Method for raising communication reliability of radio frequency identification system |
Title： |
| Method for raising communication reliability of radio frequency identification system |
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Application Number： |
200710064365 |
Application Date： |
2007/03/13 |
Announcement Date： |
2007/08/22 |
Pub. Date： |
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Publication Number： |
101021895 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G06K 7/00 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Li Min, Zhang Chun, Li Yongming, Wang Zhihua |
Key Words： |
communication, reliability, radio frequency, identification system |
Abstract： |
This invention relates to a method for increasing communication reliability of RF identifying system including: 1, adding a direct sequence spread spectrum circuit in labels in the reverse link between the communications of a label and a card reader and adding a spread spectrum code and a de-spread circuit same to the direct sequence spread spectrum circuit in the card reader, 2, the baseband data to be sent by the label is engaged in direct sequence spread spectrum by the preset spread code and the spread circuit, 3, modulating the baseband data after being spread onto a carrier, 4, the label feedback signal is reflected to the reader via the antenna, 5, said reader demodulates the carrier reflected by the label, 6, said reader de-spreads the baseband signal by the spreading code in conformity with the label to get the baseband data sent by the label. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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