Active load modulation in near field communication
First Claim
Patent Images
1. A method for active load modulation, comprising:
- receiving, at a first near field communication (NFC) device, a signal with a modulated portion and an unmodulated portion from a second NFC device, wherein the signal comprises a carrier reference signal; and
recovering, by the first NFC device, the carrier reference signal received from the second NFC device, wherein the recovering comprises;
during the modulated portion of the signal for each bit, maintaining, by the first NFC device, a phase of the received carrier reference signal; and
during the unmodulated portion of the signal for each bit, synchronizing, by the first NFC device, to the received carrier reference signal.
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Abstract
An example method for active load modulation includes determining a modulated portion and an unmodulated portion of a bit. Further, the example method includes during the modulated portion of the bit, holding a phase of a received carrier signal. In addition, the example method includes, during the unmodulated portion of the bit, synchronizing to the received carrier signal.
21 Citations
22 Claims
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1. A method for active load modulation, comprising:
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receiving, at a first near field communication (NFC) device, a signal with a modulated portion and an unmodulated portion from a second NFC device, wherein the signal comprises a carrier reference signal; and recovering, by the first NFC device, the carrier reference signal received from the second NFC device, wherein the recovering comprises; during the modulated portion of the signal for each bit, maintaining, by the first NFC device, a phase of the received carrier reference signal; and during the unmodulated portion of the signal for each bit, synchronizing, by the first NFC device, to the received carrier reference signal. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for active load modulation, comprising:
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a memory storing executable instructions; and a processor in communication with the memory, wherein the processor is configured to execute the instructions to; receive a signal with a modulated portion and an unmodulated portion, wherein the signal comprises a carrier reference signal; and recover the received carrier reference signal, wherein the processor is further configured to execute the instructions to; maintain a phase of the received carrier reference signal during the modulated portion of the signal for each bit; and synchronize to the received carrier reference signal during the unmodulated portion of the signal for each bit. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An apparatus for active load modulation, comprising:
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means for receiving a signal with a modulated portion and an unmodulated portion, wherein the signal comprises a carrier reference signal; and means for recovering the received carrier reference signal, wherein the means for recovering comprises; means for maintaining a phase of the received carrier reference signal during the modulated portion of the signal for each bit; and means for synchronizing to the received carrier reference signal during the unmodulated portion of the signal for each bit. - View Dependent Claims (14, 15, 16, 17)
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18. A non-transitory computer-readable medium comprising instructions, that when executed by a processor, cause the processor to:
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receive a signal with a modulated portion and an unmodulated portion, wherein the signal comprises a carrier reference signal; and recover the received carrier reference signal, wherein the non-transitory computer-readable medium comprises further instructions, that when executed by the processor, cause the processor to; maintain a phase of the received carrier reference signal during the modulated portion of the signal for each bit; and synchronize to the received carrier reference signal during the unmodulated portion of the signal for each bit. - View Dependent Claims (19, 20, 21, 22)
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Specification