公开(公告)号：DE112007002995B4

公开(公告)日：2014-11-20

申请号：DE112007002995

申请日：2007-10-30

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： JEONG BYUNG-JANG ,  CHUNG HYUN-KYU ,  NOH TAE-GYUN

IPC: H04J11/00

Abstract: Pilotsignal-Sender (200), der umfasst: eine digitale Fourier-Transformations-Einheit (213) für die digitale Fourier-Transformation eines Datensignals; einen Pilotsignal-Generator (220) zum Erzeugen eines Pilotsignals, das durch eine vorgegebene Lücke basierend auf einer vorgegebenen Phasenübergangsfolge in den Frequenzbereich überführt wird; einen Zeitmultiplexer (218) für die Zeitmultiplexierung des erzeugten Pilotsignals zusammen mit dem transformierten Datensignal und zum Senden eines resultierenden Signals über eine Antenne; und eine Symbol-Hilfsträger-Abbildungseinrichtung (214) zum Bestimmen eines Hilfsträgers zum Übertragen des erzeugten Pilotsignals zusammen mit dem Datensignal und zum Abbilden des Datensignals auf den bestimmten Hilfsträger.

公开(公告)号：DE112007002995T5

公开(公告)日：2009-10-08

申请号：DE112007002995

申请日：2007-10-30

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： JEONG BYUNG-JANG ,  CHUNG HYUN-KYU ,  NOH TAE-GYUN

IPC: H04J11/00

Abstract: Disclosed is a pilot signal transmitting/receiving device and method in a wireless communication system. When generating a pilot signal block that is shorter than the length of a data signal, a frequency for each predetermined pilot signal block is transitioned so as to guarantee frequency domain channel estimation performance. A cyclic prefix according to the length of the transitioned pilot signal is added to the pilot signal, a data signal is time division multiplexed together with the pilot signal, and a resultant signal is transmitted through an antenna. In advance to this, a position of a subcarrier for transmitting the pilot signal and the data signal is determined, a data signal is mapped on the determined subcarrier, and in this instance, diversity on the channel for a symbol is used to map the data signal on the transmission method using one of the localized FDMA (L-FDMA) channel and the distributed FDMA (D-FDMA) channel. Therefore, the frequency resolution in the frequency domain is maintained to thus provide high-quality channel estimation performance.

公开(公告)号：EP2501181A4

公开(公告)日：2013-05-29

申请号：EP10830121

申请日：2010-10-26

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KWON HYOUNG-JIN ,  JIN SUNG-GEUN ,  CHANG KAP-SEOK ,  KIM YONG-SUN ,  HONG SEUNG-EUN ,  LEE WOO-YONG ,  CHUNG HYUN-KYU

IPC: H04W40/06 ,  H04B7/06 ,  H04L12/911 ,  H04W40/24

CPC classification number: H04W40/246 ,  H04B7/155 ,  H04L41/12 ,  H04W24/10

Abstract: Provided is a communication method of a coordinator, the method including: receiving a relay search request frame for requesting a search for at least one relay station between a destination station and a source station; and transmitting, in response to the relay search request frame, a relay search response frame including a list of the at least one relay station so that the source station selects a target relay station from the at least one relay station.

公开(公告)号：EP2472966A4

公开(公告)日：2014-02-19

申请号：EP10812259

申请日：2010-08-25

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： CHANG KAPSEOK ,  JIN SUNGGEUN ,  CHUNG HYUN-KYU ,  LEE WOOYONG ,  KWON HYOUNGJIN

IPC: H04W56/00 ,  H04B7/26

CPC classification number: H04W56/005 ,  H04B7/15592 ,  H04W56/00 ,  H04W56/001 ,  H04W56/002 ,  H04W56/0045

Abstract: Disclosed is a technique related to a method for controlling synchronization by correcting data transmission time or frequency offset, and to a station. According to the technique, a method for controlling the synchronization of a first terminal for data transmission/reception in a coordinated communication system comprises: a step of transmitting a first request frame and a second request frame containing transmission time information for each of a first response frame and a second response frame to a second terminal and to a third terminal, respectively; a step of receiving the first response frame and the second response frame from the second terminal and the third terminal; a step of estimating a first propagation delay time between the first terminal and the second terminal and a second propagation delay time between the first terminal and the third terminal, using the time of receiving the first response frame and the second response frame; and a step of transmitting, to the second terminal, a third request frame containing information on the delay time difference between the first propagation delay time and the second propagation delay time.

公开(公告)号：EP2168256A4

公开(公告)日：2016-06-15

申请号：EP08766320

申请日：2008-06-13

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE HEESOO ,  CHUNG HYUN-KYU

IPC: H04B7/06 ,  H04B7/04 ,  H04J11/00

CPC classification number: H04B7/0452 ,  H04B7/0632 ,  H04B7/0647 ,  H04J11/004

Abstract: Provided are a method of controlling a multi-user multiple input multiple output (MIMO) system and a transmitter/receiver used in the method. In the method, it can be determined whether feedback information is fed back according to the feedback information type rather than being indiscriminately provided to a transmitter, and then only a necessary feedback information type is transmitted, thereby increasing system capacity while reducing feedback load.

公开(公告)号：EP2472810A4

公开(公告)日：2014-02-12

申请号：EP10812212

申请日：2010-08-23

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： CHANG KAPSEOK ,  LEE WOOYONG ,  CHUNG HYUN-KYU

IPC: H04L27/26

CPC classification number: H04L27/261 ,  H04L27/2613 ,  H04L27/2692 ,  H04W56/0085 ,  H04W72/04 ,  H04W84/12

Abstract: Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence.

公开(公告)号：EP2496029A4

公开(公告)日：2013-01-16

申请号：EP10827110

申请日：2010-10-28

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE IL-GU ,  LEE SOK-KYU ,  CHUNG HYUN-KYU ,  KIM DAE-SIK

IPC: H04W52/58 ,  H04W52/02 ,  H04W52/26

CPC classification number: H04W52/262 ,  H04B7/0626 ,  H04L1/1671 ,  H04W52/0216 ,  H04W52/0219 ,  H04W52/0229 ,  Y02B60/50 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/26

Abstract: The present invention relates to a method for increasing the resource utilization rate and reducing power consumption in a high-speed wireless communication system and a control device. The method according to one embodiment of the present invention comprises a process for efficient utilization of a frequency band by including channel state information and data frame mode information in a request frame or an ack frame, before transmission in a wireless communication system. The method according to one embodiment of the present invention relates to a power saving method in a wireless communication system having at least two different transmission modes, the method comprising: a process of setting a mode in such a manner that a control frame is received in a mode with the lowest sampling speed out of three different modes available and then receiving the control frame in the set mode; and a process of setting a mode, after receiving the control frame, in such a manner that a data packet is transmitted / received in a mode with the highest transmission rate and then transmitting / receiving the data packet in the set mode.