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1.发明授权公开(公告)号：US08275087B2
公开(公告)日：2012-09-25
申请号：US12339333
申请日：2008-12-19
IPC分类号： H03D3/24
CPC分类号： H03L7/087 , H04J3/0667
摘要： An endpoint or other communication device of a communication system includes a clock recovery module. The communication device is operative as a slave device relative to another communication device that is operative as a master device. The clock recovery module comprises a clock recovery loop configured to control a slave clock frequency of the slave device so as to synchronize the slave clock frequency with a master clock frequency of the master device. The clock recovery loop comprises a primary loop having a first frequency error estimator for generating a first estimate of error between the master and slave clock frequencies, a second frequency error estimator outside of the primary loop for generating a second estimate of error between the master and slave clock frequencies, and an accumulator coupled between the second frequency error estimator and the primary loop. The second estimate is controllably injected into the primary loop via the accumulator.
摘要翻译： 通信系统的端点或其他通信设备包括时钟恢复模块。 通信设备相对于作为主设备操作的另一通信设备而作为从设备操作。 时钟恢复模块包括时钟恢复环路，其被配置为控制从设备的从时钟频率，以使从时钟频率与主设备的主时钟频率同步。 时钟恢复环路包括具有第一频率误差估计器的主回路，该第一频率误差估计器用于产生主时钟频率与从时钟频率之间的误差的第一估计，在主回路外部的第二频率误差估计器，用于产生主机和 从时钟频率和耦合在第二频率误差估计器和主回路之间的累加器。 第二个估计可以通过蓄能器可控地注入主回路。
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2.发明授权System and method for predistorting a signal using current and past signal samples 失效使用当前和过去信号样本预失真信号的系统和方法公开(公告)号：US07269231B2
公开(公告)日：2007-09-11
申请号：US10159540
申请日：2002-05-31
CPC分类号： H03F1/3258 , H03F1/3247 , H03F2201/3233
摘要： A signal is predistorted by producing a set of sample values, each of at least a subset of which is dependent on (i) at least one of a plurality of past time spaced input samples and (ii) a current time spaced input sample, and independent of any other time spaced input sample, and combining the sample values to produce the predistorted signal. Predistortion circuitry for generating the predistorted signal may be implemented using multiple predistortion core circuits, with each of the predistortion core circuits receiving a data input and an index input associated with a particular input sample and generating a corresponding data output. The data outputs of the predistortion core circuits correspond generally to sample values. The predistortion circuitry may also include at least one memory finite impulse response (FIR) filter which processes one or more input samples in conjunction with the production of the sample values.
摘要翻译： 通过产生一组采样值来预测信号，其中至少一个子集取决于（i）多个过去时间间隔输入样本中的至少一个和（ii）当前时间间隔输入样本中的至少一个，以及 独立于任何其他时间间隔的输入采样，并组合采样值以产生预失真信号。 用于产生预失真信号的预失真电路可以使用多个预失真核心电路来实现，其中每个预失真核心电路接收与特定输入采样相关联的数据输入和索引输入并产生相应的数据输出。 预失真核心电路的数据输出一般对应于采样值。 预失真电路还可以包括至少一个存储器有限脉冲响应（FIR）滤波器，其结合样本值的产生来处理一个或多个输入样本。
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3.发明授权公开(公告)号：US06794939B2
公开(公告)日：2004-09-21
申请号：US10159629
申请日：2002-05-31
IPC分类号： H03F126
CPC分类号： H03F1/3258 , H03F2201/3209
摘要： A signal is predistorted by producing a first set of sample values using a first predistortion technique, producing a second set of sample values using a second predistortion technique different than the first predistortion technique, and combining the first and second sets of sample values to produce a predistorted signal. At least one of the first and second predistortion techniques produce the corresponding set of sample values based at least in part on a plurality of past time spaced input samples relative to a current time spaced input sample. By way of example, the first predistortion technique may be configured to produce sample output values each of which is dependent on one of a plurality of time spaced input samples and independent of any other time spaced input sample, and the second predistortion technique may be configured to produce sample output values each of which is dependent on (i) at least one of a plurality of past time spaced input samples and (ii) a current time spaced input sample, and independent of any other time spaced input sample.
摘要翻译： 通过使用第一预失真技术产生第一组采样值来预测信号，使用与第一预失真技术不同的第二预失真技术产生第二组采样值，并组合第一和第二组采样值以产生 预失真信号。 第一和第二预失真技术中的至少一个至少部分地基于相对于当前时间间隔输入样本的多个过去的时间间隔输入样本产生相应的样本值集合。 作为示例，第一预失真技术可以被配置为产生每个取决于多个时间间隔输入样本中的一个并且独立于任何其它时间间隔输入样本之一的样本输出值，并且第二预失真技术可以被配置 以产生每个样本输出值，其取决于（i）多个过去的时间间隔输入样本中的至少一个，以及（ii）当前时间间隔的输入样本，并且独立于任何其他时间间隔的输入样本。
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4.发明授权公开(公告)号：US09559871B2
公开(公告)日：2017-01-31
申请号：US11329375
申请日：2006-01-10
CPC分类号： H04L25/0204 , H04B7/0857 , H04L25/03343 , H04L2025/03414 , H04L2025/03426
摘要： A method and an apparatus for using a plurality of antennas to equalize a composite propagation channel of a wideband wireless communication is provided. The method comprises adjusting a corresponding weight associated with at least two of the plurality of antennas to obtain a channel response from the plurality of antennas over a composite propagation channel. The method further comprises equalizing the channel response of the composite propagation channel over a given bandwidth based on the corresponding weights for the wireless communication over a wideband frequency range. By adjusting a complex weight associated with each of the set of transmit antennas, a wireless communication system may obtain a channel response from the plurality of antennas over the composite propagation channel. In this way, the wireless communication system may combine multiple antenna signals from the set of transmit antennas with the complex weights to provide an overall transfer function that is substantially flat over a given bandwidth.
摘要翻译： 提供了一种使用多个天线来均衡宽带无线通信的复合传播信道的方法和装置。 该方法包括调整与多个天线中的至少两个天线相关联的对应权重，以通过复合传播信道从多个天线获得信道响应。 该方法还包括基于用于宽带频率范围上的无线通信的相应权重，在给定带宽上均衡复合传播信道的信道响应。 通过调整与每组发射天线相关联的复权，无线通信系统可以通过复合传播信道从多个天线获得信道响应。 以这种方式，无线通信系统可以组合来自发射天线组的多个天线信号与复权重，以提供在给定带宽上基本平坦的总体传递函数。
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5.发明授权Method, apparatus and system for frequency synchronization between devices communicating over a packet network 有权用于通过分组网络通信的设备之间的频率同步的方法，装置和系统公开(公告)号：US08300749B2
公开(公告)日：2012-10-30
申请号：US12339318
申请日：2008-12-19
IPC分类号： H04L7/00
CPC分类号： H03L7/085 , H03L7/087 , H04J3/0664 , H04J3/0667
摘要： An endpoint or other communication device of a communication system includes a clock recovery module. The communication device is operative as a slave device relative to another communication device that is operative as a master device. The clock recovery module comprises a clock recovery loop configured to control a slave clock frequency of the slave device so as to synchronize the slave clock frequency with a master clock frequency of the master device. The clock recovery loop utilizes a frequency error estimator implemented as a maximum-likelihood estimator with slope fitting based on a sequence of arrival timestamps, and a loop filter implemented as a series combination of an adaptive-bandwidth filter and a proportional-integral controller. The clock recovery module may further comprise a discontinuity detector configured to detect a discontinuity in delays of respective timing messages, and a loop controller operative to place the clock recovery loop in a particular state responsive to detection of the discontinuity.
摘要翻译： 通信系统的端点或其他通信设备包括时钟恢复模块。 通信设备相对于作为主设备操作的另一通信设备而作为从设备操作。 时钟恢复模块包括时钟恢复环路，其被配置为控制从设备的从时钟频率，以使从时钟频率与主设备的主时钟频率同步。 时钟恢复环路利用被实现为基于到达时间序列的斜率拟合的最大似然估计器的频率误差估计器，以及实现为自适应带宽滤波器和比例积分控制器的串联组合的环路滤波器。 时钟恢复模块还可以包括不连续检测器，其被配置为检测相应定时消息的延迟的不连续性，以及循环控制器，用于响应于不连续性的检测将时钟恢复环置于特定状态。
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6.发明申请公开(公告)号：US20100158183A1
公开(公告)日：2010-06-24
申请号：US12339333
申请日：2008-12-19
IPC分类号： H04L7/00
CPC分类号： H03L7/087 , H04J3/0667
摘要： An endpoint or other communication device of a communication system includes a clock recovery module. The communication device is operative as a slave device relative to another communication device that is operative as a master device. The clock recovery module comprises a clock recovery loop configured to control a slave clock frequency of the slave device so as to synchronize the slave clock frequency with a master clock frequency of the master device. The clock recovery loop comprises a primary loop having a first frequency error estimator for generating a first estimate of error between the master and slave clock frequencies, a second frequency error estimator outside of the primary loop for generating a second estimate of error between the master and slave clock frequencies, and an accumulator coupled between the second frequency error estimator and the primary loop. The second estimate is controllably injected into the primary loop via the accumulator.
摘要翻译： 通信系统的端点或其他通信设备包括时钟恢复模块。 通信设备相对于作为主设备操作的另一通信设备而作为从设备操作。 时钟恢复模块包括时钟恢复环路，其被配置为控制从设备的从时钟频率，以使从时钟频率与主设备的主时钟频率同步。 所述时钟恢复环路包括具有第一频率误差估计器的主回路，所述第一频率误差估计器用于产生主时钟频率与从时钟频率之间的误差的第一估计，在所述主回路外部的第二频率误差估计器，用于产生主机和 从时钟频率和耦合在第二频率误差估计器和主回路之间的累加器。 第二个估计可以通过蓄能器可控地注入主回路。
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公开(公告)号：US06718184B1
公开(公告)日：2004-04-06
申请号：US09671241
申请日：2000-09-28
IPC分类号： H04M100
CPC分类号： H04B7/0854 , H04B7/0615 , H04B7/10
摘要： A method for processing signals from multiple receiving/transmitting elements that define an array antenna is disclosed. The method includes measuring uplink signals from the elements of the array antenna to form a directional downlink antenna response. A first covariance matrix between pairs of uplink signals is determined for desired signal components of the measured uplink signals. A second covariance matrix is determined for noise and interference components of the measured uplink signals. An antenna processing system computes adaptive weights based on the first covariance matrix, the second covariance matrix and a loading term to in effect form a directional downlink radiation pattern. The loading term represents a balance adjustment between a first performance rating of a particular coverage area versus second performance rating of the wireless communication system. The first performance rating can represent the extent of providing a desired downlink power of a downlink signal to a subscriber station within a particular coverage area such as a sector or cell. The second performance rating can represent the extent of suppressing interference to other subscriber stations in the wireless communication system.
摘要翻译： 公开了一种用于处理来自定义阵列天线的多个接收/发射元件的信号的方法。 该方法包括测量来自阵列天线的元件的上行链路信号以形成定向下行链路天线响应。 确定上行链路信号对之间的第一协方差矩阵用于所测量的上行链路信号的所需信号分量。 确定测量的上行链路信号的噪声和干扰分量的第二协方差矩阵。 天线处理系统基于第一协方差矩阵，第二协方差矩阵和加载项计算自适应权重，以有效地形成定向下行辐射图。 加载项表示在特定覆盖区域的第一性能评级与无线通信系统的第二性能评级之间的平衡调整。 第一性能等级可以表示向诸如扇区或小区的特定覆盖区域内的用户站提供下行链路信号的期望下行链路功率的程度。 第二性能等级可以表示在无线通信系统中抑制对其他用户站的干扰的程度。
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8.发明申请Method, Apparatus and System for Frequency Synchronization Between Devices Communicating over a Packet Network 有权用于通过分组网络通信的设备之间的频率同步的方法，装置和系统公开(公告)号：US20100158051A1
公开(公告)日：2010-06-24
申请号：US12339318
申请日：2008-12-19
CPC分类号： H03L7/085 , H03L7/087 , H04J3/0664 , H04J3/0667
摘要： An endpoint or other communication device of a communication system includes a clock recovery module. The communication device is operative as a slave device relative to another communication device that is operative as a master device. The clock recovery module comprises a clock recovery loop configured to control a slave clock frequency of the slave device so as to synchronize the slave clock frequency with a master clock frequency of the master device. The clock recovery loop utilizes a frequency error estimator implemented as a maximum-likelihood estimator with slope fitting based on a sequence of arrival timestamps, and a loop filter implemented as a series combination of an adaptive-bandwidth filter and a proportional-integral controller. The clock recovery module may further comprise a discontinuity detector configured to detect a discontinuity in delays of respective timing messages, and a loop controller operative to place the clock recovery loop in a particular state responsive to detection of the discontinuity.
摘要翻译： 通信系统的端点或其他通信设备包括时钟恢复模块。 通信设备相对于作为主设备操作的另一通信设备而作为从设备操作。 时钟恢复模块包括时钟恢复环路，其被配置为控制从设备的从时钟频率，以使从时钟频率与主设备的主时钟频率同步。 时钟恢复环路利用被实现为基于到达时间序列的斜率拟合的最大似然估计器的频率误差估计器，以及实现为自适应带宽滤波器和比例积分控制器的串联组合的环路滤波器。 时钟恢复模块还可以包括不连续检测器，其被配置为检测相应定时消息的延迟的不连续性，以及循环控制器，用于响应于不连续性的检测将时钟恢复环置于特定状态。
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公开(公告)号：US20080118075A1
公开(公告)日：2008-05-22
申请号：US11937669
申请日：2007-11-09
IPC分类号： H04B3/20
CPC分类号： H04M9/082
摘要： The invention is a method and apparatus for frequency-domain adaptive filtering that has broad applications such as to equalizers, but is particularly suitable for use in acoustic echo cancellation circuits for stereophonic and other multiple channel teleconferencing systems. The method and apparatus utilizes a frequency-domain recursive least squares criterion that minimizes the error signal in the frequency-domain. In order to reduce the complexity of the algorithm, a constraint is removed resulting in an unconstrained frequency-domain recursive least mean squares method and apparatus. A method and apparatus for selecting an optimal adaptation step for the UFLMS is disclosed. The method and apparatus is generalized to the multiple channel case and exploits the cross-power spectra among all of the channels.
摘要翻译： 本发明是用于频域自适应滤波的方法和装置，其具有广泛的应用，例如均衡器，但是特别适用于立体声和其他多声道电话会议系统的声学回波消除电路。 该方法和装置利用使频域中的误差信号最小化的频域递归最小二乘准则。 为了降低算法的复杂度，去除约束，导致无约束的频域递归最小均方法和装置。 公开了一种用于选择UFLMS的最佳适应步骤的方法和装置。 该方法和装置被广泛应用于多信道情况，并利用所有信道中的交叉功率谱。
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公开(公告)号：US07310425B1
公开(公告)日：2007-12-18
申请号：US09473547
申请日：1999-12-28
CPC分类号： H04M9/082
摘要： The invention is a method and apparatus for frequency-domain adaptive filtering that has broad applications such as to equalizers, but is particularly suitable for use in acoustic echo cancellation circuits for stereophonic and other multiple channel teleconferencing systems. The method and apparatus utilizes a frequency-domain recursive least squares criterion that minimizes the error signal in the frequency-domain. In order to reduce the complexity of the algorithm, a constraint is removed resulting in an unconstrained frequency-domain recursive least mean squares method and apparatus. A method and apparatus for selecting an optimal adaptation step for the UFLMS is disclosed. The method and apparatus is generalized to the multiple channel case and exploits the cross-power spectra among all of the channels.
摘要翻译： 本发明是用于频域自适应滤波的方法和装置，其具有广泛的应用，例如均衡器，但是特别适用于立体声和其他多声道电话会议系统的声学回波消除电路。 该方法和装置利用使频域中的误差信号最小化的频域递归最小二乘准则。 为了降低算法的复杂度，去除约束，导致无约束的频域递归最小均方法和装置。 公开了一种用于选择UFLMS的最佳适应步骤的方法和装置。 该方法和装置被广泛应用于多信道情况，并利用所有信道中的交叉功率谱。
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