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：US20050008088A1

公开(公告)日：2005-01-13

申请号：US10885186

申请日：2004-07-06

申请人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

IPC分类号： H04L27/26 ,  H04K1/10

CPC分类号： H04L27/2662 ,  H04L27/2605 ,  H04L27/2675 ,  H04L27/2678

摘要： A symbol boundary detection device and a method thereof for use in a receiver of a multi-channel communication system. The device utilizes a threshold to make an auxiliary judgement so as to select a proper symbol boundary reference point within an early range. The threshold may be flexibly set in response to different characteristics of the systems. In addition, a pilot symbol guard interval matched filter is further utilized to determine whether a pilot symbol guard interval is received.

摘要翻译： 一种在多声道通信系统的接收机中使用的符号边界检测装置及其方法。 设备利用阈值进行辅助判断，以便在早期范围内选择适当的符号边界参考点。 可以响应于系统的不同特性灵活地设置阈值。 此外，进一步利用导频符号保护间隔匹配滤波器来确定是否接收到导频符号保护间隔。

公开(公告)号：US07212795B2

公开(公告)日：2007-05-01

申请号：US10864193

申请日：2004-06-09

申请人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

IPC分类号： H04B1/06

CPC分类号： H03G3/3052 ,  H03G2201/206 ,  H03G2201/302 ,  H03G2201/305 ,  H03G2201/307 ,  H03G2201/502 ,  H03G2201/508 ,  H03M1/185 ,  H04B7/0814

摘要： The invention provides an automatic gain control and antenna selection method used in a receiver of a radio communication system. The received signal power is estimated by digital signal processing after analog-to-digital conversion in the system, in order to adjust the gain of the front end analog signal until the magnitude of the analog signal is adjusted to an optimum range of the digital signal processing. In addition, the ADC is utilized to estimate the signal power as the basis of the antenna selection.

摘要翻译： 本发明提供一种在无线电通信系统的接收机中使用的自动增益控制和天线选择方法。 接收到的信号功率通过系统中模数转换后的数字信号处理来估计，以便调整前端模拟信号的增益，直到模拟信号的幅度被调整到数字信号的最佳范围 处理。 此外，ADC用于估计信号功率作为天线选择的基础。

公开(公告)号：US07391828B2

公开(公告)日：2008-06-24

申请号：US10885186

申请日：2004-07-06

申请人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

IPC分类号： H04L27/06

CPC分类号： H04L27/2662 ,  H04L27/2605 ,  H04L27/2675 ,  H04L27/2678

摘要： A symbol boundary detection device and a method thereof for use in a receiver of a multi-channel communication system. The device utilizes a threshold to make an auxiliary judgement so as to select a proper symbol boundary reference point within an early range. The threshold may be flexibly set in response to different characteristics of the systems. In addition, a pilot symbol guard interval matched filter is further utilized to determine whether a pilot symbol guard interval is received.

摘要翻译： 一种在多声道通信系统的接收机中使用的符号边界检测装置及其方法。 设备利用阈值进行辅助判断，以便在早期范围内选择适当的符号边界参考点。 可以响应于系统的不同特性灵活地设置阈值。 此外，进一步利用导频符号保护间隔匹配滤波器来确定是否接收到导频符号保护间隔。

公开(公告)号：US07215266B2

公开(公告)日：2007-05-08

申请号：US10851307

申请日：2004-05-21

申请人： Kuangyu Li ,  Song-Nien Tang ,  Jackie K. Cheng ,  Zaw Min Soe

发明人： Kuangyu Li ,  Song-Nien Tang ,  Jackie K. Cheng ,  Zaw Min Soe

IPC分类号： H03M1/06

CPC分类号： H03M1/1019 ,  H03M1/18

摘要： Systems and methods for canceling static and dynamic DC offsets by combining a digital DC offset correction scheme with an analog DC offset correction scheme. A feedback-based digital DC offset correction scheme provides different adjustment levels for a plurality of discrete gain states and the analog DC offset correction scheme operates in different cancellation modes dependent on a frame structure. A digital DC offset correction scheme collects DC offset control information and provides adjustment levels. In addition, a negative-feedback based switchable high pass filter has a plurality modes of operation, where one mode of operation includes an all-pass filter.

摘要翻译： 通过组合数字直流偏移校正方案和模拟直流偏移校正方案来消除静态和动态直流偏移的系统和方法。 基于反馈的数字DC偏移校正方案为多个离散增益状态提供不同的调整电平，并且模拟DC偏移校正方案根据帧结构在不同的取消模式下操作。 数字DC偏移校正方案收集直流偏移控制信息并提供调整电平。 此外，基于负反馈的可切换高通滤波器具有多种操作模式，其中一种操作模式包括全通滤波器。

公开(公告)号：US20050258989A1

公开(公告)日：2005-11-24

申请号：US10851307

申请日：2004-05-21

申请人： Kuangyu Li ,  Song-Nien Tang ,  Jackie Cheng ,  Zaw Soe

发明人： Kuangyu Li ,  Song-Nien Tang ,  Jackie Cheng ,  Zaw Soe

IPC分类号： H03M1/06 ,  H03M1/10 ,  H03M1/18

CPC分类号： H03M1/1019 ,  H03M1/18

摘要： Systems and methods for canceling static and dynamic DC offsets by combining a digital DC offset correction scheme with an analog DC offset correction scheme. A feedback-based digital DC offset correction scheme provides different adjustment levels for a plurality of discrete gain states and the analog DC offset correction scheme operates in different cancellation modes dependent on a frame structure. A digital DC offset correction scheme collects DC offset control information and provides adjustment levels. In addition, a negative-feedback based switchable high pass filter has a plurality modes of operation, where one mode of operation includes an all-pass filter.

摘要翻译： 通过组合数字直流偏移校正方案和模拟直流偏移校正方案来消除静态和动态直流偏移的系统和方法。 基于反馈的数字DC偏移校正方案为多个离散增益状态提供不同的调整电平，并且模拟DC偏移校正方案根据帧结构在不同的取消模式下操作。 数字DC偏移校正方案收集直流偏移控制信息并提供调整电平。 此外，基于负反馈的可切换高通滤波器具有多种操作模式，其中一种操作模式包括全通滤波器。