公开(公告)号：US08130852B2

公开(公告)日：2012-03-06

申请号：US12345936

申请日：2008-12-30

Applicant: Hyung-Jin Choi ,  Se-Bin Im

Inventor： Hyung-Jin Choi ,  Se-Bin Im

IPC: H04L27/28

CPC classification number: H04L25/0208 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03611

Abstract: Disclosed is a radio communication device, and more particularly to a method for estimating a channel and compensating for error occurring in the estimation procedure, for a device for performing a frequency domain signal processing, such as Orthogonal Frequency Division Multiplexing (OFDM) The channel estimation method in a radio communication system includes the steps of: transforming a received OFDM signal into a frequency domain; estimating a channel frequency response (CFR) value from a result value obtained through the transformation by using a pilot signal; transforming the estimated CFR value into a time domain through an extended Inverse Fast Fourier Transform scheme, and detecting a channel impulse response (CIR) value; detecting a delay path position of a channel; modifying a non-ideal autocorrelation function; and compensating the estimated CIR value for error, through use of the detected delay path position and the non-ideal autocorrelation function.

Abstract translation: 公开了一种无线电通信装置，更具体地，涉及用于估计信道并补偿估计过程中出现的误差的方法，用于执行频域信号处理的装置，例如正交频分复用（OFDM）信道估计 无线电通信系统中的方法包括以下步骤：将接收到的OFDM信号变换为频域; 通过使用导频信号从通过变换获得的结果值估计信道频率响应（CFR）值; 通过扩展的快速傅立叶逆变换方案将估计的CFR值变换为时域，并检测信道脉冲响应（CIR）值; 检测通道的延迟路径位置; 修改非理想自相关函数; 并通过使用检测到的延迟路径位置和非理想自相关函数来补偿估计的CIR误差值。

公开(公告)号：US20110167321A1

公开(公告)日：2011-07-07

申请号：US12809392

申请日：2008-02-29

Applicant: Sung-Hyun Hwang ,  Jung Sun Um ,  Myung Sun Song ,  Chang-Joo Kim ,  Se-Bin Im ,  Tae-Woong Yoon ,  Hyung-Jin Choi

Inventor： Sung-Hyun Hwang ,  Jung Sun Um ,  Myung Sun Song ,  Chang-Joo Kim ,  Se-Bin Im ,  Tae-Woong Yoon ,  Hyung-Jin Choi

IPC: H04L27/28 ,  H04B17/00 ,  H03M13/23 ,  G06F11/10

CPC classification number: H04L5/0051 ,  H04L25/0224 ,  H04L25/03292 ,  H04L27/2613 ,  H04L27/2647

Abstract: A data transmitter and receiver for improving a data rate, and more particularly, to an apparatus and method of transmitting and receiving an orthogonal frequency division multiplexing (OFDM) symbol in which a pilot signal is added to a data signal is provided. The apparatus includes a transmitter including: a pilot adder to add a pilot signal to a data signal; and a guard interval inserting unit to insert a guard interval to the data signal with the added pilot signal, and a receiver including: a guard interval removal unit to remove a guard interval in a received time domain signal; a fast Fourier transform (FFT) unit to transform the time domain signal in which the guard interval is removed to a frequency domain signal; a channel estimator to estimate a channel value from the time domain signal in which the guard interval is removed; an equalizer to equalize the frequency domain signal based on the estimated channel value; and a pilot signal removal unit to remove the pilot signal in the equalized frequency domain signal.

Abstract translation: 提供了一种用于提高数据速率的数据发送器和接收器，更具体地，涉及一种发送和接收其中向数据信号添加导频信号的正交频分复用（OFDM）符号的装置和方法。 该装置包括：发射机，包括：导频加法器，用于将导频信号加到数据信号上; 以及保护间隔插入单元，用于利用所附加的导频信号向所述数据信号插入保护间隔;以及接收机，包括：保护间隔去除单元，用于去除所接收的时域信号中的保护间隔; 快速傅立叶变换（FFT）单元，用于将保护间隔被去除的时域信号变换为频域信号; 信道估计器，用于从保护间隔被去除的时域信号中估计信道值; 均衡器，用于基于估计的信道值来均衡频域信号; 以及导频信号去除单元，用于去除均衡的频域信号中的导频信号。

公开(公告)号：US20100158094A1

公开(公告)日：2010-06-24

申请号：US12492488

申请日：2009-06-26

Applicant: Jin Yong Kang ,  Hyung Jin Choi ,  Se Bin Im ,  Kyung Doc Jang

Inventor： Jin Yong Kang ,  Hyung Jin Choi ,  Se Bin Im ,  Kyung Doc Jang

IPC: H04B1/10 ,  H03H7/30

CPC classification number: H04L25/0204 ,  H04L25/0242 ,  H04L25/03159 ,  H04L25/03821 ,  H04L27/2647 ,  H04L2025/0342

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20100142632A1

公开(公告)日：2010-06-10

申请号：US12477269

申请日：2009-06-03

Applicant: Bon Young Koo ,  Hyung Jin Choi ,  Se Bin Im ,  Jung In Kim

Inventor： Bon Young Koo ,  Hyung Jin Choi ,  Se Bin Im ,  Jung In Kim

IPC: H04L27/28

CPC classification number: H04L27/2657 ,  H04L27/2676 ,  H04L27/2688

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20090168908A1

公开(公告)日：2009-07-02

申请号：US12193494

申请日：2008-08-18

Applicant: Hyun Suk LEE ,  Se Bin Im ,  Je Hyuk Ryu ,  Jae Goon Aum ,  Jung Tae Kim ,  Hyung Jin Choi

Inventor： Hyun Suk LEE ,  Se Bin Im ,  Je Hyuk Ryu ,  Jae Goon Aum ,  Jung Tae Kim ,  Hyung Jin Choi

IPC: H04L27/28

CPC classification number: H04L25/022 ,  H04L25/0212 ,  H04L25/023 ,  H04L27/2647

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20070280363A1

公开(公告)日：2007-12-06

申请号：US11445735

申请日：2006-06-01

Applicant: Se Bin Im ,  Jong Hyeon Park ,  Je Woo Kim ,  Hyung Jin Choi

Inventor： Se Bin Im ,  Jong Hyeon Park ,  Je Woo Kim ,  Hyung Jin Choi

IPC: H04K1/10

CPC classification number: H04L25/0212 ,  H04L5/0023 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/0232 ,  H04L27/2647

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20160212756A1

公开(公告)日：2016-07-21

申请号：US14978692

申请日：2015-12-22

Applicant: Se-Bin IM ,  Min-Goo KIM ,  Sung-Soo KIM ,  Chae-Hag YI

Inventor： Se-Bin IM ,  Min-Goo KIM ,  Sung-Soo KIM ,  Chae-Hag YI

IPC: H04W72/10 ,  H04W24/08 ,  H04W72/08

CPC classification number: H04W24/08 ,  H04W72/1247

Abstract: A method and apparatus for controlling a modem of a user equipment (UE) in a wireless communication system is provided. The method includes generating at least one modem control information determined based on information related to a wireless communication environment, when at least a portion of the wireless communication environment is changed, updating a priority stored in a database of the UE based on the changed wireless communication environment and controlling the modem of the UE using the priority-updated modem control information.

Abstract translation: 提供了一种用于在无线通信系统中控制用户设备（UE）的调制解调器的方法和装置。 该方法包括：当无线通信环境的至少一部分改变时，基于与无线通信环境相关的信息确定的至少一个调制解调器控制信息，基于改变的无线通信更新存储在UE的数据库中的优先级 环境，并使用优先级更新的调制解调器控制信息来控制UE的调制解调器。

公开(公告)号：US20090196383A1

公开(公告)日：2009-08-06

申请号：US12363484

申请日：2009-01-30

Applicant: Hee-Jin ROH ,  Jeoung-Gil LEE ,  Su-Jin YOON ,  Hoon KANG ,  Chang-Hyun BAIK ,  Jun-Kyu KANG ,  Hyung-Jin CHOI ,  Se-Bin IM ,  Dae-Hong LEE

Inventor： Hee-Jin ROH ,  Jeoung-Gil LEE ,  Su-Jin YOON ,  Hoon KANG ,  Chang-Hyun BAIK ,  Jun-Kyu KANG ,  Hyung-Jin CHOI ,  Se-Bin IM ,  Dae-Hong LEE

IPC: H04L27/06

CPC classification number: H04L27/2688 ,  H04L27/2659 ,  H04L27/2672 ,  H04L27/2675

Abstract: A correlation apparatus and method for frequency synchronization are provided. A frequency synchronization method of a receiver in a broadband wireless access communication system includes acquiring a highest correlation value by conducting a differential correlation of a variable interval between a received signal and a reference signal and performing a frequency synchronization according to the highest correlation value.

Abstract translation: 提供了一种用于频率同步的相关装置和方法。 宽带无线接入通信系统中的接收机的频率同步方法包括通过对接收信号和参考信号进行可变间隔的差分相关，并根据最高相关值进行频率同步来获取最高相关值。