Method, system, and apparatus for remote data calibration of a RFID tag population
First Claim
1. A method for defining data symbols in a radio frequency identification (RFID) tag device, comprising the steps of:
- (a) receiving a first calibration pulse on an input signal;
(b) storing a length of the received first calibration pulse as a stored first length;
(c) receiving a second calibration pulse on the input signal; and
(d) storing a length of the received second calibration pulse as a stored second length.
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Accused Products
Abstract
A method, system, and apparatus for remotely calibrating data symbols received by a radio frequency identification (RFID) tag population are described. Tags are interrogated by a reader, which may be located in a network of readers. The reader transmits data symbols to the tags. Tags respond to the interrogations with symbols that each represent one or more bits of data. To calibrate the tags, the reader transmits a plurality of pulses of different lengths to the tag population. The tags receive the plurality of pulses. A characteristic of each pulse, such as a pulse length, is stored by the tags. The stored pulse lengths are used to define different data symbols that are subsequently received by the tags from the reader.
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Citations
23 Claims
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1. A method for defining data symbols in a radio frequency identification (RFID) tag device, comprising the steps of:
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(a) receiving a first calibration pulse on an input signal;
(b) storing a length of the received first calibration pulse as a stored first length;
(c) receiving a second calibration pulse on the input signal; and
(d) storing a length of the received second calibration pulse as a stored second length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for defining data signal symbols in a radio frequency identification (RFID) tag device, comprising the steps of:
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(a) receiving a first calibration signal;
(b) detecting a physical characteristic of the received first calibration signal;
(c) storing the detected physical characteristic of the received first calibration signal as a stored first characteristic;
(d) receiving a second calibration pulse; and
(d) detecting a physical characteristic of the received second calibration signal; and
(e) storing the detected physical characteristic of the received second calibration signal as a stored second characteristic. - View Dependent Claims (23)
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Specification