Patents by Inventor Cheran Malsri Vithanage

Cheran Malsri Vithanage 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).

  • Wireless communications apparatus
    Patent number: 8442590
    Abstract: Determining a beamforming vector for a multi-antenna transmitter commences by determining an eigen-beamformer vector from the channel matrix and, for a number of iterations commencing with the eigen-beamformer vector, rotating the vector into a reference direction in vector space such that application of the rotated vector would result in peak radiation being directed in said reference direction, sampling a radiation pattern associated with the rotated eigen-beamformer vector with respect to transmission direction, compressing resultant samples to reduce spatial directivity induced by the vector, developing a rotated candidate beamformer on the basis of said compressed samples and returning said rotated candidate beamformer to the orientation of said vector before said rotating and storing said resultant vector as a candidate vector. Then, the candidate vectors are compared for the iterations and one is selected for use which best meets one or more selection criteria.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: May 14, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yue Wang, Cheran Malsri Vithanage
  • Signal decoding methods and apparatus
    Patent number: 7620877
    Abstract: This invention generally relates to methods, apparatus and computer program code for decoding signals, and more particularly to trellis-based decoding using a variant of a BCJR procedure.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: November 17, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Cheran Malsri Vithanage, Christophe Andrieu, Robert Jan Piechocki, Mong Suan Yee
  • WIRELESS COMMUNICATIONS APPARATUS
    Publication number: 20090233557
    Abstract: Determining a beamforming vector for a multi-antenna transmitter commences by determining an eigen-beamformer vector from the channel matrix and, for a number of iterations commencing with the eigen-beamformer vector, rotating the vector into a reference direction in vector space such that application of the rotated vector would result in peak radiation being directed in said reference direction, sampling a radiation pattern associated with the rotated eigen-beamformer vector with respect to transmission direction, compressing resultant samples to reduce spatial directivity induced by the vector, developing a rotated candidate beamformer on the basis of said compressed samples and returning said rotated candidate beamformer to the orientation of said vector before said rotating and storing said resultant vector as a candidate vector. Then, the candidate vectors are compared for the iterations and one is selected for use which best meets one or more selection criteria.
    Type: Application
    Filed: January 13, 2009
    Publication date: September 17, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yue Wang, Cheran Malsri Vithanage