Patents by Inventor Mehrdad Hessar

Mehrdad Hessar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Image and/or video transmission using backscatter devices
    Patent number: 11212479
    Abstract: 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.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: December 28, 2021
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Saman Naderiparizi, Mehrdad Hessar, Vamsi Talla, Joshua R. Smith
  • IMAGE AND/OR VIDEO TRANSMISSION USING BACKSCATTER DEVICES
    Publication number: 20210084251
    Abstract: 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.
    Type: Application
    Filed: April 6, 2018
    Publication date: March 18, 2021
    Applicant: University of Washington
    Inventors: Shyamnath Gollakota, Saman Naderiparizi, Mehrdad Hessar, Vamsi Talla, Joshua R. Smith
  • Backscatter systems, devices, and techniques utilizing CSS modulation and/or higher order harmonic cancellation
    Patent number: 10812130
    Abstract: 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).
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: October 20, 2020
    Assignee: University of Washington
    Inventors: Vamsi Talla, Mehrdad Hessar, Joshua R. Smith, Shyamnath Gollakota, Ali Najafi, Bryce Kellogg
  • BACKSCATTER SYSTEMS, DEVICES, AND TECHNIQUES UTILIZING CSS MODULATION AND/OR HIGHER ORDER HARMONIC CANCELLATION
    Publication number: 20200052734
    Abstract: 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).
    Type: Application
    Filed: October 10, 2017
    Publication date: February 13, 2020
    Inventors: Vamsi Talla, Mehrdad Hessar, Joshua R, Smith, Shyamnath Goliakota, Ali Najafi, Bryce Kellogg