Preambles with relatively unambiguous autocorrelation peak in RFID systems
First Claim
Patent Images
1. An RFID tag comprising:
- two antenna segments; and
a modulator capable of coupling and uncoupling the antenna segments together in response to a controlling signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first.
1 Assignment
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Abstract
RFID tags transmit data preceded by easily detectible preambles, and RFID readers detect such preambles. The preambles of the invention are easily detectible by being specially constructed to have a corresponding autocorrelation diagram with a relatively unambiguous autocorrelation peak. In addition, the preambles may concurrently encode FM0 symbols, while even maintaining a zero mean balance.
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Citations
37 Claims
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1. An RFID tag comprising:
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two antenna segments; and
a modulator capable of coupling and uncoupling the antenna segments together in response to a controlling signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first. - View Dependent Claims (2, 3, 4, 5)
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6. An RFID tag comprising:
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two antenna segments; and
a modulator capable of coupling and uncoupling the antenna segments together in response to a controlling signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments. - View Dependent Claims (7)
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8. A device comprising:
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means for receiving a query signal encoded in a wave;
means for transmitting a preamble signal encoded in a wave in response to the received query signal, the preamble signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first; and
means for transmitting a data signal encoded in a wave after transmitting the preamble signal. - View Dependent Claims (9, 10)
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11. A device comprising:
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means for receiving a query signal encoded in a wave;
means for transmitting a preamble signal encoded in a wave in response to the received query signal, the preamble signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments; and
means for transmitting a data signal encoded in a wave after transmitting the preamble signal. - View Dependent Claims (12)
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13. 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;
generating for transmission a preamble signal encoded in a wave in response to a received query signal, the preamble signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first; and
generating for transmission a data signal encoded in a wave after transmitting the preamble signal. - View Dependent Claims (14, 15)
- 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;
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16. 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;
generating for transmission a preamble signal encoded in a wave in response to a received query signal, the preamble signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments; and
generating for transmission a data signal encoded in a wave after transmitting the preamble signal. - View Dependent Claims (17)
- 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;
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18. A method for an RFID tag comprising:
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receiving a query signal encoded in a wave;
transmitting a preamble signal encoded in a wave in response to the received query signal, the preamble signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first; and
transmitting a data signal encoded in a wave after transmitting the preamble signal. - View Dependent Claims (19, 20)
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21. A method for an RFID tag comprising:
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receiving a query signal encoded in a wave;
transmitting a preamble signal encoded in a wave in response to the received query signal, the preamble signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments; and
transmitting a data signal encoded in a wave after transmitting the preamble signal. - View Dependent Claims (22)
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23. A device comprising:
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means for receiving a wave;
means for decoding a tag signal from the wave;
means for determining whether the tag signal encodes a preamble signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first; and
if so, means for decoding data from a portion of the tag signal that follows the preamble signal. - View Dependent Claims (24, 25)
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26. A device comprising:
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means for receiving a tag signal encoded in a wave;
means for determining whether the tag signal encodes a preamble signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments; and
if so, means for decoding data from a portion of the tag signal that follows the preamble signal. - View Dependent Claims (27)
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28. 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;
determining whether a tag signal decoded from a received wave encodes a preamble signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first; and
if so, commencing decoding data from a portion of the tag signal that follows the preamble signal. - View Dependent Claims (29, 30)
- 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;
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31. 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;
determining whether a received tag signal encodes a preamble signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments; and
if so, decoding data from a portion of the tag signal that follows the preamble signal. - View Dependent Claims (32)
- 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;
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33. A method for an RFID reader comprising:
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receiving a wave;
decoding a tag signal from the wave;
determining whether the tag signal encodes a preamble signal having a waveform that includes a plurality of first segments and second segments different from the first segments, all in a succession of first, first, second, first, second, second, first, second, second, second, first, and then first; and
if so, decoding data from a portion of the tag signal that follows the preamble signal. - View Dependent Claims (34, 35)
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36. A method for an RFID reader comprising:
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receiving a tag signal encoded in a wave;
determining whether the tag signal encodes a preamble signal having a waveform that includes a plurality of first segments and second segments in a succession that encodes valid FM0 symbols and has a P2SLR of at least 5 dB, the waveform including an equal number of first segments and second segments; and
if so, decoding data from a portion of the tag signal that follows the preamble signal. - View Dependent Claims (37)
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Specification
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Current AssigneeImpinj, Inc.
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Original AssigneeImpinj, Inc.
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InventorsSundstrom, Kurt Eugene
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Application NumberUS10/967,996Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current340/10.200CPC Class CodesG01S 13/756 using a signal generator fo...
