Patents by Inventor Balasubramaniam Natarajan

Balasubramaniam Natarajan 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).

  • Multiple-access code generation
    Patent number: 7587660
    Abstract: Multiple-access codes are generated using an asymptotically optimal decoding algorithm, such as the Viterbi algorithm. A trellis may be constructed using a number of desired users, at least one code length, and a number of code-chip parameters. A fitness function is derived from a mathematical relationship between the multiple-access codes, and may include some measure of correlation of the codes. The multiple-access codes correspond to paths having optimal path metrics derived from the fitness function. Multiple iterations through the trellis may be performed to refine a selection of multiple-access codes.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: September 8, 2009
    Assignee: Kansas State University Research Foundation
    Inventors: Justin S. Dyer, Balasubramaniam Natarajan
  • Cooperative-MIMO Communications
    Publication number: 20090135944
    Abstract: Spatial subchannel codes for wireless devices operating in a cooperative antenna array are generated using an asymptotically optimal decoding algorithm, such as a trellis-exploration algorithm similar to the Viterbi algorithm. A trellis may be constructed using a number of desired subchannels, at least one code length, and a number of code-chip parameters. A fitness function is derived from a mathematical relationship between codes, and may include some measure of correlation of the codes. The selected codes correspond to paths having optimal path metrics derived from the fitness function. Multiple iterations through the trellis may be performed to refine a selection of the codes.
    Type: Application
    Filed: January 27, 2009
    Publication date: May 28, 2009
    Inventors: Justin S. Dyer, Balasubramaniam Natarajan
  • Pre-coding for multiple-input-multiple-output communications
    Publication number: 20080095259
    Abstract: Precoding codes for MIMO transmitters are generated using an asymptotically optimal decoding algorithm, such as a trellis-exploration algorithm similar to the Viterbi algorithm. A trellis may be constructed using a number of desired subchannels, at least one code length, and a number of code-chip parameters. A fitness function is derived from a mathematical relationship between codes, and may include some measure of correlation of the codes. The selected codes correspond to paths having optimal path metrics derived from the fitness function. Multiple iterations through the trellis may be performed to refine a selection of the codes.
    Type: Application
    Filed: October 23, 2006
    Publication date: April 24, 2008
    Inventors: Justin S. Dyer, Balasubramaniam Natarajan
  • Multiple-access code generation
    Publication number: 20060239371
    Abstract: Multiple-access codes are generated using an asymptotically optimal decoding algorithm, such as the Viterbi algorithm. A trellis may be constructed using a number of desired users, at least one code length, and a number of code-chip parameters. A fitness function is derived from a mathematical relationship between the multiple-access codes, and may include some measure of correlation of the codes. The multiple-access codes correspond to paths having optimal path metrics derived from the fitness function. Multiple iterations through the trellis may be performed to refine a selection of multiple-access codes.
    Type: Application
    Filed: April 22, 2005
    Publication date: October 26, 2006
    Inventors: Justin Dyer, Balasubramaniam Natarajan