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US 2019/0158341 A1Published application
Backscatter devices and systems providing backscattered signals including ofdm packets
AssigneeUniversity of Washington
InventorsVamsi Talla, Joshua R, Smith, Shyamnath Gollskota, Bryce Kellogg
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Abstract
Examples described herein include backscatter devices which may transmit orthogonal frequency division multiplexing (OFDM) signals. Techniques for complex analog backscatter are described. Examples of impedance circuitry are described which may be used to provide real and imaginary components of impedance in accordance with inphase and quadrature bits.
Claims23
A backscatter device comprising:
- an antenna;
- baseband circuitry configured to provide inphase bits and quadrature bits corresponding to data for transmission;
- first circuitry coupled to the antenna and the baseband circuitry and configured to provide a real component of antenna impedance corresponding to the inphase bits;
- and
- second circuitry coupled to the antenna and the baseband circuitry and configured to provide an imaginary component of the antenna impedance corresponding to the quadrature bits.
2 more elements
A system comprising:
- a helper device configured to transmit a carrier signal;
- and
- a backscatter device comprising:
- an antenna positioned such that the carrier signal is incident on the antenna;
- baseband circuitry configured to provide inphase bits and quadrature bits based on data for transmission;
- and
- impedance circuitry configured to provide a real component of antenna impedance corresponding to the inphase bits and a complex component of the antenna impedance corresponding to the quadrature bits, such that the backscatter device is configured to backscatter the carrier signal to form a backscatter signal including orthogonal frequency division multiplexing (OFDM) packets.
4 more elements
A method comprising:
- generating data for transmission at a backscatter device;
- performing baseband operations on the data to generate inphase and quadrature bits corresponding to the data;
- and
- modulating an impedance of an antenna to backscatter an incident carrier signal in accordance with the inphase and quadrature bits to provide a backscattered signal including OFDM packets corresponding to the data.
1 more element
Dependencies are inferred from the claim text.