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公开(公告)号：KR100890440B1
公开(公告)日：2009-03-30
申请号：KR1020070130940
申请日：2007-12-14
Applicant: 한국전자통신연구원
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 translation: 提供了一种用于更精确地检测同步的接收装置和同步检测方法，以通过使用与采样间隔和相位参考信号相对应的接收信号来检测采样的起始点和帧的起始点。 信号检测单元（110）从接收信号中检测零信号和相位参考信号。 同步检测器（120）通过使用空信号检测帧的第一起始时间点。 使用对应于由相位参考信号确定的多个相关系数的多个第一延迟抽头和对应于采样周期振铃的采样周期的第二延迟抽头。 从第一起始时间点检测帧的第二起始时间点。
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公开(公告)号：KR1020090025874A
公开(公告)日：2009-03-11
申请号：KR1020070091034
申请日：2007-09-07
Applicant: 한국전자통신연구원
CPC classification number: H04L25/0212 , H04B7/155 , H04L25/022 , H04L25/0224 , H04L25/0228 , H04L25/0246 , H04B7/15507
Abstract: A reverse channel estimator of a relay reception channel using a channel estimator and a filter factor generating unit and a method thereof are provided to secure stability and causality due to dividing a filter factor at a time domain into reverse minimal phase filter factor and coolie delay filter factor. A channel estimator(41) estimates a channel caused by a transmission line from the received signal in which the promised signal is inserted. A reverse minimal phase filter factor generating unit(42) produces a reverse channel of a minimal phase channel from a channel estimated at a channel estimator. A reverse minimal phase filter factor generating unit converts the generated reverse channel into the filter factor at a time domain. A reverse delay filter factor generating unit(43) produces the filter factor at the time domain by using the minimal phase channel estimated at the channel estimator. A connection unit(44) generates reverse channel of the receive channel at the time domain.
Abstract translation: 提供使用信道估计器和滤波器因子生成单元的中继接收信道的反向信道估计器及其方法，以确保由于将时域上的滤波因子分解为反向最小相位滤波因子和冷却延迟滤波器的稳定性和因果关系 因子。 信道估计器（41）从其中插入应答信号的接收信号估计由传输线引起的信道。 反向最小相位滤波器因子产生单元（42）从在信道估计器处估计的信道产生最小相位信道的反向信道。 反向最小相位滤波器因子产生单元将产生的反向信道在时域转换成滤波器因子。 反向延迟滤波器因子生成单元（43）通过使用在信道估计器处估计的最小相位信道在时域产生滤波器因子。 连接单元（44）在时域产生接收信道的反向信道。
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公开(公告)号：KR100886799B1
公开(公告)日：2009-03-05
申请号：KR1020070058666
申请日：2007-06-15
Applicant: 한국전자통신연구원
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-
公开(公告)号：KR1020090019463A
公开(公告)日：2009-02-25
申请号：KR1020070083913
申请日：2007-08-21
Applicant: 한국전자통신연구원
CPC classification number: H04B7/15585 , H04B1/525 , H04L25/03019
Abstract: An apparatus and a method for relaying the same channel are provided to relay an output signal having short time delay whose distortion is corrected, thereby improving use efficiency of limited frequency resources. An identification signal generating unit(810) generates an identification signal having a good correlation property. A feedback signal removing unit(804) generates a replica of a feedback signal based on the identification signal and a receiving signal from a main transmitter or another relay device. And the feedback signal removing unit removes the feedback signal by using the generated replica. A demodulation unit(806) converts the signal received from the feedback signal removing unit into a baseband signal. An identification signal insertion unit(812) inserts an identification signal generated by an identification signal generating unit into the baseband signal. Transmitting units(816,818) transmit the baseband signal to which the identification signal is inserted.
Abstract translation: 提供用于中继相同信道的装置和方法，用于中继具有纠错失真的具有短时间延迟的输出信号，从而提高有限频率资源的使用效率。 识别信号生成部（810）生成具有良好的相关性的识别信号。 反馈信号去除单元（804）基于识别信号和来自主发射机或另一个中继设备的接收信号产生反馈信号的副本。 并且反馈信号去除单元通过使用所生成的副本来去除反馈信号。 解调单元（806）将从反馈信号去除单元接收的信号转换为基带信号。 识别信号插入单元（812）将由识别信号生成单元生成的识别信号插入到基带信号中。 发送单元（816,818）发送识别信号被插入到其中的基带信号。
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公开(公告)号：KR100884381B1
公开(公告)日：2009-02-17
申请号：KR1020070042568
申请日：2007-05-02
Applicant: 한국전자통신연구원
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-
Patent Agency Ranking
公开(公告)号：KR1020090014767A
公开(公告)日：2009-02-11
申请号：KR1020070078965
申请日：2007-08-07
Applicant: 한국전자통신연구원
CPC classification number: H04N21/234318 , H04N21/2362 , H04N21/242 , H04N21/4307 , H04N21/6112 , H04N21/64315 , H04N21/8547
Abstract: A DMB(Digital Multimedia Broadcasting) broadcasting system and method are provided to synchronize the ETI stream of different networks of the DMB broadcasting system, thereby providing stable broadcasting reception to DMB receivers. A first ETI(Ensemble Transport Interface) signal is received from a first network. A second ETI signal is received from a second network. The same frame is searched by comparing the first ETI signal with the second ETI signal. The difference of delay time between the same frames is determined. According to the difference of the delay time, the first ETI signal and the second ETI signal are synchronized. A process of checking an error for the first ETI signal is performed. A process of checking an error for the second ETI signal is performed.
Abstract translation: 提供了DMB（数字多媒体广播）广播系统和方法来同步DMB广播系统的不同网络的ETI流，从而向DMB接收机提供稳定的广播接收。 从第一网络接收第一ETI（集合传输接口）信号。 从第二网络接收第二ETI信号。 通过将第一ETI信号与第二ETI信号进行比较来搜索相同的帧。 确定相同帧之间的延迟时间差。 根据延迟时间的差异，第一ETI信号和第二ETI信号同步。 执行检查第一ETI信号的错误的处理。 执行检查第二ETI信号的错误的处理。
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公开(公告)号：KR100880046B1
公开(公告)日：2009-01-22
申请号：KR1020070108528
申请日：2007-10-26
Applicant: 한국전자통신연구원
CPC classification number: H04H20/59 , H04H20/02 , H04N21/414 , H04N21/440236
Abstract: An apparatus and a method of relaying a digital multimedia broadcast for an emergency broadcasting service are provided to convert a currently broadcast digital multimedia broadcasting signal to an emergency signal, and transmit the emergency signal, thereby easily providing the emergency broadcasting service to a specific area. A broadcasting relay apparatus(100) comprises a broadcasting receiving unit(110), an emergency signal generating unit(130), a signal switching unit(120) and a broadcasting transmitting unit(140). The emergency signal generating unit encodes, multiplexes and modulates an emergency broadcasting message inputted from a user to be suitable for channel information of a broadcasting signal. The emergency signal generating unit generates an emergency signal. The signal switching unit switches a signal to be connected to one of the broadcasting receiving unit and the emergency signal generating unit. The broadcasting transmitting unit transmits a broadcasting signal or an emergency signal outputted from the signal switching unit.
Abstract translation: 提供一种用于中继紧急广播业务的数字多媒体广播的装置和方法，用于将当前广播的数字多媒体广播信号转换为紧急信号，并发送紧急信号，从而容易地向特定区域提供紧急广播业务。 广播中继装置（100）包括广播接收单元（110），紧急信号生成单元（130），信号切换单元（120）和广播发送单元（140）。 紧急信号发生单元编码，复用和调制从用户输入的适合于广播信号的频道信息的紧急广播消息。 紧急信号生成部生成紧急信号。 信号切换单元切换要连接到广播接收单元和紧急信号发生单元之一的信号。 广播发送单元发送从信号切换单元输出的广播信号或紧急信号。
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公开(公告)号：KR100875935B1
公开(公告)日：2008-12-26
申请号：KR1020070067185
申请日：2007-07-04
Applicant: 한국전자통신연구원 , 부산대학교 산학협력단
IPC: H04J11/00
Abstract: A method and an apparatus for hierarchical modulation/demodulation in an OFDM(Orthogonal Frequency Division Multiplexing) system are provided to perform an in-phase demodulation by using a pilot which is transferred to a second layer. A hierarchical modulation apparatus in an OFDM system includes first and second encoders(110,120), a pilot insertion unit(130), and a hierarchical modulation unit(140). The first encoder encodes a first layer signal stream, which is a basic layer signal. The second encoder encodes a second layer signal stream which is an enhancement layer signal. The pilot insertion portion inserts a pilot signal for estimating a channel coefficient to an encoded second layer signal stream. The hierarchical modulation portion modulates the second layer signal stream, to which the pilot signal is inserted, and the encoded first layer signal stream, and combines the encoded signals with each other.
Abstract translation: 提供了用于OFDM（正交频分复用）系统中的分层调制/解调的方法和装置，以通过使用传送到第二层的导频来执行同相解调。 OFDM系统中的分层调制装置包括第一和第二编码器（110,120），导频插入单元（130）和分层调制单元（140）。 第一编码器对第一层信号流进行编码，该第一层信号流是基本层信号。 第二编码器对作为增强层信号的第二层信号流进行编码。 导频插入部分将用于估计信道系数的导频信号插入编码的第二层信号流。 分层调制部分对导频信号所插入的第二层信号流和编码的第一层信号流进行调制，并将编码信号彼此组合。
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公开(公告)号：KR100873487B1
公开(公告)日：2008-12-15
申请号：KR1020070045235
申请日：2007-05-09
Applicant: 한국전자통신연구원
CPC classification number: H04B7/15585
Abstract: Provided are an on-channel repeater and an on-channel repeating method. The on-channel repeater includes: a receiving means for receiving a Radio Frequency (RF) signal; a subtracting means for subtracting a replica of feedback signals from the signal received by the receiving means; a replica generating means for calculating the replica based on the signal acquired from the subtraction in the subtracting means and feeding back the replica to the subtracting means; an inverse channel estimating means for estimating inverse of a reception channel based on the signal acquired from the subtraction in the subtracting means and generating filter tab coefficients; a first adaptive filtering means for compensating for channel distortion of the signal subtracted by the subtracting means based on the filter tab coefficients generated in the inverse channel estimating means; and a transmitting means for converting a signal whose channel distortion is compensated by the first adaptive filtering means into an RF signal and performing radio transmission.
Abstract translation: 提供了同频转发器和同频重复方法。 同频转发器包括：接收装置，用于接收射频（RF）信号; 减法装置，用于从由接收装置接收的信号中减去反馈信号的复制品; 复制品生成装置，用于基于在减法装置中从减法获得的信号计算复制品，并将复制品反馈给减法装置; 逆信道估计装置，用于根据减法装置中的减法获得的信号估计接收信道的倒数，并产生滤波器标签系数; 第一自适应滤波装置，用于基于在反向信道估计装置中产生的滤波器标签系数来补偿由减法装置减去的信号的信道失真; 以及发射装置，用于将其信道失真由第一自适应滤波装置补偿的信号转换为RF信号并执行无线电发射。
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公开(公告)号：KR1020080099552A
公开(公告)日：2008-11-13
申请号：KR1020070045234
申请日：2007-05-09
Applicant: 한국전자통신연구원
CPC classification number: H04B7/15585
Abstract: Co-channel relaying equipment and a method thereof are provided to remove noises, multipath signals and residual feedback signals caused by the channel between the main transmitter and a co-channel repeater. Co-channel relaying equipment comprises the followings: receiving units(801,802) which receive radio frequency signals and convert them into signals of a base band; a subtraction means(803) which subtracts the replica of feedback signals from the baseband signals converted by the receiving units; a demodulation means(804) for modulating the subtracted signal; equalization means(805) for equalizing the signal demodulated by the demodulation means; a transmission means(807) which modulates signals outputted from the equalization means, converts them into radio frequency signals, and then wirelessly transmits the converted signals; a down-conversion means(809) for down-converting the radio frequency signals into the base band; and a replica generation means(810) which produces a replica based on the subtracted signal and baseband signal.
Abstract translation: 提供同频道中继设备及其方法，以消除由主发射机和同频道中继器之间的信道引起的噪声，多径信号和残留反馈信号。 共同信道中继设备包括：接收单元（801,802），接收射频信号并将其转换为基带信号; 减法装置（803），其从由接收单元转换的基带信号中减去反馈信号的副本; 用于调制所述减去的信号的解调装置（804）; 均衡装置（805），用于对由解调装置解调的信号进行均衡; 调制从均衡装置输出的信号的发送装置（807）将其转换成射频信号，然后无线地发送转换的信号; 用于将射频信号下变频为基带的下变频装置（809）; 以及基于所减去的信号和基带信号产生副本的副本生成装置（810）。
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