Systems and methods for collision avoidance in near-field communications
First Claim
1. A method of detecting an inductive communication transmission, comprising:
- receiving an inductive communication signal having a center frequency;
sampling the signal at a rate higher than twice the center frequency;
digitally downconverting the sampled signal;
comparing an energy of the downconverted signal to a detection threshold; and
selectively transmitting a communication based on the comparison, wherein selectively transmitting comprises transmitting the communication when the energy of the downconverted signal is below the detection threshold.
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Accused Products
Abstract
Systems, methods, and devices for wireless communication are included herein. An aspect of the subject matter described in the disclosure provides a device configured to detect a transmission. The device includes a receiver configured to receive an inductive communication signal having a center frequency. The device further includes an analog-to-digital converter configured to sample the signal at a rate higher than twice the center frequency. The device further includes one or more processors configured to digitally downconvert the signal. The processors are further configured to compare an energy of the downconverted signal to a detection threshold. The device further includes a transmitter configured to selectively transmit a communication based on the comparison.
8 Citations
36 Claims
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1. A method of detecting an inductive communication transmission, comprising:
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receiving an inductive communication signal having a center frequency; sampling the signal at a rate higher than twice the center frequency; digitally downconverting the sampled signal; comparing an energy of the downconverted signal to a detection threshold; and selectively transmitting a communication based on the comparison, wherein selectively transmitting comprises transmitting the communication when the energy of the downconverted signal is below the detection threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of collision avoidance in a near-field communications (NFC) device, the method comprising:
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receiving a NFC signal having a carrier frequency; sampling the signal at four times the carrier frequency; digitally downconverting the sampled signal; comparing an energy of the downconverted signal to a detection threshold; and selectively transmitting a communication based on the comparison, wherein selectively transmitting comprises transmitting the communication when the energy of the downconverted signal is below the detection threshold.
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10. A device configured to detect an inductive communication transmission comprising:
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a receiver configured to receive an inductive communication signal having a center frequency; an analog-to-digital converter configured to sample the signal at a rate higher than twice the center frequency; one or more processors configured to; digitally downconvert the sampled signal; and compare an energy of the downconverted signal to a detection threshold; and a transmitter configured to selectively transmit a communication based on the comparison, wherein the transmitter is further configured to transmit the communication when the energy of the downconverted signal is below the detection threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A near-field communication (NFC) device configured to avoidance collision, the device comprising:
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a receiver configured to receive a NFC signal having a carrier frequency; an analog-to-digital converter configured to sample the signal at four times the carrier frequency; one or more processors configured to; digitally downconvert the sampled signal; and compare an energy of the downconverted signal to a detection threshold; and a transmitter configured to selectively transmit a communication based on the comparison, wherein the transmitter is further configured to transmit the communication when the energy of the downconverted signal is below the detection threshold.
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19. An apparatus for detecting an inductive communication transmission comprising:
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means for receiving an inductive communication signal having a center frequency; means for sampling the signal at a rate higher than twice the center frequency; means for digitally downconverting the signal; means for comparing an energy of the downconverted signal to a detection threshold; and means for selectively transmitting a communication based on the comparison comprising means for transmitting the communication when the energy of the downconverted signal is below the detection threshold. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. An apparatus for collision avoidance in a near-field communications (NFC) device, the apparatus comprising:
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means for receiving a NFC signal having a carrier frequency; means for sampling the signal at four times the carrier frequency; means for digitally downconverting the sampled signal; means for comparing an energy of the downconverted signal to a detection threshold; and means for selectively transmitting a communication based on the comparison comprising means for transmitting the communication when the energy of the downconverted signal is below the detection threshold.
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28. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:
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receive an inductive communication signal having a center frequency; sample the signal at a rate higher than twice the center frequency; digitally downconvert the sampled signal; compare an energy of the downconverted signal to a detection threshold; and selectively transmit a communication based on the comparison, wherein selectively transmitting comprises transmitting the communication when the energy of the downconverted signal is below the detection threshold. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A non-transitory computer-readable medium comprising code that, when executed, causes a near-field communication (NFC) apparatus to:
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receive a NFC signal having a carrier frequency; sample the signal at four times the carrier frequency; digitally downconvert the sampled signal; compare an energy of the downconverted signal to a detection threshold; and selectively transmit a communication based on the comparison, wherein selectively transmitting comprises transmitting the communication when the energy of the downconverted signal is below the detection threshold.
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Specification