Patents by Inventor Jae-Choong Han

Jae-Choong 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 estimating a signal sequence in a MIMO-OFDM mobile communication system
    Patent number: 7333549
    Abstract: A apparatus and method for estimating a sequence of transmitted quadrature amplitude modulation (QAM)-modulated signals and space-time block coded signals using an optimal expectation-maximization (EM)-based iterative estimation algorithm in a multiple-input and multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) mobile communication system. An initial sequence estimation value is produced on the basis of a predetermined initial value using a pilot sub-carrier contained in each of OFDM signals received by a receiving side. A normalized value of a received signal on a channel-by-channel basis is produced by a predetermined equation using orthogonality between the OFDM signals received by the receiving side. At least one subsequent sequence estimation value is produced using the initial sequence estimation value and the normalized value of the received signal on the channel-by-channel basis.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: February 19, 2008
    Assignees: Samsung Electronics Co., Ltd., Seoul National University Industry Foundation
    Inventors: Jong-Ho Lee, Jae-Hak Chung, Chan-Soo Hwang, Seung-Hoon Nam, Do-Young Kwak, Jae-Choong Han, Seong-Cheol Kim
  • Method and apparatus for estimating a signal sequence in a MIMO-OFDM mobile communication system
    Publication number: 20040208254
    Abstract: A apparatus and method for estimating a sequence of transmitted quadrature amplitude modulation (QAM)-modulated signals and space-time block coded signals using an optimal expectation-maximization (EM)-based iterative estimation algorithm in a multiple-input and multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) mobile communication system. An initial sequence estimation value is produced on the basis of a predetermined initial value using a pilot sub-carrier contained in each of OFDM signals received by a receiving side. A normalized value of a received signal on a channel-by-channel basis is produced by a predetermined equation using orthogonality between the OFDM signals received by the receiving side. At least one subsequent sequence estimation value is produced using the initial sequence estimation value and the normalized value of the received signal on the channel-by-channel basis.
    Type: Application
    Filed: January 12, 2004
    Publication date: October 21, 2004
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jong-Ho Lee, Jae-Hak Chung, Chan-Soo Hwang, Seung-Hoon Nam, Do-Young Kwak, Jae-Choong Han, Seong-Cheol Kim