reader-writer and is activated and waits for the command of the reader-writer; The tag sends a query command, 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 to send The next round of query commands; 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 tag to reader based on FMO 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 The data transmission method of the FMO coded tag to the reverse link of the reader. 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 elect...
Claims
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Inventor 冯敬耿力高林宋继伟王文峰刘文莉金倩袁理张有光张光山
Owner CHINA ELECTRONICS STANDARDIZATION INST