Patents by Inventor Mandayam Krishnan

Mandayam Krishnan 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).

  • Methods and apparatuses for determining loop characteristics using an extended voice-band modem
    Patent number: 7406157
    Abstract: Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of downstream multi-carrier tones of a digital subscriber line activation process are received at an extended voice-band modem and are capable of transmitting upstream multi-carrier tones of the digital subscriber line activation process over a local loop. The downstream carrier tones and the upstream carrier tones are folded into a first multi-tone signal and a second multi-tone signal, respectively, each having a plurality of component signals within the spectrum band of the extended voice-based modem. The total signal power of the first multi-tone signal is divided by the power of one of the plurality of component signals of the second multi-tone signal to determine a ratio value. The ratio value is used to determine a characteristic of the local loop.
    Type: Grant
    Filed: September 3, 2003
    Date of Patent: July 29, 2008
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Prashant Pratap Tawade, Vedavalli G. Krishnan, Wesley H. Smith, Mandayam Krishnan
  • Methods and apparatuses for determining loop characteristics using an extended voice-band modem
    Publication number: 20050047443
    Abstract: Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of downstream multi-carrier tones of a digital subscriber line activation process are received at an extended voice-band modem and are capable of transmitting upstream multi-carrier tones of the digital subscriber line activation process over a local loop. The downstream carrier tones and the upstream carrier tones are folded into a first multi-tone signal and a second multi-tone signal, respectively, each having a plurality of component signals within the spectrum band of the extended voice-based modem. The total signal power of the first multi-tone signal is divided by the power of one of the plurality of component signals of the second multi-tone signal to determine a ratio value. The ratio value is used to determine a characteristic of the local loop.
    Type: Application
    Filed: September 3, 2003
    Publication date: March 3, 2005
    Inventors: Sigang Qiu, Prashant Tawade, Vedavalli Krishnan, Wesley Smith, Mandayam Krishnan