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公开(公告)号：KR1020090014741A
公开(公告)日：2009-02-11
申请号：KR1020070078919
申请日：2007-08-07
Applicant: 한국전자통신연구원
CPC classification number: H04L27/2604 , H04L25/0224 , H04L27/2649
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：KR100882508B1
公开(公告)日：2009-02-06
申请号：KR1020070121508
申请日：2007-11-27
Applicant: 한국전자통신연구원
IPC: H04N21/6334
CPC classification number: H04H60/14 , H04H2201/11 , H04N21/4341 , H04N21/4382
Abstract: An apparatus and a method for receiving advanced DMB(Digital Multimedia Broadcasting) conditional access by using hierarchical modulation are provided efficiently to charge a user for various services which are transmitted to an enhanced hierarchy when providing a high efficient paid DMB service to the user. A control monitoring unit selects a desired channel in an RF signal inputted through a reception RF(Radio Frequency) unit(S310). The control monitoring unit outputs the selected channel signal to an OFDM demodulator, and demodulates and outputs the channel signal by discriminating an enhanced hierarchy service from a basic hierarchy service based on symbol values which are confirmed at OFDM symbols(S320). A demultiplexer of the basic hierarchy and the enhanced hierarchy demultiplexes and outputs the inputted signal by each hierarchy and parses FIC data and MSC data(S330). An enhanced hierarchy data analyzer, a basic hierarchy data analyzer and a video service stream analyzer determines whether or not the descrambling process is necessary(S340,S350), and a control and monitoring unit determines whether or not the highly qualified service should be provided(S370). If a highly qualified service mode is selected, a synthesizer combines those two hierarchies for providing the selected service well to output a stream by which a highly qualified service is possible(S380).
Abstract translation: 提供了一种用于通过使用分层调制来接收高级DMB（数字多媒体广播）条件访问的装置和方法，用于向用户收取为用户提供高效的付费DMB服务时被发送到增强层级的各种服务。 控制监视单元在通过接收RF（射频）单元输入的RF信号中选择期望的信道（S310）。 控制监视单元将所选择的信道信号输出到OFDM解调器，并且基于在OFDM符号中确认的符号值，通过从基本层级服务中区分增强层级服务来解调并输出信道信号（S320）。 基本层次和增强层次的解复用器对每个层次的输入信号进行解复用并解析FIC数据和MSC数据（S330）。 增强层次数据分析器，基本层级数据分析器和视频服务流分析器确定是否需要解扰过程（S340，S350），并且控制和监视单元确定是否应提供高质量的服务（ S370）。 如果选择了高度合格的服务模式，则合成器组合了这两个层次以提供所选择的服务，以便输出可以进行高质量服务的流（S380）。
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公开(公告)号：KR100882507B1
公开(公告)日：2009-02-06
申请号：KR1020070116006
申请日：2007-11-14
Applicant: 한국전자통신연구원
IPC: H04N21/418 , H04N7/10
CPC classification number: H04N21/6118 , H04N7/1675 , H04N21/4181 , H04N21/6334
Abstract: A digital cable broadcasting receiver including a security module and a method for authenticating the same are provided to only a subscriber who joins a normal broadcasting service to watch a broadcast program, consequently preventing the illegal watching of a broadcast program. A digital cable broadcasting receiver module(100) extracts transport stream data from a broadcasting signal received from a head-end system through the authentication process with a digital broadcast head end system(300). A separable conditional access module(200) which is inserted into the digital cable broadcast receiver module transmits descrambled transport stream data to a digital cable broadcast reliever module by descrambling the transport stream data received from the head end system. A separable and conditional receiving module which is a cable card of POD(Point Of Deployment) method realizes the bidirectional communication with the digital cable broadcast transceiver module through the conditional receiving module interface(180) of the digital cable broadcast receiver module.
Abstract translation: 包括安全模块及其认证方法的数字有线广播接收机只提供给正常广播业务的用户观看广播节目，从而防止非法观看广播节目。 数字有线广播接收机模块（100）通过与数字广播头端系统（300）的认证处理从从头端系统接收的广播信号中提取传输流数据。 插入数字有线广播接收机模块的可分离条件访问模块（200）通过对从头端系统接收的传输流数据进行解扰，将解扰的传输流数据发送到数字有线广播缓解器模块。 作为POD（部署点）的有线卡的可分离和有条件接收模块通过数字有线广播接收机模块的条件接收模块接口（180）实现与数字有线广播收发器模块的双向通信。
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公开(公告)号：KR1020090008852A
公开(公告)日：2009-01-22
申请号：KR1020070072151
申请日：2007-07-19
Applicant: 한국전자통신연구원
IPC: H04L27/26
CPC classification number: H04L27/2604 , H03M13/1102 , H03M13/23 , H03M13/2957 , H03M13/356 , H04L27/261
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：KR1020080112485A
公开(公告)日：2008-12-26
申请号：KR1020070060947
申请日：2007-06-21
Applicant: 한국전자통신연구원 , 성균관대학교산학협력단
CPC classification number: H04L27/2626 , H04L25/0204 , H04L27/2666 , H04L27/2695
Abstract: A method for OFDM(Orthogonal Frequency Division Multiplexing) communications capable of improving receiving performance of OFDM system using pilot signal and apparatus thereof are provided to steadily receive various adding data service during high speed moving. A method for OFDM(Orthogonal Frequency Division Multiplexing) communications capable of improving receiving performance of OFDM system using pilot signal comprises the following steps: a step for receiving a media signal from outside(501); a step for encoding/modulating an inputted digital signal(503, 505); and a step for inserting a pilot signal in a protective section of a modulated digital signal(513). The digital modulation step includes a step of a reverse fourier transforming(509) a signal which is orthogonally modulated.
Abstract translation: 提供了一种使用导频信号提高OFDM系统的接收性能的OFDM（正交频分复用）通信方法及其装置，用于在高速移动期间稳定地接收各种附加数据业务。 一种能够使用导频信号改善OFDM系统的接收性能的OFDM（正交频分复用）通信方法包括以下步骤：从外部接收媒体信号的步骤（501）; 用于对输入的数字信号进行编码/调制的步骤（503,505）; 以及用于将导频信号插入调制数字信号（513）的保护部分中的步骤。 数字调制步骤包括逆向傅立叶变换（509）正交调制信号的步骤。
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Patent Agency Ranking
公开(公告)号：KR1020080112074A
公开(公告)日：2008-12-24
申请号：KR1020070116459
申请日：2007-11-15
Applicant: 한국전자통신연구원
IPC: H04N21/236
CPC classification number: H04N21/64315 , H04N19/39 , H04N21/234327 , H04N21/236
Abstract: A transmission method of a digital broadcasting signal is provided to offer a various high quality service by supplying broadcasting service with higher data transmitting rate than conventional digital broadcasting. A first frame including the first service stream for restoring the service of the first quality is produced(S220). A second frame including the second service stream for restoring the service of the second quality higher than the first quality in addition to the first service stream is produced(S230). The first and the second frame are modulated to the first layer and the second layer(S240). A first transmission frame and the second transmission frame of the enhancement layer are transmitted(S250).
Abstract translation: 提供数字广播信号的发送方法，通过提供比传统数字广播更高的数据发送速率的广播业务来提供各种高质量的业务。 产生包括用于恢复第一品质的服务的第一服务流的第一帧（S220）。 产生除了第一服务流之外还包括用于恢复比第一品质高的第二品质的服务的第二服务流的第二帧（S230）。 第一和第二帧被调制到第一层和第二层（S240）。 发送第一传输帧和增强层的第二传输帧（S250）。
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公开(公告)号：KR100874266B1
公开(公告)日：2008-12-16
申请号：KR1020070039226
申请日：2007-04-23
Applicant: 한국전자통신연구원
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：KR100873486B1
公开(公告)日：2008-12-15
申请号：KR1020070045234
申请日：2007-05-09
Applicant: 한국전자통신연구원
CPC classification number: H04B7/15585
Abstract: Provided is an on-channel repeater, which includes a receiver for receiving radio frequency (RF) signals; a subtractor for subtracting replica from the RF signals to thereby produce output signals of the subtractor; a repeating process unit for performing a repeating process onto the output signals of the subtractor; and a replica generator for calculating replica based on the output signals of the subtractor and the signals obtained after repeating process performed thereon and feeding the replica back to the subtractor.
Abstract translation: 提供一种同信道中继器，其包括用于接收射频（RF）信号的接收机; 减法器，用于从RF信号中减去副本，从而产生减法器的输出信号; 重复处理单元，用于对减法器的输出信号执行重复处理; 以及副本生成器，用于基于减法器的输出信号和在其上执行的重复处理之后获得的信号来计算副本，并将副本送回减法器。
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公开(公告)号：KR100871838B1
公开(公告)日：2008-12-03
申请号：KR1020060091982
申请日：2006-09-21
Applicant: 한국전자통신연구원
Abstract: 1. 청구범위에 기재된 발명이 속한 기술분야
본 발명은 디지털 방송 수신기에서의 타이밍 락 검출 장치 및 그 방법에 관한 것임.
2. 발명이 해결하려고 하는 기술적 과제
본 발명은 수렴 정도를 판단하기 위해 심볼 동기부의 루프 필터에서 출력되는 타이밍 에러 신호의 차(ΔTiming_error), 즉 타이밍 지터 신호를 이용함으로써, 하드웨어의 복잡도를 현저히 감소시키면서도 락 오류를 방지하고 신속/정확한 수렴 특성을 획득할 수 있게 하는, 디지털 방송 수신기에서의 타이밍 락 검출 장치 및 그 방법을 제공하는데 그 목적이 있음.
3. 발명의 해결방법의 요지
본 발명은, 디지털 방송 수신기에서의 타이밍 락 검출 장치에 있어서, 심볼 동기부의 루프 필터로부터 입력되는 연속적인 타이밍 에러신호로부터 주기적으로 이산적인 신호값을 선택하기 위한 이산치 생성 수단; 상기 이산치 생성 수단에서 선택된 타이밍 에러 신호값의 시간에 따른 변화를 나타내는 타이밍 지터 신호를 구하기 위한 차등 계산 수단; 상기 타이밍 지터 신호의 부호 변화를 검출하기 위한 부호변화 검출 수단; 상기 부호변화 검출 수단에서 검출된 부호변화 시점을 기준으로 구간을 구분하고, 매 구분구간마다 상기 타이밍 지터 신호의 수렴 모드에 따라 상기 루프 필터의 락 스텝을 제어하는 락 제어신호를 생성하기 위한 락 제어신호 생성 수단; 및 상기 타이밍 지터 신호의 정상상태 도달 여부 및 현재의 락 스텝 상태를 이용하여 락 신호 또는 언락 신호를 생성하기 위한 락검출신호 생성 수단을 포함함.
4. 발명의 중요한 용도
본 발명은 타이밍 락 검출 장치 및 방법 등에 이용됨.
디지털 위상 동기 루프, 심볼 타이밍, 반송파 주파수 동기, 반송파 위상 동기, 락 검출, 타이밍 에러 신호, 타이밍 지터 신호-
公开(公告)号：KR1020080097556A
公开(公告)日：2008-11-06
申请号：KR1020070042568
申请日：2007-05-02
Applicant: 한국전자통신연구원
CPC classification number: H04L27/2657 , H04L27/16 , H04L27/2666
Abstract: An apparatus and a method for estimating a frequency offset improve reception performance of a mobile communication system and reduce complexity of the system by estimating interval of a subcarrier up to integral number or prime number times. A first correlative value is calculated by correlating the received signal with a signal of a first block corresponding to a part of a protective section of a reference symbol included in the received signal. A second correlative value is calculated by correlating the received signal with a signal of a second block corresponding to a part of a protective section. The first correlative value is time-delayed(S540). The frequency offset is estimated by using the delayed first and second correlative values.
Abstract translation: 用于估计频率偏移的装置和方法提高了移动通信系统的接收性能，并通过估计子载波的间隔达到整数或素数次来降低系统的复杂度。 通过将接收到的信号与对应于包括在接收信号中的参考符号的保护部分的一部分的第一块的信号进行相关来计算第一相关值。 通过将接收的信号与对应于保护部分的一部分的第二块的信号相关联来计算第二相关值。 第一个相关值是时间延迟的（S540）。 通过使用延迟的第一和第二相关值来估计频率偏移。
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