Patents by Inventor Krishna Kant Chintalapudi

Krishna Kant Chintalapudi 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: 9918242
    Abstract: A dynamic channel selection approach for wireless communication networks is provided by measuring an ineffective communication metric on a currently-used channel. The network can switch channels if the ineffective communication metric from a device on the network satisfies a channel selection condition. To change the wireless communication network to the new channel, all network devices in the wireless communication network are instructed to switch to the new channel. As network communications start on the new channel, the ineffective communication metric measurements begin again on the new channel. Communications on the new channel continue until the channel selection condition is satisfied on the new channel, at which point another random selection of a channel is executed. The process continues in such iterations during the operation of the network and its network devices.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: March 13, 2018
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Bozidar Radunovic, Ramachandran Ramjee, Krishna Kant Chintalapudi, Deeparnab Chakrabarty, Apurv Bhartia
  • Patent number: 9883383
    Abstract: The security of Near Field Communications (NFC) against eavesdroppers is improved by encoding a hidden key, private to an initiating device, onto the carrier wave when a target device communicates its data via the carrier. The initiating device, in possession of the hidden key, is enabled to undo the scrambling effects of the hidden key to thereby privately interpret the data encoded onto the carrier wave by the target device. In various aspects, the hidden key is a one-time-use key that is randomly generated, used, and then discarded, preventing malicious parties from gaining the hidden key to later interpret intercepted data signals.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: January 30, 2018
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Krishna Kant Chintalapudi, Nissanka Arachchige Bodhi Priyantha
  • Publication number: 20170374618
    Abstract: A “Skip-Correlator” ensures carrier sensing symmetry between wireless devices of arbitrary transmission power levels, thereby enabling fair sharing of available spectrum of a wireless channel between the wireless devices. In various implementations, receivers of a wireless device receive wireless preambles from neighboring wireless transmitters. This preamble includes an indication of a transmission power level of the neighboring wireless transmitter. The wireless device then selects and correlates a subset of samples of the received preamble as a function of a transmission power level of that wireless device. The remaining samples of the preamble are skipped by the receiving wireless device, hence the use of the term “Skip-Correlator.” Further, the wireless device computes a total preamble energy of the correlated samples of the received preamble.
    Type: Application
    Filed: June 24, 2016
    Publication date: December 28, 2017
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Ramachandran Ramjee, Krishna Kant Chintalapudi, Romil Bhardwaj
  • Patent number: 9686760
    Abstract: A multiple independent narrow-channel wireless network and method for transmitting and received data over a wireless network using a fragmented frequency spectrum. The system and method uses a plurality of narrow wireless channels obtained from splitting a wide wireless channel. Each narrow channel performs sending, receiving, and carrier sensing. Moreover, each narrow channel is independent such that data can be sent or received without any interference from other narrow channels and without synchronization. Embodiments of the system and method include a compound radio having a compound receiver and a compound transmitter. The compound transmitter includes an inter-radiolet symbol synchronization module, to permit use of a single inverse fast Fourier transform block, and a dynamically configurable filter array, to mitigate leakage between channels. The compound receiver uses fraction data rate processing to optimize efficiency.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: June 20, 2017
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Krishna Kant Chintalapudi, Bozidar Radunovic, Horia Vlad Balan, Michael Buettner, Vishnu Navda, Ramachandran Ramjee
  • Publication number: 20170055179
    Abstract: A dynamic channel selection approach for wireless communication networks is provided by measuring an ineffective communication metric on a currently-used channel. The network can switch channels if the ineffective communication metric from a device on the network satisfies a channel selection condition. To change the wireless communication network to the new channel, all network devices in the wireless communication network are instructed to switch to the new channel. As network communications start on the new channel, the ineffective communication metric measurements begin again on the new channel. Communications on the new channel continue until the channel selection condition is satisfied on the new channel, at which point another random selection of a channel is executed. The process continues in such iterations during the operation of the network and its network devices.
    Type: Application
    Filed: August 21, 2015
    Publication date: February 23, 2017
    Inventors: Bozidar Radunovic, Ramachandran Ramjee, Krishna Kant Chintalapudi, Deeparnab Chakrabarty, Apurv Bhartia
  • Patent number: 9113485
    Abstract: A wireless data transmission method includes providing a plurality of radio frequency transmitters. A receiver is provided to receive transmissions from the transmitters. A data format including a plurality of transmission time slots is defined. Each of the transmitters is caused to independently select one of the time slots. The transmitters are used to transmit the transmissions to the receiver in the independently selected time slots.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: August 18, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Krishna Kant Chintalapudi, Lakshmi Venkatraman
  • Publication number: 20140348155
    Abstract: A multiple independent narrow-channel wireless network and method for transmitting and received data over a wireless network using a fragmented frequency spectrum. The system and method uses a plurality of narrow wireless channels obtained from splitting a wide wireless channel. Each narrow channel performs sending, receiving, and carrier sensing. Moreover, each narrow channel is independent such that data can be sent or received without any interference from other narrow channels and without synchronization. Embodiments of the system and method include a compound radio having a compound receiver and a compound transmitter. The compound transmitter includes an inter-radiolet symbol synchronization module, to permit use of a single inverse fast Fourier transform block, and a dynamically configurable filter array, to mitigate leakage between channels. The compound receiver uses fraction data rate processing to optimize efficiency.
    Type: Application
    Filed: August 8, 2014
    Publication date: November 27, 2014
    Applicant: MICROSOFT CORPORATION
    Inventors: Krishna Kant CHINTALAPUDI, Bozidar RADUNOVIC, Horia Vlad BALAN, Michael BUETTNER, Vishnu NAVDA, Ramachandran RAMJEE
  • Patent number: 8837612
    Abstract: A multiple independent narrow-channel wireless network and method for transmitting and received data over a wireless network using a fragmented frequency spectrum. The system and method uses a plurality of narrow wireless channels obtained from splitting a wide wireless channel. Each narrow channel performs sending, receiving, and carrier sensing. Moreover, each narrow channel is independent such that data can be sent or received without any interference from other narrow channels and without synchronization. Embodiments of the system and method include a compound radio having a compound receiver and a compound transmitter. The compound transmitter includes an inter-radiolet symbol synchronization module, to permit use of a single inverse fast Fourier transform block, and a dynamically configurable filter array, to mitigate leakage between channels. The compound receiver uses fraction data rate processing to optimize efficiency.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: September 16, 2014
    Assignee: Microsoft Corporation
    Inventors: Krishna Kant Chintalapudi, Bo{hacek over (z)}idar Radunović, Horia Vlad Balan, Michael Buettner, Vishnu Navda, Ramachandran Ramjee
  • Patent number: 8798089
    Abstract: The claimed subject matter provides a method for wireless communications. The method includes transmitting, by a first node in a wireless network, a first preamble. The method also includes detecting, in parallel with transmitting the first preamble, a transmission of a second preamble. A second node in the wireless network transmits the second preamble. Additionally, the method includes determining a later start between the transmission of the first preamble and the transmission of the second preamble. The method further includes terminating transmission of the first preamble the determining indicates that the transmission of the first preamble started after the transmission of the second preamble.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: August 5, 2014
    Assignee: Microsoft Corporation
    Inventors: Krishna Kant Chintalapudi, Bo{hacek over (z)}idar Radunović, Ramachandran Ramjee, Eugenio Magistretti
  • Publication number: 20120320887
    Abstract: The claimed subject matter provides a method for wireless communications. The method includes transmitting, by a first node in a wireless network, a first preamble. The method also includes detecting, in parallel with transmitting the first preamble, a transmission of a second preamble. A second node in the wireless network transmits the second preamble. Additionally, the method includes determining a later start between the transmission of the first preamble and the transmission of the second preamble. The method further includes terminating transmission of the first preamble the determining indicates that the transmission of the first preamble started after the transmission of the second preamble.
    Type: Application
    Filed: June 17, 2011
    Publication date: December 20, 2012
    Applicant: Microsoft Corporation
    Inventors: Krishna Kant Chintalapudi, Bozidar Radunovic, Ramachandran Ramjee, Eugenio Magistretti
  • Publication number: 20120321009
    Abstract: A multiple independent narrow-channel wireless network and method for transmitting and received data over a wireless network using a fragmented frequency spectrum. The system and method uses a plurality of narrow wireless channels obtained from splitting a wide wireless channel. Each narrow channel performs sending, receiving, and carrier sensing. Moreover, each narrow channel is independent such that data can be sent or received without any interference from other narrow channels and without synchronization. Embodiments of the system and method include a compound radio having a compound receiver and a compound transmitter. The compound transmitter includes an inter-radiolet symbol synchronization module, to permit use of a single inverse fast Fourier transform block, and a dynamically configurable filter array, to mitigate leakage between channels. The compound receiver uses fraction data rate processing to optimize efficiency.
    Type: Application
    Filed: June 17, 2011
    Publication date: December 20, 2012
    Applicant: Microsoft Corporation
    Inventors: Krishna Kant Chintalapudi, Bozidar Radunovic, Horia Vlad Balan, Michael Buettner, Vishnu Navda, Ramachandran Ramjee
  • Patent number: 8331344
    Abstract: A wireless data transmission method includes providing a plurality of radio frequency transmitters. A receiver is provided to receive transmissions from the transmitters. A data format including a plurality of transmission time slots is defined. A first subset of the plurality of transmitters that are apt to send the transmissions simultaneously is determined. Each of the transmitters in the first subset is assigned to a different one of the time slots. A second subset of the plurality of transmitters that are apt to send the transmissions non-simultaneously is determined. Each of the transmitters in the second subset is assigned to a same one of the time slots. The transmitters are used to transmit the transmissions to the receiver in accordance with the assigning steps.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: December 11, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Krishna Kant Chintalapudi, Lakshmi Venkatraman
  • Publication number: 20110304503
    Abstract: The simultaneous localization and RF modeling technique pertains to a method of providing simultaneous localization and radio frequency (RF) modeling. In one embodiment, the technique operates in a space with wireless local area network coverage (or other RF transmitters). Users carrying Wi-Fi-enabled devices traverse this space while the mobile devices record the Received Signal Strength (RSS) measurements corresponding to access points (APs) in view at various unknown locations and report these RSS measurements, as well as nay other available location fix to a localization server. A RF modeling algorithm runs on the server and is used to estimate the location of the APs using the recorded RSSI measurements and any other available location information. All of the observations are constrained by the physics of wireless propagation. The technique models these constraints and uses a genetic algorithm to solve them, thereby providing an absolute location of the mobile device.
    Type: Application
    Filed: June 15, 2010
    Publication date: December 15, 2011
    Applicant: MICROSOFT CORPORATION
    Inventors: Krishna Kant Chintalapudi, Venkata N. Padmanabhan, Anand Padmanabha Iyer
  • Patent number: 8077090
    Abstract: The simultaneous localization and RF modeling technique pertains to a method of providing simultaneous localization and radio frequency (RF) modeling. In one embodiment, the technique operates in a space with wireless local area network coverage (or other RF transmitters). Users carrying Wi-Fi-enabled devices traverse this space while the mobile devices record the Received Signal Strength (RSS) measurements corresponding to access points (APs) in view at various unknown locations and report these RSS measurements, as well as nay other available location fix to a localization server. A RF modeling algorithm runs on the server and is used to estimate the location of the APs using the recorded RSSI measurements and any other available location information. All of the observations are constrained by the physics of wireless propagation. The technique models these constraints and uses a genetic algorithm to solve them, thereby providing an absolute location of the mobile device.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 13, 2011
    Assignee: Microsoft Corp.
    Inventors: Krishna Kant Chintalapudi, Venkata N. Padmanabhan, Anand Padmanabha Iyer
  • Publication number: 20110051710
    Abstract: A wireless data transmission method includes providing a plurality of radio frequency transmitters. A receiver is provided to receive transmissions from the transmitters. A data format including a plurality of transmission time slots is defined. A first subset of the plurality of transmitters that are apt to send the transmissions simultaneously is determined. Each of the transmitters in the first subset is assigned to a different one of the time slots. A second subset of the plurality of transmitters that are apt to send the transmissions non-simultaneously is determined. Each of the transmitters in the second subset is assigned to a same one of the time slots. The transmitters are used to transmit the transmissions to the receiver in accordance with the assigning steps.
    Type: Application
    Filed: September 3, 2009
    Publication date: March 3, 2011
    Applicant: Robert Bosch GmbH
    Inventors: Krishna Kant Chintalapudi, Lakshmi Venkatraman
  • Publication number: 20090323716
    Abstract: A wireless data transmission method includes providing a plurality of radio frequency transmitters. A receiver is provided to receive transmissions from the transmitters. A data format including a plurality of transmission time slots is defined. Each of the transmitters is caused to independently select one of the time slots. The transmitters are used to transmit the transmissions to the receiver in the independently selected time slots.
    Type: Application
    Filed: April 22, 2009
    Publication date: December 31, 2009
    Inventors: Krishna Kant Chintalapudi, Lakshmi Venkatraman