Patents by Inventor Chae Kwan Lee

Chae Kwan Lee 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).

  • Methods and systems of AGC and DC calibration for OFDM/OFDMA systems
    Patent number: 9219458
    Abstract: Methods and apparatus for automatic gain control (AGC) and DC calibration for orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) systems are provided in an effort to avoid saturation of the analog-to-digital converter (ADC) in a radio frequency (RF) front end of a receiver, to handle dynamic received signal power, or to avoid interruptions in a communication link for DC calibration. For certain embodiments, the quantization error in the RF front end may also be decreased.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: December 22, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Chae Kwan Lee
  • Methods and apparatus for synchronization and detection in wireless communication systems
    Patent number: 8537931
    Abstract: A synchronization and detection method in a wireless device may include performing coarse detection and synchronization with respect to a received signal. The synchronization and detection method may also include performing fine detection and synchronization for acquisition of the received signal. Results of the coarse detection and synchronization may be used for the fine detection and synchronization. The synchronization and detection method may also include performing tracking mode processing when the acquisition of the received signal has been achieved.
    Type: Grant
    Filed: January 4, 2008
    Date of Patent: September 17, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Jong Hyeon Park, Bok Tae Sim, Tae Ryun Chang, Je Woo Kim, Ju Won Park, Chae Kwan Lee, Sameer Nanavati
  • METHODS AND SYSTEMS OF AGC AND DC CALIBRATION FOR OFDM/OFDMA SYSTEMS
    Publication number: 20090310690
    Abstract: Methods and apparatus for automatic gain control (AGC) and DC calibration for orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) systems are provided in an effort to avoid saturation of the analog-to-digital converter (ADC) in a radio frequency (RF) front end of a receiver, to handle dynamic received signal power, or to avoid interruptions in a communication link for DC calibration. For certain embodiments, the quantization error in the RF front end may also be decreased.
    Type: Application
    Filed: June 12, 2008
    Publication date: December 17, 2009
    Applicant: QUALCOMM Incorporated
    Inventor: Chae Kwan Lee
  • METHODS AND APPARATUS FOR SYNCHRONIZATION AND DETECTION IN WIRELESS COMMUNICATION SYSTEMS
    Publication number: 20090175394
    Abstract: A synchronization and detection method in a wireless device may include performing coarse detection and synchronization with respect to a received signal. The synchronization and detection method may also include performing fine detection and synchronization for acquisition of the received signal. Results of the coarse detection and synchronization may be used for the fine detection and synchronization. The synchronization and detection method may also include performing tracking mode processing when the acquisition of the received signal has been achieved.
    Type: Application
    Filed: January 4, 2008
    Publication date: July 9, 2009
    Applicant: QUALCOMM INCORPORATED
    Inventors: Jong Hyeon Park, Bok Tae Sim, Tae Ryun Chang, Je Woo Kim, Ju Won Park, Chae Kwan Lee, Sameer Nanavati