Patents by Inventor Sachin Katti
Sachin Katti 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).
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Publication number: 20230103390Abstract: 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: ApplicationFiled: September 7, 2022Publication date: April 6, 2023Inventors: Pengyu ZHANG, Dinesh BHARADIA, Sachin KATTI
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Patent number: 11483836Abstract: 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: GrantFiled: October 25, 2017Date of Patent: October 25, 2022Assignee: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITYInventors: Pengyu Zhang, Dinesh Bharadia, Sachin Katti
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Patent number: 11209536Abstract: 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: GrantFiled: May 4, 2015Date of Patent: December 28, 2021Assignee: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITYInventors: Kiran Joshi, Dinesh Bharadia, Sachin Katti, Manikanta Kotaru
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Patent number: 11163050Abstract: Techniques for estimating one or more backscatter signals reflected from one or more objects are disclosed. In one example, a backscatter sensor includes, in part, a receiver for receiving a composite signal comprising one or more reflections of a transmitted signal, each reflection being reflected by one of a plurality of objects; and a processor configured to estimate at least a first backscatter component of the composite signal using a progressive interference cancellation technique. The first backscatter component of the composite signal corresponds to a reflection of the transmitted signal from a first object. In one embodiment, the backscatter sensor includes multiple receivers and/or one or more transmitters.Type: GrantFiled: November 14, 2014Date of Patent: November 2, 2021Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Dinesh Bharadia, Kiran Joshi, Sachin Katti
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Publication number: 20190274144Abstract: 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: ApplicationFiled: October 25, 2017Publication date: September 5, 2019Applicant: The Board of Trustees of the Leland Standford Junior UniversityInventors: Pengyu ZHANG, Dinesh BHARADIA, Sachin KATTI
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Patent number: 10338205Abstract: 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: GrantFiled: August 14, 2017Date of Patent: July 2, 2019Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Pengyu Zhang, Dinesh Bharadia, Kiran Joshi, Sachin Katti
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Patent number: 10284356Abstract: 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: GrantFiled: August 11, 2014Date of Patent: May 7, 2019Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Dinesh Bharadia, Sachin Katti, Emily McMilin, Mayank Jain, Jung Il Choi, Kannan Srinivasan
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Patent number: 10243719Abstract: 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: GrantFiled: September 29, 2014Date of Patent: March 26, 2019Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Dinesh Bharadia, Sachin Katti
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Patent number: 10243718Abstract: A system for processing signals includes an interference cancellation component that samples an RF transmit signal, transforms the sampled RF transmit signal into a self-interference cancellation signal, and combines the sampled RF transmit signal and self-interference cancellation signal to remove a first portion of interference from the RF receive signal, the combination forming a processed RF signal; and a filtering component that removes a second portion of interference from the processed signal by downconverting the processed RF signal to a processed baseband signal, sampling the processed baseband signal to create a processed digital signal, and filtering the processed digital signal to remove the second portion of interference.Type: GrantFiled: April 19, 2016Date of Patent: March 26, 2019Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Steven Hong, Sachin Katti, Jeff Mehlman
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Patent number: 10230419Abstract: 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: GrantFiled: November 9, 2011Date of Patent: March 12, 2019Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Dinesh Bharadia, Jung-Il Choi, Mayank Jain, Sachin Katti, Tae Min Kim, Philip Levis
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Publication number: 20180212807Abstract: 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: ApplicationFiled: August 14, 2017Publication date: July 26, 2018Inventors: Pengyu ZHANG, Dinesh BHARADIA, Kiran JOSHI, Sachin KATTI
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Patent number: 9887728Abstract: 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; combining the first analog radio frequency signal and a portion of the second analog radio frequency signal to generate an output analog radio frequency signal characterized by at least a reduction or an 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: GrantFiled: November 9, 2011Date of Patent: February 6, 2018Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Mayank Jain, Jung Il Choi, Kannan Srinivasan, Philip Levis, Sachin Katti, Siddharth Seth
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Publication number: 20170187513Abstract: 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: ApplicationFiled: August 11, 2014Publication date: June 29, 2017Inventors: Dinesh BHARADIA, Sachin KATTI, Emily McMILIN
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Publication number: 20170090026Abstract: 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: ApplicationFiled: May 4, 2015Publication date: March 30, 2017Inventors: Kiran Joshi, Dinesh Bharadia, Sachin Katti, Manikanta Kotaru
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Patent number: 9490963Abstract: A circuit that cancels a self-interference signal includes, in part, a pair of signal paths that are substantially in phase, each of which paths includes a passive coupler, a delay element and a variable attenuator. The circuit further includes, in part, a first group of P signal paths each of which is substantially in phase with the pair of paths, a second group of M signal paths each of which is substantially out-of-phase relative to the pair of signal paths, and at least a pair of feedback paths. Each of the P and M signal paths, as well as the feedback paths includes a delay element and a variable attenuator. Optionally, each of the M signal paths is optionally 180° out-of-phase relative to the pair of signal paths.Type: GrantFiled: February 4, 2014Date of Patent: November 8, 2016Assignee: Kumu Networks, Inc.Inventors: Jung-il Choi, Steven Hong, Mayank Jain, Sachin Katti, Philip Levis, Jeff Mehlman
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Publication number: 20160266245Abstract: Techniques for estimating one or more backscatter signals reflected from one or more objects are disclosed. In one example, a backscatter sensor includes, in part, a receiver for receiving a composite signal comprising one or more reflections of a transmitted signal, each reflection being reflected by one of a plurality of objects; and a processor configured to estimate at least a first backscatter component of the composite signal using a progressive interference cancellation technique. The first backscatter component of the composite signal corresponds to a reflection of the transmitted signal from a first object. In one embodiment, the backscatter sensor includes multiple receivers and/or one or more transmitters.Type: ApplicationFiled: November 14, 2014Publication date: September 15, 2016Inventors: Dinesh BHARADIA, Kiran JOSHI, Sachin KATTI
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Publication number: 20160234005Abstract: A system for processing signals includes an interference cancellation component that samples an RF transmit signal, transforms the sampled RF transmit signal into a self-interference cancellation signal, and combines the sampled RF transmit signal and self-interference cancellation signal to remove a first portion of interference from the RF receive signal, the combination forming a processed RF signal; and a filtering component that removes a second portion of interference from the processed signal by downconverting the processed RF signal to a processed baseband signal, sampling the processed baseband signal to create a processed digital signal, and filtering the processed digital signal to remove the second portion of interference.Type: ApplicationFiled: April 19, 2016Publication date: August 11, 2016Inventors: Steven HONG, Sachin KATTI, Jeff MEHLMAN
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Publication number: 20160226653Abstract: 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: ApplicationFiled: September 29, 2014Publication date: August 4, 2016Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Dinesh BHARADIA, Sachin KATTI
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Patent number: 9331737Abstract: A wireless communication device includes, in part, at least one antenna for receiving or transmitting a signal, and a cancelation circuit adapted to cancel or reduce the self-interference signal. The cancelation circuit includes, in part, a control block, N delay and attenuation paths, a combiner, and a subtractor. Each path includes a delay element and a variable attenuator whose attenuation level varies in response to a control signal generated by the control block. Each path receives a sample of the transmit signal and generates a delayed and attenuated (weighted) version of the sample signal. The combiner combines the N delayed and weighted versions of the sample signal to construct a signal representative of the self-interference signal. The subtractor subtracts the constructed signal from the received signal thereby the cancel or reduce the self-interference signal therefrom.Type: GrantFiled: June 7, 2013Date of Patent: May 3, 2016Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Steven Hong, Jeff Mehlman, Dinesh Bharadia, Sachin Katti
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Patent number: 9325432Abstract: The current subject matter relates to a system and a method for processing signals. The system can include a transmitting antenna for transmitting a signal over a plurality of wireless spectrum fragments, a receiving antenna for receiving a signal from the plurality of wireless spectrum fragments, and a signal processing layer in communication with the transmitting and receiving antennas for simultaneously causing reception of the received signal and transmission of the transmitted signal. The signal processing layer can include an interference cancellation component for removing a first portion of interference from the received signal and a filtering component for removing a second portion of the interference from the received signal.Type: GrantFiled: February 7, 2013Date of Patent: April 26, 2016Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Steven Hong, Sachin Katti, Jeff Mehlman