Patents by Inventor Dinesh Bharadia

Dinesh Bharadia 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).

  • Publication number: 20200326362
    Abstract: A method, a system, and a computer program for executing high resolution spectrum monitoring. A sensor receives an input signal having a varying frequency content over time. One or more samples of the received input signal are sampled. The samples of the received input signal include one or more swept signal samples generated by sweeping, using a center frequency of the sensor, the received input signal across an entire frequency spectrum associated with the received input signal. Sampling of the samples of the received signal is performed while performing the sweeping. The signal samples are processed.
    Type: Application
    Filed: April 15, 2020
    Publication date: October 15, 2020
    Inventors: Yeswanth Reddy Guddeti, Dinesh Bharadia, Moein Khazraee, Aaron Shalev, Raghav Vaidyanathan Subbaraman
  • Publication number: 20200213971
    Abstract: A method, a system, and a computer program product for determining a location of a communication device. Data corresponding to a detected transmission of a data packet between a tag device and one or more communication devices is received on one or more communication channels. At least one of a channel state information and a signal strength associated with the detected transmission for each frequency band in a plurality of frequency bands are determined. Based on the determined channel state information, one or more lengths of signal paths corresponding to the detected transmission of the data packet are determined. A shortest length in across one or more communication devices is selected to determine a location of the tag device.
    Type: Application
    Filed: December 31, 2019
    Publication date: July 2, 2020
    Inventors: Sai Roshan Ayyalasomayajula, Dinesh Bharadia, Deepak Vasisht, Dina Katabi
  • Publication number: 20190274144
    Abstract: A backscatter tag device includes, in part, a receiver configured to receive a packet conforming to a communication protocol defining a multitude of codewords, a codeword translator configured to translate at least a first subset of the multitude of codewords disposed in the packet to a second multitude of codewords defined by the protocol in response to a data the backscatter tag is invoked to transmit, and a transmitter configured to transmit the packet supplied by the codeword translator at a frequency different than the first frequency at which the packer is received. The communication protocol may optionally be the 802.11 g/n, ZigBee or the Bluetooth communication protocol.
    Type: Application
    Filed: October 25, 2017
    Publication date: September 5, 2019
    Applicant: The Board of Trustees of the Leland Standford Junior University
    Inventors: Pengyu ZHANG, Dinesh BHARADIA, Sachin KATTI
  • Patent number: 10338205
    Abstract: A backscatter tag communicate device includes, in part, a receiver configured to receive a WiFi packet conforming to a communication protocol defining a multitude of codewords, a mapper configured to map at least a first subset of the multitude of codewords disposed in the packet to a second multitude of codewords defined by the protocol, and a frequency shifter configured to shift a frequency of the second multitude of codewords such that the frequency shifted codewords are characterized by a single sideband spectrum. The communication protocol may be the 802.11b communication protocol. The mapper may optionally map the first subset of the multitude of codewords by changing phases of the first subset of the multitude of codewords.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: July 2, 2019
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Pengyu Zhang, Dinesh Bharadia, Kiran Joshi, Sachin Katti
  • Patent number: 10284356
    Abstract: A wireless communication device includes, in part, an analog interference cancellation circuit and a controller. The analog cancellation circuit includes a multitude of delay paths each including a delay element and a variable attenuator. The controller dynamically varies the attenuation level of each of the variable attenuators in accordance with the frequency response characteristic of that attenuator to remove a portion of a self-interference signal present in a signal received by the device. The device measures the frequency response characteristic of the communication channel, used in determining the attenuation levels, via one or more preamble symbols. A second portion of the self-interference signal is removed by the device using a multitude of samples of a transmitted signal and a multitude of samples of a signal to be transmitted.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: May 7, 2019
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Dinesh Bharadia, Sachin Katti, Emily McMilin, Mayank Jain, Jung Il Choi, Kannan Srinivasan
  • Patent number: 10243719
    Abstract: A MIMO wireless communication device includes, in part, a first transmit path adapted to transmit a first transmit signal from a first antenna, a second transmit path adapted to transmit a second transmit signal from a second antenna, a first receive path adapted to receive a first receive signal, an interference cancellation circuit and a controller. The cancellation circuit includes a cascaded filter structure each filter including a multitude of filter taps each including a variable element. The controller dynamically varies a value applied to each of the plurality of variable elements in accordance with frequency response characteristics of the variable element to remove a portion of a self-interference and/or cross-talk interference signal present in a signal received by the device.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: March 26, 2019
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Dinesh Bharadia, Sachin Katti
  • Patent number: 10230419
    Abstract: In one aspect there is provided a method. The method may include receiving a first analog radio frequency signal including a signal of interest and an interference signal caused by a second analog radio frequency signal transmitted in full duplex over a channel from which the first analog transmission is received; adjusting at least one of the first analog radio frequency signal and a portion of the second analog radio frequency signal to enable at least one of a reduction or an elimination of the interference signal in an output analog radio frequency signal; combining the first analog radio frequency signal and the portion of the second analog radio frequency signal to generate the output analog radio frequency signal characterized by at least the reduction or the elimination of the interference signal included in the output analog radio frequency signal; and providing the output analog radio frequency signal. Related apparatus, systems, methods, and articles are also described.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: March 12, 2019
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Dinesh Bharadia, Jung-Il Choi, Mayank Jain, Sachin Katti, Tae Min Kim, Philip Levis
  • Patent number: 10230422
    Abstract: A system for frequency isolation modified self-interference cancellation includes a transmit coupler, that samples an RF transmit signal; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; a receive coupler that combines the RF self-interference cancellation signal with the RF receive signal to form a reduced-interference receive signal; and a frequency shifter that frequency shifts only one of the RF transmit signal and the reduced-interference receive signal.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: March 12, 2019
    Assignee: Kumu Networks, Inc.
    Inventors: Dinesh Bharadia, Jeffrey Mehlman, Wilhelm Steffen Hahn
  • Patent number: 10116405
    Abstract: A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made of an interference value based on a group of interference signals received at a receiver from a group of transmitters, wherein the interference value is based on channel gains that are estimated for the group of transmitters, and wherein a portion of the interference is self-interference generated from transmitting and receiving at a same time. One of an analog time domain cancellation, a digital time domain cancellation or both, is performed responsive to a determination that the interference value does not satisfy a threshold range of an analog-to-digital converter of the receiver. Other embodiments are disclosed.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: October 30, 2018
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Vaneet Aggarwal, Dinesh Bharadia, Rittwik Jana, Christopher W. Rice, Nemmara K. Shankaranarayanan
  • Publication number: 20180212807
    Abstract: A backscatter tag communicate device includes, in part, a receiver configured to receive a WiFi packet conforming to a communication protocol defining a multitude of codewords, a mapper configured to map at least a first subset of the multitude of codewords disposed in the packet to a second multitude of codewords defined by the protocol, and a frequency shifter configured to shift a frequency of the second multitude of codewords such that the frequency shifted codewords are characterized by a single sideband spectrum. The communication protocol may be the 802.11b communication protocol. The mapper may optionally map the first subset of the multitude of codewords by changing phases of the first subset of the multitude of codewords.
    Type: Application
    Filed: August 14, 2017
    Publication date: July 26, 2018
    Inventors: Pengyu ZHANG, Dinesh BHARADIA, Kiran JOSHI, Sachin KATTI
  • Publication number: 20170353212
    Abstract: A system for frequency isolation modified self-interference cancellation includes a transmit coupler, that samples an RF transmit signal; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; a receive coupler that combines the RF self-interference cancellation signal with the RF receive signal to form a reduced-interference receive signal; and a frequency shifter that frequency shifts only one of the RF transmit signal and the reduced-interference receive signal.
    Type: Application
    Filed: August 24, 2017
    Publication date: December 7, 2017
    Inventors: Dinesh Bharadia, Jeffrey Mehlman, Wilhelm Steffen Hahn
  • Patent number: 9832003
    Abstract: A system for self-interference canceller tuning includes a transmit coupler that creates a sampled analog transmit signal; an analog self-interference canceller that transforms the sampled analog transmit signal to an analog self-interference cancellation signal according to a set of tuning parameters, the set of tuning parameters comprising complex weights for a set of taps of the analog self-interference canceller; a tuning circuit that calculates the set of tuning parameters, and applies the set of tuning parameters to the analog self-interference canceller based on component calibration data of the analog self-interference canceller; and a receive coupler that combines the analog self-interference cancellation signal with the analog receive signal to reduce self-interference in the analog receive signal.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: November 28, 2017
    Assignee: Kumu Networks, Inc.
    Inventors: Dinesh Bharadia, Jung-Il Choi, Mayank Jain
  • Patent number: 9774405
    Abstract: A system for frequency-isolated self-interference cancellation includes a transmit coupler, that samples an RF transmit signal to create a sampled RF transmit signal having a first RF carrier frequency, an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal, a receive coupler, that combines the RF self-interference cancellation signal with an RF receive signal to form a reduced-interference receive signal, and a frequency shifter.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: September 26, 2017
    Assignee: Kumu Networks, Inc.
    Inventors: Dinesh Bharadia, Jeffrey Mehlman, Wilhelm Steffen Hahn
  • Publication number: 20170264420
    Abstract: A system for self-interference canceller tuning includes a transmit coupler that creates a sampled analog transmit signal; an analog self-interference canceller that transforms the sampled analog transmit signal to an analog self-interference cancellation signal according to a set of tuning parameters, the set of tuning parameters comprising complex weights for a set of taps of the analog self-interference canceller; a tuning circuit that calculates the set of tuning parameters, and applies the set of tuning parameters to the analog self-interference canceller based on component calibration data of the analog self-interference canceller; and a receive coupler that combines the analog self-interference cancellation signal with the analog receive signal to reduce self-interference in the analog receive signal.
    Type: Application
    Filed: May 30, 2017
    Publication date: September 14, 2017
    Inventors: Dinesh Bharadia, Jung-Il Choi, Mayank Jain
  • Publication number: 20170257180
    Abstract: A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made of an interference value based on a group of interference signals received at a receiver from a group of transmitters, wherein the interference value is based on channel gains that are estimated for the group of transmitters, and wherein a portion of the interference is self-interference generated from transmitting and receiving at a same time. One of an analog time domain cancellation, a digital time domain cancellation or both, is performed responsive to a determination that the interference value does not satisfy a threshold range of an analog-to-digital converter of the receiver. Other embodiments are disclosed.
    Type: Application
    Filed: May 23, 2017
    Publication date: September 7, 2017
    Inventors: Vaneet Aggarwal, Dinesh Bharadia, Rittwik Jana, Christopher W. Rice, Nemmara K. Shankaranarayanan
  • Patent number: 9712312
    Abstract: A method for self-interference canceller tuning for a near band radio includes receiving, in a first frequency band, an RF transmit signal of the near band radio; receiving, in a second frequency band, an RF receive signal of the near band radio; generating a self-interference cancellation signal from the RF transmit signal based on a set of configuration parameters; combining the self-interference cancellation signal with the RF receive signal to create a composite receive signal; and adapting the set of configuration parameters based on the compo-site receive signal.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: July 18, 2017
    Assignee: Kumu Networks, Inc.
    Inventors: Jung-Il Choi, Mayank Jain, Dinesh Bharadia, Jeffrey Mehlman, Steven Hong
  • Patent number: 9698860
    Abstract: A method for tuning an analog self-interference canceller includes detecting a tuning trigger, calculating a set of tuning parameters (the tuning parameters including complex weights for a set of taps of the analog self-interference canceller) in response to the tuning trigger, and applying the set of tuning parameters based on component calibration data.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: July 4, 2017
    Assignee: Kumu Networks, Inc.
    Inventors: Dinesh Bharadia, Jung-Il Choi, Mayank Jain
  • Publication number: 20170187513
    Abstract: A wireless communication device includes, in part, an analog interference cancellation circuit and a controller. The analog cancellation circuit includes a multitude of delay paths each including a delay element and a variable attenuator. The controller dynamically varies the attenuation level of each of the variable attenuators in accordance with the frequency response characteristic of that attenuator to remove a portion of a self-interference signal present in a signal received by the device. The device measures the frequency response characteristic of the communication channel, used in determining the attenuation levels, via one or more preamble symbols. A second portion of the self-interference signal is removed by the device using a multitude of samples of a transmitted signal and a multitude of samples of a signal to be transmitted.
    Type: Application
    Filed: August 11, 2014
    Publication date: June 29, 2017
    Inventors: Dinesh BHARADIA, Sachin KATTI, Emily McMILIN
  • Patent number: 9692540
    Abstract: A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made as to whether the interference satisfies a threshold range of an analog-to-digital converter of the receiver for each of the group of transmitters. An analog time domain cancellation is performed responsive to a determination that the interference does not satisfy the threshold range, and a digital time domain cancellation is performed responsive to a determination that the interference satisfies the threshold range. Other embodiments are disclosed.
    Type: Grant
    Filed: August 17, 2016
    Date of Patent: June 27, 2017
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Vaneet Aggarwal, Dinesh Bharadia, Rittwik Jana, Christopher W. Rice, Nemmara K. Shankaranarayanan
  • Publication number: 20170090026
    Abstract: Techniques for a motion tracing device using radio frequency signals are presented. The motion tracing device utilizes radio frequency signals, such as WiFi to identify moving objects and trace their motion. Methods and apparatus are defined that can measure multiple WiFi backscatter signals and identify the backscatter signals that correspond to moving objects. In addition, motion of a plurality of moving objects can be detected and traced for a predefined duration of time.
    Type: Application
    Filed: May 4, 2015
    Publication date: March 30, 2017
    Inventors: Kiran Joshi, Dinesh Bharadia, Sachin Katti, Manikanta Kotaru