Decoding with memory in RFID system
First Claim
Patent Images
1. An RFID reader comprising:
- an antenna to receive a wireless signal;
a matched filter to derive a sequence of analog signal data from the wireless signal; and
a decoder that is adapted to compare at least two test series of successive samples that correspond to the analog data, and to select one of the test series for outputting.
1 Assignment
0 Petitions
Accused Products
Abstract
RFID readers, RFID tags, software, and methods decode a signal received in an RFID system. From received data, a decoder determines a number of possible test series for the output. In one embodiment, the decoder uses a memory of a previous sample to derive a subsequent sample in the test series, so as to ensure that all the test series are valid. A metric is then computed for how well each test series fits the received data. The metrics are compared to select for output the test series with the best fit. In a further embodiment, at least one of the metrics is further used to determine if a collision were present.
-
Citations
55 Claims
-
1. An RFID reader comprising:
-
an antenna to receive a wireless signal;
a matched filter to derive a sequence of analog signal data from the wireless signal; and
a decoder that is adapted to compare at least two test series of successive samples that correspond to the analog data, and to select one of the test series for outputting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An RFID tag comprising:
-
an antenna to receive a wireless signal;
a matched filter to derive a sequence of analog signal data from the wireless signal; and
a decoder that is adapted to compare at least two test series of successive samples that correspond to the analog data, and to select one of the test series for outputting. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A device comprising:
-
means for receiving a sequence of analog data;
means for deriving from the sequence at least two test series of successive samples that correspond to the analog data;
means for computing a distance metric for each of the test series with respect to the sequence;
means for selecting one of the metrics; and
means for outputting the test series corresponding to the selected metric. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
-
-
34. An article comprising:
- a storage medium, the storage medium having instructions stored thereon, in which when the instructions are executed by at least one device, they result in;
receiving a sequence of analog data;
deriving from the sequence at least two test series of successive samples that correspond to the analog data;
computing a distance metric for each of the test series with respect to the sequence;
selecting one of the metrics; and
outputting the test series corresponding to the selected metric. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
- a storage medium, the storage medium having instructions stored thereon, in which when the instructions are executed by at least one device, they result in;
-
45. A method comprising:
-
receiving a sequence of analog data;
deriving from the sequence at least two test series of successive samples that correspond to the analog data;
computing a distance metric for each of the test series with respect to the sequence;
selecting one of the metrics; and
outputting the test series corresponding to the selected metric. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
-
Specification