Method for communication with multiple transponders
First Claim
1. A method for communication with multiple transponders, particularly for reading digital information from transponders, wherein information being different in every transponder, as may be a chip serial number (S/N), is transmitted by the transponders using the same response channel for all transponders in such a way that possible states of a digital information per digit are transmitted during different windows in time for every digit position using a type of modulation (e.g. ASK, FSK, PSK), each window being associated to a possible state of a digit position, thus allowing the interrogator to assess the existence of the respective information in the transponder population per digit position.
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Abstract
A method for communication with multiple transponders, particularly for reading digital information from transponders. The information being different in every transponder, as may be a chip serial number (S/N), is transmitted by the transponders using the same response channel for all transponders in such a way that possible states of a digital information per digit are transmitted during different windows in time for every digit position using a type of modulation (e.g. ASK, FSK, PSK). Each window is associated to a possible state of a digit position. In one embodiment some of the windows are associated to a predetermined state corresponding to no modulation for reference.
17 Citations
26 Claims
- 1. A method for communication with multiple transponders, particularly for reading digital information from transponders, wherein information being different in every transponder, as may be a chip serial number (S/N), is transmitted by the transponders using the same response channel for all transponders in such a way that possible states of a digital information per digit are transmitted during different windows in time for every digit position using a type of modulation (e.g. ASK, FSK, PSK), each window being associated to a possible state of a digit position, thus allowing the interrogator to assess the existence of the respective information in the transponder population per digit position.
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14. A method for communication with multiple transponders, particularly for reading digital information from transponders, wherein information being different in every transponder, as may be a chip serial number (S/N), is transmitted by the transponders using the same response channel for all transponders in such a way that possible states of a digital information per digit are transmitted during different windows in time for every digit position using a type of modulation (e.g. ASK, FSK, PSK), the windows being associated to a possible state of a digit position or to a predetermined state corresponding to no modulation for reference, thus allowing the interrogator to assess the existence of the respective information in the transponder population per digit position.
Specification