公开(公告)号：US06964007B2

公开(公告)日：2005-11-08

申请号：US10215201

申请日：2002-08-09

申请人： Jung-Hyun Lee ,  Seok-Jun Ko ,  Pan-Soo Kim ,  Hyung-Jin Choi

发明人： Jung-Hyun Lee ,  Seok-Jun Ko ,  Pan-Soo Kim ,  Hyung-Jin Choi

IPC分类号： G11B20/18 ,  G11B20/10 ,  H04L7/033 ,  H04L25/06 ,  G06F11/00 ,  H03M13/03

CPC分类号： G11B20/10203 ,  G11B20/10037 ,  G11B20/10222 ,  H04L7/0334 ,  H04L25/069

摘要： An asymmetric error correction apparatus and method, and clock recovering apparatus and data recovering apparatus for a system for reading data from an optical recording medium such as a CD or DVD that has a multi-level input signal and irregular characteristic of zero-crossing transition. The signal inputted from the optical recording medium is digitized, and a zero-crossing detector extracts four sequential samples and detects a zero-crossing point from the two intermediate samples. An asymmetric error detector judges an asymmetric state and asymmetric polarity of the digital signal from a sum of the two side samples among the four samples if the zero-crossing point is detected. A correction section accumulates the judged asymmetric polarities, judges an asymmetric error of the digital signal if the accumulated value exceeds a predetermined threshold, and corrects the asymmetric error of the read signal caused by an inaccurate pit length.

摘要翻译： 一种不对称误差校正装置和方法，以及用于从具有多电平输入信号和不均匀过零转换特性的诸如CD或DVD的光记录介质读取数据的系统的时钟恢复装置和数据恢复装置。 从光记录介质输入的信号被数字化，并且过零检测器提取四个连续采样并检测来自两个中间采样的过零点。 如果检测到过零点，则不对称误差检测器从四个样本中的两个侧样本的和来判断数字信号的不对称状态和非对称极性。 如果累积值超过预定阈值，则校正部分累积所判断的非对称极性，判断数字信号的不对称误差，并校正由不准确的凹坑长度引起的读取信号的不对称误差。

公开(公告)号：US06750725B2

公开(公告)日：2004-06-15

申请号：US10190600

申请日：2002-07-09

申请人： Jae-Wook Lee ,  Seok-Jun Ko ,  Pan-Soo Kim ,  Hyung-Jin Choi

发明人： Jae-Wook Lee ,  Seok-Jun Ko ,  Pan-Soo Kim ,  Hyung-Jin Choi

IPC分类号： H03L700

CPC分类号： H03L7/091 ,  H03D13/003

摘要： An apparatus for detecting a phase error for a system such as a CD or a DVD having a multi-level input signal with an irregular zero crossing shift, and a phase locked loop circuit using the same. An A/D converter digitizes a signal read from the CD or the DVD. A phase error detect unit detects a zero crossing of the digital signal consecutively input from the A/D converter, and detects a timing error from a signal corresponding to the detected zero crossing. An error correction unit corrects a sampling timing error of the A/D converter by shifting a phase corresponding to the timing error input from the phase error detect unit. An apparatus for detecting a timing error having a tracking function reduces the amount of normal jitter and a dispersion value of the timing error in accordance with a signal to noise ratio.

摘要翻译： 一种用于检测诸如具有不规则过零点偏移的多电平输入信号的CD或DVD的系统的相位误差的装置，以及使用其的锁相环电路。 A / D转换器将从CD或DVD读取的信号数字化。 相位误差检测单元检测从A / D转换器连续输入的数字信号的过零点，并根据检测到的过零点的信号检测定时误差。 误差校正单元通过移位与从相位误差检测单元输入的定时误差相对应的相位来校正A / D转换器的采样定时误差。 用于检测具有跟踪功能的定时误差的装置根据信噪比减少正常抖动的量和定时误差的色散值。

公开(公告)号：US06577674B1

公开(公告)日：2003-06-10

申请号：US09390117

申请日：1999-09-03

申请人： Seok-Jun Ko ,  Kyung-Ha Lee ,  Hyung-Jin Choi

发明人： Seok-Jun Ko ,  Kyung-Ha Lee ,  Hyung-Jin Choi

IPC分类号： H04B1500

CPC分类号： H04L25/0214 ,  H04B1/7115 ,  H04L25/0204

摘要： A channel compensator for estimating and for compensating a phase change and a residual frequency offset of a despreaded signal, prior to synchronous demodulation in a DS-CDMA receiver. In the channel compensator, a first integrator accumulates input signals sampled at a given chip rate for a predetermined period and multiplies the accumulated value by a given gain. A shift register having a plurality of registers shifts the data output from the first integrator. A second integrator integrates the data generated at once from the respective registers of the shift register. A delay means delays the input signal for a predetermined time, and a multiplier multiplies the delayed input signal by an output of the second integrator in order to generate the compensated signal. The delay device delays the input signal by a time required for the input signal to reach a central register of the shift register through the first integrator. The second integrator includes a summer means for summing the values of the respective registers of the shift register at an update period of the first integrator, and a multiplier for multiplying a value output from the summer means by a reciprocal number of the number of the registers to reduce the dispersion of an estimation value due to noises, and for adjusting a bit value for detected information.

摘要翻译： 信道补偿器，用于在DS-CDMA接收机中的同步解调之前估计和补偿解扩信号的相位变化和残余频率偏移。 在信道补偿器中，第一积分器以预定周期累积以给定码片速率采样的输入信号，并将累加值乘以给定增益。 具有多个寄存器的移位寄存器使从第一积分器输出的数据移位。 第二积分器将从移位寄存器的各个寄存器一次产生的数据进行积分。 延迟装置将输入信号延迟预定时间，并且乘法器将延迟的输入信号乘以第二积分器的输出，以产生补偿信号。 延迟装置将输入信号延迟输入信号所需的时间通过第一积分器到达移位寄存器的中心寄存器。 第二积分器包括用于在第一积分器的更新周期处对移位寄存器的各个寄存器的值相加的加法器，以及用于将从加法器装置输出的值乘以寄存器数目的倒数的乘法器 以减少由于噪声引起的估计值的偏差，并且用于调整检测信息的位值。

公开(公告)号：US5751734A

公开(公告)日：1998-05-12

申请号：US742663

申请日：1996-11-04

申请人： Hyung-Jin Choi ,  Sung-Bae Cho ,  Suk-Jin Jung ,  Hyung-Kil Lee

发明人： Hyung-Jin Choi ,  Sung-Bae Cho ,  Suk-Jin Jung ,  Hyung-Kil Lee

IPC分类号： H03M13/41 ,  G06F11/10

CPC分类号： H03M13/4161

摘要： A decoding apparatus for decoding input data using a Viterbi algorithm includes a first unit for repetitively performing determination of a survivor path corresponding to each state at each time unit based on the input data and a Trellis diagram, and for generating decision vectors and path number information whenever a branch path is determined. A second unit is provided for storing the decision vectors generated in the first unit and for outputting path information representing each survivor path determined by the stored decision vectors. A third unit stores the path number information output from the first unit and the path information output from the second unit, and deletes the branch path information corresponding to the path number information of the first unit from the stored path information, while retracing the previous states during the time when the branch path to be deleted does not overlap the other survivor path having a branch path connected to the next state. The third unit generates decoded data corresponding to input data based on the finally remaining survivor path.

摘要翻译： 使用维特比算法解码输入数据的解码装置包括：第一单元，用于基于输入数据和网格图重复地执行与每个时间单位的每个状态对应的幸存路径的确定，并且用于生成决策向量和路径号信息 每当确定分支路径时。 第二单元被提供用于存储在第一单元中生成的判决向量，并且用于输出表示由存储的决策向量确定的每个幸存路径的路径信息。 第三单元存储从第一单元输出的路径号信息和从第二单元输出的路径信息，并且从所存储的路径信息中删除与所述第一单元的路径号信息对应的分支路径信息，同时还原先前状态 在要删除的分支路径不与具有连接到下一状态的分支路径的另一个幸存路径重叠的时间期间。 第三单元基于最终剩余的幸存路径生成与输入数据相对应的解码数据。

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。

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。

公开(公告)号：US07711041B2

公开(公告)日：2010-05-04

申请号：US11254855

申请日：2005-10-21

申请人： Joo-Hyun Do ,  Hyung-Jin Choi ,  Jung-Su Han ,  Jae-Bum Cho

发明人： Joo-Hyun Do ,  Hyung-Jin Choi ,  Jung-Su Han ,  Jae-Bum Cho

IPC分类号： H04B1/38 ,  H04L5/16

CPC分类号： H04B17/336

摘要： In a method of estimating a signal-to-interference ratio (SIR), a first average channel power per slot of a first channel that is under a fading environment is estimated. A second average channel power per slot of a second channel that is under a fading environment substantially the same as the first channel is estimated, wherein the first and second channels are multiplexed. A second signal power attenuation ratio of the second channel is calculated using the second average power per slot of the second channel. A third average power per slot of the first channel is calculated using the first average power per slot of the first channel and a reciprocal of the second signal power attenuation ratio of the second channel.

摘要翻译： 在估计信号干扰比（SIR）的方法中，估计处于衰落环境下的第一信道的每个时隙的第一平均信道功率。 估计在与第一信道基本相同的衰落环境下的第二信道的每时隙的第二平均信道功率，其中第一和第二信道被多路复用。 使用第二通道的每个槽的第二平均功率来计算第二通道的第二信号功率衰减比。 使用第一信道的每个时隙的第一平均功率和第二信道的第二信号功率衰减比的倒数来计算第一信道的每个时隙的第三平均功率。

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）。

公开(公告)号：US08130852B2

公开(公告)日：2012-03-06

申请号：US12345936

申请日：2008-12-30

申请人： Hyung-Jin Choi ,  Se-Bin Im

发明人： Hyung-Jin Choi ,  Se-Bin Im

IPC分类号： H04L27/28

CPC分类号： H04L25/0208 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03611

摘要： 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.

摘要翻译： 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

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

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

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

CPC分类号： H04L5/0051 ,  H04L25/0224 ,  H04L25/03292 ,  H04L27/2613 ,  H04L27/2647

摘要： 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.

摘要翻译： 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。