University of Washington

Mehrdad Hessar

Joshua R Smith

Shyamnath Gollakota

Vamsi Talla

Saman Naderiparizi

Bryce Kellogg

Ali Najafi

Examples described herein include systems, devices, and methods for backscattering carrier signals in accordance with pixel values of an image and/or video. Signals having a property proportionate to pixel values may be converted into a pulse-containing waveform having pulses whose widths and/or duty cycles are determined based on the pixel values. Backscatter transmitters may backscatter a carrier signal in accordance with the pulse-containing waveform to provide the pixel values to a receiver. In this manner, video transmission at low power and/or battery-free operation may be provided.

Image and/or video transmission using backscatter devices

Examples of backscatter systems, device, and techniques are described herein. Example backscatter devices may utilize CSS modulation to provide backscatter signals including CSS signals (e.g., LoRa packets). Utilizing CSS modulation may advantageously allow for backscatter communication over wide areas. Examples of backscatter devices described herein may toggle the impedance of the backscatter device between multiple (e.g., eight) impedances to reduce and/or eliminate higher order harmonic components in the backscatter signal (e.g., third and fifth harmonic components).

Backscatter systems, devices, and techniques utilizing CSS modulation and/or higher order harmonic cancellation

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Seattle, WA, United States of America

Mehrdad Hessar