Patents by Inventor Sigang Qiu

Sigang Qiu 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: 8842790
    Abstract: Methods and systems to synchronize to a remote node counting rate, symbol rate, and carrier frequency as functions of an estimated frequency offset and relationships between the remote node carrier frequency and counting rate, and between the remote node carrier frequency and symbol rate. The carrier frequency offset may be scaled in accordance with a ratio between the carrier frequency and the remote counting rate to synchronize the local counting rate with the remote counting rate, and/or scaled in accordance with a relationship between the carrier frequency and the remote symbol rate to synchronize the local receive path and/or transmit path sample rate with the remote symbol rate. The carrier frequency offset may be applied as compensation in the receive path and/or the transmit path. The remote and local nodes may correspond to a network coordinator and an existing node, respectively, in a Multimedia Over Coax (MoCA) environment.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: September 23, 2014
    Assignee: Intel Corporation
    Inventors: Kennan Laudel, Baohong Liu, Sowmiya Narasimhan, Sigang Qiu, Yongfang Guo
  • Publication number: 20110150160
    Abstract: Methods and systems to synchronize to a remote node counting rate, symbol rate, and carrier frequency as functions of an estimated frequency offset and relationships between the remote node carrier frequency and counting rate, and between the remote node carrier frequency and symbol rate. The carrier frequency offset may be scaled in accordance with a ratio between the carrier frequency and the remote counting rate to synchronize the local counting rate with the remote counting rate, and/or scaled in accordance with a relationship between the carrier frequency and the remote symbol rate to synchronize the a local receive path and/or transmit path sample rate with the remote symbol rate. The carrier frequency offset may applied as compensation in the receive path and/or the transmit path. The remote and local nodes may correspond to a network coordinator and an existing node, respectively, in a Multimedia Over Coax (MoCA) environment.
    Type: Application
    Filed: December 22, 2009
    Publication date: June 23, 2011
    Inventors: KENNAN KEN LAUDEL, BAOHONG LIU, SOWMIVA NARASIMHAN, SIGANG QIU, YONGFANG GUO
  • Patent number: 7729663
    Abstract: A technique for modifying communication operational parameters using fast, low complexity, accurately calculated SNR values. Techniques may improve upon prior art by calculating SNR values in a more color noise insensitive manner in the frequency domain. An agent may be implemented to calculate SNR values and either store or use the SNR values to modify operational parameters in communicative system.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: June 1, 2010
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Chih-Kang Chen, Kerry Cai
  • Patent number: 7706768
    Abstract: A method for switched diversity, including: determining, on a pair-wise basis, a plurality of comparative quality factors corresponding to at least two antennas based on signals received by the at least two antennas; filtering, over a period of time, multiple instances of at least one of the plurality of comparative quality factors; and selecting at least one of the signals to couple to at least one receiver chain based on the comparative quality factors.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: April 27, 2010
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Sathish K. Kumar, Atul A. Salvekar
  • Patent number: 7484136
    Abstract: A technique for modifying communication operational parameters using fast, low complexity, accurately calculated SNR values. Techniques may improve upon prior art by calculating SNR values in a more time efficient and accurate manner in time domain. An agent may be implemented to calculate SNR values and either store or use the SNR values to modify operational parameters in communicative system.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: January 27, 2009
    Assignee: Intel Corporation
    Inventor: Sigang Qiu
  • Patent number: 7418065
    Abstract: A multicarrier receiver sequentially correlates two training symbols to determine a length of a cyclic prefix associated with each of the training symbols.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: August 26, 2008
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Minh-Anh Vuong, Atul Salvekar, Xiaoshu Qian
  • Patent number: 7406157
    Abstract: Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of downstream multi-carrier tones of a digital subscriber line activation process are received at an extended voice-band modem and are capable of transmitting upstream multi-carrier tones of the digital subscriber line activation process over a local loop. The downstream carrier tones and the upstream carrier tones are folded into a first multi-tone signal and a second multi-tone signal, respectively, each having a plurality of component signals within the spectrum band of the extended voice-based modem. The total signal power of the first multi-tone signal is divided by the power of one of the plurality of component signals of the second multi-tone signal to determine a ratio value. The ratio value is used to determine a characteristic of the local loop.
    Type: Grant
    Filed: September 3, 2003
    Date of Patent: July 29, 2008
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Prashant Pratap Tawade, Vedavalli G. Krishnan, Wesley H. Smith, Mandayam Krishnan
  • Patent number: 7339996
    Abstract: A technique is proposed to accurately estimate the Network CODEC levels for each PCM code a server modem generates. These levels are affected by the digital impairments such as Digital attenuation PAD in the trunk, the Robbed Bit Signaling, the type of CODEC (?-law or a-law—or non standard), and by analog impairments such as loop distortion, noise, inter-modulation distortion, echo. At client modem equalizer output good estimates for these levels are derived. By detecting RBS pattern of the trunk, and using averages of decode levels of similar RBS slots, more accurate data points are obtained. By further replacing these levels with the closest CODEC receive levels, good accuracy is obtained. Non-monotonic points are detected and eliminated. An upper limit is set for constellation points to avoid saturation of the receiver. IMD correction is applied to the decode levels. Ideal points that are not signaled, are added if possible.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: March 4, 2008
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Vedavalli Gomatam Krishnan, Bo Zhang
  • Publication number: 20080032654
    Abstract: A comparative quality factor may be based on quantities indicative of signal and noise received at multiple antennas and may be used to control switching in a switched diversity system.
    Type: Application
    Filed: August 2, 2006
    Publication date: February 7, 2008
    Applicant: INTEL CORPORATION
    Inventors: Sigang Qiu, Sathish K. Kumar, Atul A. Salvekar
  • Publication number: 20080022161
    Abstract: A technique for modifying communication operational parameters using fast, low complexity, accurately calculated SNR values. Techniques may improve upon prior art by calculating SNR values in a more color noise insensitive manner in the frequency domain. An agent may be implemented to calculate SNR values and either store or use the SNR values to modify operational parameters in communicative system.
    Type: Application
    Filed: June 30, 2006
    Publication date: January 24, 2008
    Inventors: Sigang Qiu, Chih-Kang Chen, Kerry Cai
  • Publication number: 20080022162
    Abstract: A technique for modifying communication operational parameters using fast, low complexity, accurately calculated SNR values. Techniques may improve upon prior art by calculating SNR values in a more time efficient and accurate manner in time domain. An agent may be implemented to calculate SNR values and either store or use the SNR values to modify operational parameters in communicative system.
    Type: Application
    Filed: June 30, 2006
    Publication date: January 24, 2008
    Inventor: Sigang Qiu
  • Patent number: 7136439
    Abstract: A method, apparatus, and system for adaptively synchronizing a sampling clock.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: November 14, 2006
    Assignee: Intel Corporation
    Inventor: Sigang Qiu
  • Patent number: 7103147
    Abstract: Embodiments of the invention provide methods and apparatuses to determine the characteristics of a local loop using the multi-tone line-probing signals of a standard voice-based modem. For one embodiment, the multi-tone, line-probing signals of a voice-band modem are transmitted over a local loop and received at a standard voice band modem. Discrete Fourier transform values are determined for each of two or more frequencies of the plurality of frequencies of the multi-tone signals. A set of discrete Fourier transform values corresponding to a set of high frequencies is summed to obtain a first value and a set of discrete Fourier transform values corresponding to a set of low frequencies is summed to obtain a second value. A power ratio is determined by dividing the first value by the second value. The power ratio is then used to determine a characteristic of the local loop.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: September 5, 2006
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Prashant Pratap Tawade, Vedavalli G. Krishna, Wesley H. Smith, Mandayam G. Krishnan, Bo G. Zhang
  • Patent number: 7068755
    Abstract: In some embodiments, a method includes performing at least part of a digital subscriber line (DSL) handshaking process by transmitting at least one handshaking signal via a telephone subscriber loop, and analyzing the at least one handshaking signal to detect a characteristic of the telephone subscriber loop.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: June 27, 2006
    Assignee: Intel Corporation
    Inventor: Sigang Qiu
  • Publication number: 20060067412
    Abstract: A multicarrier receiver sequentially correlates two training symbols to determine a length of a cyclic prefix associated with each of the training symbols.
    Type: Application
    Filed: September 29, 2004
    Publication date: March 30, 2006
    Inventors: Sigang Qiu, Minh-Anh Vuong, Atul Salvekar, Xiaoshu Qian
  • Publication number: 20050180529
    Abstract: A method, apparatus, and system for detecting a tone.
    Type: Application
    Filed: March 29, 2005
    Publication date: August 18, 2005
    Inventors: Sigang Qiu, Wesley Smith
  • Patent number: 6931076
    Abstract: A method, apparatus, and system for detecting a tone. In some embodiments, a signal is communicated by applying a first quantity of samples per period and a second quantity of samples per period. The samples may then be translated into information. For example, the first and second quantity of samples may be translated into information and identified. According to some embodiments, a signal communicates information at at least two different frequencies simultaneously to determine a common carrier for transmitting and receiving nodes.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: August 16, 2005
    Assignee: Intel Corporation
    Inventors: Sigang Qiu, Wesley Smith
  • Publication number: 20050135568
    Abstract: In one embodiment, a method is provided. The method of this embodiment provides receiving a communication having a data sample set, generating a selective data sample set based, at least in part, on the data sample set, and using the selective data sample set to update a training algorithm using an updating algorithm.
    Type: Application
    Filed: December 23, 2003
    Publication date: June 23, 2005
    Inventor: Sigang Qiu
  • Publication number: 20050047443
    Abstract: Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of downstream multi-carrier tones of a digital subscriber line activation process are received at an extended voice-band modem and are capable of transmitting upstream multi-carrier tones of the digital subscriber line activation process over a local loop. The downstream carrier tones and the upstream carrier tones are folded into a first multi-tone signal and a second multi-tone signal, respectively, each having a plurality of component signals within the spectrum band of the extended voice-based modem. The total signal power of the first multi-tone signal is divided by the power of one of the plurality of component signals of the second multi-tone signal to determine a ratio value. The ratio value is used to determine a characteristic of the local loop.
    Type: Application
    Filed: September 3, 2003
    Publication date: March 3, 2005
    Inventors: Sigang Qiu, Prashant Tawade, Vedavalli Krishnan, Wesley Smith, Mandayam Krishnan
  • Publication number: 20050041782
    Abstract: In some embodiments, a method includes performing at least part of a digital subscriber line (DSL) handshaking process by transmitting at least one handshaking signal via a telephone subscriber loop, and analyzing the at least one handshaking signal to detect a characteristic of the telephone subscriber loop.
    Type: Application
    Filed: August 20, 2003
    Publication date: February 24, 2005
    Inventor: Sigang Qiu