Patents by Inventor Qin Liu

Qin Liu 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 APPARATUS FOR EQUALIZATION OF TDS-OFDM SIGNALS
    Publication number: 20080232483
    Abstract: In an OFDM system having pseudo-noise (PN) sequences as guard intervals, a method for channel estimation and equalization is provided. The method comprising the steps of: providing a frequency equalization scheme; providing a time domain filter; and combining the frequency equalization with time-domain filter, thereby a time lag effect is taken into consideration for the channel estimation and equalization.
    Type: Application
    Filed: March 21, 2007
    Publication date: September 25, 2008
    Inventors: Lin Yang, Qin Liu
  • METHOD AND APPARATUS FOR ROBUST TIMING RECOVERY OF OFDM SYSTEM FOR FAST FADING CHANNELS
    Publication number: 20080232237
    Abstract: In an orthogonal frequency division multiplex (OFDM) communication system, a method comprising the step of performing time estimation in a time domain.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 25, 2008
    Applicant: LEGEND SILICON CORP.
    Inventor: Qin Liu
  • METHOD AND APPARATUS FOR EQUALIZATION OF FAST CHANGING CHANNELS IN A TDS-OFDM SYSTEM
    Publication number: 20080232451
    Abstract: A method for channel equalization is provided. The method comprises the steps of: subdividing a received symbol portion into segments wherein each segment is associated with a known, segmented channel characteristic among a set of segmented, known channel characteristics spanning the received symbol.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 25, 2008
    Applicant: LEGEND SILICON CORP.
    Inventor: Qin Liu
  • METHOD AND APPARATUS FOR ROBUST FREQUENCY EQUALIZATION
    Publication number: 20080232450
    Abstract: In frequency equalization, a received signals goes through frequency transform, the transformed signal is divided by a frequency transform of a channel response a method for equalization. The method comprises the step of: adjusting a quotient of the division by a weight function, wherein the function varies under a set of conditions; whereby for a frequency selective channel, deep fades are adjusted, and noise or interference are reduced.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 25, 2008
    Applicant: LEGEND SILICON CORP.
    Inventor: Qin Liu
  • METHOD AND APPARATUS FOR CHANNEL ESTIMATION OF OFDM WITH FREQUENCY INSERTED PILOTS
    Publication number: 20080232236
    Abstract: In an OFDM system having guard intervals interposed between symbols or frames, and having pilot signals distributed within the symbols or frames, a method for channel estimation is provided. The method comprising the steps of: in the time domain, performing an operation to obtain only a set of received pilots; and sectionalizing or subdividing the set of received pilots into a plurality of sub-sections; whereby a refined channel estimation is obtained on a sub-sectional basis.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 25, 2008
    Applicant: LEGEND SILICON CORP.
    Inventor: Qin Liu
  • METHOD AND APPARATUS FOR CHANNEL INTERPOLATION IN A TDS-OFDM SYSTEM OR DVB T/H SYSTEM
    Publication number: 20080232481
    Abstract: In an OFDM system, a method for interpolating comprising the steps of: subdividing at least one frame among a plurality of frames into segments; and using at least two known quantities to interpolate a corresponding estimate.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 25, 2008
    Applicant: LEGEND SILICON CORP.
    Inventor: Qin Liu
  • METHOD AND APPARATUS FOR MIMO CHANNEL ESTIMATION USING TDS-OFDM IN DOWNLINK TRANSMISSION IN THE FREQUENCY DOMAIN
    Publication number: 20080225968
    Abstract: In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system where both a transmitter and a receiver include a plurality of antennas, a method comprising the steps of: a receiver using at least one pseudo noise (PN) to associate desired information relating to a received symbol; and transforming the correlated information into frequency domain.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: Lin Yang, Qin Liu
  • METHOD AND APPARATUS FOR ID IDENTIFICATION USING PN FOR TDS-OFDM IN TRANSMISSION
    Publication number: 20080225694
    Abstract: In an OFDM system having PN sequences as guard intervals, a method is used for synchronization. The method comprises the steps of: providing a plurality of base stations; providing a plurality of mobile stations; both the base stations and the mobile stations are adapted to transmit and receive signals associated with a parameter using the PN sequences for synchronization.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: Lin Yang, Qin Liu
  • METHOD AND APPARATUS FOR MIMO CHANNEL ESTIMATION USING TDS-OFDM IN DOWNLINK TRANSMISSION IN THE TIME DOMAIN
    Publication number: 20080225967
    Abstract: In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system, a method is provided. In the OFDM MIMO wireless communication system, both a transmitter and a receiver include a plurality of antennas. The method comprising the step of: a receiver using at least one pseudo noise (PN) to correlate desired information relating to a received symbol; and performing channel estimation using the correlated information.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: LIN YANG, QIN LIU
  • METHOD AND APPARATUS FOR ADAPTIVE PN LENGTH FOR TDS-OFDM IN TRANSMISSION
    Publication number: 20080225969
    Abstract: In a TDS-OFDM system, a method for transmission is provided. The method comprises the step of: adjusting a PN sequence length, whereby a required performance is maintained. The adjusting step comprises increasing, decreasing, or keep unchanging the PN sequence length.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: LIN YANG, Qin Liu
  • METHOD AND APPARATUS FOR MIMO CHANNEL ESTIMATION IN A TDS-OFDM SYSTEM DOWNLINK USING A SUB-SPACE ALGORITHM IN THE FREQUENCY DOMAIN
    Publication number: 20080225977
    Abstract: In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system, a method is provided for channel estimation using a sub-space method suitable for computer implementation. The system has both a transmitter and a receiver including a plurality of antennas. The method comprising the step of: a receiver using at least one pseudo noise (PN) to correlate desired information relating to a received symbol; transforming the correlated information into frequency domain; and performing channel estimation using a sub-space method suitable for computer implementation.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: Lin Yang, Qin Liu
  • METHOD AND APPARATUS FOR SYNCHRONIZATION FOR MIMO TDS-OFDM SYSTEM
    Publication number: 20080225997
    Abstract: In a TDS-OFDM system, frequency offset estimate provided. A method for estimating a frequency offset comprising the step of correlating a known PN sequence with a received signal.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: Lin Yang, Qin Liu
  • METHOD AND APPARATUS FOR POWER ESTIMATION FOR TDSOFDM IN TRANSMISSION
    Publication number: 20080226007
    Abstract: A method and apparatus for a receiver to estimate the received power for each transmitting BS. The power measure can be obtained by using some or all receiving antennas.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: Lin Yang, Qin Liu
  • METHOD AND APPARATUS FOR SYNCHRONIZATION FOR MIMO TDS-OFDM SYSTEM
    Publication number: 20080225978
    Abstract: In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system where both a transmitter and a receiver include a plurality of antennas, a method comprising the step of: a receiver using at least one pseudo noise (PN) to correlate desired information relating to a received symbol.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Applicant: LEGEND SILICON CORP.
    Inventors: LIN YANG, Qin Liu
  • Resistivity phase change material
    Patent number: 7382512
    Abstract: Various devices and methods employing a resistive phase change material are disclosed.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: June 3, 2008
    Inventors: Zhizhang Chen, Qin Liu, Timothy F. Myers, Chien-Hua Chen
  • MRI/MRS gradient coil with integrated cooling circuits
    Patent number: 7339376
    Abstract: Systems, methods and apparatus are provided through which heat produced in the patient examination space by the power used to create electromagnetic fields in an MRI/MRS system is significantly reduced by coolant carried by one of two split connected concentric coil layers of one of two of the primary gradient coils used to alter the main magnetic field. The coil carrying the coolant is made of copper tubing. The second primary gradient coil is placed between the layers of the split primary gradient coil. Adjusting the number of turns in each layer of the split primary gradient coil adjusts the heat generated. The inductances and resistances of the two primary gradient coils are balanced by adjusting the gain of the coils.
    Type: Grant
    Filed: April 9, 2006
    Date of Patent: March 4, 2008
    Assignee: General Electric Company
    Inventor: Qin Liu
  • Multi-level layer
    Publication number: 20080043166
    Abstract: Various methods and apparatus relating to a multi-level layer are disclosed.
    Type: Application
    Filed: July 28, 2006
    Publication date: February 21, 2008
    Inventors: Qin Liu, Bradley D. Chung, John C. Rudin, Frank E. Glass
  • METHOD FOR CHANNEL ESTIMATION
    Publication number: 20080025418
    Abstract: A channel estimation using the received PN (pseudo-noise) sequence associated with a received frame among a plurality of associated, neighboring frames. The estimation using a value associated with a point of a currently frame as a denominator in a predetermined formula. If the value is smaller than its corresponding value in a neighboring frame, the neighboring frame's corresponding value is used instead of the value of the current frame.
    Type: Application
    Filed: October 17, 2006
    Publication date: January 31, 2008
    Applicant: LEGEND SILICON
    Inventors: QIN LIU, Dinesh Venkatachalam
  • METHOD AND DEVICE FOR FREQUENCY DOMAIN COMPENSATION FOR CHANNEL ESTIMATION AT AN OVER SAMPLING RATE IN A TDS_OFDM RECEIVER
    Publication number: 20080025377
    Abstract: In a TDS-OFDM receiver a device for frequency-domain compensation for channel estimation at an over-sampling rate is provided. The device includes a correlater for correlating a first signal and a second signal; a transformer for transforming the correlated signals into a frequency domain; and an interpolater and truncater block for interpolating and truncating the transformed signal to have the interpolated and truncated, transformed signal as a reference for future use.
    Type: Application
    Filed: October 17, 2006
    Publication date: January 31, 2008
    Applicant: LEGEND SILICON
    Inventors: QIN LIU, Dinesh Venkatachalam
  • METHOD AND APPARATUS FOR FREQUENCY DOMAIN EXUALIZATION BASED UPON A DECISION FEEDBACK IN A TDS-OFDM RECEIVER
    Publication number: 20080025384
    Abstract: A device for equalization adapted for receiving a symbol and a channel frequency response is provided. The device includes a slicer for delimiting the channel frequency response to a sliced channel frequency response based upon a signal constellation; and a divider for dividing the received symbol using the sliced channel frequency response as the divider, with a resultant quotient of the divider as a reference point for future received symbols.
    Type: Application
    Filed: October 17, 2006
    Publication date: January 31, 2008
    Applicant: LEGEND SILICON
    Inventors: Qin Liu, Dinesh Venkatachalam