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: 8098781
    Abstract: A communications system receives a modulated signal that carries encoded communications data. An adaptive filter has a plurality of non-adaptive and adaptive filter taps with weighted coefficients and a input and output normalizing circuit that obtain sample values from a received signal input to or output from the adaptive filter to increase gain recovery based on type of modulation of encoded communication data, on state of demodulator (preamble search, preamble detected, data state) or other signal acquisition information. A demodulator and decoder receive the filtered output signal and demodulate and decode the signal to obtain the communications data.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: January 17, 2012
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Fred C. Kellerman, Brian C. Padalino
  • Patent number: 8094763
    Abstract: A communications system receives a modulated signal that carries encoded communications data. An adaptive filter has a plurality of non-adaptive and adaptive filter taps with weighted coefficients and an adaptive gain circuit for updating the adaptive gain of the adaptive filter responsive to a received state of a modem or the type of modulation used by communications system. 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: Grant
    Filed: October 12, 2007
    Date of Patent: January 10, 2012
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Fred C. Kellerman, Brian C. Padalino
  • Publication number: 20110310880
    Abstract: A wireless communications device may include a transceiver, a memory configured to store a predetermined set of preamble synchronization portions, each preamble synchronization portion having a different length, and a controller cooperating with the transceiver and the memory. The controller may be configured to receive forward transmission blocks, each forward transmission block having a preamble synchronization portion and a body portion associated therewith. The preamble synchronization portion may include a desired preamble synchronization portion from among the predetermined set of preamble synchronization portions. The controller may be configured to determine and use, for each received forward transmission block, the corresponding preamble synchronization portion from among the predetermined set of preamble synchronization portions.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 22, 2011
    Applicant: Harris Corporation, Corporaton of the State of Delaware
    Inventors: John W. Nieto, William N. Furman
  • Patent number: 8081722
    Abstract: A communications device includes a signal input for receiving both wideband and in-band, narrowband communication signals having wideband communications data that is transmitted over a wideband communications channel and narrowband communications data that is transmitted within an in-band, narrowband channels over the same wideband communications channel. A circuit splits the communications signals into a wideband signal channel and narrowband signal channels. A narrowband filter within the wideband signal channel filters the wideband communications signal and removes any narrowband communications signals. A demodulator within the wideband signal channel demodulates the filtered wideband communications signal to obtain any wideband communications data. An in-band, narrowband demodulators are positioned within the narrowband signal channels and demodulate the narrowband communications signals to obtain any narrowband communications data.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: December 20, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Brian C. Padalino
  • Patent number: 8077813
    Abstract: A decoding device may include a sequential convolutional code decoder, and a parallel convolutional code decoder. The decoding device may further include a controller for selectively processing a convolutionally encoded input signal via at least one of the sequential convolutional code decoder and the parallel convolutional code decoder. The selection of decoder may be based upon a signal-to-noise ratio or the passage of time, for example.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: December 13, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto
  • Patent number: 8059767
    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: Grant
    Filed: December 12, 2007
    Date of Patent: November 15, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, William L. Tyler
  • Patent number: 8059693
    Abstract: A radio device includes a transmitter having a modulator for generating M-PAM communications symbols containing communications data. A Fast Walsh Transform circuit orthogonally encodes and band-spreads the communications symbols using the Fast Walsh Transform. A frequency modulation circuit frequency modulates the communications symbols wherein a constant radius orthogonal Walsh modulated communications signal containing the communications data is generated.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: November 15, 2011
    Assignee: Harris Corporation
    Inventors: John W. Nieto, William N. Furman
  • Patent number: 8059766
    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: Grant
    Filed: December 12, 2007
    Date of Patent: November 15, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, William L. Tyler
  • Patent number: 8054920
    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: Grant
    Filed: December 12, 2007
    Date of Patent: November 8, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, William L. Tyler
  • Patent number: 8050359
    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: Grant
    Filed: April 12, 2007
    Date of Patent: November 1, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto
  • Patent number: 7903756
    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: Grant
    Filed: October 22, 2007
    Date of Patent: March 8, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto
  • Patent number: 7865808
    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: Grant
    Filed: May 9, 2007
    Date of Patent: January 4, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto
  • Patent number: 7864835
    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: Grant
    Filed: October 12, 2007
    Date of Patent: January 4, 2011
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Fred C. Kellerman, Brian C. Padalino
  • Patent number: 7860200
    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: Grant
    Filed: October 12, 2007
    Date of Patent: December 28, 2010
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, Fred C. Kellerman, Brian C. Padalino
  • Publication number: 20100150282
    Abstract: A decoding device may include a sequential convolutional code decoder, and a parallel convolutional code decoder. The decoding device may further include a controller for selectively processing a convolutionally encoded input signal via at least one of the sequential convolutional code decoder and the parallel convolutional code decoder. The selection of decoder may be based upon a signal-to-noise ratio or the passage of time, for example.
    Type: Application
    Filed: February 22, 2010
    Publication date: June 17, 2010
    Applicant: HARRIS CORPORATION a Delaware corporation
    Inventors: William N. Furman, John W. Nieto
  • Patent number: 7693239
    Abstract: A decoding device may include a sequential convolutional code decoder, and a parallel convolutional code decoder. The decoding device may further include a controller for selectively processing a convolutionally encoded input signal via at least one of the sequential convolutional code decoder and the parallel convolutional code decoder. The selection of decoder may be based upon a signal-to-noise ratio or the passage of time, for example.
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: April 6, 2010
    Assignee: Harris Corporation
    Inventors: William N. Furman, John W. Nieto
  • Publication number: 20100067634
    Abstract: The communications device includes a phase and frequency tracking loop having a signal input and an adjustable loop filter that establishes a predetermined tracking loop bandwidth for samples of communication signals received at the signal input and processed within the tracking loop. A tracking loop update circuit updates loop filter operating parameters and is operative with the loop filter for increasing or decreasing the tracking loop bandwidth of the phase and frequency tracking loop based on the dynamics of the frequency offset of measured samples from the output of the loop filter over time.
    Type: Application
    Filed: September 17, 2008
    Publication date: March 18, 2010
    Applicant: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, William L. Tyler
  • Publication number: 20100067619
    Abstract: A communications device includes a phase and frequency tracking loop having a signal input and adjustable loop filter that establishes a predetermined tracking loop bandwidth for samples of communication signals received at the signal input and processed within the tracking loop. A tracking loop update circuit updates the loop filter operating parameters. It is operative with the loop filter for increasing or decreasing the tracking loop bandwidth of the phase and frequency tracking loop based on the measured signal-to-noise ratio in the received samples of communication signals at the signal output by the tracking loop and on the known or measured apriori tracking capabilities of demodulator based on the symbol rate of communication signal.
    Type: Application
    Filed: September 17, 2008
    Publication date: March 18, 2010
    Applicant: Harris Corporation
    Inventors: William N. Furman, John W. Nieto, William L. Tyler
  • Publication number: 20100014559
    Abstract: A radio device includes a transmitter having a modulator for generating M-PAM communications symbols containing communications data. A Fast Walsh Transform circuit orthogonally encodes and band-spreads a communications symbol using the Fast Walsh Transform. A frequency modulation circuit frequency modulates the communications symbols wherein a constant envelope orthogonal Walsh modulated communications signal is generated having a plurality of orthogonal waveforms each forming a separate Walsh communications channel.
    Type: Application
    Filed: July 18, 2008
    Publication date: January 21, 2010
    Applicant: Harris Corporation
    Inventors: John W. Nieto, William N. Furman
  • Publication number: 20100014558
    Abstract: A radio device includes a transmitter having a modulator for generating M-PAM communications symbols containing communications data. A Fast Walsh Transform circuit orthogonally encodes and band-spreads the communications symbols using the Fast Walsh Transform. A frequency modulation circuit frequency modulates the communications symbols wherein a constant radius orthogonal Walsh modulated communications signal containing the communications data is generated.
    Type: Application
    Filed: July 18, 2008
    Publication date: January 21, 2010
    Applicant: HARRIS CORPORATION
    Inventors: John W. NIETO, William N. FURMAN