Patents by Inventor Chi-ho Cha

Chi-ho Cha 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).

  • CIRCUIT EMULATION WITH STATE RECOVERY
    Publication number: 20070265823
    Abstract: A circuit emulation system and method are provided, the system including at least one trace chain and a trace memory in signal communication with the at least one trace chain for sequentially receiving values and feeding them back through the chain to their original storage unit positions; and the method including modeling the circuit, providing at least one storage unit in the model, emulating the circuit with the model, extracting a state of the at least one storage unit during emulation, storing the extracted state, and restoring the stored state through a feedback loop.
    Type: Application
    Filed: February 9, 2007
    Publication date: November 15, 2007
    Inventors: Chi-Ho Cha, Hyunuk Jung
  • Orthogonal frequency division multiplexing (OFDM) receiver used in wireless local area network system and symbol timing synchronization method therefor
    Patent number: 7280605
    Abstract: An Orthogonal Frequency Division Multiplexing (OFDM) receiver of a wireless Local Area Network (LAN) system uses double cross-correlation and double peak-value comparison for symbol timing synchronization. The OFDM receiver of the wireless LAN system performs first differential cross-correlation using a short training symbol as a reference signal, performs second differential cross-correlation for an output value of the first differential cross-correlation, and performs double peak-value comparison for an output value of the second differential cross-correlation. In this way, fast symbol synchronization is achieved due to an excellent correlation property. Accordingly, a wireless LAN system including the OFDM receiver has a high response speed.
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: October 9, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chi-ho Cha
  • Orthogonal frequency division multiplexing (OFDM) receiver used in wireless local area network system and symbol timing synchronization method therefor
    Publication number: 20040223554
    Abstract: An Orthogonal Frequency Division Multiplexing (OFDM) receiver of a wireless Local Area Network (LAN) system uses double cross-correlation and double peak-value comparison for symbol timing synchronization. The OFDM receiver of the wireless LAN system performs first differential cross-correlation using a short training symbol as a reference signal, performs second differential cross-correlation for an output value of the first differential cross-correlation, and performs double peak-value comparison for an output value of the second differential cross-correlation. In this way, fast symbol synchronization is achieved due to an excellent correlation property. Accordingly, a wireless LAN system including the OFDM receiver has a high response speed.
    Type: Application
    Filed: March 17, 2004
    Publication date: November 11, 2004
    Inventor: Chi-ho Cha