Patents by Inventor John W. Pajunen

John W. Pajunen 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).

  • Patent number: 8274921
    Abstract: A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/?2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal.
    Type: Grant
    Filed: April 1, 2008
    Date of Patent: September 25, 2012
    Assignee: Harris Corporation
    Inventors: Christopher D. Moffatt, Anders Mattsson, John W. Pajunen
  • Patent number: 8229009
    Abstract: A communications device includes at least one memory device for storing complex exponential functions as approximations of sine and cosine basis waveforms. A logic circuit adds and subtracts the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data. The logic circuit provides efficient and accurate implementation of the IFFT for use as an OFDM modulator using additions of stored complex exponentials and modulation of the integer-valued QAM data symbols using logic shifts and sign changes (2's complement).
    Type: Grant
    Filed: April 1, 2008
    Date of Patent: July 24, 2012
    Assignee: Harris Corporation
    Inventors: Christopher D. Moffatt, Anders Mattsson, John W. Pajunen
  • Publication number: 20090245084
    Abstract: A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/?2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal.
    Type: Application
    Filed: April 1, 2008
    Publication date: October 1, 2009
    Applicant: HARRIS CORPORATION
    Inventors: Christopher D. Moffatt, Anders Mattsson, John W. Pajunen
  • Publication number: 20090245406
    Abstract: A communications device includes at least one memory device for storing complex exponential functions as approximations of sine and cosine basis waveforms. A logic circuit adds and subtracts the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data. The logic circuit provides efficient and accurate implementation of the IFFT for use as an OFDM modulator using additions of stored complex exponentials and modulation of the integer-valued QAM data symbols using logic shifts and sign changes (2's complement).
    Type: Application
    Filed: April 1, 2008
    Publication date: October 1, 2009
    Applicant: Harris Corporation, Corporation of the State of Delaware
    Inventors: Christopher D. Moffatt, Andrew Mattsson, John W. Pajunen