Patents by Inventor William N. Furman

William N. Furman 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: 7627803
    Abstract: A communications system includes a transmitter having an encoder for encoding communications data and varying at least one of a puncturing of the code rate and a repetition rate on different portions of the communications data. As a result, a variable forward error correction is added to different portions of the communications data.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: December 1, 2009
    Assignee: Harris Corporation
    Inventors: John W. Nieto, William N. Furman
  • Publication number: 20090207944
    Abstract: A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and processor that generates an initial frequency offset estimate and phase error estimate by processing such as with a Fast Fourier Transform (FFT), that detects the repeated preamble pattern for a block of samples within the communications signal, correlates two halves of the block of samples with a plurality of different shifted sequences and determines a maximum correlation value for the shifted sequence that provides the maximum correlation value to establish a symbol timing estimate based on the known timing alignment of this shifted sequence. Radio circuitry is operative with the modem for processing communications data obtained from the communications signal.
    Type: Application
    Filed: December 12, 2007
    Publication date: August 20, 2009
    Applicant: Harris Corporation
    Inventors: William N. FURMAN, John W. NIETO, William L. TYLER
  • Publication number: 20090154601
    Abstract: A repeated preamble bit or symbol pattern such as for a binary phase shift keyed (BPSK) communications signal is received within a modem. An initial frequency offset and phase error estimate is generated by processing a Fast Fourier Transform (FFT) that detects the repeated preamble pattern for a block of samples within the communications signal. Two halves of the block of samples are correlated with a plurality of different BPSK shifted sequences to obtain a symbol timing alignment based on the shifted sequence providing the maximum correlation value. A frequency offset estimate is iteratively updated an N number of times using the shifted sequence providing the maximum correlation value to refine an acquisition estimate of the frequency offset and phase error of the received communications signal.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Applicant: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, William L. Tyler
  • Publication number: 20090154602
    Abstract: A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and processor that generates an initial frequency offset estimate and phase error estimate by processing a Fast Fourier Transform (FFT) that detects the repeated preamble pattern for a block of samples within the communications signal, correlates within a start of message correlator to search for a start of message sequence and correlates different phases of the repeated preamble pattern within training correlators for reducing false detections of the start of message. Radio circuitry is operative with the modem for processing communications data obtained from the communications signal.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Applicant: Harris Corporation
    Inventors: William N. FURMAN, John W. NIETO, William L. TYLER
  • Publication number: 20090102687
    Abstract: A system communicates data and includes an encoder for encoding communications data. A modulator maps the communications data based on a specific mapping algorithm to form a communications signal over which the communications data can be transmitted. The communications signal includes a preamble that has set-up or transmission parameters used for acquiring the signal at a modem and at least one extended preamble for conveying additional set-up or transmission parameters. This extended preamble includes N extended preamble bits having at least one of information, transmission parameter and control bits and M map bits that identify a predetermined mapping for the N extended preamble bits.
    Type: Application
    Filed: October 22, 2007
    Publication date: April 23, 2009
    Applicant: Harris Corporation, Corporation of the State of Delaware
    Inventors: William N. Furman, John W. Nieto
  • Publication number: 20090098828
    Abstract: A communications system receives a modulated signal that carries encoded communications data. An adaptive filter has an input, a plurality of non-adaptive and adaptive filter taps with weighted coefficients, and an output. The received signal is passed through the adaptive filter and around adaptive filter and a switch selects which signal to pass to demodulator based on measured output power of the adaptive filter and of the original received signal. A demodulator and decoder receive the filtered output signal and demodulate and decode the signal to obtain the communications data.
    Type: Application
    Filed: October 12, 2007
    Publication date: April 16, 2009
    Applicant: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Fred C. Kellerman, Brian C. Padalino
  • Publication number: 20090097539
    Abstract: A communication system receives a modulated signal that carries encoded communication data. An adaptive filter has a plurality of adaptive filter taps and weighted coefficients and a variable delay circuit operative before the adaptive filter taps for separating the spacing of multipath introduced by adaptive filter and producing a filtered output signal with improved multipath performance. A demodulator and decoder receive the filtered output signal from the adaptive filter and demodulate and decode the signal to obtain the communications data.
    Type: Application
    Filed: October 12, 2007
    Publication date: April 16, 2009
    Applicant: Harris Corporation
    Inventors: William N. FURMAN, John W. NIETO, Fred C. KELLERMAN, Brian C. PADALINO
  • Patent number: 7512197
    Abstract: In accordance with the present invention, the system and method removes interfering signals from a communications signal and includes a Fast Fourier Transform (FFT) circuit for taking the FFT of a received signal and segmenting the signal into segments. A frequency shifting circuit can shift each segment in frequency to place an interfering signal within a single FFT band to be later substantially nulled. An inverse FFT circuit can place the segments of signals back within the time domain.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: March 31, 2009
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto
  • Patent number: 7508884
    Abstract: A system communicates data and includes an encoder for encoding communications data with a forward error correction code. A data randomizer randomizes the communications data with a random bit sequence and a combining circuit combines the communications data with known symbols into frames. A modulator maps the communications data into minimum shift keying or Gaussian minimum shift keying (MSK or GMSK) symbols based on a specific mapping algorithm to form a communications signal having an MSK or GMSK waveform over which the communications data can be transmitted.
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: March 24, 2009
    Assignee: Harris Corporation
    Inventors: John W. Nieto, William N. Furman, Michael A. Wadsworth
  • Publication number: 20080279109
    Abstract: A system apparatus and method generates a communications signal having an error detection mechanism. A circuit generates a data packet. An encoder multiplies and accumulates data words with values in a distance table containing non-repeated n-bit multipliers having “m” number of one bits that are set to obtain accumulated sum bits and appends the accumulated sum bits to the data packet as an error detection code to form a communications signal to be transmitted.
    Type: Application
    Filed: May 9, 2007
    Publication date: November 13, 2008
    Applicant: Harris Corporation, Corporation of the State of Delaware
    Inventors: William N. FURMAN, John W. Nieto
  • Publication number: 20080253480
    Abstract: Method for modulating an RF signal includes the steps of modulating an RF signal using frequency shift keying (FSK) modulation to define a plurality of symbols (2030, 2031). The FSK modulation includes transitioning the modulated signal (204) between at least two different frequencies (f1 and f0) during a guard period (210). The method includes the further step of varying a frequency of the modulated signal 204 during the guard period (210) in accordance with a predetermined rate of change. The predetermined rate of change is selected to minimize a bandwidth of the RF signal.
    Type: Application
    Filed: April 12, 2007
    Publication date: October 16, 2008
    Applicant: HARRIS CORPORATION
    Inventors: William N. Furman, John W. Nieto
  • Publication number: 20080198786
    Abstract: A communication system includes a plurality of nodes forming a wireless mesh network. A plurality of wireless communication links connect the nodes together. Each node is formed as a communications device having a physical layer and a media access control (MAC) layer in accordance with the Open System Interconnect (OSI) model and operative for transmitting and receiving communications packets to and from other nodes via the wireless communication links in an Automatic Repeat Request (ARQ) mode. The physical layer monitors channel parameters of the wireless communications link when in an ARQ mode and, based on the channel parameters, communicates to the MAC layer over-the-air (OTA) parameters used for transmitting packets.
    Type: Application
    Filed: February 20, 2007
    Publication date: August 21, 2008
    Applicant: Harris Corporation
    Inventors: John W. NIETO, William N Furman, Michael A Wadsworth
  • Patent number: 7352795
    Abstract: A communications system of the present invention includes a transmitter that is operative for combining an orthogonal Walsh modulation with a minimum shift keying or Gaussian minimum shift keying waveform to form a hybrid communications signal that carries communications data over a constant amplitude waveform that is spread in time and frequency. This communications signal can be transmitted to a RAKE receiver that has a plurality of correlators with output weights formed for processing this hybrid communications signal.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: April 1, 2008
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Michael A. Wadsworth
  • Publication number: 20080010582
    Abstract: A communications system includes a transmitter having an encoder for encoding communications data and varying at least one of a puncturing of the code rate and a repetition rate on different portions of the communications data. As a result, a variable forward error correction is added to different portions of the communications data.
    Type: Application
    Filed: July 5, 2006
    Publication date: January 10, 2008
    Applicant: Harris Corporation
    Inventors: John W. Nieto, William N. Furman
  • Patent number: 4872182
    Abstract: A frequency management scheme for a multistation H.F. communication network establishes communication channels among network stations over respective ones of K frequencies, so that network stations may communicate with one another. Any station desiring to communicate with another station, repeatedly transmits, on each of plural ones of the K communication frequencies in sequence, a probe message comprised of three successive symbols, each of which is defined in accordance with a prescribed pseudo random M-ary code, in the form of multi-chip sequence, that represents the address of the station to whom the communication is directed. The first symbol is effectively unmodulated to permit monitoring equipment of a receiving station of the network to settle out. The second symbol represents the address of the transmitting station. The third symbol identifies the number of times that the frequency which carries the probe message has been transmitted.
    Type: Grant
    Filed: March 8, 1988
    Date of Patent: October 3, 1989
    Assignee: Harris Corporation
    Inventors: Daniel D. McRae, William N. Furman