Patents by Inventor Tien M. Nguyen

Tien M. Nguyen 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: 10102001
    Abstract: Supplemental instruction dispatch may be used in some instances in a parallel slice processor to dispatch additional instructions, referred to as supplemental instructions, to supplemental instruction ports of execution slices and using primary instruction ports of one or more execution slices to supply one or more source operands for such supplemental instructions. In addition, in some instances, in lieu of or in addition to supplemental instruction dispatch, selective slice partitioning may be used to selectively partition groups of execution slices in a parallel slice processor based upon a threading mode within which such execution slices are executing.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: October 16, 2018
    Assignee: International Business Machines Corporation
    Inventors: Kurt A. Feiste, Christopher M. Mueller, Dung Q. Nguyen, Eula A. Tolentino, Tien T. Tran, Jing Zhang
  • Publication number: 20180191457
    Abstract: A systematic interferences mitigation design for protected satellite communications (SATCOM) is provided. An advanced channel coding is designed to provide coding gain for SATCOM even in the presence of synchronization errors due to the effect of radio frequency interferences (RFIs). A unified SATCOM system spectrum efficiency and energy efficiency method is developed with a unified interference model for SATCOM dynamic resource allocation (DRA). The SATCOM system DRA is designed with a game theoretic engine and optimizations providing traffic control, power control, and modulation and coding agile waveform adaptations. The interferences mitigation design is implemented with software defined radio USRP and GNU-radio to maintain communication link quality of services (QoS).
    Type: Application
    Filed: January 3, 2017
    Publication date: July 5, 2018
    Inventors: GANG WANG, XIN TIAN, ZHIHUI SHU, WENHAO XIONG, TIEN M. NGUYEN, KHANH D. PHAM, ERIK BLASCH, DAN SHEN, ZHONGHAI WANG, GENSHE CHEN
  • Patent number: 8687679
    Abstract: An apparatus interfaces a commercial-off-the-shelf (COTS)/off-the-shelf (OTS) modem for pulsed data communication using existing sensor aperture among radar platforms. The apparatus includes a demodulator for receiving a sequence of first pulse signals, at least one first pulse signal of the sequence of first pulse signals being modulated with an input signal. The demodulator includes a pulse regeneration module for regenerating a pulse timing of the sequence of first pulse signals and a pulse demodulation module for demodulating the sequence of first pulse signals to recover the input signal in synchronization with the pulse timing of the sequence of first pulse signals.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: April 1, 2014
    Assignee: Raytheon Company
    Inventors: Tien M. Nguyen, James C. Thi
  • Patent number: 8362945
    Abstract: Systems and methods for detecting and tracking a gun using millimeter waves are provided. In one embodiment, the invention relates to a method for detecting and tracking a gun using radio frequency waves at millimeter wavelengths, the method including storing empirical data, for up to N types of guns, including information indicative of a resonant frequency of a barrel of each of the N guns, generating pulse energy including at least one sequence of pulses at millimeter wave frequencies for each of the N guns, transmitting the pulse energy, receiving reflected pulse energy, filtering the reflected pulse energy to a preselected bandwidth for each of the N guns, determining a first maximum value of the filtered reflected pulse energy in each of the preselected bandwidths that exceeds a preselected threshold, determining a second maximum value among the first maximum values, and correlating a frequency of the second maximum value with the stored resonant frequencies of the N guns to identify a gun.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: January 29, 2013
    Assignee: Raytheon Company
    Inventors: Tien M. Nguyen, John J. Wootan
  • Publication number: 20120256779
    Abstract: Systems and methods for detecting and tracking a gun using millimeter waves are provided. In one embodiment, the invention relates to a method for detecting and tracking a gun using radio frequency waves at millimeter wavelengths, the method including storing empirical data, for up to N types of guns, including information indicative of a resonant frequency of a barrel of each of the N guns, generating pulse energy including at least one sequence of pulses at millimeter wave frequencies for each of the N guns, transmitting the pulse energy, receiving reflected pulse energy, filtering the reflected pulse energy to a preselected bandwidth for each of the N guns, determining a first maximum value of the filtered reflected pulse energy in each of the preselected bandwidths that exceeds a preselected threshold, determining a second maximum value among the first maximum values, and correlating a frequency of the second maximum value with the stored resonant frequencies of the N guns to identify a gun.
    Type: Application
    Filed: October 4, 2010
    Publication date: October 11, 2012
    Inventors: Tien M. Nguyen, John J. Wootan
  • Publication number: 20120114026
    Abstract: An apparatus interfaces a commercial-off-the-shelf (COTS)/off-the-shelf (OTS) modem for pulsed data communication using existing sensor aperture among radar platforms. The apparatus includes a demodulator for receiving a sequence of first pulse signals, at least one first pulse signal of the sequence of first pulse signals being modulated with an input signal. The demodulator includes a pulse regeneration module for regenerating a pulse timing of the sequence of first pulse signals and a pulse demodulation module for demodulating the sequence of first pulse signals to recover the input signal in synchronization with the pulse timing of the sequence of first pulse signals.
    Type: Application
    Filed: November 5, 2010
    Publication date: May 10, 2012
    Inventors: Tien M. Nguyen, James C. Thi
  • Patent number: 7469026
    Abstract: A timing recovery loop includes a random walk filter counter for counting early, nominal and late arrivals of data transitions pulses of an input baseband signal waveform encoding a digital bit stream, and provides magnitude counts that are compared to a threshold value that when exceeded by the magnitude counts results in a delay adjustment of the generated adjusted timing pulses then remaining synchronized with the actual bit timing for maintaining bit timing lock. The adjusted timing pulses can then be used by a data detector for reliable data detection and reconstruction of the digital bit stream. The threshold value can be adaptively adjusted for reducing drop lock rates in the presence of changing channel environments.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: December 23, 2008
    Assignee: The Aerospace Corporation
    Inventors: Tien M. Nguyen, James Yoh, Ashok Mathur, Gary W. Goo
  • Publication number: 20080114783
    Abstract: The present invention features multiple ideas that enable building and maintaining process scorecard models for a large number of process variations; process reference scorecard models and process/IT scorecard delta models. Specifically, the present invention provides a solution for managing a process and IT interlock. Under this solution a tabular model of a process having process steps along a first axis and process variations along a second axis, with cells at the intersections of the axes is constructed. Process step details including IT details for a base process are populated into the cells of a first row of the second axis. Delta details (to-be base cases) of the process steps for each of the process variations are populated into additional rows of the second axis. Project management status indicators are enabled for each cell to denote statuses of the process steps in each cell.
    Type: Application
    Filed: November 15, 2006
    Publication date: May 15, 2008
    Inventors: Tien M. Nguyen, Jay K. Strosnider
  • Patent number: 7145972
    Abstract: A polyphase channelizer converts an intermediate frequency wideband signal into a complex signal that is sampled by parallel analog-to-digital converters having a bank of samplers respectively clocked by staggered clocking signals for respective converters for feeding I and Q quadrature samples to a polyphase filter bank of finite impulse response filters driving a fast Fourier transform processor for providing channelized digital signal outputs. The parallel analog-to-digital converters can operate at lower speeds but are parallel connected for effectively operating at required higher speeds. The channelizer channelizes the wideband signal using a polyphase clock for enabling high speed sampling and converting through low speed parallel analog to digital converters.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: December 5, 2006
    Assignee: The Aerospace Corporation
    Inventors: Rajendra Kumar, Tien M. Nguyen
  • Patent number: 7120198
    Abstract: A coherent adaptive subcarrier modulation system applies subcarrier modulation to quadrature modulated signals with constant envelope modulation suitable for efficient sinewave and squarewave subcarrier modulations. The quadrature subcarrier enables the addition of new signals to the in-phase and quadrature phase signals with spectral isolation in the Global Position System while maintaining a constant envelop amplitude.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: October 10, 2006
    Assignee: The Aerospace Corporation
    Inventors: Philip A. Dafesh, Tien M. Nguyen
  • Patent number: 6804493
    Abstract: A command and telemetry communication system includes a downlink subsystem having a spacecraft downlink transmitter communicating a quadrature component carrying a pilot code for coarse acquisition and an inphase component carrying a Walsh-Hadamard code and a PN code for fine acquisition using spread spectrum signaling and amplitude modulation for code division multiplexing to downlink receivers respectively disposed in a plurality of mobile surface landers, and includes an uplink subsystem having a spacecraft uplink receiver and lander uplink transmitters communicating code division multiple access telemetry data using spread spectrum signaling and phase modulation. The communication system enables command and telemetry control of a plurality of mobile surface landers.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: October 12, 2004
    Assignee: The Aerospace Corporation
    Inventors: Tien M. Nguyen, Jack K. Holmes
  • Patent number: 6680648
    Abstract: An adaptive predistorter system receives and predistorts an input signal so as to linearize the output signal of a nonlinear high power amplifier amplifying the predistorted input signal using closed-loop feedback of the output signal in complex form at baseband so as to adaptively change the amount of the predistortion of the input signal in the presence of high power amplifier changing characteristics.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: January 20, 2004
    Assignee: The Aerospace Corporation
    Inventors: Tien M. Nguyen, James Yoh, Charles C. Wang, Diana M. Johnson
  • Publication number: 20030190889
    Abstract: A command and telemetry communication system includes a downlink subsystem having a spacecraft downlink transmitter communicating a quadrature component carrying a pilot code for coarse acquisition and an inphase component carrying a Walsh-Hadamard code and a PN code for fine acquisition using spread spectrum signaling and amplitude modulation for code division multiplexing to downlink receivers respectively disposed in a plurality of mobile surface landers, and includes an uplink subsystem having a spacecraft uplink receiver and lander uplink transmitters communicating code division multiple access telemetry data using spread spectrum signaling and phase modulation. The communication system enables command and telemetry control of a plurality of mobile surface landers.
    Type: Application
    Filed: April 3, 2002
    Publication date: October 9, 2003
    Applicant: The Aerospace Corporation
    Inventors: Tien M. Nguyen, Jack K. Holmes
  • Publication number: 20030169834
    Abstract: A timing recovery loop includes a random walk filter counter for counting early, nominal and late arrivals of data transitions pulses of an input baseband signal waveform encoding a digital bit stream, and provides magnitude counts that are compared to a threshold value that when exceeded by the magnitude counts results in a delay adjustment of the generated adjusted timing pulses then remaining synchronized with the actual bit timing for maintaining bit timing lock. The adjusted timing pulses can then be used by a data detector for reliable data detection and reconstruction of the digital bit stream. The threshold value can be adaptively adjusted for reducing drop lock rates in the presence of changing channel environments.
    Type: Application
    Filed: March 7, 2002
    Publication date: September 11, 2003
    Applicant: The Aerospace Corporation
    Inventors: Tien M. Nguyen, James Yoh, Ashok Mathur, Gary W. Goo
  • Publication number: 20030169108
    Abstract: An adaptive predistorter system receives and predistorts an input signal so as to linearize the output signal of a nonlinear high power amplifier amplifying the predistorted input signal using closed-loop feedback of the output signal in complex form at baseband so as to adaptively change the amount of the predistortion of the input signal in the presence of high power amplifier changing characteristics.
    Type: Application
    Filed: March 8, 2002
    Publication date: September 11, 2003
    Applicant: The Aerospace Corporation
    Inventors: Tien M. Nguyen, James Yoh, Charles C. Wang, Diana M. Johnson
  • Publication number: 20030076899
    Abstract: A polyphase channelizer converts an intermediate frequency wideband signal into a complex signal that is sampled by parallel analog-to-digital converters having a bank of samplers respectively clocked by staggered clocking signals for respective converters for feeding I and Q quadrature samples to a polyphase filter bank of finite impulse response filters driving a fast Fourier transform processor for providing channelized digital signal outputs. The parallel analog-to-digital converters can operate at lower speeds but are parallel connected for effectively operating at required higher speeds. The channelizer channelizes the wideband signal using a polyphase clock for enabling high speed sampling and converting through low speed parallel analog to digital converters.
    Type: Application
    Filed: October 18, 2001
    Publication date: April 24, 2003
    Applicant: The Aerospace Corporation
    Inventors: Rajendra Kumar, Tien M. Nguyen
  • Patent number: 6429740
    Abstract: A predistortion method uses an extended Saleh model for linearizing the output of nonlinear high power amplifiers having inherent amplitude modulation to amplitude modulation distortion, and inherent amplitude modulation to phase modulation distortion, during conversions of an input signal to an output signal. A complex baseband linearizer provides predistortion at baseband for reducing spectral regrowth and improves bit error performance. The predistortion effects are matched to the amplifier distortions to cancel out the distortions to provide linearized conversions. The extended Saleh model provides a general solution using selected coefficients matched to distortion effects of a particular amplifier.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: August 6, 2002
    Assignee: The Aerospace Corporation
    Inventors: Tien M. Nguyen, James Yoh, Andrew S. Parker, Diana M. Johnson
  • Patent number: 6411661
    Abstract: A GMSK timing recovery loop in a receiver of a Gaussian Minimum Shift Keying (GMSK) link with a low channel Bit Signal-to-Noise Ratio (BSNR) and a small bandwidth-bit period BT product in a high bandwidth efficiency channel, includes a hard limiter for converting at baseband a GMSK demodulated received signal into a hard clocking signal clocking a conventional digital tracking transition loop generating the bit timing signal in closed loop control for stable time tracking performance for coherent demodulation of GMSK signals. The hard limiter provides the hard clocking signal at baseband having transitions at multiple bit periods adjusted by the bit timing error signal from the digital tracking transition loop for providing reduced jitter of the bit timing signal for accurate timing recovery and detection of communicated data.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: June 25, 2002
    Assignee: The Aerospace Corporation
    Inventors: Tien M. Nguyen, Jack K. Holmes, Srini H. Raghavan
  • Patent number: 6307435
    Abstract: A predistortion method use a modified linear-log model for linearizing the output of nonlinear high power amplifiers having inherent amplitude modulation to amplitude modulation distortion, and inherent amplitude modulation to phase modulation distortion, during conversions of an input signal to an output signal. A complex baseband linearizer provides predistortion at baseband for reducing spectral regrowth and improves bit error performance. The predistortion effects are matched to the amplifier distortions to cancel out the distortions to provide linearized conversions. The modified linear-log model is used to reduce the clipping effects through the peak operating point for a specified output power loss with minimum distortion.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: October 23, 2001
    Assignee: The Aerospace Corporation
    Inventors: Tien M. Nguyen, James Yoh, Andrew S. Parker, Diana M. Johnson
  • Patent number: RE41797
    Abstract: A polyphase channelizer converts an intermediate frequency wideband signal into a complex signal that is sampled by parallel analog-to-digital converters having a bank of samplers respectively clocked by staggered clocking signals for respective converters for feeding I and Q quadrature samples to a polyphase filter bank of finite impulse response filters driving a fast Fourier transform processor for providing channelized digital signal outputs. The parallel analog-to-digital converters can operate at lower speeds but are parallel connected for effectively operating at required higher speeds. The channelizer channelizes the wideband signal using a polyphase clock for enabling high speed sampling and converting through low speed parallel analog to digital converters.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: October 5, 2010
    Assignee: The Aerospace Corporation
    Inventors: Rajendra Kumar, Tien M. Nguyen