Backscatter devices and network systems incorporating backscatter devices
AssigneeUniversity of Washington
InventorsShyamnath Gollakota, Bryce Kellogg, Vamsi Talla, Joshua R. Smith
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Abstract
Examples described herein include devices and systems utilizing backscatter communication to directly generate transmissions in accordance with wireless communication protocols that can be decoded existing devices. Examples include devices that generate 802.11b transmissions using backscatter communication. Examples of network stacks are described which may facilitate backscatter devices to coexist with other devices (e.g. in the ISM band), without incurring, or reducing a need for, the power consumption or carrier sense and medium access control operations.
Claims21
A backscatter device comprising:
- an antenna configured to backscatter a carrier signal having a first frequency;
- baseband circuitry configured to provide data for transmission,
- a waveform generator configured to provide a waveform having a second frequency, wherein the second frequency is a 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 the antenna 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 at the third frequency.
A backscatter device comprising:
- an antenna, the antenna configured to backscatter a frequency hopped signal including a first frequency;
- baseband circuitry configured to provide data for transmission;
- a waveform generator configured to pros ide a waveform having a second frequency and further configured to hop the second frequency in accordance with the frequency hopped signal;
- a sub-carrier phase modulator coupled to the baseband circuitry and the waveform generator, the sub-carrier phase modulator configured to ad use 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 the antenna 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 at a third frequency.
15-49. (canceled)
A system comprising:
- a helper device configured to transmit a carrier signal including a first frequency;
- a backscatter device configured to backscatter the carrier signal using sub-carrier modulation with a waveform having a second frequency, the backscatter device configured to backscatter the carrier signal into a backscatter signal at a third frequency, the third frequency equal to a combination of the first and second frequencies;
- and
- a receiver configured to receive the backscatter signal at the third frequency.
Dependencies are inferred from the claim text.