Patents Represented by Attorney Wilson & Ham & Holman
  • Patent number: 8295380
    Abstract: An automatic gain control (AGC) circuit and method for performing AGC for an orthogonal frequency-division multiplexing (OFDM) receiver measures signal power of input digital signals that are derived from incoming data frames with preambles to produce gain change signals when the signal power differs from a reference target power level. The gain of an amplifier of the OFDM receiver is changed in response to the gain change signals until a preamble of the data frames is detected for the first time. The gain of the amplifier of the OFDM receiver is further changed in response to the gain change signals, after the preamble is detected, only during periods when the preambles of the data frames are being processed by the OFDM receiver such that the gain of the amplifier is not changed during periods when other portions of the data frames are being processed by the OFDM receiver.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: October 23, 2012
    Assignee: Amicus Wireless Technology Ltd
    Inventors: Mingrui Zhu, Gwang-Hyun Gho, Won-Joon Choi
  • Patent number: 8253596
    Abstract: A digraphic keypad includes a configuration of specific keys. These specific keys include an “S” key, an “O” key, a “U” key, an “A” key, an “N” key, an “I” key, a “T” key, an “E” key, an “R” key, an “H” key, a “D” key and an “L” key.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: August 28, 2012
    Inventor: Chan Young Park
  • Patent number: 8143903
    Abstract: A resonance scanning system and method for testing equipment for electromagnetic resonances uses a resonance detection subsystem with at least one probe to identify at least one of a resonating location, a resonating frequency and a quality factor of a resonance of the equipment and an automatic scanning subsystem to displace the probe to different testing locations of the equipment so that the resonance detection subsystem can determine if any of the different testing locations of the equipment exhibits electromagnetic resonances.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: March 27, 2012
    Assignee: The Curators of the University of Missouri
    Inventors: David J. Pommerenke, Wei Huang, Peng Shao, Jiang Xiao
  • Patent number: 8135078
    Abstract: A device and method for performing a channel profile estimation for an OFDM-based wireless communication system uses an averaged frequency coherence metric to select a particular channel profile, which is a current channel profile estimate. The averaged frequency coherence metric is derived using correlations between pilot subcarriers of an OFDM-based signal at predefined subcarrier locations for multiple frames of the OFDM-based signal. The selected channel profile may be used for channel estimation, as well as for link adaptation, to improve the performance of these processes.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: March 13, 2012
    Assignee: Amicus Wireless Technology Ltd.
    Inventors: Kee-Bong Song, Won-Joon Choi
  • Patent number: 8134911
    Abstract: An OFDM-based device and method for performing synchronization utilizes a time-domain preamble of an incoming OFDM-based signal to compute an estimated fine frequency offset. The computation of the estimated fine frequency offset involves multiplying values of the time-domain preamble with conjugates of corresponding values of a selected base station time-domain preamble, averaging the resulting multiplied values in predefined segments and self-correlating the resulting averaged values to derive a self-correlation value, which is used to compute the estimated fine frequency offset.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: March 13, 2012
    Assignee: Amicus Wireless Technology Ltd.
    Inventors: Jingnong Yang, Won-Joon Choi
  • Patent number: 8130848
    Abstract: A device and method for performing a channel estimation for an OFDM-based wireless communication system using sparsely spaced pilot subcarriers estimates missing pilot subcarriers in an interpolation window using pilot subcarriers that are outside of the interpolation window to produce estimated pilot subcarriers for the interpolation window. The pilot subcarriers in the interpolation window and the estimated pilot subcarrier are used to compute pilot channel estimates for the interpolation window, which are then used to derive data channel estimates for the interpolation window.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: March 6, 2012
    Assignee: Amicus Wireless Technology Ltd.
    Inventors: Kee-Bong Song, Won-Joon Choi
  • Patent number: 8090869
    Abstract: Priority-biased compound arbitration at a switching fabric ingress. The ingress includes a plurality of ingress queues and a priority-biased arbitration engine configured to arbitrate between the ingress queues. The ingress further includes exit first-in-first-out queues (FIFOs) configured to forward cells from the ingress queues to a switching fabric and a throughput-biased arbitration engine configured to arbitrate between the exit FIFOs.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: January 3, 2012
    Assignee: Alcatel Lucent
    Inventor: Greg Mathews
  • Patent number: 8050363
    Abstract: A Turbo decoder and method for decoding a double-binary circular recursive systematic convolutional (DBCRSC) encoded signal with unknown initial and final states executes iterations of forward and backward recursion on a payload block of the DBCRSC encoded signal and a padded block using an estimated forward state metric (FSM) and an estimated backward state metric (BSM), which are updated at one or more iterations.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: November 1, 2011
    Assignee: Amicos Wireless Technology Ltd.
    Inventors: Gwang-Hyun Gho, Won-Joon Choi
  • Patent number: 8050362
    Abstract: A soft-bit de-mapping device and method of generating soft bits for decoding quantizes a log-likelihood ratio (LLR) value for a received value using functions bits and channel parameter bits to generate the soft bits. The function bits are generated by quantizing an LLR function for the received value, which includes modifying an original curve of the LLR function to a modified curve such that a segment of the original curve with the lowest slope is protected in the modified curve for a fixed equal quantization step-size. The channel parameter bits are generated by quantizing a channel parameter for the received value to generate channel.
    Type: Grant
    Filed: May 24, 2008
    Date of Patent: November 1, 2011
    Assignee: Amicus Wireless Technology Ltd.
    Inventors: Gwang-Hyun Gho, Kee-Bong Song, Won-Joon Choi
  • Patent number: 8044339
    Abstract: An optical encoder and method for measuring displacement information using an optical encoder uses an encoder member with multiple digital diffractive optic regions to optically diffract an incident beam of light to produce output beams of light having intensity distribution patterns, which are used to generate electrical signals that provide relative displacement information of the encoder member.
    Type: Grant
    Filed: January 2, 2009
    Date of Patent: October 25, 2011
    Assignee: Arcus Technology, Inc.
    Inventors: Christopher C. Chang, Bernard C. Kress
  • Patent number: 8030876
    Abstract: A stepper motor device uses compensating non-sinusoidal driving values to compensate for operational non-sinusoidal drive characteristics of a motor of the device due to at least design and manufacturing imperfections in the motor. The compensating non-sinusoidal driving values may be derived using back electromagnetic force produced from the motor or using measured rotational positions of the motor when the motor is driven using known driving values.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: October 4, 2011
    Assignee: Arcus Technology, Inc.
    Inventors: Christopher C. Chang, Edward Li, Thomas Judge
  • Patent number: 7941558
    Abstract: Loop-elimination in a network is provided by establishing a physical topology based domain within the network and restricting protocol data units that are received within the physical topology based domain from being consumed at a network node outside of the physical topology based domain, wherein the protocol data units include loop-elimination information. The loop-elimination technique may also include identifying a logical based domain that exists within the network and then restricting protocol data units that are received within the physical topology based domain and the logical based domain from being consumed outside of the physical topology based domain and the logical based domain.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: May 10, 2011
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Shriram Srinivasan, Shantanu R. Kothavale
  • Patent number: 7930423
    Abstract: A method and system for distributing data packets within a network node is disclosed. The method and system for distributing data packets within a network node involves the utilization of a moving weighted average function to dynamically distribute the data packets in a balanced fashion. By utilizing a moving weighted average function to dynamically distribute the data packets in a balanced fashion, data packets are distributed more efficiently thereby increasing the overall efficiency of network operations. The method and system include computing a ratio matrix based on a moving weight average function of a load over a plurality of data ports and distributing data packets to the plurality of data ports based on the ratio matrix.
    Type: Grant
    Filed: February 11, 2003
    Date of Patent: April 19, 2011
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Diwakar Tundlam, Thirumalpathy Balakrishnan