Patents by Inventor Songping Wu

Songping Wu 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: 8559569
    Abstract: Systems, methods, and other embodiments associated with preamble detection based on repeated preamble codes are described. According to one embodiment, an apparatus is provided that wirelessly receives a signal and calculates a differential output corresponding to a multiplication of the signal and a delayed version of the signal. A cross correlation is performed between the differential output and a known preamble pattern to produce a cross correlation output. A moving average calculation is performed on the cross correlation output to produce an average cross correlation. One or more peaks are detected in the average cross correlation when the average cross correlation has an amplitude greater than a threshold. When the one or more detected peaks meets predetermined criteria, the apparatus provides information about at least one of the detected peaks for subsequent signal processing.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: October 15, 2013
    Assignee: Marvell International Ltd.
    Inventors: Quan Zhou, Songping Wu, Daxiao Yu
  • Publication number: 20130242968
    Abstract: A beamforming training (BFT) data unit for transmission via a communication channel in a wireless personal area network is generated, and in particular, is for transmitting beamforming training information. A physical layer header and first BFT data are encoded using block encoding to generate a first block. Second BFT data are encoded using block encoding to generate a second block. The BFT data unit is generated with a fixed-length payload, such that the BFT data unit includes only i) a preamble, ii) the first block, and iii) the second block.
    Type: Application
    Filed: May 6, 2013
    Publication date: September 19, 2013
    Applicant: MARVELL WORLD TRADE LTD.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Manyuan Shen, Songping Wu, Hui-Ling Lou, Yong Liu
  • Publication number: 20130235908
    Abstract: A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,?1,1,?1,1,?1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers.
    Type: Application
    Filed: February 20, 2013
    Publication date: September 12, 2013
    Applicant: MARVELL WORLD TRADE LTD.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou
  • Publication number: 20130230126
    Abstract: Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal.
    Type: Application
    Filed: March 20, 2013
    Publication date: September 5, 2013
    Applicant: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Arul Durai Murugan Palanivelu, Hui-Ling Lou, Songping Wu
  • Patent number: 8498591
    Abstract: Systems and techniques relating to wireless communications are described.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: July 30, 2013
    Assignee: Marvell International Ltd.
    Inventors: Hua Qian, Songping Wu, Daxiao Yu
  • Patent number: 8488698
    Abstract: In a method for synchronizing a receiver to a synchronous signal, in a signal having been processed based on an automatic gain control (AGC) with a varying gain, a symbol is detected. An estimated beginning of a subsequent frame is determined based on the detected symbol. A gain of the AGC is fixed for a period during which the estimated start of the subsequent frame is processed by the AGC. A transform of the signal is analyzed to determine if the estimated start of the subsequent frame corresponds to an actual start of the subsequent frame. If the estimated start of the subsequent frame does not corresponds to the actual start of the subsequent frame, the gain of the AGC is allowed to resume varying and, a further symbol in the signal is detected, the signal having been processed based on the varying gain of the AGC.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: July 16, 2013
    Assignee: Marvell International Ltd.
    Inventors: Qing Zhao, Jungwon Lee, Leilei Song, Songping Wu, Hui-Ling Lou
  • Patent number: 8477813
    Abstract: In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, a beamforming training (BFT) data unit that conforms to a second format is transmitted, wherein a length of the BFT data unit is shorter than lengths supported by the first format, wherein the BFT data unit is for transmitting PHY beamforming training information. Information to indicate the BFT data unit conforms to the second format is transmitted to a receiving device. The BFT data unit is generated according to the second format, wherein the BFT data unit includes BFT information elements. The BFT data unit is then transmitted to the receiving device.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: July 2, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Manyuan Shen, Songping Wu, Hui-Ling Lou, Yong Liu
  • Patent number: 8446317
    Abstract: In a method for beamforming in communication a system, a plurality of different antenna weight vectors are generated. Each of the plurality of antenna weight vectors is a respective base vector of a unitary matrix. At least one training signal is transmitted a plurality of times via a plurality of antennas. A respective antenna weight vector from the plurality of different antenna weight vectors is applied each time the at least one training signal is transmitted. Feedback signals are received, where the feedback signals correspond to the at least one training signal transmitted the plurality of times and received at a receiver. A transmitter antenna weight vector is generated based on a mathematical combination of at least (i) the at least one training signal and (ii) the feedback signals.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: May 21, 2013
    Assignee: Marvell International Ltd.
    Inventors: Songping Wu, Manyuan Shen, Quan Zhou, Hongyuan Zhang, Hui-Ling Lou
  • Patent number: 8441968
    Abstract: Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: May 14, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Arul Durai Murugan Palanivelu, Hui-Ling Lou, Songping Wu
  • Publication number: 20130057506
    Abstract: This disclosure describes systems and techniques for implementing a touchscreen. These systems and/or techniques enable processing of a signal generated from one or more sensors of a touchscreen to reduce noise and increase accuracy.
    Type: Application
    Filed: July 24, 2012
    Publication date: March 7, 2013
    Inventors: Zixia Hu, Songping Wu, Bike Xie, Lun Dong
  • Patent number: 8385440
    Abstract: An apparatus includes a signal generator to output one of a first sequence or a second sequence and to augment sequences with cover codes, such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence of is zero, a physical layer preamble controller to control the signal generator to generate a preamble of a data unit, including a short training field (STF) formatter to cause the signal generator to generate an STF for use in at least frame synchronization, and a long training field (LTF) formatter to cause the signal generator to generate an LTF for use in at least channel estimation, such that the STF formatter controls the signal generator to include the first sequence in a last portion of the STF, and the LTF formatter controls the signal generator to include the second sequence in a beginning portion of the LTF.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: February 26, 2013
    Assignee: Marvel World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou
  • Patent number: 8385390
    Abstract: A system and method of extracting data from data packets transmitted over a wireless network includes receiving a data packet having a preamble portion and a payload portion. The preamble portion is cross correlated with a first known spreading sequence to generate a first timing signal and the preamble portion is cross correlated with a second known spreading signal to generate a frame timing signal. An impulse is detected in the first timing signal and a first timing parameter is set based upon the detected impulse in the first timing signal. An impulse is detected in the frame timing signal and a frame timing parameter is set based upon the detected impulse in the frame timing signal. Data is extracted from the received payload portion according to the first timing parameter and the frame timing parameter.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: February 26, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu
  • Patent number: 8358668
    Abstract: Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: January 22, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Arul Durai Murugan Palanivelu, Hui-Ling Lou, Songping Wu
  • Patent number: 8346174
    Abstract: A system including a sampling module that generates samples of RF signals on a first channel during first, second, and third periods, which do not overlap. A difference module determines a first difference between i) a first count of polarity reversals during the first period and ii) a second count of polarity reversals during the second period; a second difference between i) the second count and ii) a third count of polarity reversals during the third period; and a third difference between the first and second differences. A third module determines a frequency of the RF signals based on at least one of the first and second counts, determines a frequency variation of the RF signals based on the first and second counts, and identifies a radar type of the RF signals based on at least one of the third difference and the frequency variation.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: January 1, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Bhaskar V. Nallapureddy, Songping Wu, Tsunglun Yu, Hui-Ling Lou
  • Patent number: 8335167
    Abstract: Refining beamforming techniques for use in a communication system. In one embodiment, a method for beamforming in a communication system includes generating multiple training signals to be transmitted via multiple antennas over a communication channel, including applying a different antenna weight vector (AWV) to each of the multiple training signals. The method further includes receiving feedback generated using the multiple training signals, where the feedback includes a transmitter AWV for use with the multiple antennas and/or channel state information (CSI) descriptive of the communication channel.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: December 18, 2012
    Assignee: Marvell International Ltd.
    Inventors: Hongyuan Zhang, Hui-Ling Lou, Yong Liu, Songping Wu
  • Patent number: 8331419
    Abstract: A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: December 11, 2012
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou, Quan Zhou
  • Publication number: 20120272741
    Abstract: A coaxial cable sensor device with periodic impedance discontinuities along the length of its cable. The cable comprises an inner conductor, insulating material disposed around the length of the inner conductor, and an outer conductor disposed around the insulating material. The periodic impedance discontinuities are created by physical deformations or material alterations to at least one of the inner conductor, the outer conductor, and the insulating material. The sensor device may be used to measure temperature, pressure, strain, and acoustic waves in building structures, and is well suited for down-hole or underwater applications.
    Type: Application
    Filed: April 2, 2012
    Publication date: November 1, 2012
    Inventors: Hai Xiao, Jun Fan, Tao Wei, Songping Wu
  • Publication number: 20120219017
    Abstract: A transmitter device includes a controller configured to generate a first field and a second field. The first field is at least one of a packet synchronization information field or a frame boundary indication field, the second field is a channel estimation field starting after the first field ends. The controller is configured to generate the second field at least in part by generating a first channel estimation sequence (CES) symbol and a second CES symbol. At least one of i) a sequence in the first field serves as a cyclic prefix of the first CES symbol, ii) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or iii) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol.
    Type: Application
    Filed: May 7, 2012
    Publication date: August 30, 2012
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou, Quan Zhou
  • Publication number: 20120207181
    Abstract: A method for processing a preamble of a data packet, received via a communication channel, using a pair of complementary sequences, wherein a sum of out-of-phase aperiodic autocorrelation coefficients of the pair of complementary sequences is zero, and wherein the preamble includes a first field that provides synchronization information and a second field that provides channel estimation information, includes at least one of (i) correlating a received signal corresponding to the preamble with at least one sequence of the pair of complementary sequences to generate a plurality of respective correlation signals, or (ii) autocorrelating the received signal to generate an autocorrelation signal. The method also includes determining a cover code in the preamble using at least one of (i) the plurality of respective correlation signals, or (ii) the autocorrelation signal. The method also includes using the cover code to decode the preamble.
    Type: Application
    Filed: April 26, 2012
    Publication date: August 16, 2012
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Huk-Ling Lou
  • Publication number: 20120207192
    Abstract: In a wireless communication system wherein communication devices exchange information utilizing data units conforming to a first format, a method for generating a physical layer (PHY) data unit conforming to a second format and used to transmit PHY information includes generating a first sequence u of a channel estimation field (CEF) of the PHY data unit. The first sequence u of the CEF includes complementary Golay sequences a and b and is spread with a first cover code. The method also includes generating a second sequence v of the CEF. The second sequence v follows the first sequence u, includes the complementary Golay sequences a and b, and is spread with a second cover code different than the first cover code. The method also includes generating PHY information elements of the PHY data unit. The PHY information elements are not specified by the first format.
    Type: Application
    Filed: April 23, 2012
    Publication date: August 16, 2012
    Inventors: Hongyuan Zhang, Songping Wu, Hui-Ling Lou, Rohit U. Nabar