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    Enhanced channel estimation for communication system receiver
    1.
    发明授权
    Enhanced channel estimation for communication system receiver 失效
    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。

    Frequency synchronization apparatus and method in OFDM system
    3.
    发明授权
    Frequency synchronization apparatus and method in OFDM system 失效
    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。

    METHOD FOR DEMODULATING RECEIVED SIGNALS AND APPARATUS THEREFORE
    4.
    发明申请
    METHOD FOR DEMODULATING RECEIVED SIGNALS AND APPARATUS THEREFORE 有权
    用于解调接收到的信号的方法及其装置

    公开(公告)号：US20120134453A1

    公开(公告)日：2012-05-31

    申请号：US13388848

    申请日：2010-08-04

    申请人： Hyung-Jin Choi ,  Young-Il Min ,  Se-Bin Im

    发明人： Hyung-Jin Choi ,  Young-Il Min ,  Se-Bin Im

    IPC分类号： H04L27/06

    CPC分类号： H04L27/0012

    摘要： Disclosed are a method for demodulating received signals and an apparatus therefore which can maintain quality of signals and can reduce computational complexity. A demodulation method of a receiving device for receiving a plurality of signals modulated through a M-ary (M is a natural number of 1 or more) modulation method includes: comparing channel frequency response power of a first channel with channel frequency response power of a second channel, selecting M reference signals on the basis of the compared result, selecting corresponding signals paired with respective selected M reference signals, and estimating transmitting signals from the M signal pairs including pairs of the reference signal and the corresponding signal. Accordingly, the computational complexity is reduced from O (M2) to O (M).

    摘要翻译： 公开了一种用于解调接收信号的方法以及因此可以保持信号质量并且可以降低计算复杂度的装置。 一种用于接收通过M进制调制的多个信号的接收装置的解调方法（M是1或更多的自然数）调制方法包括：将第一信道的信道频率响应功率与信道频率响应功率进行比较， 第二通道，基于比较结果选择M个参考信号，选择与各自选择的M个参考信号配对的相应信号，以及估计来自包括参考信号和相应信号对的M个信号对的发送信号。 因此，计算复杂度从O（M2）减少到O（M）。

    Apparatus and method for OFDM channel equalization
    5.
    发明授权
    Apparatus and method for OFDM channel equalization 失效
    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。

    Wireless communication system and method for performing communication in the wireless communication system
    7.
    发明授权
    Wireless communication system and method for performing communication in the wireless communication system 有权
    用于在无线通信系统中执行通信的无线通信系统和方法

    公开(公告)号：US08379741B2

    公开(公告)日：2013-02-19

    申请号：US12849758

    申请日：2010-08-03

    申请人： Hyung-Jin Choi ,  Won-Jun Hwang ,  Se-Bin Im

    发明人： Hyung-Jin Choi ,  Won-Jun Hwang ,  Se-Bin Im

    IPC分类号： H04K1/10

    CPC分类号： H04B7/2606 ,  H04L1/0076 ,  H04L5/003

    摘要： Provided are a wireless communication system and a method of performing communication in the same. The wireless communication system includes a terminal configured to classify all subcarriers into a first group and a second group and allocate subcarriers of the first group to first symbols and subcarriers of the second group to the first symbols again to generate and transmit a first transmission signal, a base station configured to allocate the subcarriers of the first group to second symbols and the subcarriers of the second group to third symbols to generate and transmit a second transmission signal, and a relay configured to receive the first and second transmission signals and perform maximum likelihood (ML) determination of frequency domain signals of the first and second transmission signals to estimate the first to third symbols.

    摘要翻译： 提供一种无线通信系统和执行通信的方法。 无线通信系统包括终端，其被配置为将所有子载波分类为第一组和第二组，并且将第一组的子载波再次分配给第一组的第一符号和副载波，以再次产生并发送第一传输信号， 基站，被配置为将第一组的子载波分配给第二组的第二符号和第二组的子载波以分配给第三符号，以产生和发送第二传输信号;以及中继器，被配置为接收第一和第二传输信号并执行最大似然 （ML）确定第一和第二传输信号的频域信号以估计第一至第三符号。

    WIRELESS COMMUNICATION SYSTEM AND METHOD FOR PERFORMING COMMUNICATION IN THE WIRELESS COMMUNICATION SYSTEM
    9.
    发明申请
    WIRELESS COMMUNICATION SYSTEM AND METHOD FOR PERFORMING COMMUNICATION IN THE WIRELESS COMMUNICATION SYSTEM 有权
    无线通信系统和无线通信系统中通信的方法

    公开(公告)号：US20110176583A1

    公开(公告)日：2011-07-21

    申请号：US12849758

    申请日：2010-08-03

    申请人： Hyung-Jin Choi ,  Won-Jun Hwang ,  Se-Bin Im

    发明人： Hyung-Jin Choi ,  Won-Jun Hwang ,  Se-Bin Im

    IPC分类号： H04B7/14

    CPC分类号： H04B7/2606 ,  H04L1/0076 ,  H04L5/003

    摘要： Provided are a wireless communication system and a method of performing communication in the same. The wireless communication system includes a terminal configured to classify all subcarriers into a first group and a second group and allocate subcarriers of the first group to first symbols and subcarriers of the second group to the first symbols again to generate and transmit a first transmission signal, a base station configured to allocate the subcarriers of the first group to second symbols and the subcarriers of the second group to third symbols to generate and transmit a second transmission signal, and a relay configured to receive the first and second transmission signals and perform maximum likelihood (ML) determination of frequency domain signals of the first and second transmission signals to estimate the first to third symbols.

    摘要翻译： 提供一种无线通信系统和执行通信的方法。 无线通信系统包括终端，其被配置为将所有子载波分类为第一组和第二组，并且将第一组的子载波再次分配给第一组的第一符号和副载波，以再次产生并发送第一传输信号， 基站，被配置为将第一组的子载波分配给第二组的第二符号和第二组的子载波以分配给第三符号，以产生和发送第二传输信号;以及中继器，被配置为接收第一和第二传输信号并执行最大似然 （ML）确定第一和第二传输信号的频域信号以估计第一至第三符号。

    Method for demodulating received signals and apparatus for performing the same
    10.
    发明授权
    Method for demodulating received signals and apparatus for performing the same 有权
    解调接收信号的方法及其执行方法

    公开(公告)号：US08681903B2

    公开(公告)日：2014-03-25

    申请号：US13388848

    申请日：2010-08-04

    申请人： Hyung-Jin Choi ,  Young-Il Min ,  Se-Bin Im

    发明人： Hyung-Jin Choi ,  Young-Il Min ,  Se-Bin Im

    IPC分类号： H04L27/06

    CPC分类号： H04L27/0012

    摘要： Disclosed are a method for demodulating received signals and an apparatus therefore which can maintain quality of signals and can reduce computational complexity. A demodulation method of a receiving device for receiving a plurality of signals modulated through a M-ary (M is a natural number of 1 or more) modulation method includes: comparing channel frequency response power of a first channel with channel frequency response power of a second channel, selecting M reference signals on the basis of the compared result, selecting corresponding signals paired with respective selected M reference signals, and estimating transmitting signals from the M signal pairs including pairs of the reference signal and the corresponding signal. Accordingly, the computational complexity is reduced from O (M2) to O (M).

    摘要翻译： 公开了一种用于解调接收信号的方法以及因此可以保持信号质量并且可以降低计算复杂度的装置。 一种用于接收通过M进制调制的多个信号的接收装置的解调方法（M是1或更多的自然数）调制方法包括：将第一信道的信道频率响应功率与信道频率响应功率进行比较， 第二通道，基于比较结果选择M个参考信号，选择与各自选择的M个参考信号配对的相应信号，以及估计来自包括参考信号和相应信号对的M个信号对的发送信号。 因此，计算复杂度从O（M2）减少到O（M）。