RFID READER SYSTEM AIDED BY RF POWER OF MEASUREMENT
First Claim
Patent Images
1. A method for a Radio Frequency Identification (RFID) reader system to communicate with a plurality of RFID tags, comprising:
- causing a first signal to be transmitted from the RFID reader system, the first signal causing the RFID tags to be silent during a first tag silent period;
measuring an aspect of an initial reference signal received during the first tag silent period;
receiving a second signal;
comparing a power of the second signal with the detection threshold; and
performing a demodulation action on the second signal depending on the comparison.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and circuits for using measurement based threshold(s) to detect Radio Frequency IDentification (RID) tag responses in readers are described. Tag response itself is detected based on a measurement that is compared to a measurement during a tag silent period. Beginning and/or end of tag response are also detected using multiple measurements during tag response. The initial detection threshold may be replaced with a lower second threshold once demodulation of the tag response begins.
-
Citations
66 Claims
-
1. A method for a Radio Frequency Identification (RFID) reader system to communicate with a plurality of RFID tags, comprising:
-
causing a first signal to be transmitted from the RFID reader system, the first signal causing the RFID tags to be silent during a first tag silent period;
measuring an aspect of an initial reference signal received during the first tag silent period;
receiving a second signal;
comparing a power of the second signal with the detection threshold; and
performing a demodulation action on the second signal depending on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. An article comprising a machine-readable memory containing thereon instructions which, if executed by a component of a Radio Frequency Identification (RFID) reader system, cause the component to perform operations comprising:
-
causing a first signal to be transmitted from the RFID reader system, the first signal causing the RFID tags to be silent during a first tag silent period;
measuring an aspect of an initial reference signal received during the first tag silent period;
setting a detection threshold from the measured aspect of the initial reference signal;
receiving a second signal;
comparing a power of the second signal with the detection threshold; and
performing a demodulation action on the second signal depending on the comparison. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
-
-
45. An operational processing block for a Radio Frequency Identification (RFID) reader system to communicate with one or more RFID tags, the block operable to:
-
cause a first signal to be transmitted from the RFID reader system, the first signal causing the RFID tags to be silent during a first tag silent period;
measure an aspect of an initial reference signal received during the first tag silent period;
set a detection threshold from the measured aspect of the initial reference signal;
receive a second signal;
compare a power of the second signal with the detection threshold; and
perform a demodulation action on the second signal depending on the comparison. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
-
Specification