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：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：BRPI0416673A

公开(公告)日：2007-02-13

申请号：BRPI0416673

申请日：2004-03-27

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK SUNG-IK ,  KIM SEUNG-WON ,  KIM HYOUNG-NAM

IPC: H04N7/015 ,  H03M13/25 ,  H04L1/00 ,  H04L25/03 ,  H04L27/02 ,  H04N5/21 ,  H04N5/44

Abstract: A decision feedback equalizing apparatus and a method of decision feedback equalization make a channel property of an inferior receiving signal to mild by using a channel-matched filter and decrease decision errors of symbol detector output signals by using a trellis decoder with decreased complexity, whose trace back depth is 1 (TBD=1).

公开(公告)号：CA2614866A1

公开(公告)日：2007-01-18

申请号：CA2614866

申请日：2006-07-11

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： LEE HO-KYOUNG ,  KIM SUNG-HOON ,  AHN CHIETEUK ,  LEE SOO-IN ,  LEE JAE-YOUNG ,  KIM CHANG-JOONG ,  KIM SEUNG-WON

IPC: H04N7/24

Abstract: Provided is a method for searching for an optimal coder suitable to a dual stream transmission method of a DTV transceiving apparatus, and an encoder and a decoder employing the optimal coder searching method. The optimal coder searching method includes the steps of: a) determining a mixed pattern of normal stream and robust stream; b) determining a trellis structure of the robust stream which is applied to the mixed pattern based on how coders are connected; c) forming a dual stream trellis by mixing a trellis of the normal stream, which is a normal stream trellis, and a trellis of the robust stream, which is a robust stream trellis; d) computing a free distance at departing points of the dual stream trellis structure based on a dual stream free distance computation termination condition; and e) determining the optimal coder based on the free distance.

公开(公告)号：CA2579502A1

公开(公告)日：2006-03-23

申请号：CA2579502

申请日：2005-09-15

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： AHN CHIETEUK ,  KIM SUNG-HOON ,  JI KUM-RAN ,  LEE JAE-YOUNG ,  LEE SOO-IN ,  KIM SEUNG-WON

IPC: H04N7/12 ,  H04N5/00 ,  H04N7/24

Abstract: Provided is a Vestigial Side Band Digital Television (DTV) transmitter/receiver based on Advanced Television System Committee A/53. The invention provides DTV transmitter/receiver having a dual stream structure through generation of robust data which has a transmission rate a fourth as fast as that of normal data, and a method thereof. The DTV transmitter includes: input means for receiving digital video data stream including normal and robust data; encoding means for performing ¼ rate coding on the digital video data stream so that one bit can be transmitted through two symbols; and transmitting means for modulating/transmitting output signals of the encoding means. This invention can reduce SNR and satisfy TOV of robust data by performing additional FEC on robust data, transmitting/receiving ¼ rate coded robust data, which are capable of transmitting one-bit data for two symbols, and improving decoding ability of an equalizer and a trellis decoder of a DTV receiver.

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：AU2003285812A1

公开(公告)日：2004-12-13

申请号：AU2003285812

申请日：2003-12-27

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04N7/015 ,  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：CA2516249C

公开(公告)日：2013-02-05

申请号：CA2516249

申请日：2004-02-11

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK SUNG-IK ,  KIM HYOUNG-NAM ,  KIM SEUNG-WON ,  AHN CHIETEUK

IPC: H04N7/015 ,  H03M13/25 ,  H04L1/00 ,  H04L25/03

Abstract: The conventional decision feedback equalizer has a drawback that can't decide symbols correctly because a simple slicer is used as a symbol detector. A decision feedback equalizer as a symbol detector uses a Trellis Coded Modulation (TCM) decoder whose Trace Back depth is 1 (TBD=1), to thereby decide symbols correctly without decoding delay.

公开(公告)号：CA2543646C

公开(公告)日：2012-12-18

申请号：CA2543646

申请日：2004-10-29

Applicant: KOREA ELECTRONICS TELECOMM

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

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

Abstract: Provided is an on-channel repeater and method thereof. The on-channel repeating apparatus includes: a receiving unit for receiving a Radio Frequency (RF) broadcast signal; a demodulating unit for converting the RF signal into a baseband signal; an equalizing unit for equalizing the baseband signal to generate an equalized baseband signal; a modulating unit for converting the equalized baseband signal into an RF signal; and a transmitting unit for transmitting the RF signal.

公开(公告)号：CA2465014C

公开(公告)日：2009-01-06

申请号：CA2465014

申请日：2004-04-19

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04N5/40 ,  H04N7/015 ,  H04B17/40 ,  H04H20/72 ,  H04L27/12 ,  H04N7/24

Abstract: Provided is a modulation apparatus that can reduce time delay of on-channel repeaters in a terrestrial digital television broadcasting system. The time delay is caused by a filter during the modulation operation in the on-channel repeaters. The modulation apparatus of the present research includes: a baseband signal forming unit for forming a baseband signal by combining the output signals of an equalization unit with the pre-defined field/segment synchronization signals in the on-channel repeaters; a pilot inserting unit for inserting a pilot signal to the baseband signal; an up-sampling unit for up-sampling the baseband signal with the pilot signal; a VSB filtering unit for filtering the up-sampled baseband signal based on a Window technique and/or an Equi-Ripple filter to thereby form an in- phase (I) signal and a quadrature (Q) signal; an up-converting unit for up-converting the frequencies of the filtered I and Q signals to frequencies of an intermediate frequency (IF) band; an adding unit for adding the up-converted L and Q signals and converting a resultant signal into a digital VSB signal of the IF band; and a digital-to-analogue converting unit for converting the digital signal of the IF band to an analogue signal.