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。

公开(公告)号：WO2008038878A2

公开(公告)日：2008-04-03

申请号：PCT/KR2007002383

申请日：2007-05-15

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KWON DONG-SEUNG ,  CHOI IN-KYEONG ,  KU HYONG-WOO ,  KANG JI-WON ,  LEE CHUNG-YONG

Inventor： KWON DONG-SEUNG ,  CHOI IN-KYEONG ,  KU HYONG-WOO ,  KANG JI-WON ,  LEE CHUNG-YONG

IPC: H04L25/03 ,  H04B7/005

CPC classification number: H04L25/497 ,  H04L25/03006 ,  H04L25/03343 ,  H04L27/3405 ,  H04L2025/03426 ,  H04L2025/03605

Abstract: The present invention relates to a precoder and a precoding method in a multi-user multi-antenna communication system. When a transmission part having a plurality of antennas transmits a plurality of signals to a receiving part having an antenna, the precoder and the precoding method using the same prevents system performance degradation caused by interference signals and efficiently reduces transmission power while changing the constellation rotary angle. When the power is controlled by using the precoder, the system performance is enhanced while not damaging the structural gain of the existing multi-user multi-antenna precoder.

Abstract translation: 本发明涉及多用户多天线通信系统中的预编码器和预编码方法。 当具有多个天线的发送部分将多个信号发送到具有天线的接收部分时，预编码器和使用其的预编码方法防止由干扰信号引起的系统性能下降，并且在改变星座旋转角度的同时有效地降低发射功率 。 当通过使用预编码器来控制功率时，系统性能得到提高，同时不损害现有的多用户多天线预编码器的结构增益。

公开(公告)号：DE102011004579A1

公开(公告)日：2012-05-10

申请号：DE102011004579

申请日：2011-02-23

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE IL-GU ,  CHOI IN-KYEONG ,  OH JONG-EE ,  CHOI EUN-YOUNG ,  LEE SOK-KYU ,  LEE YU-RO

IPC: H04W92/10 ,  H04W88/06 ,  H04W88/08

Abstract: Ein Verfahren zum Senden von Daten durch ein Sendeendgerät zu einem Empfangsendgerät in einem drahtlosen Kommunikationssystem enthält: Erzeugen eines ersten Erfassungsfelds, das Symbole enthält, die unter Verwendung eines BPSK-Datentons moduliert werden; Erzeugen eines zweiten Erfassungsfelds, das Symbole enthält, die in der Weise moduliert werden, dass ein geradzahliger Hilfsträger und ein ungeradzahliger Hilfsträger eine Phasendifferenz von 90 Grad besitzen; Erzeugen eines Datenpakets, das das erste Erfassungsfeld, das zweite Erfassungsfeld und die Daten enthält; und Senden des Datenpakets.

公开(公告)号：WO2009035284A3

公开(公告)日：2009-05-22

申请号：PCT/KR2008005397

申请日：2008-09-11

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  CHOI IN-KYEONG ,  KWON DONG SEUNG ,  KANG JI WON ,  LEE CHUNG YONG

Inventor： CHOI IN-KYEONG ,  KWON DONG SEUNG ,  KANG JI WON ,  LEE CHUNG YONG

IPC: H04B7/02

CPC classification number: H04B7/0617

Abstract: The present invention relates to a beamforming method and apparatus. A beamforming method for use in a base station for transmitting a plurality of streams through a plurality of antennas includes: receiving feedback information including information on a first codeword selected from a codebook including a plurality of codewords from each of a plurality of user terminals; grouping the plurality of user terminals by use of the feedback information from each user terminal; determining a user terminal to which a plurality of streams will be assigned of the plurality of user terminals, and determining a second codeword to be used for beamforming from the codebook by use of the feedback information of each user terminal and grouping information; and multiplying data to be transmitted through the plurality of steams by the second codeword and a unitary matrix.

Abstract translation: 波束形成方法和装置技术领域本发明涉及波束形成方法和装置 一种用于在基站中用于通过多个天线发送多个流的波束成形方法，包括：接收包括关于从包括来自多个用户终端中的每一个的多个码字的码本中选择的第一码字的信息的反馈信息; 通过使用来自每个用户终端的反馈信息来分组多个用户终端; 确定多个用户终端将被分配多个流的用户终端，并且通过使用每个用户终端的反馈信息和分组信息来确定要从码本中用于波束成形的第二码字; 以及将要通过所述多个流传送的数据乘以所述第二码字和酉矩阵。

公开(公告)号：WO2006062381A3

公开(公告)日：2008-08-21

申请号：PCT/KR2005004230

申请日：2005-12-09

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  LEE SEUNG-JOON ,  KWON DONG-SEUNG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG

Inventor： LEE SEUNG-JOON ,  KWON DONG-SEUNG ,  KIM SEONG-RAG ,  CHOI IN-KYEONG

IPC: H04J11/00

CPC classification number: H04L1/0643 ,  H04B7/0669 ,  H04B7/0891 ,  H04L1/0631

Abstract: A receiver according to an exemplary embodiment of the present invention receives a transmitted signal, converts the signal to a predetermined symbol, and estimates channel information including a channel gain of a channel of the transmitted signal. In addition, the receiver generates an intermediate processing value for decoding the signal based on the estimated channel information and the symbol, and normalizes the intermediate processing value to the channel gain to generate a reference value. The generated reference value is used for a soft-decision value for decoding the signal. In addition, when the signal is decoded by using a hard-decision value, a constellation point value that is closest to the reference values is generated and set as the hard-decision value.

Abstract translation: 根据本发明的示例性实施例的接收机接收发送信号，将该信号转换成预定符号，并且估计包括发送信号的信道的信道增益的信道信息。 此外，接收器基于估计的信道信息和符号生成用于对信号进行解码的中间处理值，并且将中间处理值归一化为信道增益以生成参考值。 生成的参考值用于解码信号的软判决值。 此外，当通过使用硬判决值来解码信号时，生成最接近参考值的星座点值并将其设置为硬判定值。

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：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：WO2005062729A2

公开(公告)日：2005-07-14

申请号：PCT/KR2004003065

申请日：2004-11-25

Applicant: KOREA ELECTRONICS TELECOMM ,  CHOI IN-KYEONG ,  KIM SEONG-RAG ,  KWON DONG-SEUNG ,  CHOI JIN-HO

Inventor： CHOI IN-KYEONG ,  KIM SEONG-RAG ,  KWON DONG-SEUNG ,  CHOI JIN-HO

IPC: H04B7/04 ,  H04J99/00 ,  H04L1/06 ,  H04L25/03

CPC classification number: H04L27/2626 ,  H04B7/0417 ,  H04B7/0634 ,  H04B7/065 ,  H04B7/066 ,  H04L1/06 ,  H04L1/0693 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: Disclosed is a MIMO-OFDM system, wherein the transmitter comprises a serial/parallel converter for converting continuouslyinputted symbols of the number of subcarriers to K parallel signals; a signal reproducer for reproducing K parallel signals by the number of transmit antennas L an eigenmode generator for generating eigenbeam of the reproduced signals outputted from the signal reproducer at each subcarrier, on the basis of Nf eigenbeam forming vectors which are fed backlong-term and information of a best eigenbeam forming vector at each subcarrier which is fed back short-term, through the feedback device; and aplurality of inverse Fourier converters for receiving the signals outputted from the eigenmode generator and generating an OFDM symbol.

Abstract translation: 公开了一种MIMO-OFDM系统，其中发射机包括串行/并行转换器，用于将子载波数量的连续输入符号转换为K个并行信号; 信号再现器，用于根据发送天线L的数量再现K个并行信号，本发明天线L是一个本征模式发生器，用于根据在每个子载波上从信号再现器输出的再生信号产生本征光束， 通过反馈装置在短时间反馈的每个子载波处的最佳特征波束形成矢量; 以及多个逆傅里叶变换器，用于接收从本征模式发生器输出的信号并产生OFDM符号。

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：EP1815613A4

公开(公告)日：2012-03-07

申请号：EP05774149

申请日：2005-08-10

Applicant: KOREA ELECTRONICS TELECOMM ,  UNIV YONSEI IACF

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