Patents by Inventor Lujia Han

Lujia Han 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 frequency offset estimation and correction in orthogonal frequency division multiplexing system
    Patent number: 8774034
    Abstract: A frequency offset estimation and correction method in an orthogonal frequency division multiplexing (OFDM) system is disclosed in present invention, including: obtaining a pilot frequency domain channel estimation value of a target user, and smoothing the channel estimation value in frequency domain; obtaining the link quality state of a receiver; adopting a history smoothing algorithm or a multi-branch attempt algorithm to perform frequency offset estimation and frequency offset compensation, performing frequency domain demodulation for the data for which frequency offset compensation has been performed, and outputting a link quality state parameter; and updating the link quality state of the receiver according to the link quality state parameter, determining the output value of this frequency offset estimation and outputting a history frequency offset value required by next frequency offset estimation according to the determined output value of this frequency offset estimation.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: July 8, 2014
    Assignee: ZTE Corporation
    Inventors: Ping Li, Zhaohua Zeng, Hongfeng Qin, Weiju Sun, Lujia Han, Jie Lei
  • Method And Apparatus For Frequency Offset Estimation And Correction In Orthogonal Frequency Division Multiplexing System
    Publication number: 20120087263
    Abstract: A frequency offset estimation and correction method in an orthogonal frequency division multiplexing (OFDM) system is disclosed in present invention, including: obtaining a pilot frequency domain channel estimation value of a target user, and smoothing the channel estimation value in frequency domain; obtaining the link quality state of a receiver; adopting a history smoothing algorithm or a multi-branch attempt algorithm to perform frequency offset estimation and frequency offset compensation, performing frequency domain demodulation for the data for which frequency offset compensation has been performed, and outputting a link quality state parameter; and updating the link quality state of the receiver according to the link quality state parameter, determining the output value of this frequency offset estimation and outputting a history frequency offset value required by next frequency offset estimation according to the determined output value of this frequency offset estimation.
    Type: Application
    Filed: June 4, 2010
    Publication date: April 12, 2012
    Applicant: ZTE CORPORATION
    Inventors: Ping Li, Zhaohua Zeng, Hongfeng Qin, Weiju Sun, Lujia Han, Jie Lei