Patents by Inventor Gregory S. Mitchell

Gregory S. Mitchell 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).

  • Quadrature vestigial sideband digital communications method and system with correlated noise removal
    Patent number: 7200193
    Abstract: A quadrature vestigial-sideband (QVSB) method and system with correlated noise removal are embodied in a QVSB receiver with a correlated-noise estimator-subtractor configured to obtain I/Q channel correlated noise estimates for receive-filtered I/Q signals in the QVSB receiver, and to subtract the I/Q channel correlated noise estimates from the receive-filtered I/Q signals to whiten noises entering a quadrature-crosstalk, maximum-likelihood-sequence-estimator (QC-MLSE) of the QVSB receiver.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: April 3, 2007
    Assignee: The Aerospace Corporation
    Inventors: John J. Poklemba, Gregory S. Mitchell, Ronald F. Smith
  • Quadrature vestigial sideband digital communications method
    Patent number: 6606010
    Abstract: A quadrature vestigial sideband (QVSB) communication system provide bandwidth efficient data transmission using cross coupled data signaling during both transmit and receive having controlled intersymbol interference. The QVSB modem includes cross coupled arm transmit and receive data filtering on both of the I&Q channels providing a bandwidth efficient QVSB spectra. A quadrature crosstalk maximum likelihood sequence estimator implements a Viterbi decoding algorithm for providing estimated data sequence outputs. The receiver is a coherently aided demodulator synchronized by a synchronization loop providing time and phase references using the estimated data sequence outputs.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: August 12, 2003
    Assignee: The Aerospace Corporation
    Inventors: John J. Poklemba, Gregory S. Mitchell
  • QUADRATURE VESTIGIAL SIDEBAND DIGITAL COMMUNICATIONS METHOD
    Publication number: 20030141938
    Abstract: A quadrature vestigial sideband (QVSB) communication system provide bandwidth efficient data transmission using cross coupled data signaling during both transmit and receive having controlled intersymbol interference. The QVSB modem includes cross coupled arm transmit and receive data filtering on both of the I&Q channels providing a bandwidth efficient QVSB spectra. A quadrature crosstalk maximum likelihood sequence estimator implements a Viterbi decoding algorithm for providing estimated data sequence outputs. The receiver is a coherently aided demodulator synchronized by a synchronization loop providing time and phase references using the estimated data sequence outputs.
    Type: Application
    Filed: January 30, 2002
    Publication date: July 31, 2003
    Applicant: The Aerospace Corporation
    Inventors: John J. Poklemba, Gregory S. Mitchell
  • Quadrature vestigial sideband digital communications method and system with correlated noise removal
    Publication number: 20030142765
    Abstract: A quadrature vestigial-sideband (QVSB) method and system with correlated noise removal are embodied in a QVSB receiver with a correlated-noise estimator-subtractor configured to obtain I/Q channel correlated noise estimates for receive-filtered I/Q signals in the QVSB receiver, and to subtract the I/Q channel correlated noise estimates from the receive-filtered I/Q signals to whiten noises entering a quadrature-crosstalk, maximum-likelihood-sequence-estimator (QC-MLSE) of the QVSB receiver.
    Type: Application
    Filed: October 23, 2002
    Publication date: July 31, 2003
    Inventors: John J. Poklemba, Gregory S. Mitchell, Ronald F. Smith