Protection of near-field communication exchanges
First Claim
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1. A transmitter for protecting a first near-field communication (NFC) signal transmitted by a mobile device, the transmitter comprising:
- a first transmit circuit configured to generate the first NFC signal;
a second transmit circuit configured to;
generate a first blocking signal having a carrier frequency of the first NFC signal; and
modulate the first blocking signal with a type of amplitude modulation of the first NFC signal; and
an NFC antenna;
communicatively coupled with the first transmit circuit so as to transmit the first NFC signal, andconfigured to be coupled with the mobile device; and
a second antenna;
communicatively coupled to the second transmit circuit so as to transmit the first blocking signal while the first NFC signal is transmitted, andconfigured to be coupled with the mobile device.
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Abstract
Techniques are disclosed for protecting communication of an NFC-enabled device by generating one or more blocking signals during an NFC data exchange. The blocking signal(s) can include a similar carrier frequency, modulation type, and/or modulation rate an NFC signal, thereby effectively masking the NFC signal. Furthermore, the blocking signal(s) can have a varying amplitude and/or length, which can further mask when an NFC signal is transmitted.
40 Citations
20 Claims
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1. A transmitter for protecting a first near-field communication (NFC) signal transmitted by a mobile device, the transmitter comprising:
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a first transmit circuit configured to generate the first NFC signal; a second transmit circuit configured to; generate a first blocking signal having a carrier frequency of the first NFC signal; and modulate the first blocking signal with a type of amplitude modulation of the first NFC signal; and an NFC antenna; communicatively coupled with the first transmit circuit so as to transmit the first NFC signal, and configured to be coupled with the mobile device; and a second antenna; communicatively coupled to the second transmit circuit so as to transmit the first blocking signal while the first NFC signal is transmitted, and configured to be coupled with the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of protecting near-field communication (NFC) signals, the method comprising:
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generating a first NFC signal; generating a first blocking signal at a carrier frequency of the first NFC signal generated by a mobile device such that the first blocking signal has a varying amplitude; modulating the first blocking signal with a certain modulation having the same amplitude modulation type and modulation rate of the first NFC signal; driving an NFC antenna coupled to the mobile device to transmit the first NFC signal; and driving a second antenna coupled to the mobile device to transmit the modulated first blocking signal while the mobile device transmits the first NFC signal. - View Dependent Claims (17, 18)
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19. A mobile device comprising:
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an NFC antenna; a signal-blocking antenna; and a processing unit coupled to the NFC antenna and the signal-blocking antenna, the processing unit configured to perform functions including; causing the NFC antenna to transmit an NFC signal having a carrier frequency, a modulation rate, and a modulation type; generating a blocking signal at the carrier frequency of the NFC signal; modulating the blocking signal with a certain modulation having the same carrier frequency, modulation rate, and modulation type as the NFC signal; and causing the signal-blocking antenna to transmit the modulated blocking signal while the NFC antenna is transmitting the NFC signal. - View Dependent Claims (20)
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Specification