公开(公告)号：JP2002135783A

公开(公告)日：2002-05-10

申请号：JP2000403357

申请日：2000-12-28

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM HYONCHORU ,  AHN SUNG-HO ,  KANG MIN-GYU ,  KIM DOO-HYEON ,  HWANG SEUNG-KU

IPC: H04N19/132 ,  H04J3/00 ,  H04L29/08 ,  H04N7/12 ,  H04N7/173 ,  H04N7/50 ,  H04N19/159 ,  H04N19/166 ,  H04N19/176 ,  H04N19/196 ,  H04N19/30 ,  H04N19/40 ,  H04N19/423 ,  H04N19/46 ,  H04N19/587 ,  H04N19/60 ,  H04N19/625 ,  H04N19/70 ,  H04N21/24 ,  H04N21/2662 ,  H04N7/30

Abstract: PROBLEM TO BE SOLVED: To provide a processing method of variable bit rate and recording medium for providing a multimedia streaming service with diversified bit rates in response to changes in the band width of a communication network. SOLUTION: In a processing method of variable bit rate for streaming service to be applied to an information communication system, a first step of dividing already stored original video bit stream into file formats enabling to support the variable bit rates for storing, a second step of re-integrating the divided data in the format and a third step of providing the streaming service by using the re-integrated video bit stream are equipped.

公开(公告)号：WO2005022792A2

公开(公告)日：2005-03-10

申请号：PCT/KR2004002073

申请日：2004-08-18

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  YEH CHOONG-IL ,  LIM HYOUNG-SOO ,  LEE YU-RO ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU

Inventor： YEH CHOONG-IL ,  LIM HYOUNG-SOO ,  LEE YU-RO ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU

IPC: H04L27/26 ,  H04J20060101 ,  H04J

CPC classification number: H04L5/0007 ,  H04L5/0041 ,  H04L5/005 ,  H04L27/2613 ,  H04L27/2656

Abstract: Disclosed are a method of constructing a wireless network in an OFDM system using a single carrier and a terminal employing an OFDM method. The terminal discriminates a wireless network using multiple carriers from a wireless network using a single carrier through a downlink preamble, and acquires frame synchronization within a short period of time. In addition, the terminal determines a position of a CCS used by a cell/sector to which the terminal belongs. Furthermore, the invention proposes a pilot allocation method that can be applied to a wireless network using a single carrier, which obtains frequency diversity effects while effectively using resources. In the case where a wireless network operator uses N channels in N divided FFT domains, the actual number of channels is MN.

Abstract translation: 公开了一种在使用单载波的OFDM系统和采用OFDM方法的终端中构建无线网络的方法。 该终端通过下行链路前同步码使用单载波来区分来自无线网络的多个载波的无线网络，并在短时间内获取帧同步。 此外，终端确定终端所属的小区/扇区使用的CCS的位置。 此外，本发明提出了一种可以应用于使用单载波的无线网络的导频分配方法，其在有效地使用资源的同时获得频率分集效应。 在无线网络运营商在N个分割的FFT域中使用N个信道的情况下，实际的信道数是MN。

公开(公告)号：WO2005008359A3

公开(公告)日：2005-11-17

申请号：PCT/KR2004001780

申请日：2004-07-16

Applicant: KOREA ELECTRONICS TELECOMM ,  KT CORP ,  SAMSUNG ELECTRONICS CO LTD ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  YOON CHUL-SIK ,  LIM SOON-YONG ,  KIM JAE-HEUNG ,  YEO KUN-MIN ,  RYU BYUNG-HAN ,  HWANG SEUNG-KU

Inventor： YOON CHUL-SIK ,  LIM SOON-YONG ,  KIM JAE-HEUNG ,  YEO KUN-MIN ,  RYU BYUNG-HAN ,  HWANG SEUNG-KU

IPC: H04B7/26 ,  G06F20060101 ,  G06F1/32 ,  H04L12/16 ,  H04L12/28 ,  H04L12/54

CPC classification number: G06F1/3209 ,  H04W52/0219 ,  H04W76/04 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/146

Abstract: Disclosed is a power saving mode control system (200) and method in a wireless portable Internet system. Stations in the sleep mode are grouped by aligning listening intervals of the stations which enter the sleep mode in the power saving management system wherein the sleep interval for receiving no traffic data is exponentially increased. Therefore, the sleep mode of the grouped subscriber stations are easily managed, and power saving efficiency is enhanced and system complexity is lowered by easily and quickly detecting data states provided to the corresponding stations.

Abstract translation: 公开了一种无线便携式因特网系统中的省电模式控制系统（200）和方法。 在省电管理系统中，通过对进入休眠模式的站的监听间隔进行对睡眠模式中的站进行分组，其中用于接收没有业务数据的睡眠间隔指数地增加。 因此，容易地管理分组用户站的睡眠模式，并且通过容易且快速地检测提供给相应站的数据状态来提高省电效率并降低系统复杂度。

公开(公告)号：AT532296T

公开(公告)日：2011-11-15

申请号：AT04774144

申请日：2004-07-16

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  SK TELECOM CO LTD ,  KT CORP ,  KT FREETEL CO LTD ,  HANARO TELECOM INC

Inventor： KIM JAE-HEUNG ,  LIM SOON-YONG ,  YOON CHUL-SIK ,  YEO KUN-MIN ,  SHIN SEOK-JOO ,  SONG BOONG-GEE ,  EOM KWANG-SEOP ,  CHO MIN-HEE ,  CHO JAE-HEE ,  RYU BYUNG-HAN ,  HWANG SEUNG-KU

IPC: H04B7/26 ,  H04L12/56

公开(公告)号：WO2005043791A3

公开(公告)日：2007-09-20

申请号：PCT/KR2004002445

申请日：2004-09-23

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  LIM HYOUNG-SOO ,  KWON DONG-SEUNG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  CHO SEONG-CHUL ,  LEE YU-RO ,  OH JONG-EE ,  HWANG SEUNG-KU ,  YOON SOON-YOUNG ,  SUNG SANG-HOON ,  CHO JAE-HEE ,  HWANG IN-SEOK ,  HUH HOON

Inventor： LIM HYOUNG-SOO ,  KWON DONG-SEUNG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  CHO SEONG-CHUL ,  LEE YU-RO ,  OH JONG-EE ,  HWANG SEUNG-KU ,  YOON SOON-YOUNG ,  SUNG SANG-HOON ,  CHO JAE-HEE ,  HWANG IN-SEOK ,  HUH HOON

IPC: H04J11/00 ,  H04L27/26 ,  H04L20060101

CPC classification number: H04L27/2613

Abstract: Disclosed is a method for constructing a downlink frame in a mobile data communication system using an OFDMA method. To construct the downlink frame, a single preamble is arranged at the head of the downlink frame, and a plurality of data symbols are arranged following the preamble. Then, a plurality of pilot symbols are inserted between the data symbols over the downlink frame at a predetermined period. Accordingly, a channel variation can be rapidly tracked using the preamble and pilot symbols. Furthermore, interference between adjacent cells is minimized and averaged to make a frequency reuse rate be 1, such that arrangement of multiple cells can be easily designed.

Abstract translation: 公开了一种使用OFDMA方法在移动数据通信系统中构建下行链路帧的方法。 为了构建下行链路帧，在下行链路帧的头部设置单个前导码，并且在前导码之后配置多个数据符号。 然后，多个导频符号以预定周期通过下行链路帧插入数据符号之间。 因此，可以使用前同步码和导频符号快速跟踪信道变化。 此外，相邻小区之间的干扰被最小化并被平均以使频率重用率为1，使得可以容易地设计多个小区的布置。

公开(公告)号：WO2005062728A3

公开(公告)日：2006-08-31

申请号：PCT/KR2004002730

申请日：2004-10-27

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  LIM HYOUNG-SOO ,  YEH CHOONG-IL ,  LEE YU-RO ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU

Inventor： LIM HYOUNG-SOO ,  YEH CHOONG-IL ,  LEE YU-RO ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU

IPC: H04J11/00

CPC classification number: H04J11/00 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2675

Abstract: Disclosed are a method for constructing a frame preamble in an OFDM wireless communication system, and a method for acquiring frame synchronization and searching cells using the preamble. The preamble is arranged at the beginning of a frame and constructed of a pattern repeated an integer number of times, and a CP. The pattern has a length shorter than a single OFDM symbol interval. The length of the repetitive pattern is not limited to an integer number of times a single OFDM symbol interval. Frame synchronization can be acquired by observing cross-correlation of a received signal and reference patterns and detecting the moment when the absolute value of the cross-correlation exceeds a predetermined threshold. Otherwise, frame synchronization can be acquired by observing auto-correlation of the received signal using repeated patterns included in the received signal and detecting the moment when the absolute value of the auto-correlation becomes the maximum value.

Abstract translation: 公开了一种在OFDM无线通信系统中构造帧前同步码的方法，以及用于使用前置码获取帧同步和搜索小区的方法。 前导码被布置在帧的开始处，并且由重复整数次的模式和CP构成。 该模式的长度短于单个OFDM符号间隔。 重复模式的长度不限于单个OFDM符号间隔的整数倍。 可以通过观察接收信号和参考模式的互相关并且检测互相关的绝对值超过预定阈值的时刻来获取帧同步。 否则，可以通过使用包括在接收信号中的重复模式来观察接收信号的自相关并且检测自相关的绝对值成为最大值的时刻来获取帧同步。

公开(公告)号：WO2006052058A3

公开(公告)日：2006-10-26

申请号：PCT/KR2005002592

申请日：2005-08-10

Applicant: KOREA ELECTRONICS TELECOMM ,  IND ACADEMIC COOP ,  SONG YOUNG-SEOG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  LEE SEUNG-JOON ,  LIM HYOUNG-SOO ,  LIM KWANG-JAE ,  LEE YU-RO ,  OH JONG-EE ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU ,  LEE CHUNG-YONG ,  SHIN MYEONG-CHEOL

Inventor： SONG YOUNG-SEOG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  LEE SEUNG-JOON ,  LIM HYOUNG-SOO ,  LIM KWANG-JAE ,  LEE YU-RO ,  OH JONG-EE ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU ,  LEE CHUNG-YONG ,  SHIN MYEONG-CHEOL

IPC: H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06 ,  H04N7/08

CPC classification number: H04B7/061 ,  H04B7/0669 ,  H04B7/0691 ,  H04B7/08 ,  H04L1/0003 ,  H04L1/0637 ,  H04L1/0675

Abstract: The present invention relates to a multi-input multi-output (MIMO) system for enhancin transmission performance. The MlMO system uses space-time encoding and transmi antenna selection methods, and includes a transmitter (100) and a receiver (200). Th transmitter (100) includes N transmit antennas (130-1 , 130-4) that are more than M tansrni antennas (130-1 , 130-3) used for tansmitting a signal to space channel, selects the M transmi antennas (130-1, 130-3) among the N tansmit antennas (130-3 130-4), and tansmits symbol by space-time encoding the symbol. The receiver (200) includes M receive antenna (120-1 , 210-2) for receiving a signal from the space channel, detects an information symb by using the signal received through the receive antenna (210-1 , 210-2), generates transmi antenna selection information for selecting M transmit antennas (130-1 , 130-3) among tansmit antennas (i30-1,...7130-4) with reference to a channel estimate, and returns th information to the tansmitter.

Abstract translation: 本发明涉及用于增强传输性能的多输入多输出（MIMO）系统。 M10M系统使用时空编码和天线选择方法，并且包括发射机（100）和接收机（200）。 Th发射机（100）包括N个发射天线（130-1,130-4），其多于用于将信号转发到空间信道的M个天线（130-1,130-3），选择M个发射天线（130 -1,130-3），并且通过对码元进行空时编码来对码元进行篡改。 接收器（200）包括用于从空间信道接收信号的M个接收天线（120-1,210-2），通过使用通过接收天线（210-1,210-2）接收的信号来检测信息， 生成用于参照信道估计在篡改天线（i30-1，... 7130-4）中选择M个发送天线（130-1,130-3）的发送天线选择信息，并将该信息返回给转发器。

公开(公告)号：WO2005048497A2

公开(公告)日：2005-05-26

申请号：PCT/KR2004002436

申请日：2004-09-22

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  LEE YU-RO ,  HONG DAE-SIK ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  LIM HYOUNG-SOO ,  CHO SEONG-CHUL ,  OH JONG-EE ,  KWON DONG-SEUNG ,  AHN JEE-HWAN ,  HWANG SEUNG-KU

Inventor： LEE YU-RO ,  HONG DAE-SIK ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  LIM HYOUNG-SOO ,  CHO SEONG-CHUL ,  OH JONG-EE ,  KWON DONG-SEUNG ,  AHN JEE-HWAN ,  HWANG SEUNG-KU

IPC: H04J11/00 ,  H04L20060101 ,  H04L

CPC classification number: H04L25/0232 ,  H04L25/0204 ,  H04L27/2647

Abstract: Disclosed is a time-varying channel estimation method in an OFDM which comprises: (a) generating a pilot symbol by a comb type method for inserting a pilot symbol into a specific subcarrier for each interval in each OFDM symbol; (b) transmitting the pilot symbol to a receiver from a transmitter through a time-varying channel by using at least two multiple transmit antennas; (c) receiving the pilot signal through the time-varying channel; and (d) estimating a first channel of from among the time-varying channel according to an interpolation method which uses a temporal correlation of a second channel and a third channel.

Abstract translation: 公开了一种OFDM中的时变信道估计方法，包括：（a）通过梳状方法生成导频符号，用于在每个OFDM符号中针对每个间隔将导频符号插入特定子载波; （b）通过使用至少两个多个发射天线通过时变信道从发射机向接收机发射导频符号; （c）通过时变信道接收导频信号; 以及（d）根据使用第二信道和第三信道的时间相关性的内插方法，估计时变信道中的第一信道。

公开(公告)号：WO2007114638A2

公开(公告)日：2007-10-11

申请号：PCT/KR2007001627

申请日：2007-04-03

Applicant: KOREA ELECTRONICS TELECOMM ,  KIM IL-GYU ,  PARK HYEONG-GEUN ,  CHANG KAP-SEOK ,  KO YOUNG-JO ,  YI HYO-SEOK ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN ,  HWANG SEUNG-KU

Inventor： KIM IL-GYU ,  PARK HYEONG-GEUN ,  CHANG KAP-SEOK ,  KO YOUNG-JO ,  YI HYO-SEOK ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN ,  HWANG SEUNG-KU

CPC classification number: H04L5/0053 ,  H04J11/0069 ,  H04L5/0016 ,  H04L27/2647 ,  H04W8/005 ,  H04W48/08 ,  H04W48/16 ,  H04W84/042 ,  H04W88/08

Abstract: A cell searching method in a time-division multiplexing (TDM)-based Orthogonal Frequency-Division Multiplexing (OFDM) cellular system having a primary synchronization channel and secondary synchronization channel, and a frame transmission method and system thereof are provided. In the cell searching method in an OFDM cellular system including a plurality of cells allocated with scrambling codes unique to the cells, wherein each base station transmits a frame of each cell and a terminal searches for a target cell by using the frame received from the base station, the cell searching method includes: acquiring Sync-block synchronization corresponding to a period of a primary synchronization channel symbol included in the frame received by the terminal and a primary synchronization channel sequence number by using the primary synchronization channel symbol; and acquiring a frame boundary of the frame and the target cell of the terminal based on the Sync-block synchronization and the primary synchronization channel sequence number by using a secondary synchronization channel symbol included in the frame received by the terminal. Accordingly, the synchronization can be acquired with low complexity.

Abstract translation: 提供了具有主同步信道和辅同步信道的基于时分复用（TDM）的正交频分复用（OFDM）蜂窝系统中的小区搜索方法及其帧传输方法和系统。 在包括分配有该小区唯一的扰码的多个小区的OFDM蜂窝系统的小区搜索方法中，每个基站发送每个小区的帧，终端通过使用从基站接收到的帧来搜索目标小区 小区搜索方法包括：通过使用主同步信道符号获取与由终端接收的帧中包括的主同步信道符号的周期相对应的同步块同步和主同步信道序列号; 以及通过使用由所述终端接收到的帧中包括的辅同步信道符号，基于所述同步块同步和所述主同步信道序列号，获取所述帧和所述终端的目标小区的帧边界。 因此，可以以低复杂度获取同步。

公开(公告)号：WO2005050887A3

公开(公告)日：2007-10-11

申请号：PCT/KR2004001958

申请日：2004-08-04

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  LEE YU-RO ,  KWON DONG-SEUNG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  LIM HYOUNG-SOO ,  CHO SEONG-CHUL ,  OH JONG-EE ,  HWANG SEUNG-KU ,  AHN JEE-HWAN ,  YOON SOON-YOUNG ,  SUNG SANG-HOON ,  CHO JAE-HEE ,  HWANG IN-SEOK ,  HUH HOON

Inventor： LEE YU-RO ,  KWON DONG-SEUNG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG ,  YEH CHOONG-IL ,  LIM HYOUNG-SOO ,  CHO SEONG-CHUL ,  OH JONG-EE ,  HWANG SEUNG-KU ,  AHN JEE-HWAN ,  YOON SOON-YOUNG ,  SUNG SANG-HOON ,  CHO JAE-HEE ,  HWANG IN-SEOK ,  HUH HOON

IPC: H04J11/00 ,  H04L27/26 ,  H04L20060101

CPC classification number: H04L5/023 ,  H04L25/023

Abstract: Disclosed is a method for configuring an uplink frame in an OFDMA based wireless communication system. The total band of the uplink frame is divided into a predetermined number of subcarrier groups. Subcarriers within the respective allocated subcarrier groups are allocated to the subchannel defined for a predetermined number of consecutive symbols defined by slots in the uplink frame. Pilot subcarriers are allocated by the unit of the predetermined number of symbols so as to allow channel estimation from among the allocated subcarriers. Accordingly, data subcarriers are allocated by minimizing collision with specific users of adjacent cells so as to enable channel estimation using preambles in a cellular system, and some positions of the data subcarriers are allocated for pilots, thereby allowing synchronous demodulation and improving frequency reuse rates.

Abstract translation: 公开了一种在基于OFDMA的无线通信系统中配置上行链路帧的方法。 将上行链路帧的总频带划分为预定数量的子载波组。 将分配的子载波组内的子载波分配给由上行链路帧中的时隙定义的预定数量的连续符号所定义的子信道。 导频子载波由预定数目的符号的单位分配，以便允许从所分配的子载波中进行信道估计。 因此，通过最小化与相邻小区的特定用户的冲突来分配数据子载波，以便能够使用蜂窝系统中的前同步码进行信道估计，并且为导频分配数据子载波的一些位置，从而允许同步解调和提高频率重用率。