Patents Examined by Lawrence B. Williams
  • Patent number: 8433023
    Abstract: A computer system with a phase detector that generates a phase dependent control signal according to the phase relationship between a first and second clock signal. The phase detector includes first and second phase detector circuits receiving the first and second clock signals and generating select signals having duty cycles corresponding to the phase relationship between the clock edges of the first and second clock signals. The phase detector also includes a charge pump that receives select signals from the phase detector circuits and produces an increasing or decreasing control signal when the first and second clock signals do not have the predetermined phase relationship, and a non-varying control signal when the first and second clock signals do have the predetermined phase relationship. The delay value of a voltage-controlled delay circuit and the phase relationship between the first and second clock signals to a predetermined phase relationship are thereby adjusted.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: April 30, 2013
    Assignee: Round Rock Research, LLC
    Inventor: Ronnie M. Harrison
  • Patent number: 8432977
    Abstract: There is provided an information processing apparatus including an encoding unit that represents input data containing mutually different first and second bit values by a plurality of first amplitude values for the first bit value and a second amplitude value that is different from the first amplitude values for the second bit value, does not take an identical value consecutively, and perform encoding so that polarity of the amplitude value is reversed for each cycle, and a transmission unit that transmits a signal encoded by the encoding unit through a predetermined transmission line.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: April 30, 2013
    Assignee: Sony Corporation
    Inventor: Kunio Fukuda
  • Patent number: 8358723
    Abstract: A method, radio receiver, and system to autonomously receive and decode a plurality of signals having a variety of signal types without a priori knowledge of the defining characteristics of the signals is disclosed. The radio receiver is capable of receiving a signal of an unknown signal type and, by estimating one or more defining characteristics of the signal, determine the type of signal. The estimated defining characteristic(s) is/are utilized to enable the receiver to determine other defining characteristics. This in turn, enables the receiver, through multiple iterations, to make a maximum-likelihood (ML) estimate for each of the defining characteristics. After the type of signal is determined by its defining characteristics, the receiver selects an appropriate decoder from a plurality of decoders to decode the signal.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: January 22, 2013
    Assignee: The United States of America as Represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Jon Hamkins, Marvin K. Simon, Dariush Divsalar, Samuel J. Dolinar, Andre Tkacenko
  • Patent number: 8355427
    Abstract: A system and method that demodulates the phase characteristic of a carrier signal are described. The scrambling of the phase characteristic of each carrier signal includes associating a value with each carrier signal and computing a phase shift for each carrier signal based on the value associated with that carrier signal. The value is determined independently of any input bit value carried by that carrier signal. The phase shift computed for each carrier signal is combined with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristic of the carrier signals. Bits of an input signal are modulated onto the carrier signals having the substantially scrambled phase characteristic to produce a transmission signal with a reduced PAR.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: January 15, 2013
    Assignee: TQ Delta, LLC
    Inventor: Marcos C. Tzannes
  • Patent number: 8331483
    Abstract: A method for transmitting feedback information via a Spatial Rank Index (SRI) channel includes determining, at an access terminal, a value of a spatial rank index and transmitting, from the access terminal through the SRI channel, feedback information indicating the determined value of the spatial rank index according to a prescribed coding. The codeword of the prescribed coding is one of: (0,0,0,0,0,0,0,0), (1,0,1,0,1,1,0,1), (0,1,1,1,0,0,1,1), or (1,1,0,1,1,1,1,0).
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: December 11, 2012
    Assignee: LG Electronics Inc.
    Inventors: Dong Wook Roh, Sang Kim
  • Patent number: 8325849
    Abstract: A method of processing broadcast data in a broadcast transmitting system includes Reed-Solomon (RS) encoding and cyclic redundancy check (CRC) encoding enhanced data bytes; converting the RS-CRC encoded enhanced data bytes into enhanced data bits; encoding each of the converted enhanced data bits with one of a first coding rate and a second coding rate, thereby outputting data symbols; first interleaving the data symbols; converting the first interleaved data symbols into data bytes; forming a first data group including enhanced data corresponding to the converted data bytes; deinterleaving data of the first data group; outputting enhanced data packets including the deinterleaved data of the first data group; multiplexing the enhanced data packets with main data packets including main data; second interleaving data of the multiplexed data packets; and trellis encoding the second interleaved data.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: December 4, 2012
    Assignee: LG Electronics Inc.
    Inventors: Jong Moon Kim, In Hwan Choi, Byoung Gill Kim, Won Gyu Song, Jin Woo Kim, Hyoung Gon Lee
  • Patent number: 8315334
    Abstract: A digital television (DTV) transmitting system is provided that includes an encoder, a group formatter, a packet formatter and a transmission unit. The group formatter forms data groups where the plurality of second known data sequences are spaced 16 segments apart within at least one of the data groups that includes a transmission parameter inserted between the first known data sequence and the plurality of second known data sequences and the first known data sequence has a first M-symbol sequence and a second M-symbol sequence, the first M-symbol sequence and the second M-symbol sequence have a first pattern, each of the plurality of second known data sequences has a second pattern other than the first pattern, and the second pattern is positioned from a last symbol to a previous N symbol in each of the plurality of second known data sequences.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: November 20, 2012
    Assignee: LG Electronics Inc.
    Inventors: Byoung Gill Kim, In Hwan Choi, Jin Woo Kim, Jong Moon Kim, Won Gyu Song, Hyoung Gon Lee, Kook Yeon Kwak
  • Patent number: 8311144
    Abstract: Methods and systems are provided for searching for a codeword from a plurality of codewords in a codebook for use in precoding, for example, as used in a multiple-input multiple-output (MIMO) transmission system. Tree search and recursive algorithm techniques may be utilized to reduce the complexity and enhance the efficiency of the codebook search. Distance values may be determined between an optimal codeword and codewords in a codebook. The distance values may be accumulated for a group of the k-best codewords. Additionally or alternatively, a codeword from the codebook may be removed from consideration if the codeword meets a stop rule condition. A codeword may be selected from the codebook based on a minimum distance value from the optimal codeword.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: November 13, 2012
    Assignee: Marvell International Ltd.
    Inventors: Yakun Sun, Jungwon Lee
  • Patent number: 8300732
    Abstract: Apparatus and methods for removing dc offsets in feedback loops such as may be used in communication circuits are disclosed. A comparator may be used to sample the output of the feedback loop, with the comparator output applied to a DSP module. The DSP module is configured to determine a dc offset in the output signal and generate an offset correction signal, which may then be applied to the input of the feedback loop to adjust the de offset.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: October 30, 2012
    Assignee: Quintic Holdings
    Inventors: Mark Magdaleno, John B. Groe
  • Patent number: 8290086
    Abstract: Techniques for producing an output signal using an outphasing transmitter are disclosed. In some examples, constant modulation (CM) signals may be produced from a digital input signal. The CM signals may be converted to an analog state and filtered. The signals may then be modulated to produce modulated signals, which may be amplified. The amplified signals may be combined to produce combined signals, which may further be combined to produce an output signal.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: October 16, 2012
    Inventors: Tamal Bose, Xuetao Chen, Jeffery H. Reed
  • Patent number: 8284866
    Abstract: A MIMO-OFDM transmission and reception apparatus is provided which allows high accuracy estimation of frequency offset, high accuracy estimation of a transmission path fluctuation and high accuracy synchronization/signal detection. A mapping section generates a plurality of OFDM signals. In these OFDM signals, some pilot carriers are assigned to the same carrier position and orthogonal sequences are assigned to the same time slot in the same carrier position.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: October 9, 2012
    Assignee: Panasonic Corporation
    Inventors: Yutaka Murakami, Kiyotaka Kobayashi, Masayuki Orihashi
  • Patent number: 8284818
    Abstract: A code phase signalling module arranged to provide code phase signalling to assist in signal acquisition of direct sequence spread spectrum signalling received by a receiver module from a transmitter module. The code phase signalling is arranged to be used by the receiver module to synchronise the phase of a synchronisation code provided from within the receiver module with the phase of a modulation code of the direct spread spectrum sequence signalling received by the receiver module. The synchronisation code sequence corresponds to the modulation code sequence. The code phase signaling module is arranged to provide code phase time signaling representing the offset time of the synchronisation code from a reference time. The reference time is associated with the time of transmission of a particular reference portion of the modulation code of the direct spread spectrum signaling.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: October 9, 2012
    Assignee: Nokia Corporation
    Inventor: Kimmo Alanen
  • Patent number: 8279963
    Abstract: A system includes an encoding module, a symbol selection module, a subcarrier selection module, and a mapping module. The encoding module receives symbols for transmission over K subcarriers and T antennas, encodes the symbols using a space time code, and generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1. The symbol selection module selects T adjacent ones of the symbols and selects STC versions of the T adjacent ones of the symbols. The subcarrier selection module selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols. The mapping module maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: October 2, 2012
    Assignee: Marvell World Trade Ltd.
    Inventors: Jungwon Lee, Bhaskar V. Nallapureddy, Hui-Ling Lou
  • Patent number: 8279913
    Abstract: A system is disclosed for operating a plurality of receiver paths and/or a plurality of transmitter paths in a single mode or multiple mode configuration.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: October 2, 2012
    Assignee: Intel Mobile Communications GmbH
    Inventors: Stefan van Waasen, Martin Simon
  • Patent number: 8279911
    Abstract: A multipath detector includes an RF module receiving multiple signals, and a correlator module receiving the signals from the RF module. The correlator module correlates the signals to create a composite ACF, and produces samples of the composite autocorrelation function (ACF). The samples are time delayed relative to each other. The multipath detector also includes a carrier phase processor that receives the samples and estimates carrier phases associated with each of the samples. The carrier phase processor employs the estimated carrier phases to determine if one of the signals is subject to a multipath delay.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: October 2, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Dominic Gerard Farmer, Jie Wu, Emilija M. Simic
  • Patent number: 8275085
    Abstract: An apparatus for recovering data and a method thereof are provided. The apparatus includes a reference clock generator which generates a reference clock, and a data recovering unit which detects an edge of received data and recovers the data using a time difference between a reference point of the reference clock and the detected edge.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: September 25, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ju-hwan Yi
  • Patent number: 8275067
    Abstract: Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: September 25, 2012
    Assignee: Ikanos Communications, Inc.
    Inventors: Rahul Garg, Patrick Duvaut, Harish Jethanandani, Amitkumar Mahadevan
  • Patent number: 8270533
    Abstract: A transmitter for transmitting data in a communication system includes: a serial/parallel (S/P) conversion unit configured to convert data into an I signal and a Q signal; multiplication units configured to multiply the converted I and Q signals by orthogonal sequences, respectively; conversion units configured to Hilbert-transform the I and Q signals multiplied by the orthogonal sequences; addition units configured to add the I and Q signals multiplied by the orthogonal sequences and the Hilbert-transformed Q and I signal, respectively; and an intermediate frequency (IF)/radio frequency (RF) unit configured to up-convert the added I signal and the added Q signal and transmit the converted I and Q signals.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: September 18, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Ik Park, Hyoungsoo Lim, Heung-Mook Kim, Donghoon Kang, Wangrok Oh
  • Patent number: 8265220
    Abstract: The present invention includes a time-division-multiple-access (TDMA) communication system having a base station and at least one mobile station, each transmitting and receiving an analog radio-frequency signal carrying digitally coded speech. The speech is encoded using a vocoder which samples a voice signal at variable encoding rates. During periods when the radio-frequency channel is experiencing high levels of channel interference, the encoded voice channel having a lower encoding rate is chosen. This low-rate encoded voice is combined with the high degree of channel coding necessary to ensure reliable transmission. When the radio-frequency channel is experiencing low levels of channel interference, less channel coding is necessary and the vocoder having a higher encoding rate is used. The high-rate encoded voice is combined with the lower degree of channel coding necessary to ensure reliable transmission.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: September 11, 2012
    Assignee: LG Electronics Inc.
    Inventors: Jaleh Komaili, Yongbing Wan
  • Patent number: 8265207
    Abstract: Methods and apparatus are provided for computing reliability values in a pipeline. A reliability value portion is computed, with control circuitry in a first pipeline stage, based on a difference between a received input signal value and an expected value. The reliability value portion is combined, in a second pipeline stage that follows the first pipeline stage, with a first value derived from the received input signal to generate a first reliability value. A determination is made as to whether to update the first reliability value in a third pipeline stage based on a combination of the first reliability value with a second reliability value that corresponds to a second value derived from the received input signal.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: September 11, 2012
    Assignee: Marvell International Ltd.
    Inventors: Konstantinos Sarrigeorgidis, Yanni Chen, Leilei Song, Kedar Shirali