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US 10,951,446 B2Granted
Backscatter devices including examples of single sideband operation
AssigneeUniversity of Washington
InventorsBryce Kellogg, Joshua R. Smith, Shyamnath Gollakota, Vamsi Talla, Vikram S. Iyer
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Abstract
Examples described herein include devices and systems utilizing backscatter communication to generate transmissions in accordance with wireless communication protocols. Examples are described including single sideband operation, generation of a carrier wave using Bluetooth, downlink communication to a backscatter device, and combinations thereof.
Claims11
A backscatter device comprising:
- an antenna configured to backscatter a carrier signal having a first frequency;
- baseband circuitry configured to provide data for transmission, including an in-phase component and a quadrature component;
- a waveform generator configured to provide a waveform having a second frequency, wherein the second frequency is an absolute difference between the first frequency and a third frequency;
- a sub-carrier phase modulator coupled to the baseband circuitry and the waveform generator, the sub-carrier phase modulator configured to adjust a phase, amplitude, or combinations thereof, of the waveform in accordance with the data to provide an output signal, and
- a switch coupled to the antenna, the switch configured to:
- control an impedance of the backscatter device to backscatter the carrier signal in accordance with the output signal such that the first frequency is mixed with the second frequency to transmit the data in a backscatter signal in a single sideband at the third frequency, and
- control the impedance of the backscatter device to imitate multiplication of the in-phase component and the quadrature component with a complex signal.
4 more elements
Dependencies are inferred from the claim text.