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    FREQUENCY HOPPING METHOD IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM
    2.
    发明申请
    FREQUENCY HOPPING METHOD IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM 审中-公开
    正交频分复用系统中的频率选择方法

    公开(公告)号：WO2004059897A3

    公开(公告)日：2005-06-16

    申请号：PCT/KR0302531

    申请日：2003-11-21

    Applicant: KOREA ELECTRONICS TELECOMM ,  LEE HEESOO ,  CHANG KYUNG-HI

    Inventor： LEE HEESOO ,  CHANG KYUNG-HI

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

    CPC classification number: H04L5/023 ,  H04B1/7143 ,  H04B2001/7154 ,  H04J11/005 ,  H04L27/2601

    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; (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.

    Abstract translation: 公开了一种OFDM系统中的跳频方法，包括：（a）检测不同小区之间的相互干扰度，并根据相互干扰度确定是否在小区之间使用不同的跳频模式进行干扰平均; （b）确定系统中所有单元之间所需的不同跳频图案的数量P; （c）产生多于数字P的跳频模式，并将生成的跳频模式分配给每个小区，跳频模式在不同跳频模式中的两个信道之间具有相同的频率冲突时间; 和（d）根据分配的跳频图案对每个小区中的信道进行跳频。

    METHOD AND APPARATUS FOR EMBODYING AND SYNCHRONIZING DOWNLINK SIGNAL IN MOBILE COMMUNICATION SYSTEM AND METHOD FOR SEARCHING CELL USING THE SAME
    4.
    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：AU2002356462A1

    公开(公告)日：2004-06-18

    申请号：AU2002356462

    申请日：2002-11-29

    Applicant: KOREA ELECTRONICS TELECOMM

    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.

    FREQUENCY HOPPING METHOD IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM
    5.
    发明专利
    FREQUENCY HOPPING METHOD IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM 未知

    公开(公告)号：AU2003282424A1

    公开(公告)日：2004-07-22

    申请号：AU2003282424

    申请日：2003-11-21

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： LEE HEESOO ,  CHANG KYUNG-HI

    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.

    FREQUENCY HOPPING OFDMA METHOD USING SYMBOLS OF COMB PATTERN
    6.
    发明专利
    FREQUENCY HOPPING OFDMA METHOD USING SYMBOLS OF COMB PATTERN 未知

    公开(公告)号：AU2002353638A1

    公开(公告)日：2004-05-13

    申请号：AU2002353638

    申请日：2002-11-26

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： CHANG KYUNG-HI ,  KIM KWANG-SOON ,  CHO YONG-SOO ,  HA SUK-WON

    IPC: H04J11/00 ,  H04J99/00 ,  H04L1/00 ,  H04L5/02 ,  H04L27/26

    Abstract: Method for providing frequency-hopping OFDMA using symbols of comb patter, the method including the steps of: a) assigning frequency domain signal X(k) of comb pattern (comb symbol, k is frequency index) to modulated data sequence, the comb symbol comprising predetermined number of sub carriers (sub carrier group) which are placed with predetermined interval in the whole available frequency band; b) getting the comb symbol hopped for the comb symbol to have independent frequency offset; and c) inverse fast fourier transforming the comb symbol to time domain signal x(n) (n is time index) and transmitting the signal.

    7.
    发明专利
    未知

    公开(公告)号：AT411656T

    公开(公告)日：2008-10-15

    申请号：AT03730885

    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.

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