utilizing physical layer information to improve rfid tag
utilizing physical layer information to improve rfid tag
utilizing physical layer information to improve rfid tag
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difficult problem as field nulls are created due <strong>to</strong> multipath and other environmental<br />
effects. Thus even <strong>tag</strong>s within read range may vanish and reapper unxpectedly.<br />
Framed ALOHA usually means that acknowledgements are sent only after the<br />
end of a frame and not in between but this is not true for RFID anti-collision pro<strong>to</strong>cols<br />
[7]. RFID pro<strong>to</strong>cols send a QueryRep command <strong>to</strong> signal the beginning of the next<br />
slot. By replacing this command with a Query command, a new round can be started<br />
instead. In [7], the estimate of the number of <strong>tag</strong>s in the field is updated at the end<br />
of each slot as opposed <strong>to</strong> the end of a frame in previous approaches. The probability<br />
estimate of the number of <strong>tag</strong>s replying is updated using a Bayesian approach.<br />
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