Ambient backscatter transceivers, apparatuses, systems, and methods for communicating using backscatter of ambient RF signals
First Claim
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1. A system comprising:
- a backscatter transceiver comprising;
an antenna configured to receive a radio frequency (RF) signal;
a demodulator coupled to the antenna, the demodulator comprising a threshold circuit configured to compare variations in the RF signal representative of a first backscattered RF signal, wherein the demodulator is configured to demodulate the first backscattered RF signal in part using the threshold circuit to retrieve at least one first impedance state; and
a transmitter configured to modulate an impedance of the antenna to provide a second backscattered ambient RF signal encoded with modulated symbols indicative of at least one second impedance state associated with the antenna.
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Abstract
Apparatuses, systems, ambient backscatter transceivers, and methods for modulating a backscatter of an ambient RF signal are described. An example system may include an ambient backscatter transceiver comprising an antenna that is configured to receive a backscattered ambient radio frequency (RF) signal. The ambient backscatter transceiver is configured to demodulate the backscattered ambient RF signal to retrieve first data. The backscattered ambient RF signal is generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal is encoded with modulated to provide second data at a second frequency.
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Citations
20 Claims
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1. A system comprising:
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a backscatter transceiver comprising; an antenna configured to receive a radio frequency (RF) signal; a demodulator coupled to the antenna, the demodulator comprising a threshold circuit configured to compare variations in the RF signal representative of a first backscattered RF signal, wherein the demodulator is configured to demodulate the first backscattered RF signal in part using the threshold circuit to retrieve at least one first impedance state; and a transmitter configured to modulate an impedance of the antenna to provide a second backscattered ambient RF signal encoded with modulated symbols indicative of at least one second impedance state associated with the antenna. - View Dependent Claims (2, 3, 4)
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5. An apparatus comprising:
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an antenna configured to receive a radio frequency (RF) signal; a receiver coupled to the antenna and configured to compute variations of the RF signal to generate output bits, the variations representative of a first backscattered RF signal; a microcontroller coupled to the receiver and configured to decode, at least in part using a threshold circuit, the output bits to retrieve first data associated with the first backscattered RF signal; and a transmitter configured to selectively modulate an impedance of the antenna at a modulation rate to provide a second backscattered RF signal encoded with second data. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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receiving a backscattered radio frequency (RF) signal at an antenna, the backscattered RF signal encoded with first impedance data; demodulating the backscattered RF signal to generate output bits, wherein demodulating the backscattered ambient RF signal comprises using a threshold circuit configured to compare variations in the backscattered RF signal; decoding the output bits at a microcontroller to retrieve the first data; and modulating a phase or an amplitude of an ambient RF signal via the antenna to provide a second backscattered RF signal encoded with second data. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification