Decoding with memory in RFID system
First Claim
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1. 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.
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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.
103 Citations
22 Claims
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1. An RFID tag comprising:
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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)
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12. An article comprising:
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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 (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification