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    11.
    发明专利
    未知

    公开(公告)号：DE60324184D1

    公开(公告)日：2008-11-27

    申请号：DE60324184

    申请日：2003-06-02

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： LEE SOK-KYU ,  KIM KWANG-SOON ,  CHANG KYUNG-HI

    IPC: H04B7/06 ,  H04J11/00 ,  H04J20060101 ,  H04L1/06 ,  H04L5/02 ,  H04L5/06 ,  H04L27/26 ,  H04W16/02 ,  H04W16/28 ,  H04W72/04

    Abstract: Disclosed are an adaptive pilot symbol assignment method that flexibly controls the number of transmit antennas according to each user's moving speed, channel status, or user request, and assigns proper pilot symbols in the downlink of an OFDMA (Orthogonal Frequency Division Multiplexing Access) based cellular system; and a sub-carrier allocation method for high-speed mobile that allocates some sub-carriers to assign proper pilot symbols for ultrahigh-speed mobile users, and the rest of the sub-carriers to the other users to assign proper pilot symbols to the users, on the assumption that the ultrahigh-speed mobile users have a traffic volume almost insignificant to the whole traffic volume.

    Frequency hopping method in orthogonal frequency division multiplexing system
    12.
    发明专利
    Frequency hopping method in orthogonal frequency division multiplexing system 未知

    公开(公告)号：AU2003282424A8

    公开(公告)日：2004-07-22

    申请号：AU2003282424

    申请日：2003-11-21

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： CHANG KYUNG-HI ,  LEE HEESOO

    IPC: H04B1/713 ,  H04J11/00 ,  H04L20060101 ,  H04L5/02 ,  H04L27/26 ,  H04L27/28

    Abstract: Disclosed is a frequency hopping method in an OFDM system, comprising: (a) detecting a mutual interference degree between different cells, and determining whether to use different frequency hopping patterns between the cells for interference averaging according to the mutual interference degree interference degree; (b) determining a number P of the different frequency hopping patterns needed between all the cells in the system; (c) generating the frequency hopping patterns of more than the number P and allocating the generated frequency hopping patterns to each cell, the frequency hopping patterns having the same frequency collision times between two channels in the different frequency hopping patterns; and (d) frequency-hopping the channels in each cell according to the allocated frequency hopping pattern.

    Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same
    13.
    发明专利
    Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same 未知

    公开(公告)号：AU2002356462A8

    公开(公告)日：2004-06-18

    申请号：AU2002356462

    申请日：2002-11-29

    Applicant: KOREA ELECTRONICS TELECOMM ,  CHUNG ANG UNIVERSITY

    Inventor： KIM KWANG-SOON ,  CHANG KYUNG-HI ,  CHO YONG-SOO ,  KIM TAE-GON

    IPC: H04B7/26 ,  H04L27/26 ,  H04L7/00

    Abstract: In an OFDMA-based cellular system, a frame of a downlink signal includes a common slot and traffic slots. The common slot includes a synchronization preamble and a cell search preamble. The synchronization preamble has a structure for synchronizing time and frequency, and the cell search preamble has a cell search structure. The traffic slot includes pilot symbols provided on the time and frequency axes. A cyclic prefix is used to estimate initial symbol synchronization, and the initial symbol synchronization and the synchronization preamble are used to synchronize the frame. The synchronization frame and the cell search preamble are used to estimate time and frequency synchronization. The cell search preamble is used to search cells. When the initial synchronization is performed, the cyclic prefix is used to track the frequency, the synchronization preamble is used to track symbol synchronization, and the cell search preamble is used to track fine frequency synchronization.

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