Modulation of a near-field communication signal
First Claim
Patent Images
1. A payment reader for communicating with a contactless payment device via a wireless data signal, the payment reader comprising:
- an antenna;
a processing unit configured to generate a carrier signal, wherein the processing unit is further configured to modify the carrier signal to generate a modulated signal, wherein the carrier signal is modified based on data to be transmitted to the contactless payment device and a modulation procedure, wherein the modulation procedure comprises a notch modulation procedure having a notch delay and a notch width, and wherein the processing unit is configured to select the notch delay and the notch width to determine a desired modulation index of the wireless data signal;
a transmit circuit configured to receive the modulated signal from the processing unit, generate the wireless data signal based on the modulated signal, and provide the wireless data signal to the antenna, wherein the antenna is configured to transmit the wireless data signal;
a receive circuit configured to receive a modulated wireless carrier signal and provide a received signal that is based on the modulated wireless carrier signal to the processing unit, wherein the modulated wireless carrier signal is based on the carrier signal, and wherein the processing unit is configured to determine received data based on the received signal.
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Abstract
A communication device has a processing unit, a transmit circuit, and an antenna. The processing unit generates a carrier signal and modifies the carrier signal based on a notch modulation procedure having notch delay and a notch width. The notch width is selected based on a desired modulation index. The resulting modulation signal is provided to the transmit circuit, which generates a wireless data signal that is transmitted by the antenna.
100 Citations
25 Claims
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1. A payment reader for communicating with a contactless payment device via a wireless data signal, the payment reader comprising:
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an antenna; a processing unit configured to generate a carrier signal, wherein the processing unit is further configured to modify the carrier signal to generate a modulated signal, wherein the carrier signal is modified based on data to be transmitted to the contactless payment device and a modulation procedure, wherein the modulation procedure comprises a notch modulation procedure having a notch delay and a notch width, and wherein the processing unit is configured to select the notch delay and the notch width to determine a desired modulation index of the wireless data signal; a transmit circuit configured to receive the modulated signal from the processing unit, generate the wireless data signal based on the modulated signal, and provide the wireless data signal to the antenna, wherein the antenna is configured to transmit the wireless data signal; a receive circuit configured to receive a modulated wireless carrier signal and provide a received signal that is based on the modulated wireless carrier signal to the processing unit, wherein the modulated wireless carrier signal is based on the carrier signal, and wherein the processing unit is configured to determine received data based on the received signal. - View Dependent Claims (2, 3, 4)
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5. A communication device comprising:
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an antenna; a processing unit configured to generate a carrier signal, wherein the processing unit is further configured to modify the carrier signal to generate a modulated signal, wherein the carrier signal is modified based on data to be transmitted and a modulation procedure, wherein the modulation procedure comprises a notch modulation procedure having a notch delay and a notch width, and wherein the processing unit is configured to select the notch width and the notch delay based on a desired modulation index of a wireless data signal; and a transmit circuit configured to receive the modulated signal, generate the wireless data signal based on the modulated signal, and provide the wireless data signal to the antenna, wherein the antenna is configured to transmit the wireless data signal. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for wireless communications comprising:
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generating a carrier signal; selecting a notch width of a notch modulation procedure and a notch delay of the notch modulation procedure, based on a desired modulation index of a wireless data signal; modulating the carrier signal based on data to be transmitted and the notch modulation procedure; generating the wireless data signal based on the modulated carrier signal; and transmitting the wireless data signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A non-transitory computer-readable storage medium comprising instructions stored therein, which when executed by one or more processors, cause the one or more processors to perform operations comprising:
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generating a carrier signal; selecting a notch width of a notch modulation procedure and a notch delay of the notch modulation procedure, based on a desired modulation index of a wireless data signal; modulating the carrier signal based on data to be transmitted and the notch modulation procedure; and providing the modulated carrier signal to a transmit circuit, wherein the transmit circuit is configured to generate the wireless data signal based on the modulated carrier signal. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification