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1. 发明授权

US08275059B2 Frequency synchronization apparatus and method in OFDM system 失效
标题翻译： OFDM系统中的频率同步装置和方法
公开(公告)号：US08275059B2
公开(公告)日：2012-09-25
申请号：US12477269
申请日：2009-06-03
申请人： Bon Young Koo , Hyung Jin Choi , Se Bin Im , Jung In Kim
发明人： Bon Young Koo , Hyung Jin Choi , Se Bin Im , Jung In Kim
IPC分类号： H04L27/28
CPC分类号： H04L27/2657 , H04L27/2676 , H04L27/2688
摘要： A frequency synchronization apparatus includes: a correlating unit that obtains a first correlation value by correlating a known reference guard interval of an OFDM symbol and a reference copy interval corresponding to the reference guard interval, and obtains a second correlation value by correlating the estimate guard interval and an estimate copy interval corresponding to the estimate guard interval; a determining unit that compares the first and second correlation values to determine a first case where the first correlation value is larger by a pre-set magnification than the second correlation value, a second case where the second correlation value is larger by a pre-set magnification than the first correlation value, and a third case which is not the first case nor the second case; and a frequency offset estimating unit that estimates a frequency offset by using a correlation value corresponding to any one of the first to third.
摘要翻译：频率同步装置包括：相关单元，通过将OFDM符号的已知参考保护间隔与对应于参考保护间隔的参考复制间隔相关联来获得第一相关值，并且通过将估计保护间隔以及对应于估计保护间隔的估计复制间隔; 确定单元，其比较所述第一和第二相关值，以确定所述第一相关值比所述第二相关值大预定倍数的第一情况，所述第二相关值大于预设值的第二情况并且不是第一种情况的第三种情况也不是第二种情况; 以及频率偏移估计单元，其通过使用与第一至第三中的任一个相对应的相关值来估计频率偏移。

2. 发明申请

US20100142632A1 FREQUENCY SYNCHRONIZATION APPARATUS AND METHOD IN OFDM SYSTEM 失效
标题翻译： OFDM系统中的频率同步装置和方法
公开(公告)号：US20100142632A1
公开(公告)日：2010-06-10
申请号：US12477269
申请日：2009-06-03
申请人： Bon Young Koo , Hyung Jin Choi , Se Bin Im , Jung In Kim
发明人： Bon Young Koo , Hyung Jin Choi , Se Bin Im , Jung In Kim
IPC分类号： H04L27/28
CPC分类号： H04L27/2657 , H04L27/2676 , H04L27/2688
摘要： A frequency synchronization apparatus includes: a correlating unit that obtains a first correlation value by correlating a known reference guard interval of an OFDM symbol and a reference copy interval corresponding to the reference guard interval, and obtains a second correlation value by correlating the estimate guard interval and an estimate copy interval corresponding to the estimate guard interval; a determining unit that compares the first and second correlation values to determine a first case where the first correlation value is larger by a pre-set magnification than the second correlation value, a second case where the second correlation value is larger by a pre-set magnification than the first correlation value, and a third case which is not the first case nor the second case; and a frequency offset estimating unit that estimates a frequency offset by using a correlation value corresponding to any one of the first to third.
摘要翻译：频率同步装置包括：相关单元，通过将OFDM符号的已知参考保护间隔与对应于参考保护间隔的参考复制间隔相关联来获得第一相关值，并且通过将估计保护间隔以及对应于估计保护间隔的估计复制间隔; 确定单元，其比较所述第一和第二相关值，以确定所述第一相关值比所述第二相关值大预定倍数的第一情况，所述第二相关值大于预设值的第二情况并且不是第一种情况的第三种情况也不是第二种情况; 以及频率偏移估计单元，其通过使用与第一至第三中的任一个相对应的相关值来估计频率偏移。

3. 发明授权

US08121206B2 Apparatus and method for estimating delay spread of multi-path fading channel in OFDM system 失效
标题翻译： OFDM系统中多径衰落信道延迟扩展的装置及方法
公开(公告)号：US08121206B2
公开(公告)日：2012-02-21
申请号：US12193494
申请日：2008-08-18
申请人： Hyun Suk Lee , Se Bin Im , Je Hyuk Ryu , Jae Goon Aum , Jung Tae Kim , Hyung Jin Choi
发明人： Hyun Suk Lee , Se Bin Im , Je Hyuk Ryu , Jae Goon Aum , Jung Tae Kim , Hyung Jin Choi
IPC分类号： H04L27/28
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/023 , H04L27/2647
摘要： Provided is an apparatus for estimating a delay spread of a multi-path fading channel in an Orthogonal Frequency Division Multiplexing (OFDM) system. The apparatus is applied to an OFDM receiver including a channel equalization unit compensating channel distortion by estimating channel distortion at pilot locations with respect to output signals of an FFT unit.
摘要翻译：提供了一种用于估计正交频分复用（OFDM）系统中的多径衰落信道的延迟扩展的装置。该装置被应用于包括信道均衡单元的OFDM接收机，该OFDM接收机通过估计导频位置处相对于FFT单元的输出信号的信道失真来补偿信道失真。

4. 发明授权

US08428197B2 Enhanced channel estimation for communication system receiver 失效
标题翻译：通信系统接收机的增强信道估计
公开(公告)号：US08428197B2
公开(公告)日：2013-04-23
申请号：US11445735
申请日：2006-06-01
申请人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
发明人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
IPC分类号： H04L27/06
CPC分类号： H04L25/0212 , H04L5/0023 , H04L25/022 , H04L25/0228 , H04L25/0232 , H04L27/2647
摘要： An embodiment of the present invention is a technique to process signals in a communication system. A channel impulse response (CIR) generator generates a time-domain windowed CIR from a received signal using a window function. A thresholder thresholds the time-domain windowed CIR. A compensator compensates window effect for the thresholded time-domain windowed CIR to provide an enhanced channel estimate in frequency domain.
摘要翻译：本发明的实施例是一种在通信系统中处理信号的技术。信道脉冲响应（CIR）发生器使用窗口函数从接收到的信号生成时域窗口CIR。阈值阈值限制了时域窗口的CIR。补偿器补偿阈值时域窗口CIR的窗口效应，以在频域中提供增强的信道估计。

5. 发明授权

US08184753B2 Apparatus and method for OFDM channel equalization 失效
标题翻译： OFDM信道均衡的装置和方法
公开(公告)号：US08184753B2
公开(公告)日：2012-05-22
申请号：US12492488
申请日：2009-06-26
申请人： Jin Yong Kang , Hyung Jin Choi , Se Bin Im , Kyung Doc Jang
发明人： Jin Yong Kang , Hyung Jin Choi , Se Bin Im , Kyung Doc Jang
IPC分类号： H04B1/10
CPC分类号： H04L25/0204 , H04L25/0242 , H04L25/03159 , H04L25/03821 , H04L27/2647 , H04L2025/0342
摘要： An apparatus and method for orthogonal frequency division multiplexing (OFDM) channel equalization are disclosed. The apparatus includes a compensation value setting unit setting a compensation value in the form of a diagonal matrix by use of a diagonal matrix of diagonal elements extracted from a channel matrix of an OFDM receiver, and a preset divergence suppression value, an initial estimation value calculation unit calculating an initial estimate value by use of a fast Fourier transform (FFT)-processed signal of the OFDM receiver and the compensation value, an equalization unit detecting a transmission signal to be processed by use of the compensation value, the channel matrix and the diagonal matrix, and a symbol decision unit determining a symbol for an adjacent signal of a transmission signal, which is to be processed among a plurality of signals output from the equalization unit, and providing the symbol-determined adjacent signal to the equalization unit.
摘要翻译：公开了一种用于正交频分复用（OFDM）信道均衡的装置和方法。该装置包括补偿值设定单元，其通过使用从OFDM接收器的信道矩阵提取的对角元素的对角矩阵和预设发散抑制值，初始估计值计算来设置对角矩阵形式的补偿值单元通过使用OFDM接收机的快速傅立叶变换（FFT）处理信号和补偿值来计算初始估计值，均衡单元，其通过使用补偿值来检测要处理的传输信号，信道矩阵和对角矩阵，以及符号判定单元，确定要从所述均衡单元输出的多个信号中处理的发送信号的相邻信号的符号，并将所述符号确定的相邻信号提供给所述均衡单元。

6. 发明申请

US20100158094A1 APPARATUS AND METHOD FOR OFDM CHANNEL EQUALIZATION 失效
标题翻译：用于OFDM信道均衡的装置和方法
公开(公告)号：US20100158094A1
公开(公告)日：2010-06-24
申请号：US12492488
申请日：2009-06-26
申请人： Jin Yong Kang , Hyung Jin Choi , Se Bin Im , Kyung Doc Jang
发明人： Jin Yong Kang , Hyung Jin Choi , Se Bin Im , Kyung Doc Jang
IPC分类号： H04B1/10 , H03H7/30
CPC分类号： H04L25/0204 , H04L25/0242 , H04L25/03159 , H04L25/03821 , H04L27/2647 , H04L2025/0342
摘要： An apparatus and method for orthogonal frequency division multiplexing (OFDM) channel equalization are disclosed. The apparatus includes a compensation value setting unit setting a compensation value in the form of a diagonal matrix by use of a diagonal matrix of diagonal elements extracted from a channel matrix of an OFDM receiver, and a preset divergence suppression value, an initial estimation value calculation unit calculating an initial estimate value by use of a fast Fourier transform (FFT)-processed signal of the OFDM receiver and the compensation value, an equalization unit detecting a transmission signal to be processed by use of the compensation value, the channel matrix and the diagonal matrix, and a symbol decision unit determining a symbol for an adjacent signal of a transmission signal, which is to be processed among a plurality of signals output from the equalization unit, and providing the symbol-determined adjacent signal to the equalization unit.
摘要翻译：公开了一种用于正交频分复用（OFDM）信道均衡的装置和方法。该装置包括补偿值设定单元，其通过使用从OFDM接收器的信道矩阵提取的对角元素的对角矩阵和预设发散抑制值，初始估计值计算来设置对角矩阵形式的补偿值单元通过使用OFDM接收机的快速傅立叶变换（FFT）处理信号和补偿值来计算初始估计值，均衡单元，其通过使用补偿值来检测要处理的传输信号，信道矩阵和对角矩阵，以及符号判定单元，确定要从所述均衡单元输出的多个信号中处理的发送信号的相邻信号的符号，并将所述符号确定的相邻信号提供给所述均衡单元。

7. 发明申请

US20090168908A1 APPARATUS AND METHOD FOR ESTIMATING DELAY SPREAD OF MULTI-PATH FADING CHANNEL IN OFDM SYSTEM 失效
标题翻译：用于估计OFDM系统中多路径衰减信道延迟延迟的装置和方法
公开(公告)号：US20090168908A1
公开(公告)日：2009-07-02
申请号：US12193494
申请日：2008-08-18
申请人： Hyun Suk LEE , Se Bin Im , Je Hyuk Ryu , Jae Goon Aum , Jung Tae Kim , Hyung Jin Choi
发明人： Hyun Suk LEE , Se Bin Im , Je Hyuk Ryu , Jae Goon Aum , Jung Tae Kim , Hyung Jin Choi
IPC分类号： H04L27/28
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/023 , H04L27/2647
摘要： Provided is an apparatus for estimating a delay spread of a multi-path fading channel in an Orthogonal Frequency Division Multiplexing (OFDM) system. The apparatus is applied to an OFDM receiver including a channel equalization unit compensating channel distortion by estimating channel distortion at pilot locations with respect to output signals of an FFT unit.
摘要翻译：提供了一种用于估计正交频分复用（OFDM）系统中的多径衰落信道的延迟扩展的装置。该装置被应用于包括信道均衡单元的OFDM接收机，该OFDM接收机通过估计导频位置处相对于FFT单元的输出信号的信道失真来补偿信道失真。

8. 发明申请

US20070280363A1 Enhanced channel estimation for communication system receiver 失效
标题翻译：通信系统接收机的增强信道估计
公开(公告)号：US20070280363A1
公开(公告)日：2007-12-06
申请号：US11445735
申请日：2006-06-01
申请人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
发明人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
IPC分类号： H04K1/10
CPC分类号： H04L25/0212 , H04L5/0023 , H04L25/022 , H04L25/0228 , H04L25/0232 , H04L27/2647
摘要： An embodiment of the present invention is a technique to process signals in a communication system. A channel impulse response (CIR) generator generates a time-domain windowed CIR from a received signal using a window function. A thresholder thresholds the time-domain windowed CIR. A compensator compensates window effect for the thresholded time-domain windowed CIR to provide an enhanced channel estimate in frequency domain.
摘要翻译：本发明的实施例是一种在通信系统中处理信号的技术。信道脉冲响应（CIR）发生器使用窗口函数从接收到的信号生成时域窗口CIR。阈值阈值限制了时域窗口的CIR。补偿器补偿阈值时域窗口CIR的窗口效应，以在频域中提供增强的信道估计。

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