Controlling rfid tag population backscatter characteristics
AssigneeImpinj, Inc.
InventorsJoshua F. ENSWORTH, Alberto PESAVENTO, Harley K. Heinrich, Theron STANFORD, Thomas G. ANDERL
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Abstract
RFID tag ICs in a population can adjust the impedance values used to backscatter-modulate reply signals to increase the distribution or spread of backscattered signal parameters, thereby facilitating the recovery of collided tag replies. An RFID tag IC may adjust its impedance value(s) based on a reader command or independently.
Claims20
A Radio Frequency Identification (RFID) tag integrated circuit (IC) comprising:
- a transceiver circuit configured to communicate with an RFID reader;
- a pseudorandom number generator, and
- a processing block configured to:
- receive, via the transceiver circuit, a command instructing the tag IC to adjust a delta-gamma parameter during backscatter to improve a reply collision recovery rate at the reader;
- and
- in response to receiving the command, adjust the delta-gamma parameter using one or more bits of a pseudorandom number generated by the pseudorandom number generator.
A Radio Frequency Identification (RFID) tag integrated circuit (IC) comprising:
- a transceiver circuit configured to communicate with an RFID reader;
- a pseudorandom number generator;
- and
- a processing block configured:
- receive, via the transceiver circuit, a command instructing the tag IC to adjust a phase parameter used during backscatter to improve a reply collision recovery rate at the reader;
- and
- in response to receiving the command, adjust the phase parameter using one or more bits of a pseudorandom number generated by the pseudorandom number generator.
A Radio Frequency Identification (RFID) tag integrated circuit (IC) comprising:
- a transceiver circuit configured to communicate with an RFID reader;
- and
- a processing block configured to:
- determine that at least one backscatter parameter is to be adjusted to improve a reply collision recovery rate at the reader;
- determine an extent to which the backscatter parameter should be adjusted;
- and
- adjust the backscatter parameter to the determined extent.
Dependencies are inferred from the claim text.