公开(公告)号：US06937684B2

公开(公告)日：2005-08-30

申请号：US09970254

申请日：2001-10-02

申请人： Ching-Kae Tzou ,  Yung Ching Lin

发明人： Ching-Kae Tzou ,  Yung Ching Lin

IPC分类号： H03L7/085 ,  H04L27/00 ,  H04L27/38 ,  H03D3/24

CPC分类号： H03L7/085 ,  H04L27/3827 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0067

摘要： A differential phase discriminator includes a phase compensation circuit to compensate for timing drift and error for recovering timing information in a digital phase lock loop. The differential phase discriminator uses a differential phase detector to compute the phase difference of two consecutive frequency domain signal samples. The phase compensation circuit determines a phase correction term by computing the difference between the absolute values of the real and imaginary parts of a frequency domain signal sample. A weighting factor is computed by adjusting the sum of the absolute values of the real and imaginary parts of the frequency domain signal sample with a ratio adjustment factor. A phase compensation value is then computed by multiplying the phase correction term by the weighting factor. The phase compensation value is added to the uncorrected output of the differential phase detector.

摘要翻译： 差分鉴相器包括补偿定时漂移的相位补偿电路和用于恢复数字锁相环中的定时信息的误差。 差分鉴相器使用差分相位检测器来计算两个连续频域信号样本的相位差。 相位补偿电路通过计算频域信号样本的实部和虚部的绝对值之间的差来确定相位校正项。 通过调整频域信号样本的实部和虚部的绝对值之和与比率调整因子来计算加权系数。 然后通过将相位校正项乘以加权因子来计算相位补偿值。 相位补偿值被添加到差分相位检测器的未校正输出。

公开(公告)号：US20120128042A1

公开(公告)日：2012-05-24

申请号：US13115099

申请日：2011-05-24

申请人： Ching-Kae Tzou

发明人： Ching-Kae Tzou

IPC分类号： H04B1/38

CPC分类号： H04B3/54 ,  H04B2203/5416 ,  H04L5/16 ,  H04L27/2646

摘要： The present invention discloses a scattering-parameter estimation method for a transceiver of a half-duplex multicarrier communication system. The scattering-parameter estimation method includes steps of converting a first frequency-domain transmit signal to generate at least one symbol period of the first time-domain transmit signal; transmitting the first time-domain signal in a first specific time period; receiving and storing at least one symbol period of the first echoed signal of the first time-domain transmit signal in the first specific time period; converting at least one symbol period of the first echoed signal into a first frequency-domain echoed signal after a first transmission period; and estimating the S11 parameters corresponding to carriers respectively according to the first transmit signal and the first echoed signal.

摘要翻译： 本发明公开了一种用于半双工多载波通信系统的收发机的散射参数估计方法。 散射参数估计方法包括以下步骤：转换第一频域发射信号以产生第一时域发射信号的至少一个符号周期; 在第一特定时间段内发送所述第一时域信号; 在第一特定时间段内接收和存储第一时域发射信号的第一回波信号的至少一个符号周期; 在第一传输周期之后将第一回波信号的至少一个符号周期转换成第一频域回波信号; 以及分别根据第一发送信号和第一回波信号估计对应于载波的S11参数。

公开(公告)号：US20050053127A1

公开(公告)日：2005-03-10

申请号：US10883821

申请日：2004-07-06

申请人： Muh-Tian Shiue ,  Ching-Kae Tzou ,  Dong-Ming Chuang ,  Chih-Feng Wu

发明人： Muh-Tian Shiue ,  Ching-Kae Tzou ,  Dong-Ming Chuang ,  Chih-Feng Wu

IPC分类号： H03K5/159 ,  H04L25/03

CPC分类号： H04L25/03038 ,  H04L2025/03414 ,  H04L2025/03477 ,  H04L2025/03617

摘要： An equalizing device includes a first filter, a target filter, an error determining device coupled with the first filter and the target filter, and a coefficient processor coupled with the error determining device. The first filter has a first set of coefficients and processes input signals transmitted through a communication channel to reduce channel response. The target filter has a second set of coefficients and generates a target channel output. The error determining device then processes an output of the first filter and the target channel output to generate error signals. The coefficient processor maintains constant at least one coefficient of the first or the second sets of coefficients and updates the remaining coefficients of the first and the second sets of coefficients based on the error signals.

摘要翻译： 均衡装置包括第一滤波器，目标滤波器，与第一滤波器和目标滤波器耦合的误差确定装置，以及与误差确定装置耦合的系数处理器。 第一滤波器具有第一组系数并且处理通过通信信道发送的输入信号以减少信道响应。 目标滤波器具有第二组系数并且产生目标通道输出。 然后，误差确定装置处理第一滤波器和目标信道输出的输出以产生误差信号。 系数处理器保持恒定的第一或第二组系数的至少一个系数，并且基于误差信号更新第一和第二组系数的剩余系数。

公开(公告)号：US09077819B2

公开(公告)日：2015-07-07

申请号：US13316578

申请日：2011-12-12

申请人： Yuan-Hwa Li ,  Ching-Kae Tzou ,  Dong-Ming Chuang

发明人： Yuan-Hwa Li ,  Ching-Kae Tzou ,  Dong-Ming Chuang

IPC分类号： H04B7/00 ,  H04M11/06 ,  H04L25/02

CPC分类号： H04M11/062 ,  H04L25/0202

摘要： The present invention discloses a transmission power control method for a communication system comprising a transmitter and a plurality of receivers. The transmitter is coupled to the plurality of receivers via a plurality of corresponding outgoing links. The transmission power control method comprising steps of each of the plurality of receivers performing channel estimation for each of the plurality of corresponding outgoing links, and replying a first suggested transmission power back-off level to the transmitter; and the transmitter determining a new transmission power back-off level after collecting a plurality of first suggested transmission power back-off levels from the plurality of receivers.

摘要翻译： 本发明公开了一种包括发射机和多个接收机的通信系统的发射功率控制方法。 发射机经由多个对应的出站链路耦合到多个接收机。 所述发射功率控制方法包括以下步骤：所述多个接收机中的每一个对所述多个对应的出站链路中的每一个执行信道估计，并向所述发射机回复第一建议的发射功率回退电平; 并且所述发射机在从所述多个接收机收集多个第一建议的发射功率回退电平之后确定新的发射功率回退电平。

公开(公告)号：US07020155B2

公开(公告)日：2006-03-28

申请号：US09964478

申请日：2001-09-28

申请人： Ching-Kae Tzou ,  Shih-Chung Yin ,  Shuenn-Ren Liu ,  Min-Chieh Chen

发明人： Ching-Kae Tzou ,  Shih-Chung Yin ,  Shuenn-Ren Liu ,  Min-Chieh Chen

IPC分类号： H04L12/413

CPC分类号： H04L12/413 ,  H04L2012/40247

摘要： A collision detection method for a multiple access communication system is disclosed. By using the error term of a time-domain equalized signal as a detection source, an operation on the error term can be performed to determine whether collision occurs. For example, the mean square error and/or maximum value of the real part and/or imaginary part of the error term can be calculated or selected to distinguish the collision and non-collision situations. A collision detection apparatus for a multiple access communication system is also disclosed. The collision detection apparatus utilizes an existent adaptive equalizer and signal processing device for obtaining received information data bits to obtain the error term. The error term is further processed by a mean-square-error or maximum-absolute-value operator to determine the collision status.

公开(公告)号：US06810076B1

公开(公告)日：2004-10-26

申请号：US09611674

申请日：2000-07-07

申请人： Song-Nien Tang ,  Ching-Kae Tzou

发明人： Song-Nien Tang ,  Ching-Kae Tzou

IPC分类号： H04B140

CPC分类号： H04B3/23 ,  H04B3/238

摘要： Architecture of an efficient adaptive digital echo canceller includes a frequency domain update block, a far-end signal estimation block and a time domain echo cancellation block. The echo canceller has a training mode in which the frequency domain update block and far-end signal estimation block are first trained to estimate the echo channel and target channel. After the training mode, the time domain echo cancellation block uses the estimated echo channel to synthesize an echo replica and subtracted it from the received signal continuously before or in an operation mode. When a synchronization frame is received in the operation mode, the frequency domain update block and the far-end signal estimation block are used to retune both echo channel and target channel for improving system performance.

摘要翻译： 高效自适应数字回声消除器的结构包括频域更新块，远端信号估计块和时域回波消除块。 回波消除器具有训练模式，其中首先训练频域更新块和远端信号估计块以估计回波信道和目标信道。 在训练模式之后，时域回波消除块使用估计的回波信道来合成回波复制，并在操作模式之前或操作模式下从接收信号中减去它。 当在操作模式中接收到同步帧时，使用频域更新块和远端信号估计块来重新调谐回波信道和目标信道以提高系统性能。

公开(公告)号：US20110228838A1

公开(公告)日：2011-09-22

申请号：US12725585

申请日：2010-03-17

申请人： Shu-Fa Yang ,  Min-Chieh Chen ,  Ching-Kae Tzou

发明人： Shu-Fa Yang ,  Min-Chieh Chen ,  Ching-Kae Tzou

IPC分类号： H04L27/01

CPC分类号： H04L25/03012 ,  H04B3/23 ,  H04L25/03159 ,  H04L27/2657 ,  H04L27/2675 ,  H04L2027/0067

摘要： An apparatus for noise mitigation in a multi-carrier communication system includes a filter to receive a signal from an analog front end, a time-domain equalizer (TEQ) coupled with the filter, a fast Fourier transform (FFT) module, a frequency-domain equalizer (FEQ) coupled with the FFT module, a slicer to serve as a decision device, and a controller to calculate a power of signal at at least one of an input of the filter, an input of the TEQ, an output of the TEQ, an output of the FFT module, an output of the FEQ or an output of the slicer and compare at least one of the power of the at least one signal with a respective threshold so as to determine whether impulse noise occurs, wherein the controller is configured to disable adaptation of system parameters in at least one of the FEQ, a phase-lock loop (PLL) or a digital echo canceller (DEC) when impulse noise is detected.

摘要翻译： 一种用于多载波通信系统中的噪声抑制的装置，包括用于从模拟前端接收信号的滤波器，与滤波器耦合的时域均衡器（TEQ），快速傅里叶变换（FFT）模块， 与FFT模块耦合的域均衡器（FEQ），用作决策设备的限幅器，以及控制器，用于计算滤波器的输入，TEQ的输入， TEQ，FFT模块的输出，FEQ的输出或限幅器的输出，并将至少一个信号的功率中的至少一个与相应的阈值进行比较，以便确定是否发生脉冲噪声，其中控制器 被配置为在检测到脉冲噪声时禁用FEQ，锁相环（PLL）或数字回声消除器（DEC）中的至少一个中的系统参数的适配。

公开(公告)号：US20110228836A1

公开(公告)日：2011-09-22

申请号：US12725592

申请日：2010-03-17

申请人： Shu-Fa Yang ,  Min-Chieh Chen ,  Ching-Kae Tzou

发明人： Shu-Fa Yang ,  Min-Chieh Chen ,  Ching-Kae Tzou

IPC分类号： H03H7/40

CPC分类号： H04L27/2657 ,  H04B3/235 ,  H04J11/0066 ,  H04L25/03019 ,  H04L25/03159 ,  H04L27/2675 ,  H04L2025/03414 ,  H04L2025/03535

摘要： A method of noise mitigation in a multi-carrier communication system includes receiving a signal from a decision device, determining whether synchronization symbol update is enabled, updating at least one of frequency-domain equalizer (FEQ) coefficients or digital echo canceller (DEC) coefficients in synchronization symbol periods if the synchronization symbol update is enabled, determining whether data symbol update is performed if the synchronization symbol update is not enabled, determining whether a flag associated with the signal is set if the data symbol update is not performed, and updating at least one of FEQ or DEC coefficients associated with the signal in synchronization symbol periods if the flag is set.

摘要翻译： 一种多载波通信系统中的噪声抑制方法包括从判决装置接收信号，确定是否启用同步符号更新，更新频域均衡器（FEQ）系数或数字回声消除器（DEC）系数中的至少一个系数 如果同步符号更新被使能，则确定在不启用同步符号更新的情况下是否执行数据符号更新，如果未执行数据符号更新，则确定与该信号相关联的标志是否被设置，并且在 如果标志被设置，则与同步符号周期中的信号相关联的FEQ或DEC系数中的至少一个。

公开(公告)号：US06914942B2

公开(公告)日：2005-07-05

申请号：US09849309

申请日：2001-05-07

申请人： Shang-Ho Tsai ,  Hsien-Chun Huang ,  Ching-Kae Tzou

发明人： Shang-Ho Tsai ,  Hsien-Chun Huang ,  Ching-Kae Tzou

IPC分类号： H04L27/26 ,  H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2608

摘要： A method and an apparatus are provided in this invention to select an optimal swapping technique in discrete multi-tone system. The algorithm for performing gain-swapping is also proposed in the present invention. A swapping technique is selected from gain-swapping and a combination of bit-swapping and gain-swapping based on two index values such that the difference between the maximum mean square error (MSEmax) and the minimum mean square error (MSEmin) is minimized and the gain factor constraints are met. The first index value I is representative of range of improvement when adopting the gain-swapping as the swapping technique, and the second index value J is representative of range of improvement when adopting a combination of the gain-swapping and the bit-swapping as the swapping technique.

摘要翻译： 本发明提供了一种在离散多音系统中选择最佳交换技术的方法和装置。 用于执行增益交换的算法也在本发明中被提出。 交换技术从增益交换和基于两个索引值的位交换和增益交换的组合中选择，使得最大均方误差（MSE 最大值）与最小均方误差 平方误差（MSE分钟）最小化，并且满足增益因子约束。 当采用增益交换作为交换技术时，第一指标值I表示改进的范围，并且当采用增益交换和位交换的组合时，第二指标值J表示改进的范围，作为 交换技术

公开(公告)号：US06721365B1

公开(公告)日：2004-04-13

申请号：US09551450

申请日：2000-04-18

申请人： Shih-chung Yin ,  Ching-kae Tzou

发明人： Shih-chung Yin ,  Ching-kae Tzou

IPC分类号： H04L512

CPC分类号： H04L7/042

摘要： A receiver in a home phone-lines local area network system is proposed. The receiver can distinguish a valid signal and a collision backoff signal from noises in real time. The receiver for a home phone-lines LAN system comprises a QAM demodulator, an equalizer, a deconstellation, and a transmission data reading device. The receiver further comprises a signal match filter module and a detector. The signal match filter module comprises an adder and at least a cross-correlator. The adder adds the “I” signal and “Q” signal outputted from the QAM demodulator and outputs a combined signal. The cross-correlator performs match operation, such as a comparison operation or a correlation operation, of the combined signal and an identification value and outputs a match value to the detector. Since the signal match filter module connects directly to the output of QAM demodulator, it can immediately identify the identification code TRN16 contained in the received signal. The detector compares the match value with a threshold value and determines whether the received signal frame is a collision backoff signal frame or a valid signal frame. When continuous identification codes TRN16 are detected, the received signal frame is a valid signal frame; whereas when a single identification code TRN16 is detected, the received signal frame is a collision backoff signal frame.

摘要翻译： 提出了家庭电话线路局域网系统中的接收机。 接收机可以实时地从噪声中区分有效的信号和碰撞退避信号。 用于家用电话线LAN系统的接收机包括QAM解调器，均衡器，解密星和传输数据读取装置。 接收机还包括信号匹配滤波器模块和检测器。 信号匹配滤波器模块包括加法器和至少一个互相关器。 加法器将从QAM解调器输出的“I”信号和“Q”信号相加，并输出组合信号。 交叉相关器执行组合信号和识别值的匹配操作，例如比较操作或相关操作，并将匹配值输出到检测器。 由于信号匹配滤波器模块直接连接到QAM解调器的输出，因此可以立即识别接收信号中包含的识别码TRN16。 检测器将匹配值与阈值进行比较，并确定接收到的信号帧是否为冲突退避信号帧或有效信号帧。 当检测到连续识别码TRN16时，接收到的信号帧是有效的信号帧; 而当检测到单个识别码TRN16时，接收到的信号帧是一个碰撞退避信号帧。