Patents by Inventor Ratnam Varada Raja Kumar

Ratnam Varada Raja Kumar 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).

  • Optimal training sequence and channel estimation method and system for superimposed training based OFDM systems
    Patent number: 8457258
    Abstract: The present invention relates to a method for minimizing means square estimation error (MSEE) and bit error rate during channel estimation and equalization between a transmitter and a receiver of an orthogonal frequency division multiplexing (OFDM) systems. The method comprises transmitting from said transmitter to said receiver a training sequence for channel estimation being superimposed onto data at specific pilot to data power ratio (PDPR), receiving the OFDM signals along with the training sequence as an input, cross-correlating said received signal to a specific lag determined by the rms delay spread of the channel, with a specific known training sequence stored in a register, and which is also the sequence that is added to the data at the transmitter in the time domain having a prescribed pilot to data power ratio.
    Type: Grant
    Filed: September 3, 2008
    Date of Patent: June 4, 2013
    Assignee: Indian Institute of Technology
    Inventors: Ratnam Varada Raja Kumar, Jinesh Parameshwaran Nair
  • OPTIMAL TRAINING SEQUENCE AND CHANNEL ESTIMATION METHOD AND SYSTEM FOR SUPERIMPOSED TRAINING BASED OFDM SYSTEMS
    Publication number: 20110007829
    Abstract: The present invention relates to a method for minimizing means square estimation error (MSEE) and bit error rate during channel estimation and equalization between a transmitter and a receiver of an orthogonal frequency division multiplexing (OFDM) systems. The method comprises transmitting from said transmitter to said receiver a training sequence for channel estimation being superimposed onto data at specific pilot to data power ratio (PDPR), receiving the OFDM signals along with the training sequence as an input, cross-correlating said received signal to a specific lag determined by the rms delay spread of the channel, with a specific known training sequence stored in a register, and which is also the sequence that is added to the data at the transmitter in the time domain having a prescribed pilot to data power ratio.
    Type: Application
    Filed: September 3, 2008
    Publication date: January 13, 2011
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY
    Inventors: Ratnam Varada Raja Kumar, Jinesh Parameshwaran Nair