Patents by Inventor C. Richard Johnson

C. Richard Johnson 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 system for equalizing data
    Patent number: 7305028
    Abstract: A method for equalizing data and systems utilizing the method. The method of this invention for equalizing (by shortening the channel response) data includes minimizing a function of the data and a number of equalizer characteristic parameters, where the function utilizes auto-correlation data corresponding to equalized data. Updated equalizer characteristic parameters are then obtained from the minimization and an initial set of equalizer characteristic parameters. Finally, the received data is processed utilizing the equalizer defined by the minimization. The method of this invention can be implemented in an equalizer and the equalizer of this invention may be included in a system for receiving data.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: December 4, 2007
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Jaiganesh Balakrishnan, Richard K. Martin, C. Richard Johnson, Jr.
  • Methods and system for equalizing data in multicarrier receiver systems
    Patent number: 7230984
    Abstract: A method for equalizing data and systems utilizing the method. The method of this invention for equalizing (by shortening the channel response) data includes minimizing a function of the data and a number of equalizer characteristic parameters, where the function utilizes cyclic differences of equalized data. Updated equalizer characteristic parameters are then obtained from the minimization and an initial set of equalizer characteristic parameters. Finally, the received data is processed utilizing the equalizer defined by the minimization. The method of this invention can be implemented in an equalizer and the equalizer of this invention may be included in a system for receiving data.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: June 12, 2007
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Richard K. Martin, Jaiganesh Balakrishnan, Wonzoo Chung, C. Richard Johnson, Jr., William A. Sethares
  • Method and apparatus for timing recovery based on dispersion characterization and components therefor
    Patent number: 7106818
    Abstract: The present invention provides a method for generating a timing offset signal applied to a sampling device for recovering a symbol stream from a broadcast signal by characterizing the dispersion of received signal. Preferably, the method includes steps for generating a derivative signal approximating the derivative of the symbol stream, producing a constant representative of an expected symbol stream, and multiplying the derivative signal, the constant, and a signal one of corresponding to and approximating the symbol stream to thereby generate the timing offset signal. A dispersion characterizing receiver and a digital signal processor employed therein are also described.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: September 12, 2006
    Assignee: Koninkijke Philips Electronics N.V.
    Inventors: Jaiganesh Balakrishnan, William A Sethares, Wonzoo Chung, Richard Martin, C. Richard Johnson, Jr.
  • Methods and system for equalizing data in multicarrier receiver systems
    Publication number: 20030210743
    Abstract: A method for equalizing data and systems utilizing the method. The method of this invention for equalizing (by shortening the channel response) data includes minimizing a function of the data and a number of equalizer characteristic parameters, where the function utilizes cyclic differences of equalized data. Updated equalizer characteristic parameters are then obtained from the minimization and an initial set of equalizer characteristic parameters. Finally, the received data is processed utilizing the equalizer defined by the minimization. The method of this invention can be implemented in an equalizer and the equalizer of this invention may be included in a system for receiving data.
    Type: Application
    Filed: March 17, 2003
    Publication date: November 13, 2003
    Applicant: Cornell Research Foundation, Inc.
    Inventors: Richard K. Martin, Jaiganesh Balakrishnan, Wonzoo Chung, C. Richard Johnson, William A. Sethares
  • Methods and system for equalizing data
    Publication number: 20030210742
    Abstract: A method for equalizing data and systems utilizing the method. The method of this invention for equalizing (by shortening the channel response) data includes minimizing a function of the data and a number of equalizer characteristic parameters, where the function utilizes auto-correlation data corresponding to equalized data. Updated equalizer characteristic parameters are then obtained from the minimization and an initial set of equalizer characteristic parameters. Finally, the received data is processed utilizing the equalizer defined by the minimization. The method of this invention can be implemented in an equalizer and the equalizer of this invention may be included in a system for receiving data.
    Type: Application
    Filed: March 17, 2003
    Publication date: November 13, 2003
    Applicant: Cornell Research Foundation, Inc.
    Inventors: Jaiganesh Balakrishnan, Richard K. Martin, C. Richard Johnson
  • Method and apparatus for timing recovery based on dispersion characterization and components therefor
    Publication number: 20020061082
    Abstract: The present invention provides a method for generating a timing offset signal applied to a sampling device for recovering a symbol stream from a broadcast signal by characterizing the dispersion of received signal. Preferably, the method includes steps for generating a derivative signal approximating the derivative of the symbol stream, producing a constant representative of an expected symbol stream, and multiplying the derivative signal, the constant, and a signal one of corresponding to and approximating the symbol stream to thereby generate the timing offset signal. A dispersion characterizing receiver and a digital signal processor employed therein are also described.
    Type: Application
    Filed: September 7, 2001
    Publication date: May 23, 2002
    Applicant: FOX DIGITAL
    Inventors: Jaiganesh Balakrishnan, William A. Sethares, Wonzoo Chung, Richard Martin, C. Richard Johnson