Abstract:
The present invention provides a method for modifying the surface of carbon black and a display device including the carbon black. The display device includes: an upper electrode; a lower electrode which is separated from and faces the upper electrode; and a pigment which is filled in a space between the upper electrode and the lower electrode and includes a plurality of microcapsules. Each of the microcapsules contains carbon blacks of which surfaces are modified to be hydrophobic.
Abstract:
An apparatus and a method for equalizing the reception channel in an OFDM(Orthogonal Frequency Division Multiplexing) transmission system and a DMB(Digital Multimedia Broadcasting) receiving apparatus applying the same are provided to improve the performance of mobile reception in a transmission system in which pilot signal is not used. A channel estimator(520) estimates channel as a symbol unit with the reference signal received from the standard signal creation part(550). A channel filtering part(530) removes the noises of the presumed channel value. A channel equalization part(540) equalizes the channel by using the estimation channel value. The channel estimator estimates the PRS(Phase Reference Symbol) of the received frame by the reference signal.
Abstract:
An apparatus and a method for receiving a signal in a digital broadcasting system are provided to improve a reception rate of a signal by applying a diversity method. A plurality of symbol estimation modules(210) receives a plurality of frequency multiplexing signals and outputs a first hierarchical estimation symbol row and a plurality of second hierarchical estimation symbol rows. A signal processor(220) diversity-signal-processes the plurality of second hierarchical estimation symbol rows and outputs the diversity signal. A first hierarchical symbol demapping unit(230) demaps the first hierarchical estimation symbol row and outputs the first hierarchical estimation demapping signal. A second hierarchical symbol demapping unit(240) demaps the diversity signal and outputs the second hierarchical symbol demapping signal. A first hierarchical decoder(250) channel-decodes the first hierarchical symbol demapping signal and outputs the first hierarchical decoding signal. A second hierarchical decoder(260) channel-decodes the second hierarchical symbol demapping signal and outputs the second hierarchical decoding signal.
Abstract:
A receiving apparatus and a synchronization detecting method for detecting synchronization more accurately are provided to detect starting point of sampling and a starting point of a frame by using receiving signal corresponding to a sampling interval and a phase reference signal. A signal detection unit(110) detects the null signal and phase reference signal from the received signal. A synchronization detector(120) detects the first start time point of frame by using the null signal. A plurality of first delay taps corresponding to a plurality of coefficient of correlations determined by the phase reference signal and the second delay tap corresponding to the sampling period ringed with over sample are used. The second start time point of frame is detected from the first start time point.
Abstract:
본 발명은 지상파 디지털 멀티미디어방송 송신장치의 계층 변조 방법에 관한 것으로써, 지상파 디지털 멀티미디어 방송 송신 장치에서 기존 지상파 DMB 서비스를 위하여 전송되는HP(High Priority)신호인 제1 디지털 신호를 수신하여 디지털 맵핑하는 제1 QPSK 맵핑부, 고품질/고전송 효율 서비스를 위하여 HP 신호와 함께 전송되는 LP(Low Priority)인 제2 디지털 신호를 수신하여 디지털 맵핑하는 제2 QPSK 맵핑부, 상기 QPSK 맵핑된 제1 디지털 신호 및 제2 디지털 신호를 더하여 주파수 인터리빙하는 주파수 인터리버 및 상기 주파수 인터리빙된 디지털 신호를 다시 디지털 맵핑하는 DQPSK 맵핑부를 포함하는 지상파 DMB 계층적 변조 장치를 제공한다. 지상파 DMB, 계층적 변조
Abstract:
본 발명은 이동통신 시스템에서 주파수 옵셋 추정 방법 및 장치에 관한 것이다. 본 발명은 수신 신호에 포함된 기준 심볼의 보호 구간 중 일부에 해당하는 제1 블록의 신호와 상기 수신 신호를 상관하여 제1 상관값을 계산하고, 상기 보호 구간 중 일부에 해당하는 제2 블록의 신호와 상기 수신 신호를 상관하여 제2 상관값을 계산한 후, 상기 제1 상관값을 시간 지연시키고, 상기 지연시킨 제1 상관값의 켤레 복소수와 상기 제2 상관값을 곱하고, 상기 곱한 값의 위상값을 상기 제1 블록과 상기 제2 블록의 시간 간격으로 나누어 주파수 옵셋을 추정한다. OFDM, 지상파 DMB, 주파수 옵셋 추정, 동기
Abstract:
A hierarchical modulation apparatus for improving a transmission performance of an OFDM transmission system using the insertion and the specific arrangement pattern of a pilot, and a method thereof are provided to improve a receiving performance by additionally transmitting a pilot signal to an enhancement layer signal. A hierarchical modulation apparatus for improving a transmission performance of an OFDM transmission system using the insertion and the specific arrangement pattern of a pilot includes a first channel coding unit(200), a second channel coding unit(210), a pilot insertion unit(220), and a layer modulation unit(240). The first channel coding unit encodes a base layer signal column. The second channel coding unit encodes an enhancement signal column. The pilot insertion unit inserts a pilot into the enhancement signal column. The pilot has the correlation with the base layer signal column corresponding to the same sub carrier with the enhancement layer signal column which is encoded in the second channel coding unit. The layer modulation unit modulates and combines each of the signal columns outputted from the first channel coding unit and the pilot insertion unit.