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1.发明申请METHOD AND APPARATUS FOR COMPENSATING FOR VARIABLE SYMBOL TIMING USING CYCLIC PREFIX IN NON-SYNCHRONIZED OFDM SYSTEM 有权在非同步OFDM系统中使用循环前缀来补偿可变符号时序的方法和装置公开(公告)号：US20140286468A1
公开(公告)日：2014-09-25
申请号：US14097440
申请日：2013-12-05
Inventor： Jae Ho LEE , Yang Su Kim , Sang Jung Ra , Han Seung Koo , Dong Joon Choi , Nam Ho Hur
IPC: H04L7/00
CPC classification number: H04L7/0079 , H04L27/2656 , H04L27/2663 , H04L27/2678
Abstract: Disclosed are a method and apparatus for estimating symbol timing in a non-synchronized OFDM system. The present invention includes synchronizing a frame of a received signal, estimating the symbol timing of each symbol of the frame based on the synchronization, compensating for the symbol timing using a phase difference attributable to a Symbol Timing Offset (STO), variably changing within a Cyclic Prefix (CP) interval due to the frequency offset of a sampling clock and thermal noise, and performing channel equalization using a preamble based on output including corrected phase rotation.
Abstract translation: 公开了一种在非同步OFDM系统中估计符号定时的方法和装置。 本发明包括使接收信号的帧同步，基于同步来估计帧的每个符号的符号定时，使用归因于符号定时偏移（STO）的相位差来补偿符号定时，该相位差可在一个 由于采样时钟和热噪声的频率偏移导致的循环前缀（CP）间隔，并且使用基于包括校正相位旋转的输出的前导码来执行信道均衡。
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2.发明授权公开(公告)号：US10193687B2
公开(公告)日：2019-01-29
申请号：US15441799
申请日：2017-02-24
Inventor： Jae Hwui Bae , Sang Jung Ra , Jin Hyuk Song , Dong Joon Choi , Nam Ho Hur
Abstract: Disclosed are a method for acquiring synchronization in a cable network, and a physical (PHY) transmitter and PHY receiver. The method for acquiring synchronization in a cable network according to an embodiment includes receiving, by a PHY receiver, a signal from a PHY transmitter, and acquiring, by the PHY receiver, channel synchronization when a symbol in which a channel preamble exists is detected from the received signal and a position of a frequency in which a channel subcarrier exists is detected from the detected symbol by performing a cross correlation operation on the received signal and the channel preamble.
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3.发明授权Method and apparatus for compensating for variable symbol timing using cyclic prefix in non-synchronized OFDM system 有权用于在非同步OFDM系统中使用循环前缀补偿可变符号定时的方法和装置公开(公告)号：US09154293B2
公开(公告)日：2015-10-06
申请号：US14097440
申请日：2013-12-05
Inventor： Jae Ho Lee , Yang Su Kim , Sang Jung Ra , Han Seung Koo , Dong Joon Choi , Nam Ho Hur
CPC classification number: H04L7/0079 , H04L27/2656 , H04L27/2663 , H04L27/2678
Abstract: Disclosed are a method and apparatus for estimating symbol timing in a non-synchronized OFDM system. The present invention includes synchronizing a frame of a received signal, estimating the symbol timing of each symbol of the frame based on the synchronization, compensating for the symbol timing using a phase difference attributable to a Symbol Timing Offset (STO), variably changing within a Cyclic Prefix (CP) interval due to the frequency offset of a sampling clock and thermal noise, and performing channel equalization using a preamble based on output including corrected phase rotation.
Abstract translation: 公开了一种在非同步OFDM系统中估计符号定时的方法和装置。 本发明包括使接收信号的帧同步，基于同步来估计帧的每个符号的符号定时，使用归因于符号定时偏移（STO）的相位差来补偿符号定时，该相位差可在一个 由于采样时钟和热噪声的频率偏移导致的循环前缀（CP）间隔，并且使用基于包括校正相位旋转的输出的前导码来执行信道均衡。
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4.发明授权Method and apparatus for inserting broadcast program by detecting available channel over hybrid fiber coax network or optical cable network 有权通过混合光纤同轴网络或光缆网络检测可用信道来插入广播节目的方法和装置公开(公告)号：US09027071B2
公开(公告)日：2015-05-05
申请号：US13868674
申请日：2013-04-23
Inventor： Yang Su Kim , Han Seung Koo , Jae Ho Lee , Sang Jung Ra , Dong Joon Choi , Nam Ho Hur
IPC: H04N21/2385 , H04N21/2383 , H04N21/61 , H04H20/06 , H04H60/41
CPC classification number: H04N21/2385 , H04H20/06 , H04H60/41 , H04N21/2383 , H04N21/6118
Abstract: An apparatus for combining a broadcasting channel may include a channel detector to detect a vacant Radio Frequency (RF) broadcasting channel used by a photoelectric converter that converts a first broadcast program as an optical signal to a first RF signal, a broadcast receiving interface to receive at least one second broadcast program, a broadcast modulator to generate a second RF signal by modulating the second broadcast program using the vacant RF broadcasting channel, and a channel combiner to combine a broadcasting channel used for the first RF signal and the vacant RF broadcasting channel.
Abstract translation: 用于组合广播信道的装置可以包括：信道检测器，用于检测由光电转换器使用的空闲射频（RF）广播信道，其将作为光信号的第一广播节目转换为第一RF信号;广播接收接口，用于接收 至少一个第二广播节目，通过使用空闲RF广播频道调制第二广播节目来产生第二RF信号的广播调制器，以及组合用于第一RF信号的广播频道和空闲RF广播频道 。
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