Patents by Inventor Wen Gao

Wen Gao 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).

  • METHOD AND DEVICE FOR ENCODING AND DECODING VIDEOS
    Publication number: 20120201303
    Abstract: The embodiments of the present invention provide a method and a device for encoding and decoding videos, and relate to the communication field, and an efficient transformation matrix corresponding to features of each residual block is selected for transformation, which therefore improves encoding efficiency. The solution provided in an embodiment of the present invention is: generating a prediction residual according to input video data; selecting a set of best transformation matrixes among multiple candidate transformation matrixes according to an intra-frame prediction mode and rate-distortion criteria to perform transform-coding on the prediction residual and obtain a transformation result; and generating an encoded stream according to the transformation result and selected transformation matrix index information.
    Type: Application
    Filed: April 20, 2012
    Publication date: August 9, 2012
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mingyuan YANG, Dong WANG, Lianhuan XIONG, Xin ZHAO, Li ZHANG, Siwei MA, Wen GAO
  • Decoding of raptor codes
    Patent number: 8239727
    Abstract: There are provided a method and apparatus for decoding Raptor code. The apparatus includes a decoder for decoding a sequence of packets representative of a sequence of encoding symbols. The decoder at least partially recovers at least some lost or corrupted packets of the sequence using Raptor code.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: August 7, 2012
    Assignee: Thomson Licensing
    Inventor: Wen Gao
  • Apparatus and method for detecting free ATSE channels
    Patent number: 8238830
    Abstract: A Wireless Regional Area Network (WRAN) receiver comprises a transceiver for communicating with a wireless network over one of a number of channels, and an Advanced Television Systems Committee (ATSC) signal detector for use in forming a supported channel list comprising those ones of the number of channels upon which an ATSC signal was not detected. The ATSC signal detector comprises a matched filter that matches to at least a modulated version of an ATSC field sync signal for detecting the presence of an incumbent ATSC broadcast signal.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: August 7, 2012
    Assignee: Thomson Licensing
    Inventors: Wen Gao, Hou-Shin Chen
  • BYPASS ROUTING TO A MOBILE DEVICE
    Publication number: 20120178460
    Abstract: A bypass server is placed in an outgoing link between a mobile device server and a relay used to distribute data from the mobile device server to remote mobile devices to which the data is addressed. Where a direct connection is established between a suitably configured network node (such as a personal computer) and a given mobile device, the bypass server may form a local connection with the network node and divert along the local connection those packets that are addressed to the given mobile device. As such, a lower cost/higher bandwidth local communication path between the given mobile device and the mobile device server may be established, when compared to the conventional remote communication path. The local communication path may be especially useful for bulk data transfers.
    Type: Application
    Filed: March 19, 2012
    Publication date: July 12, 2012
    Inventors: Allan David Lewis, George Dos Santos, Russel N. Owen, Wen Gao, Philip C. Luk, David A. Bajar, David P. Yach
  • SYSTEM AND METHOD FOR CONTROLLING CONFIGURATION SETTINGS FOR MOBILE COMMUNICATION DEVICES AND SERVICES
    Publication number: 20120136980
    Abstract: A wireless mobile communication device includes a processing system, a memory device and software. The software is stored on the memory device and executable by the processing system to receive a policy setting, authenticate a sender of the received policy, and automatically apply the policy setting on the communication device based on a successful authentication of the sender.
    Type: Application
    Filed: February 3, 2012
    Publication date: May 31, 2012
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: James A. Godfrey, Denny K. Chiu, Wen Gao
  • METHOD AND APPARATUS FOR ROBUST AND HIGH EFFICIENCY FEC FRAME HEADER RECOVERY
    Publication number: 20120128101
    Abstract: Methods and apparatus for FEC frame header detection are provided, suitable for use in a DVB-C2 receiver. A first method comprises demodulating with a quadrature phase shift keying (QPSK) demapper, followed by correlation and symmetry measures for detection of a robust FEC header. A second method comprises demodulating with a 16 quadrature amplitude modulation (QAM) demapper, followed by correlation and symmetry measures for detection of a high efficiency FEC leader. Another embodiment comprises using both the first and second methods to find the FEC header because the first symbol of the FEC frame header may be sent either in robust mode or in high efficiency mode. There is also provided a method and apparatus for generating an alternate decision statistic for determining detection of the FEC frame header.
    Type: Application
    Filed: June 28, 2010
    Publication date: May 24, 2012
    Applicant: THOMSON LICENSING LLC
    Inventors: Hou-Shin Chen, Wen Gao
  • Stopping criteria in iterative decoders
    Patent number: 8171367
    Abstract: Methods and apparatus for reducing power consumption in an iterative decoder. A memory stores a decoded codeword for a current iteration and an iteration terminator compares the decoded codeword for the current iteration to the codeword from prior iterations, and further terminates the iterations when a confidence value is achieved.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: May 1, 2012
    Assignee: Thomson Licensing
    Inventors: Wen Gao, Joshua Lawrence Koslov
  • Bypass routing to a mobile device
    Patent number: 8155645
    Abstract: A bypass server is placed in an outgoing link between a mobile device server and a relay used to distribute data from the mobile device server to remote mobile devices to which the data is addressed. Where a direct connection is established between a suitably configured network node (such as a personal computer) and a given mobile device, the bypass server may form a local connection with the network node and divert along the local connection those packets that are addressed to the given mobile device. As such, a lower cost/higher bandwidth local communication path between the given mobile device and the mobile device server may be established, when compared to the conventional remote communication path. The local communication path may be especially useful for bulk data transfers.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: April 10, 2012
    Assignee: Research In Motion Limited
    Inventors: Allan David Lewis, George Dos Santos, Russell N. Owen, Wen Gao, Philip C. Luk, David A. Bajar, David P. Yach
  • SYNC DETECTION AND FREQUENCY RECOVERY FOR SATELLITE SYSTEMS
    Publication number: 20120069942
    Abstract: A method of frame sync detection is described. A first and second differential correlation of a data stream is calculated, at a plurality of delay and conjugate multipliers. The first and second differential correlations are convolved with a previous set of differential correlations. A correlation peak is calculated, at a sync detector, using the convolved differential correlations, to detect a frame sync.
    Type: Application
    Filed: May 28, 2010
    Publication date: March 22, 2012
    Inventors: Paul Gothard Knutson, Dirk Schmitt, Wen Gao
  • METHOD AND APPARATUS FOR SPECTRUM SENSING OF FM WIRELESS MICROPHONE SIGNALS
    Publication number: 20120065911
    Abstract: Methods and apparatus for spectrum sensing for FM wireless microphone signals are provided. The spectrum sensing algorithm developed makes use of the property that the autocorrelation function of an FM signal is a sinusoidal function provided that the frequency) deviation is much smaller than the carrier frequency and the correlation delay is small. Based on this property, a simple spectrum sensing algorithm for the FM signal is designed by computing the autocorrelation function of the received signal and matched filtering of the sinusoidal function. The spectrum sensor provided by this approach can reliably detect the target signals when a strong adjacent channel interference exists and the signal power is as low as ?114 dBm.
    Type: Application
    Filed: May 18, 2010
    Publication date: March 15, 2012
    Inventors: Hou-Shin Chen, Wen Gao
  • System and method for controlling configuration settings for mobile communication devices and services
    Patent number: 8134954
    Abstract: A system for controlling configuration settings for mobile data communication devices and services includes a redirection server and a policy generation system. The redirection server detects a triggering event in a host system and in response to the triggering event continuously redirects data items from the host system to a wireless network. Each mobile data communication device receives data items from the wireless network and includes a device configuration stored in a memory location on the mobile data communication device. The device configuration of each mobile data communication device controls one or more functions of the mobile data communication device. The policy generation system receives a policy setting from a user interface and stores the policy setting in a user information record associated with a mobile data communication device.
    Type: Grant
    Filed: November 20, 2007
    Date of Patent: March 13, 2012
    Assignee: Research In Motion Limited
    Inventors: James A. Godfrey, Denny K. Chiu, Wen Gao
  • METHOD AND APPARATUS FOR SYMBOL TIMING RECOVERY
    Publication number: 20120057664
    Abstract: Methods and apparatus for symbol timing recovery are provided. Both a coarse symbol timing recovery method and apparatus, and a fine symbol timing recovery method and apparatus are described which can be used jointly for symbol recovery, for example in phase shift keying receivers. The coarse method involves the use of differential correlations and finding the time difference in peak values of the correlation results. The fine method involves interpolation of a received digital signal, followed by filtering and timing error detection. The error detection signal is further filtered and used to control the interpolator. The methods provide for robust symbol timing synchronization.
    Type: Application
    Filed: May 28, 2010
    Publication date: March 8, 2012
    Inventors: Paul Gothard Knutson, Dirk Schmitt, Wen Gao
  • Fast cycle slip detection and correction
    Publication number: 20120051478
    Abstract: A method of detecting and correcting cycle slip in a data stream including sync symbol blocks and data symbol blocks prior to feedback carrier recovery is described. A phase ambiguity angle is computed upon detecting a last sync symbol of a sync symbol block in the data stream. A cycle slip corrector initiates cycle slip correction upon determining the computed phase ambiguity angle is different from a previous computed phase ambiguity angle to generate a corrected data stream. The corrected data stream is provided to a feedback carrier recovery circuit.
    Type: Application
    Filed: May 28, 2010
    Publication date: March 1, 2012
    Inventors: Dirk Schmitt, Wen Gao, Paul Gothard Knutson
  • Heat dissipation fan
    Patent number: 8123475
    Abstract: A heat dissipation fan includes a fan frame, a bearing assembly, a stator and a rotor. The fan frame includes a base and a central tube. The central tube includes an open top end and an open bottom end. The base defines a receiving concave at a bottom surface thereof. The receiving concave communicates with the central hole. A top wall is formed by the base over the concave. A sidewall is formed between the top wall and the bottom surface of the base and surrounds the concave. A plurality of first locking units extend from the top wall into the receiving concave. The bearing assembly includes an oil sealing cover for sealing the open bottom end of the central tube. The oil sealing cover includes a plurality of second locking units which are detachably interlocked with the first locking units to mount the oil sealing cover to the base.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: February 28, 2012
    Assignees: Fu Zhun Precision Industry (Shen Zhen) Co., Ltd., Foxconn Technology Co., Ltd.
    Inventors: Zhi-Ya Yang, Wen-Gao Wang
  • FEED-FORWARD CARRIER RECOVERY SYSTEM AND METHOD
    Publication number: 20120045028
    Abstract: A method of feedforward phase recovery on a data stream is described. Phase estimation base points are calculated, at a phase detector, for each block of the received data stream. A current phase, at a phase interpolator, between two phase estimation base points. Data stream delays within the phase detector are matched with delays within the phase interpolator.
    Type: Application
    Filed: May 28, 2010
    Publication date: February 23, 2012
    Inventors: Dirk Schmitt, Wen Gao, Paul Gothard Knutson
  • METHOD AND APPARATUS FOR ITERATIVE TIMING AND CARRIER RECOVERY
    Publication number: 20120039380
    Abstract: Method and apparatus for iterative timing recovery for FTN signaling are provided. The iterative timing recovery method and apparatus uses a feedback timing error signal from a forward error correction block with an additional equalizer prior to a maximum a posteriori (MAP) decoder which matches the equalized FTN signal to a truncated inter-symbol interference (ISI) target. A timing error is then generated using a modified M&M timing error detector.
    Type: Application
    Filed: May 28, 2010
    Publication date: February 16, 2012
    Inventors: Dirk Schmitt, Paul Gothard Knutson, Wen Gao
  • Fan frame and heat dissipation fan incorporating the fan frame
    Patent number: 8113774
    Abstract: A fan frame (20) includes a bracket (22) and a base (24). The bracket includes a sidewall (225). An air inlet (228) is defined in a top side of the sidewall. An opposite air outlet (229) is defined in a bottom side of the sidewall. A plurality of first locking units (227) are formed on the sidewall. The base includes a main body (240), a plurality of ribs (242) and a plurality of second locking units (245). Each rib has a fixed end (2421) connected with the main body, and an opposite free end (2422). Each second locking unit is formed at the free end of a corresponding rib. The second locking units are detachably interlocked with the first locking units to mount the base to the bracket thereby to form the fan frame. The bracket and base are formed by materials having different strengths.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: February 14, 2012
    Assignees: Fu Zhun Precision Industry (Shen Zhen) Co., Ltd., Foxconn Technology Co., Ltd.
    Inventors: Zhi-Ya Yang, Wen-Gao Wang
  • Method for obtaining motion vector and image reference block in a code mode of fixed reference frame a number
    Patent number: 8116375
    Abstract: A method for obtaining an image reference block in a code mode of fixed reference frame number includes the steps of: performing motion estimation for each block of a current B frame and obtaining a motion vector MV of a corresponding block of a backward reference frame; discriminating whether the motion vector is beyond a maximum forward reference frame which is possibly pointed by the B frame, if not, then calculating the forward and backward motion vectors in a normal way; if yes, then using the motion vector of the forward reference frame that the B frame can obtain in the same direction to replace the motion vector of the corresponding block in the backward reference, and calculating the forward and the backward motion vectors of the B frame; finally, two image blocks pointed by the final obtained forward and backward motion vectors as the image reference blocks corresponding to the macro block.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: February 14, 2012
    Assignee: Institute of Computing Technology, Chinese Academy of Sciences
    Inventors: Wen Gao, Xiangyang Ji, Siwei Ma, Debin Zhao, Yan Lu
  • Method and apparatus for robust automatic frequency control in CDMA systems with constant pilot signals
    Patent number: 8107512
    Abstract: There is provided a method for generating an error signal for an automatic frequency control (AFC) loop in a Code Division Multiple Access (CDMA) system. Sign information relating to phase differences in received pilot signals is accumulated. In one embodiment, the accumulated sign information is compared against predetermined threshold levels. The error signal is generated when at least one of the predetermined threshold levels is satisfied. In a second embodiment, the accumulated sign information is decimated. An output of the decimating step is utilized as the error signal for the AFC loop.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: January 31, 2012
    Assignee: Thomson Licensing
    Inventors: Wen Gao, Zoran Kostic, Alton Shelbourne Keel
  • METHOD AND APPRATUS FOR SPECTRUM SENSING FOR OFDM SYSTEMS EMPLOYING PILOT TONES
    Publication number: 20110317750
    Abstract: Methods and apparatuses for OFDM spectrum sensing are provided. The proposed spectrum sensing algorithms are based on Time-Domain Symbol Cross-Correlation (TDSC-MRC and TDSC-NP methods) and can be applied to all existing wireless OFDM systems. The statistical behaviors of the TDSC-based spectrum sensors are explicitly analyzed. In addition, the spectrum sensing method employing the Cyclic Prefix of the OFDM modulated signals (CP method) is described for comparison purposes. The DVB-T Standard is adopted as an application example to illustrate the proposed spectrum sensing algorithms. Simulation results show that the TDSC-MRC method outperforms the CP method for all values of CP ratio considered. The TDSC methods have the advantage that the detection performances are the same for different CP ratios, while the detection performance of the CP method degrades dramatically when the CP ratio becomes small.
    Type: Application
    Filed: March 12, 2010
    Publication date: December 29, 2011
    Applicant: THOMSON LICENSING
    Inventors: Hou-Shin Chen, Wen Gao