Patents by Inventor Shyamnath Gollakota

Shyamnath Gollakota 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).

  • 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
  • Publication number: 20200297273
    Abstract: Systems and methods of identifying medical disorders in one or more subjects are disclosed herein. In one embodiment, sound is transmitted toward a subject and at least a portion of the sound reflected by the subject and is acquired as echo data. The acquired echo data is used to generate a motion waveform having a plurality of peaks detected therein. At least a portion of the plurality of peaks may be indicative of movement of the subject. One or more medical disorders in the subject can be identified based on, for example, time durations and/or amplitude changes between peaks detected in the motion waveform.
    Type: Application
    Filed: March 31, 2020
    Publication date: September 24, 2020
    Inventors: Shyamnath Gollakota, Rajalakshmi Nandakumar, Nathaniel F. Watson
  • Publication number: 20200212956
    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.
    Type: Application
    Filed: August 12, 2016
    Publication date: July 2, 2020
    Applicant: University of Washington
    Inventors: Shyamnath Gollakota, Bryce Kellogg, Vamsi Talla, Joshua R. Smith
  • Publication number: 20200161904
    Abstract: Systems and methods for wirelessly transmitting power across a room or space are disclosed herein. One such system is comprised of a power receiving element positioned to receive wireless power transfer, comprised of a power receiving cell and a retroreflector positioned proximate the power receiving cell, and a power transmission element configured to wirelessly transmit power towards the power receiving element. The power transmission element includes an optical power transmitter configured to emit a first laser beam with a first power density towards the receiving cell, a guard beam emitter positioned proximate the optical power transmitter and configured to emit a second laser beam with a second power density towards the retroreflectors, a light detector positioned proximate the guard beam emitter and configured to detect light reflected by the retroreflectors, and an interlock system configured to interrupt power transmission when a decrease in light incident from the retroreflectors is detected.
    Type: Application
    Filed: November 21, 2019
    Publication date: May 21, 2020
    Inventors: Shyamnath Gollakota, Vikram Subramaniam Iyer, Arka Majumdar, Elyas Bayati, Rajalakshmi Nandakumar
  • Patent number: 10652073
    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.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: May 12, 2020
    Assignee: University of Washington
    Inventors: Vamsi Talla, Joshua R. Smith, Shyamnath Gollakota, Bryce Kellogg
  • Patent number: 10638972
    Abstract: Systems and methods of identifying medical disorders in one or more subjects are disclosed herein. In one embodiment, sound is transmitted toward a subject and at least a portion of the sound reflected by the subject and is acquired as echo data. The acquired echo data is used to generate a motion waveform having a plurality of peaks detected therein. At feast a portion of the plurality of peaks may be indicative of movement of the subject. One or more medical disorders in the subject can be identified based on, for example, time durations and/or amplitude changes between peaks detected in the motion waveform.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: May 5, 2020
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Rajalakshmi Nandakumar, Nathaniel F. Watson
  • Patent number: 10587445
    Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: March 10, 2020
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Aaron N. Parks, Angli Liu
  • Patent number: 10547484
    Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: January 28, 2020
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Aaron N. Parks, Angli Liu
  • Patent number: 10447331
    Abstract: Apparatuses, systems, ambient backscatter transceivers, and methods for modulating a backscatter of an ambient RF signal are described. An example system may include an ambient backscatter transceiver comprising an antenna that is configured to receive a backscattered ambient radio frequency (RF) signal. The ambient backscatter transceiver is configured to demodulate the backscattered ambient RF signal to retrieve first data. The backscattered ambient RF signal is generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal is encoded with modulated to provide second data at a second frequency.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: October 15, 2019
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Vincent Liu, Aaron N. Parks, Vamsi Talla
  • Patent number: 10383126
    Abstract: Examples described herein include wireless transmitters configured for power transmission. Example wireless transmitters may insert power packets into wireless communications such that power harvesting circuitry may harvest sufficiently continuous power from the wireless communication signals. Example power harvesting circuitry is configured to harvest power across multiple wireless communication channels. Example chargers are described which may harvest power from wireless communication signals (e.g. Wi-Fi signals).
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: August 13, 2019
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Vamsi Talla, Bryce Kellogg, Ben Ransford, Saman Naderiparizi, Joshua R. Smith
  • Patent number: 10382161
    Abstract: Example devices described herein include endpoint devices which may communicate with an access point device by modulating a channel associated with the wireless communication to encode transmit data. The channel modulation may be performed by utilizing a switch to control an impedance of an antenna at the endpoint device to either reflect or absorb wireless network communication signals received by the endpoint device. The access point device may extract the transmit data by decoding changes in the channel caused, at least in part, by the modulation. Access point devices may transmit a pattern of packets—the presence or absence of which may correspond with transmit data. Endpoint devices may decode this data by using an energy detector to differentiate between the presence or absence of a packet.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: August 13, 2019
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, David Wetherall, Bryce Kellogg, Aaron N. Parks
  • Patent number: 10270639
    Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: April 23, 2019
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Aaron N. Parks, Angli Liu
  • Publication number: 20190116078
    Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
    Type: Application
    Filed: December 7, 2018
    Publication date: April 18, 2019
    Applicant: UNIVERSITY OF WASHINGTON
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Aaron N. Parks, Angli Liu
  • Patent number: 10187177
    Abstract: Example devices described herein include endpoint devices which may communicate with an access point device by modulating a channel associated with the wireless communication to encode transmit data. The channel modulation may be performed by utilizing a switch to control an impedance of an antenna at the endpoint device to either reflect or absorb wireless network communication signals received by the endpoint device. The access point device may extract the transmit data by decoding changes in the channel caused, at least in part, by the modulation. Access point devices may transmit a pattern of packets—the presence or absence of which may correspond with transmit data. Endpoint devices may decode this data by using an energy detector to differentiate between the presence or absence of a packet.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: January 22, 2019
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, David Wetherall, Bryce Kellogg, Aaron N. Parks
  • Patent number: 10187241
    Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: January 22, 2019
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Aaron N. Parks, Angli Liu
  • Publication number: 20180375703
    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.
    Type: Application
    Filed: January 26, 2017
    Publication date: December 27, 2018
    Applicant: University of Washington
    Inventors: Bryce Kellogg, Joshua R. Smith, Shyamnath Gollakota, Vamsi Talla, Vikram S. Iyer
  • Publication number: 20180358996
    Abstract: Apparatuses, systems, ambient backscatter transceivers, and methods for modulating a backscatter of an ambient RF signal are described. An example system may include an ambient backscatter transceiver comprising an antenna that is configured to receive a backscattered ambient radio frequency (RF) signal. The ambient backscatter transceiver is configured to demodulate the backscattered ambient RF signal to retrieve first data. The backscattered ambient RF signal is generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal is encoded with modulated to provide second data at a second frequency.
    Type: Application
    Filed: July 24, 2018
    Publication date: December 13, 2018
    Applicant: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Vincent Liu, Aaron N. Parks, Vamsi Talla
  • Publication number: 20180241604
    Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
    Type: Application
    Filed: April 20, 2018
    Publication date: August 23, 2018
    Applicant: UNIVERSITY OF WASHINGTON
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Aaron N. Parks, Angli Liu
  • Patent number: 10033424
    Abstract: Apparatuses, systems, ambient backscatter transceivers, and methods for modulating a backscatter of an ambient RF signal are described. An example system may include an ambient backscatter transceiver comprising an antenna that is configured to receive a backscattered ambient radio frequency (RF) signal. The ambient backscatter transceiver is configured to demodulate the backscattered ambient RF signal to retrieve first data. The backscattered ambient RF signal is generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal is encoded with modulated to provide second data at a second frequency.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: July 24, 2018
    Assignee: University of Washington
    Inventors: Shyamnath Gollakota, Joshua R. Smith, Vincent Liu, Aaron N. Parks, Vamsi Talla
  • Patent number: 9971414
    Abstract: Examples of systems, devices, and methods are described herein that can provide for gesture recognition. Wireless communication signals are received from sources in an environment (e.g. cellular telephones, computers, etc.). Features of the wireless communication signals (e.g. Doppler shifts) are extracted and utilized to identify gestures. The use of wireless communication signals accordingly make possible gesture recognition in a whole-home environment that identifies gestures performed through walls or other obstacles.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: May 15, 2018
    Assignee: University of Washington Through Its Center For Commercialization
    Inventors: Shyamnath Gollakota, Shwetak N. Patel, Qifan Pu, Sidhant Gupta