Method and apparatus to estimate the number of transponders in a field
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United States of America Patent
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Oct 22, 2013
Grant Date -
Jun 7, 2012
app pub date -
Dec 2, 2010
filing date -
Dec 2, 2010
priority date (Note) -
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Abstract
A total number of transponders in an interrogation field is estimated or determined based on demodulated baseband direct and quadrature components from a plurality of collided responses from multiple transponders, including collided responses from which information encoded therein cannot be recovered, and would conventionally be discarded. A query or Q value may be set without an a priori knowledge of the actual number or even approximate number of transponders in the field of the interrogator or reader. Such may allow transponders to be quickly and efficiently singulated, for example in a single pass, and information read from and/or written to singulated transponders.
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