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    • 35. 发明公开
    • 방송 신호의 전송 방법과 장치
    • 数字广播信号的传输方法,装置和记录介质及其接收装置
    • KR1020090042763A
    • 2009-04-30
    • KR1020090002405
    • 2009-01-12
    • 한국전자통신연구원
    • 서재현임형수김흥묵이용태박성익임종수이수인
    • H04N21/43H04N7/015
    • H03M1/662H03M2201/173H03M2201/30H04H20/65H04N21/435
    • A transmission method and a device, and a recording medium and a receiving device of digital broadcasting signal are provided to offer different transmission modes for frequency domain and time domain respectively. An allocation unit assigns more than one sub-band and more than one symbol to a modulated service data which is outputted from M digital modulator(S430). An IFFT(Inverse Fast Fourier Transform) converts a signal of a frequency domain to a signal of the time domain about the M service data outputted from the sub-band allocation unit(S440). A frame generator generates a plurality of symbol durations into a frame body of one transfer frame(S450). The frame generator generates a frame header which includes the information about each of M services(S460). A D/A converter converts a transfer frame of a digital signal outputted from the frame generator into an analog signal(S470). The D/A converter transmits the transfer frame converted into an analog signal to a receiving device.
    • 提供传输方法和装置,以及数字广播信号的记录介质和接收装置,以分别为频域和时域提供不同的传输模式。 分配单元向从M数字调制器输出的调制业务数据分配多于一个子带和多于一个符号(S430)。 IFFT(逆快速傅里叶变换)将频域的信号转换为关于从子带分配单元输出的M服务数据的时域的信号(S440)。 帧生成器将多个符号持续时间生成到一个传送帧的帧体中(S450)。 帧生成器生成包括关于每个M服务的信息的帧头(S460)。 D / A转换器将从帧发生器输出的数字信号的传送帧转换为模拟信号(S470)。 D / A转换器将转换成模拟信号的传送帧发送到接收设备。
    • 37. 发明公开
    • 전송 시스템에서의 복조 장치 및 방법
    • 传输系统解调装置及方法
    • KR1020090014741A
    • 2009-02-11
    • KR1020070078919
    • 2007-08-07
    • 한국전자통신연구원
    • 서재현김영수양규태김주연최서미배재휘이광순윤정일김광용김흥묵임종수이수인
    • H04L27/26H04L27/18
    • H04L27/2604H04L25/0224H04L27/2649
    • An apparatus and a method for demodulation in a transmission system are provided to improve reception of an addition layer by using a pilot existing in an addition layer signal. A receiver(210) receives the signal in the form of a transfer frame and the signal comprises a phase reference symbol, a fast information channel and a main service channel. A pilot information storage unit(230) stores location information of a pilot included in the main service channel. A primary channel estimating unit(244) channel-estimates the phase reference symbol and outputs a primary channel estimated value. According to the channel estimated value of the phase reference symbol, the second channel estimating unit(245) channel-estimates the fast information channel and outputs the second channel estimated value. According to the channel estimated value on the basis of the location information of the pilot the fast information channel, a third channel estimating unit(246) channel-estimates the main service channel and outputs the third channel estimated value. According to the primary channel estimated value, the second channel estimated value and the third channel estimated value, a channel equalization part(247) channel-equalizes the signal and outputs a channel-equalized signal.
    • 提供一种用于在传输系统中进行解调的装置和方法,以通过使用存在于加法层信号中的导频来改善加法层的接收。 接收机(210)以传送帧的形式接收信号,该信号包括相位参考符号,快速信息信道和主服务信道。 导频信息存储单元(230)存储主服务信道中包含的导频的位置信息。 主信道估计单元(244)信道估计相位参考符号并输出主信道估计值。 根据相位参考符号的信道估计值,第二信道估计单元(245)对快速信息信道进行信道估计,并输出第二信道估计值。 根据基于导频的快速信息信道的位置信息的信道估计值,第三信道估计单元(246)对主服务信道进行信道估计,并输出第三信道估计值。 根据主信道估计值,第二信道估计值和第三信道估计值,信道均衡部分(247)对信号进行信道均衡并输出信道均衡信号。
    • 38. 发明公开
    • 계층 변조 장치 및 방법
    • 用于分层调制的装置和方法
    • KR1020090008852A
    • 2009-01-22
    • KR1020070072151
    • 2007-07-19
    • 한국전자통신연구원
    • 서재현김흥묵김주연최서미김광용윤정일이광순배재휘양규태김영수임종수이수인안치득
    • H04L27/26
    • H04L27/2604H03M13/1102H03M13/23H03M13/2957H03M13/356H04L27/261
    • An apparatus and a method for hierarchical modulation are provided to improve reception performance without affecting a basic layer by inserting a pilot into an additional layer. A basic hierarchical channel encoder(110) generates a basic layer symbol string by encoding the basic layer signal string. A basic hierarchical modulation unit of a hierarchical modulation unit(150) generates the basic hierarchical modulation symbol string by modulating the base hierarchical symbol string. An additional hierarchical channel encoder(120) generates the additional hierarchical symbol string by encoding the additional hierarchical signal string. A pilot insertion unit(130) generates a pilot insertion symbol string by inserting the pilot to the addition hierarchical symbol string. The additional hierarchical modulation unit of the hierarchical modulation unit generates the additional hierarchical modulation symbol string by modulating the pilot insertion symbol string. The symbol mapping unit generates the hierarchical modulation signal by mapping the basic hierarchical modulation symbol string and the additional hierarchical symbol string to a signal space. A normalization unit normalizes the hierarchical modulation signal and generates the normalized hierarchical modulation signal.
    • 提供了用于分级调制的装置和方法,以通过将导频插入附加层来改善接收性能而不影响基本层。 基本层级信道编码器(110)通过对基本层信号串进行编码来生成基本层符号串。 分级调制单元(150)的基本分级调制单元通过调制基本分层符号串来生成基本分级调制符号串。 附加分层信道编码器(120)通过对附加分层信号串进行编码来生成附加分层符号串。 导频插入单元(130)通过将导频插入加法分级符号串来生成导频插入符号串。 分级调制单元的附加分层调制单元通过调制导频插入符号串来产生附加分层调制符号串。 符号映射单元通过将基本分层调制符号串和附加分层符号串映射到信号空间来生成分层调制信号。 归一化单元对分级调制信号进行归一化,并生成归一化分级调制信号。
    • 40. 发明授权
    • 디지털 멀티미디어 방송망에 따른 방송신호 수신장치 및 수신 방법
    • 디지털멀티미디어방송망에따른방송신호수신장치및수신방
    • KR100874266B1
    • 2008-12-16
    • KR1020070039226
    • 2007-04-23
    • 한국전자통신연구원
    • 서재현김영수양규태김주연최서미배재휘이광순윤정일김광용김흥묵임종수이수인
    • H04L27/26H04B1/16
    • A method and an apparatus for receiving a broadcasting signal through a digital multimedia broadcasting network are provided to improve sensitivity of an OFDM receiver by removing an IFFT(Inverse Fast Fourier Transform) unit in the OFDM(Orthogonal Frequency Division Multiplexing) receiver. An apparatus for receiving a broadcasting signal through a digital multimedia broadcasting network includes a correlation value generator(44), a frame synchronization estimator(45), a gain estimator(46), and a symbol timing offset unit(47). The correlation value generator correlates a synchronization signal, which is included in a time domain reception signal, with a reference signal, and generates a correlation value in the time domain. The frame synchronization estimator compares the time domain correlation value with a reference value. The gain estimator determines a gain based on the time domain correlation value. The symbol timing offset unit detects a sample index of the correlation value with the determined gain.
    • 提供了一种通过数字多媒体广播网络接收广播信号的方法和设备,通过去除OFDM(正交频分复用)接收机中的IFFT(快速傅里叶逆变换)单元来提高OFDM接收机的灵敏度。 一种用于通过数字多媒体广播网络接收广播信号的设备包括相关值发生器(44),帧同步估计器(45),增益估计器(46)和码元定时偏移单元(47)。 相关值生成器将包括在时域接收信号中的同步信号与参考信号相关,并且在时域中生成相关值。 帧同步估计器将时域相关值与参考值进行比较。 增益估计器基于时域相关值确定增益。 符号定时偏移单元利用确定的增益来检测相关值的样本索引。