RFID READER SYSTEMS WITH DIGITAL RATE CONVERSION
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
Jan 11, 2007
filing date -
May 19, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Fractional delay based digital rate conversion is employed for timing recovery from RFID tag responses at an RFID reader. Signal received from the tag is asynchronously sampled and interpolated. A desired time variant fractional delay coefficient is computed based on the interpolation and time offset is adjusted such that an output sample matches a target point. A data matched filter is optionally integrated with the fractional delay based digital rate converter, which includes a digital phase lock loop.
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