Pulse or digital communications – Pulse position – frequency – or spacing modulation
Reexamination Certificate
2011-05-31
2011-05-31
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Pulse position, frequency, or spacing modulation
Reexamination Certificate
active
07953146
ABSTRACT:
A method and transponder for wireless data transmission between a base station and a transponder is provided by means of inductive coupling, the transponder supports a first data transmission protocol type and/or a second data transmission protocol type. In the first data transmission protocol type, the data transmission is ended when a maximum value for the duration between successive field gaps is exceeded and in the second data transmission protocol type, after the initiation of the data transmission a reference duration is transmitted by the base station, by means of which the calibration value is determined in the transponder, whereby the calibration value is used for calibrating subsequently received durations. The reference duration is selected as greater than the maximum duration value.
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Klaus Finkenzeller, “RFID Handbook,” Fundamentals and Applications in Contactless Smart Cards and Identification, Second Edition, Chapter 3.2.1.2 (Load Modulation), pp. 42-47.
Kurz Alexander
Neal Mathew
Atmel Corporation
Baker & Botts L.L.P.
Liu Shuwang
Tayong Helene
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