公开(公告)号：AU2002353638A8

公开(公告)日：2004-05-13

申请号：AU2002353638

申请日：2002-11-26

Applicant: KOREA ELECTRONICS TELECOMM ,  JOONG ANG UNIVERSITY

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.

公开(公告)号：DE602004024708D1

公开(公告)日：2010-01-28

申请号：DE602004024708

申请日：2004-09-08

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： JUNG SOO-JUNG ,  KIM KWANG-SOON ,  RYU BYUNG-HAN

IPC: H04J13/02 ,  H04L12/28 ,  H04B7/204 ,  H04B7/26 ,  H04L1/16 ,  H04L5/02 ,  H04L27/26 ,  H04W72/14 ,  H04W74/08

Abstract: Disclosed is a random access data transmission system and method using OFDMA. The system includes a scheduling ID into an access grant on a preamble for a random access, and transmits it together with an acknowledgment or a non-acknowledgment of the preamble, a base station uses the scheduling ID to notify the mobile station of a random access data transmittable time and a data transmission channel through a control channel, and the mobile station transmits a preamble in advance. After receiving a transmission assignment instruction corresponding to a scheduling ID through the control channel, the mobile station transmits random access data through an assigned channel.

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.

公开(公告)号：AU2003284727A1

公开(公告)日：2005-05-11

申请号：AU2003284727

申请日：2003-11-19

Applicant: KOREA ELECTRONICS TELECOMM ,  CHUNG ANG UNIVERSITY

Inventor： KIM KWANG-SOON ,  AHN JAE-YOUNG ,  CHO YONG SOO ,  KIM DONG-HAN

IPC: H04B7/26 ,  H04L27/26

Abstract: Disclosed is a downlink signal configuring method and device, and synchronization and cell search method and device using the same in a mobile communication system. A downlink frame has plural symbols into which pilot subcarriers are distributively arranged with respect to time and frequency axes. Initial symbol synchronization and initial frequency synchronization are estimated by using a position at which autocorrelation of a cyclic prefix of a downlink signal and a valid symbol of the downlink is maximized, and cell search and integer-times frequency synchronization are estimated by using pilot subcarriers included in the estimated symbol. Fine symbol synchronization, fine frequency synchronization, and downlink frame synchronization is estimated by using an estimated cell search result. Downlink frequency and time tracking is performed, cell tracking is performed by using a position set of pilot subcarriers inserted into the downlink frame, fine symbol synchronization tracking and fine frequency synchronization tracking are repeated by using the pilot subcarriers to perform the frequency and time tracking of the downlink frame.

公开(公告)号：AU2003241190A8

公开(公告)日：2004-07-09

申请号：AU2003241190

申请日：2003-06-02

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04J11/00 ,  H04B7/06 ,  H04J20060101 ,  H04L1/06 ,  H04L5/02 ,  H04L5/06 ,  H04L27/26 ,  H04W16/02 ,  H04W16/28 ,  H04W72/04 ,  H04Q7/38

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.

公开(公告)号：AU2003241190A1

公开(公告)日：2004-07-09

申请号：AU2003241190

申请日：2003-06-02

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04J11/00 ,  H04B7/06 ,  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.

公开(公告)号：EP1566007A4

公开(公告)日：2009-07-22

申请号：EP02808184

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

CPC classification number: H04L27/2656 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0053 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2678

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.

公开(公告)号：EP1554831A4

公开(公告)日：2011-06-08

申请号：EP02788992

申请日：2002-11-26

Applicant: KOREA ELECTRONICS TELECOMM ,  JOONG ANG UNIVERSITY

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

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

CPC classification number: H04L5/0044 ,  H04B1/713 ,  H04B1/7136 ,  H04B1/7143 ,  H04B2001/71367 ,  H04B2001/7154 ,  H04L1/0025 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/2628 ,  H04L27/2657

公开(公告)号：EP1695459A4

公开(公告)日：2012-07-25

申请号：EP03774257

申请日：2003-11-19

Applicant: KOREA ELECTRONICS TELECOMM ,  CHUNG ANG UNIVERSITY

Inventor： KIM KWANG-SOON ,  AHN JAE-YOUNG ,  CHO YONG SOO ,  KIM DONG-HAN

IPC: H04B7/26 ,  H04L27/26

CPC classification number: H04J11/0069 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2656 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2663 ,  H04L27/2665 ,  H04L27/2675 ,  H04L27/2678

Abstract: Disclosed is a downlink signal configuring method and device, and synchronization and cell search method and device using the same in a mobile communication system. A downlink frame has plural symbols into which pilot subcarriers are distributively arranged with respect to time and frequency axes. Initial symbol synchronization and initial frequency synchronization are estimated by using a position at which autocorrelation of a cyclic prefix of a downlink signal and a valid symbol of the downlink is maximized, and cell search and integer-times frequency synchronization are estimated by using pilot subcarriers included in the estimated symbol. Fine symbol synchronization, fine frequency synchronization, and downlink frame synchronization is estimated by using an estimated cell search result. Downlink frequency and time tracking is performed, cell tracking is performed by using a position set of pilot subcarriers inserted into the downlink frame, fine symbol synchronization tracking and fine frequency synchronization tracking are repeated by using the pilot subcarriers to perform the frequency and time tracking of the downlink frame.

Abstract translation: 本发明公开了配置使用相同的移动通信系统的方法和装置，以及同步和小区搜索的方法和装置的下行链路信号。下行链路帧具有多个符号插入到哪个导频子载波相对于时间轴和频率轴被分散配置。 初始符号同步和初始频率同步是通过使用在下行链路信号和下行链路的有效符号的循环前缀的哪个自相关的位置被最大化估计和小区搜索和整数倍频率同步是通过使用包括导频子载波估计 在估计的符号。 细符号同步，精细频率同步，和下行链路帧同步是通过使用在估计小区搜索结果来估计。 下行链路频率和时间跟踪进行，细胞跟踪执行通过使用位置 - 组插入到下行链路帧的导频子载波，细符号同步跟踪和精细频率同步跟踪是通过使用导频子载波来执行的频率和时间跟踪重复 下行链路帧。