公开(公告)号：CA2605834A1

公开(公告)日：2006-11-02

申请号：CA2605834

申请日：2005-12-29

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM HEUNG-MOOK ,  SEO JAE-HYUN ,  KIM SEUNG-WON ,  LEE SOO-IN ,  EUM HO-MIN ,  PARK SUNG-IK ,  LEE YONG-TAE

IPC: H04B7/14

Abstract: Provided are an on-channel repeater and a method thereof. The on-channel repeater can extract reception channel information from signals transmitted from a main transmitter or another repeater, compensate for channel distortion caused on a transmission channel by inversely reflecting the extracted reception channel information to the received signals, and transmit the channel-distortion compensated signals through the same channel as a reception channel, and a method thereof. The on-channel repeater includes: a receiver for receiving RF signals transmitted from outside; a down-converter for down-converting the received RF signals into signals of a desired band; a channel-estimator for estimating an inverse value of a reception channel based on the down-converted signals; an adaptation filter for compensating for channel distortion by using a filter having the inverse value of the estimated reception channel; an up-converter for up-converting the channel distortion-compensated signals into RF signals; and a transmitter for transmitting the up-converted RF signals.

公开(公告)号：CA2464252A1

公开(公告)日：2005-04-29

申请号：CA2464252

申请日：2004-04-08

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM SEUNG-WON ,  SEO JAE-HYUN ,  LEE SOO-IN ,  LEE YONG-TAE ,  PARK SUNG-IK

IPC: H04N7/015 ,  H04B1/10 ,  H04H20/06 ,  H04L27/06 ,  H04L27/14 ,  H04N5/21 ,  H04N5/38 ,  H04N5/455 ,  H04H1/00

Abstract: Provided is a demodulation apparatus capable of reducing time delay of an on-channel repeater in a terrestrial digital television (TV) broadcasting system and a demodulation method thereof. The demodulation method includes the steps of a) converting an analogue intermediate frequency (IF) signal into a digital IF signal; b) generating an in-phase (I) signal and a quadrature (Q) signal by converting the frequency of the digital IF signals and down-converting the frequencies of the pilot components of the I and Q signals so that the center frequencies of the I and Q signals could be shifted to 0; c) filtering the down-converted I and Q signals and maximizing signal-to-noise -ratio; d) up-converting the filtered I and Q signals into baseband signals in which the center frequencies of the filtered I and Q signals are placed in baseband and shifting the frequency of the pilot components of the filtered I and Q signals to 0; and e) adding up the up-converted I and Q signals to restore the signals into baseband signals for broadcasting.

公开(公告)号：CA2605834C

公开(公告)日：2012-02-14

申请号：CA2605834

申请日：2005-12-29

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK SUNG-IK ,  LEE YONG-TAE ,  EUM HO-MIN ,  KIM HEUNG-MOOK ,  SEO JAE-HYUN ,  KIM SEUNG-WON ,  LEE SOO-IN

IPC: H04B7/14

Abstract: Provided are an on-channel repeater and a method thereof. The on-channel repeater can extract reception channel information from signals transmitted from a main transmitter or another repeater, compensate for channel distortion caused on a transmission channel by inversely reflecting the extracted reception channel information to the received signals, and transmit the channel-distortion compensated signals through the same channel as a reception channel, and a method thereof. The on-channel repeater includes: a receiver for receiving RF signals transmitted from outside; a down-converter for down-converting the received RF signals into signals of a desired band; a channel-estimator for estimating an inverse value of a reception channel based on the down- converted signals; an adaptation filter for compensating for channel distortion by using a filter having the inverse value of the estimated reception channel; an up- converter for up-converting the channel distortion-compensated signals into RF signals; and a transmitter for transmitting the up-converted RF signals.

公开(公告)号：MX2009005722A

公开(公告)日：2009-06-08

申请号：MX2009005722

申请日：2007-11-30

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK SUNG-IK ,  LEE YONG-TAE ,  KIM HEUNG-MOOK ,  EUM HO-MIN ,  LEE SOO-IN ,  LEE JAE-YOUNG ,  SEO JAE-HYUN ,  LIM JONG-SOO

IPC: H04L25/20

Abstract: Se proporciona un repetidor distribuido para repetir señales de salida idénticas a las señales de entrada a través de un canal diferente al de las señales de transmisión principales, pero idéntico a los canales de otros repetidores distribuidos y un método de repetición distribuida del mismo. El repetidor distribuido incluye: Una unidad de pre-procesamiento configurada para recibir una señal de radiofrecuencia (RF) transmitida desde de un dispositivo externo y desmodular la señal de RF en una señal de banda base; un ecualizador configurado para ecualizar la señal de banda base para corregir una distorsión que ocurre en un canal de transmisión; una unidad de inserción y generación de señal de identificación configurada para generar una señal de identificación para identificación del repetidor distribuido y acondicionamiento de red e insertar la señal de identificación en la señal de banda base ecualizada; y una unidad de post-procesamiento configurado para convertir la señal de banda base de la unidad de inserción y generación de señal de identificación en una señal de RF y enviar la señal de RF.

公开(公告)号：CA2686925A1

公开(公告)日：2008-11-20

申请号：CA2686925

申请日：2007-11-09

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： SEO JAE-HYUN ,  EUM HO-MIN ,  PARK SUNG-IK ,  LEE SOO-IN ,  KIM HEUNG-MOOK ,  LIM JONG-SOO ,  LEE JAE-YOUNG ,  LEE YONG-TAE

IPC: H04B7/14

Abstract: Provided is an on-channel repeater, which removes feedback signals caused due to low isolation of transmission/reception antennas and a method thereo f. The on-channel repeater includes : a receiver for receiving radio frequen cy (RF) signals and converting them into baseband signals; a subtractor for subtracting replicas of feedback signals from the baseband signals to thereb y produce signals whose feedback signals are primarily removed; a demodulato r for demodulating the signals which include the remaining feedback signals; an equalizer for equalizing the demodulated signals to thereby produce equa lized signals; a transmitter for modulating the equalized signals to thereby produce modulated signals, converting the modulated signals into RF signals , and transmitting the RF signals in the air; a down-converter for down-conv erting the RF signals into baseband signals; and a replica generator for cal culating the replicas based on the baseband signals of the down- converter a nd the signals without feedback signals of the subtractor, and feeding back them to the subtractor.

公开(公告)号：CA2454295C

公开(公告)日：2007-05-15

申请号：CA2454295

申请日：2003-12-29

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE SOO-IN ,  PARK SUNG-IK ,  LEE YONG-TAE ,  KIM SEUNG-WON ,  EUM HO-MIN ,  SEO JAE-HYUN

IPC: H04N7/015 ,  H04B7/005 ,  H04H20/00 ,  H04H20/06 ,  H04N5/21 ,  H04N5/40 ,  H04N5/44 ,  H04N5/455

Abstract: A repeater and method for an ATSC terrestrial digital TV broadcasting service. The on-channel repeater includes: a receiving unit for receiving a Radio Frequency (RF) broadcast signal from a main transmitter; a frequency downlink converting unit for converting the received RF broadcast signal into an intermediate frequency (IF) signal; a demodulating unit for converting the converted IF signal into a baseband signal; an equalizing unit for removing noise and multi-path signals generated from the converted baseband signal; a modulating unit for converting the baseband signal into an IF signal; a frequency uplink converting unit for converting the IF signal into a RF broadcast signal; a high power amplifying unit for amplifying and repeating the converted RF broadcast signal; a transmitting unit for transmitting the RF broadcast signal outputted from the high power amplifying unit; and a signal synchronizing unit for generating the first reference frequency, and generating the second reference frequency based on the first reference frequency such that the transmission/reception signal are frequency-and-phase synchronized.

公开(公告)号：CA2553753A1

公开(公告)日：2005-07-28

申请号：CA2553753

申请日：2004-12-31

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： SEO JAE-HYUN ,  KIM HEUNG-MOOK ,  KIM SEUNG-WON ,  LEE SOO-IN ,  EUM HO-MIN ,  LEE YONG-TAE ,  PARK SUNG-IK

IPC: H04N7/015 ,  H04B7/155 ,  H04N5/40

Abstract: Provided is a modulating apparatus and method of an on-channel repeater. An object of the present invention is to provide a modulating apparatus of an o n- channel repeater for reducing time delay by configuring and up-sampling a baseband signal, filtering the up-sampled baseband signal with an Equi-Rippl e (ER) filter or in a window method, and converting the filtered baseband sign al into an RF signal. The modulating apparatus includes: a baseband signal configuring unit for configuring a baseband. signal by combining an input field and a segment sync signal; a pilot adding unit for adding a pilot sign al to the baseband signal; a filtering unit for filtering the baseband signal with the pilot signal; and an RF up-converting unit for up-converting the filtered signal into an RF signal. The present invention is used to form an on- channel repeating network in a transmitting system including a digital TV broadcasting system.

公开(公告)号：CA2668058C

公开(公告)日：2016-03-29

申请号：CA2668058

申请日：2007-10-12

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK SUNG-IK ,  LEE JAE-YOUNG ,  SEO JAE-HYUN ,  EUM HO-MIN ,  KIM HEUNG-MOOK ,  LIM JONG-SOO ,  LEE SOO-IN

IPC: H04B7/14

Abstract: Provided is an apparatus and method for analyzing identification (ID) signals by converting radio frequency (RF) signals which are transmitted with an ID signal added thereto by a transmitting part, e.g., a plurality of transmitters or repeaters, into signals of a desired band; creating ID signals that are identical to the ID signals added to the RF signals; calculating correlation values between the converted signals and the created ID signals based on partial correlation; and extracting channel profile of multi-path signals caused by a channel between the transmitting part and the ID signal analyzing apparatus from the correlation value. The technology of the present research is applied to broadcasting and communication.

公开(公告)号：MXPA06008226A

公开(公告)日：2007-04-16

申请号：MXPA06008226

申请日：2004-12-31

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE YONG-TAE ,  KIM SEUNG-WON ,  EUM HO-MIN ,  SEO JAE-HYUN ,  LEE SOO-IN ,  PARK SUNG-IK ,  KIM HEUNG-MOOK

IPC: H04N7/00 ,  H04N7/015 ,  H04B7/155 ,  H04N5/40

Abstract: Se proporcionan un aparato y metodo de modulacion de un repetidor en canal. Un objeto de la presente invencion es proporcionar un aparato de modulacion de un repetidor en canal para reducir el retardo de tiempo al configurar y muestrear ascendentemente una senal de banda base, filtrar la senal de banda base muestreada ascendentemente con un filtro de Equi-Ondulacion (ER) o en un metodo de ventana, y convertir la senal de banda base filtrada en una senal de RF. El aparato de modulacion incluye: una unidad de configuracion de senal de banda base para configurar una senal de banda base al configurar un campo de entrada y una senal de sincronizacion de segmento; una unidad de adicion de piloto para agregar una senal piloto a la senal de banda base; una unidad de filtracion para filtrar la senal de banda base con la senal piloto; y una unidad de conversion ascendente de RF para convertir ascendentemente la senal filtrada en una senal de RF. La presente invencion se utiliza para formar una red de repeticion en canal en un sistema de transmision que incluye un sistema de difusion de TV digital.

公开(公告)号：MXPA05012578A

公开(公告)日：2007-03-08

申请号：MXPA05012578

申请日：2003-12-27

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM SEUNG-WON ,  PARK SUNG-IK ,  LEE YONG-TAE ,  EUM HO-MIN ,  SEO JAE-HYUN ,  LEE SOO-IN

IPC: H04N7/015 ,  H04H20/00 ,  H04H20/06 ,  H04N5/21 ,  H04N5/40 ,  H04N5/44 ,  H04N5/455

Abstract: Se describe un repetidor y metodo para un servicio de servicio de difusion de TV digital terrestre de ATSC. El repetidor de canal activo incluye: una unidad de recepcion para recibir una senal de difusion de Radiofrecuencia (FR) desde un trasmisor principal; una unidad de conversion de enlace descendente de frecuencia para convertir la senal de difusion de RF recibida en una senal de frecuencia intermedia (IF); una unidad de desmodulacion para convertir la senal de IF convertida en una senal de banda base; una unidad de ecualizacion para remover una cierta senal innecesaria generada a partir de la senal de banda base convertida; una unidad de modulacion para convertir la senal de banda base en una senal de IF; una unidad de conversion de enlace ascendente de frecuencia para convertir la senal de IF en una senal de difusion de RF; una unidad de amplificacion de alta potencia para amplificar y repetir la senal de difusion de RF convertida; una unidad de transmision para transmitir la senal de difusion de RF producida de la unidad de amplificacion de alta potencia; y una unidad de sincronizacion de senal para generar la primera frecuencia de referencia, y generar la segunda frecuencia de referencia en la base de la primera frecuencia de referencia de manera que la senal de transmision/recepcion se sincronizan por frecuencia y fase.