公开(公告)号：US07003030B2

公开(公告)日：2006-02-21

申请号：US10635194

申请日：2003-08-06

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Robert F. H. Fischer ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Robert F. H. Fischer ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： H03K5/159

CPC分类号： H04L7/0062 ,  H04L7/0029 ,  H04L2025/03363 ,  H04L2025/0342 ,  H04L2025/0349

摘要： Receivers, methods, and computer program products can be used to demodulate a data signal transmitted from a digital source, which has a network sampling rate that is synchronized with a network clock. In an illustrative embodiment, a receiver includes a two-stage interpolator that receives digital samples of the data signal as an input and produces an interpolated digital sample stream to be filtered by an adaptive fractionally spaced decision feedback equalizer. The digital samples received in the interpolator are synchronized with a local clock; however, the interpolated sample stream is synchronized with the network clock. A slicer generates symbols for the samples output from the decision feedback equalizer by comparing the samples with a reference signaling alphabet. The receiver can be used in a V.90 client modem to demodulate pulse code modulated (PCM) data transmitted as pulse amplitude modulated (PAM) signals from a digital network. In addition, the receiver is compatible with legacy analog modem front ends and transmitters. The two-stage interpolator allows the timing synchronization to be performed with extremely fine granularity, which can be useful in PCM modems that typically require relatively high signal to noise ratios.

摘要翻译： 接收器，方法和计算机程序产品可用于解调从具有与网络时钟同步的网络采样速率的数字源发送的数据信号。 在说明性实施例中，接收机包括二阶插值器，其接收作为输入的数据信号的数字样本，并产生经过自适应分数间隔的判决反馈均衡器滤波的内插数字样本流。 在内插器中接收的数字样本与本地时钟同步; 然而，插值的采样流与网络时钟同步。 切片器通过将样本与参考信号字母表进行比较来生成从判决反馈均衡器输出的样本的符号。 接收机可用于V.90客户端调制解调器中，以解调从数字网络传输的脉冲编码调制（PCM）数据作为脉冲幅度调制（PAM）信号。 此外，接收机与传统模拟调制解调器前端和发射机兼容。 两级内插器允许以非常精细的粒度执行定时同步，这在通常需要相对较高的信噪比的PCM调制解调器中是有用的。

公开(公告)号：US06661837B1

公开(公告)日：2003-12-09

申请号：US09264475

申请日：1999-03-08

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： H04B1700

CPC分类号： H04L1/0021 ,  H04L1/0002 ,  H04L25/03057 ,  H04L25/4927 ,  H04L2025/03388 ,  Y02D50/10

摘要： Modems, methods, and computer program products select a data rate based on error signals in a modem. In an illustrative embodiment, error signals representing the difference between an output of an equalizer and an output of a detector are accumulated and an average error value is computed therefrom. A signal to noise ratio is determined using the average error value. The signal to noise ratio is then used to select a data rate. In another illustrative embodiment, the mean squared error at the output of the equalizer is determined and then used, along with the probability of error in correctly detecting a symbol, to select a data rate. Incorrect decisions in detecting received data symbols can cause a catastrophic failure in a decision feedback equalizer used in a modem receiver as errors are repeatedly fed back causing the tap coefficients for the equalizer filters to be shifted from their normal operating values. By adjusting the data rate in accordance with the error signals generated in a modem receiver, the decision feedback equalizer can operate with greater stability as the data rate can be reduced in response to increased noise conditions.

公开(公告)号：US06665336B2

公开(公告)日：2003-12-16

申请号：US10428357

申请日：2003-05-02

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： H04B1700

CPC分类号： H04L1/0021 ,  H04L1/0002 ,  H04L25/03057 ,  H04L25/4927 ,  H04L2025/03388 ,  Y02D50/10

摘要： Modems, methods, and computer program products select a data rate based on error signals in a modem. In an illustrative embodiment, error signals representing the difference between an output of an equalizer and an output of a detector are accumulated and an average error value is computed therefrom. A signal to noise ratio is determined using the average error value. The signal to noise ratio is then used to select a data rate. In another illustrative embodiment, the mean squared error at the output of the equalizer is determined and then used, along with the probability of error in correctly detecting a symbol, to select a data rate. Incorrect decisions in detecting received data symbols can cause a catastrophic failure in a decision feedback equalizer used in a modem receiver as errors are repeatedly fed back causing the tap coefficients for the equalizer filters to be shifted from their normal operating values. By adjusting the data rate in accordance with the error signals generated in a modem receiver, the decision feedback equalizer can operate with greater stability as the data rate can be reduced in response to increased noise conditions.

摘要翻译： 调制解调器，方法和计算机程序产品根据调制解调器中的错误信号选择数据速率。 在说明性实施例中，代表均衡器的输出和检测器的输出之间的差的误差信号被累加，并且从其计算出平均误差值。 使用平均误差值确定信噪比。 然后使用信噪比来选择数据速率。 在另一说明性实施例中，确定均衡器的输出处的均方误差，然后与正确检测符号的误差概率一起使用以选择数据速率。 检测接收到的数据符号时的不正确决定可能导致在调制解调器接收机中使用的判决反馈均衡器中的灾难性故障，因为错误被反复反馈，导致均衡器滤波器的抽头系数从其正常操作值偏移。 通过根据在调制解调器接收机中产生的误差信号来调整数据速率，当响应于增加的噪声条件可以减小数据速率时，判决反馈均衡器可以更稳定地工作。

公开(公告)号：US06341360B1

公开(公告)日：2002-01-22

申请号：US09264094

申请日：1999-03-08

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： G06F1100

CPC分类号： H04L25/4927 ,  H04L25/03057 ,  H04L2025/03363 ,  H04L2025/03694

摘要： Decision feedback equalizers having a stabilization capability, and methods and computer program products for stabilizing a decision feedback equalizer under severe error conditions use output samples from an equalizer to determine whether a severe error event has occurred in accordance with predefined criteria. If a severe error occurs, then a determination is made to evaluate whether the number of severe errors that have occurred has exceeded a threshold. If the threshold has been exceeded, then the coefficients for the filter(s) in the decision feedback equalizer are preserved in their current state. Severe errors can cause the equalizer filter coefficients to be pulled away from their normal operating values, which can result in several modulation cycles passing before the coefficients are restored. By preserving the equalizer filter coefficients under severe error conditions, the present invention prevents sharp or dramatic changes to the coefficient values from their steady state values allowing the decision feedback equalizer to recover more quickly from the errors.

摘要翻译： 具有稳定能力的判决反馈均衡器，以及用于在严重误差条件下稳定判决反馈均衡器的方法和计算机程序产品，使用来自均衡器的输出样本来确定是否根据预定标准发生严重错误事件。 如果发生严重的错误，则进行判断，以评估发生的严重错误的数量是否超过阈值。 如果超过阈值，则判决反馈均衡器中滤波器的系数保持在其当前状态。 严重的错误可能导致均衡器滤波器系数从其正常工作值被拉开，这可能导致在系数恢复之前通过的多个调制周期。 通过在严重的误差条件下保持均衡器滤波器系数，本发明防止系数值从其稳定状态值的急剧或显着变化，从而允许判决反馈均衡器从错误中更快地恢复。

公开(公告)号：US06381267B1

公开(公告)日：2002-04-30

申请号：US09264421

申请日：1999-03-08

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Evangelos Stavros Eleftheriou ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： H04B138

CPC分类号： H04L1/0003 ,  Y02D50/10

摘要： Modems, methods, and computer program products for falling back to a low speed mode of operation upon detection of abnormal line conditions during startup perform a first phase of a multiphase startup procedure in accordance with a high speed mode of operation. A determination is then made whether the line conditions will support high speed communication. If a high speed connection cannot be established, then subsequent phases of the startup procedure will be performed in accordance with the low speed mode of operation. Otherwise, subsequent phases of the startup procedure will be performed in accordance with the high speed mode of operation. By detecting abnormal line conditions, such as digital discontinuity, severe attenuation, or a local loop having a non-linear frequency response, early in the startup protocol, the remainder of the startup protocol can be performed in accordance with a low speed more of operation as the detected abnormalities in the communication path will prevent the establishment of a higher data rate connection. Accordingly, the reliability and efficiency of the startup protocol are improved.

摘要翻译： 在启动期间检测到异常线路状况时，回调到低速运行模式的调制解调器，方法和计算机程序产品根据高速运行模式执行多相启动过程的第一阶段。 然后确定线路条件是否将支持高速通信。 如果不能建立高速连接，则根据低速运行模式执行启动过程的后续阶段。 否则，将根据高速运行模式执行启动过程的后续阶段。 通过在启动协议的早期检测到诸如数字不连续性，严重衰减或具有非线性频率响应的本地环路之类的异常线路状况，可以根据较低的运行速度执行启动协议的其余部分 由于检测到的通信路径异常将阻止建立较高的数据速率连接。 因此，提高了启动协议的可靠性和效率。

公开(公告)号：US06823004B1

公开(公告)日：2004-11-23

申请号：US09430097

申请日：1999-10-29

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Michelle Chan Granholm ,  Dongming Hwang ,  Fredy D. Neeser ,  Robert John Schule ,  Malcolm Scott Ware ,  Hua Ye ,  Charles Robert Young

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Ajay Dholakia ,  Michelle Chan Granholm ,  Dongming Hwang ,  Fredy D. Neeser ,  Robert John Schule ,  Malcolm Scott Ware ,  Hua Ye ,  Charles Robert Young

IPC分类号： H04B138

CPC分类号： G06F11/3485 ,  H04M11/066 ,  H04W24/00 ,  H04W48/16 ,  H04W76/10

摘要： Methods, systems and computer program products are provided for monitoring performance of a modem which obtain diagnostic data directly from memory associated with the modem's digital signal processor (DSP). A secondary path to the DSP memory is utilized for the monitoring operations so that real time data can be obtained during connection startup procedures and during an active connection. First-in first-out (FIFO) buffers are incorporated in the DSP memory to track state transitions of one or more of the state machines within the modem and various performance data measurements may be obtained directly from the DSP memory responsive to different state transition events. The real time collected data may be stored in a file and provided to a remote location for use in diagnosing customer problems with specific customer line connections. Accordingly, real time monitoring of digital and analog line conditions and modem performance may be utilized to diagnose problems with modems and line connections.

摘要翻译： 提供了方法，系统和计算机程序产品，用于监视直接从与调制解调器的数字信号处理器（DSP）相关联的存储器获取诊断数据的调制解调器的性能。 利用DSP存储器的辅助路径进行监视操作，以便在连接启动过程期间和在主动连接期间可以获得实时数据。 先进先出（FIFO）缓冲器被并入DSP存储器中以跟踪调制解调器内的一个或多个状态机的状态转换，并且可以响应于不同的状态转换事件从DSP存储器直接获得各种性能数据测量 。 实时收集的数据可以存储在文件中并提供给远程位置以用于诊断具有特定客户线路连接的客户问题。 因此，可以利用数字和模拟线路条件和调制解调器性能的实时监测来诊断调制解调器和线路连接的问题。

公开(公告)号：US06757325B1

公开(公告)日：2004-06-29

申请号：US09430698

申请日：1999-10-29

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Ajay Dholakia ,  Dongming Hwang ,  Fredy D. Neeser ,  Robert John Schule ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Ajay Dholakia ,  Dongming Hwang ,  Fredy D. Neeser ,  Robert John Schule ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： H04L516

CPC分类号： H04L25/4927

摘要： Methods, modems and computer program products for detecting whether a remote modem is of a particular design type and for adjusting the communication configuration for a communication session based on a type of the remote modem. The modem type is recognized based on a knowledge that the modem design of certain manufacturers has a unique associated data pattern contained within the startup communication sequence which is not specified by the protocol but which can be demodulated and detected to thereby recognize that the remote modem is a particular manufacturer's design type. Based on knowledge of the characteristics of the remote modem design, various steps are taken which may improve performance of the communication connection in light of the particular modem design's characteristics. For example, a different Total Harmonic Distortion (THD) threshold may be used for falling back to V.34 communications when the remote modem design only supports up to 2 look ahead for spectrum shaping.

摘要翻译： 用于检测远程调制解调器是否是特定设计类型的方法，调制解调器和计算机程序产品，以及用于基于远程调制解调器的类型来调整通信会话的通信配置。 基于知道某些制造商的调制解调器设计具有包含在启动通信序列内的唯一关联数据模式的知识，可以识别调制解调器类型，该数据模式不是由协议规定的，而是可以被解调和检测，从而识别远程调制解调器 特定制造商的设计类型。 基于对远程调制解调器设计的特征的了解，采取了各种步骤，可以根据特定的调制解调器设计的特性改善通信连接的性能。 例如，当远程调制解调器设计仅支持最多2个前进用于频谱整形时，可以使用不同的总谐波失真（THD）阈值来回退到V.34通信。

公开(公告)号：US06650657B1

公开(公告)日：2003-11-18

申请号：US09429859

申请日：1999-10-29

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Ajay Dholakia ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Ajay Dholakia ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： H04J324

CPC分类号： H04J3/125

摘要： Robbed Bit Signaling (RBS) and PAD digital impairments in sets of Digital Impairment Learning (DIL) signals that are repeatedly transmitted from a server modem to a client modem during DIL intervals are identified by identifying a PAD level for the sets of DIL signals in the DIL intervals and then identifying an RBS type for individual sets of DIL signals based upon the PAD levels so identified. The PAD level may be identified using model DIL signals that correspond to PAD levels that are not subject to RBS. The RBS type may be identified using model DIL signals that correspond to multiple RBS types that are subject to the identified PAD level. More specifically, one of the DIL intervals that contains DIL signals that are not subject to RBS is identified. A PAD level for the DIL signals in the one of the DIL intervals so identified then is determined. The PAD level that was determined is applied to the DIL signals in remaining ones of the DIL intervals, to identify an RBS for the DIL signals in the remaining ones of the DIL intervals.

摘要翻译： 通过在DIL间隔期间从服务器调制解调器重复发送到客户端调制解调器的数字损伤学习（DIL）信号中的Robbed位信令（RBS）和PAD数字损伤被识别为DIL信号组中的PAD电平 DIL间隔，然后基于所识别的PAD水平识别用于各组DIL信号的RBS类型。 可以使用对应于不受RBS的PAD电平的模型DIL信号来识别PAD电平。 可以使用对应于经受所识别的PAD电平的多个RBS类型的模型DIL信号来识别RBS类型。 更具体地，识别包含不受RBS的DIL信号的DIL间隔之一。 确定如此识别的DIL间隔之一中的DIL信号的PAD电平。 将确定的PAD电平应用于DIL间隔中剩余的DIL信号，以识别DIL间隔中剩余的DIL信号中的DBS信号的RBS。

公开(公告)号：US06662322B1

公开(公告)日：2003-12-09

申请号：US09430700

申请日：1999-10-29

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Ajay Dholakia ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Ajay Dholakia ,  Dongming Hwang ,  Fredy D. Neeser ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： G06F1100

CPC分类号： H04L27/3405 ,  H04L25/4917

摘要： Error rate control systems, methods, and computer program products request a data rate slow-down based on the status of the error rate. A linear penalty is generated if a data rate slow-down is requested, which is then used to determine a minimum distance between constellation points in a signaling constellation or alphabet. Because the minimum distance between constellation points may be directly related to the error probability, the error rate may be controlled through the linear penalty.

摘要翻译： 错误率控制系统，方法和计算机程序产品根据错误率的状态请求数据速率变慢。 如果请求数据速率减慢，则产生线性惩罚，然后将其用于确定信号星座或字母表中的星座点之间的最小距离。 因为星座点之间的最小距离可能与误差概率直接相关，所以误差率可以通过线性惩罚来控制。

公开(公告)号：US06889346B2

公开(公告)日：2005-05-03

申请号：US09906371

申请日：2001-07-16

申请人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Dongming Hwang ,  Clark Debs Jeffries ,  Malcolm Scott Ware ,  Hua Ye

发明人： Youssef Abdelilah ,  Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Dongming Hwang ,  Clark Debs Jeffries ,  Malcolm Scott Ware ,  Hua Ye

IPC分类号： G06F11/00 ,  G06F13/00

CPC分类号： H04L47/76 ,  H04L41/0896 ,  H04L43/50 ,  H04L63/083

摘要： A remote controller is coupled to a target system via a computer network A real time probe is installed in software executing on a target system, typically a Digital Signal Processor (DSP). The remote controller includes a “debugger user interface” which accepts and interprets scoping commands issued by a developer. A controller network driver constructs appropriate network packets to be sent over the network to the target system. The target system has a control processor which runs a target network driver for receiving the network packets containing the scoping commands. The scoping commands are sent to an “embedded debugger” which performs the requested probing/scoping. When the DSP code runs across an address where the probe is installed, the embedded debugger will collect the signal values. The collected scope data will be interleaved and sent to the target network driver which, will encapsulate the information into suitable packets to send back to the controller via the network.

摘要翻译： 遥控器经由计算机网络耦合到目标系统。实时探测器安装在目标系统（通常为数字信号处理器（DSP））上执行的软件中。 遥控器包括一个“调试器用户界面”，它接受并解释开发人员发出的作用域命令。 控制器网络驱动程序构建要通过网络发送到目标系统的适当网络数据包。 目标系统具有控制处理器，该控制处理器运行目标网络驱动器以接收包含范围命令的网络分组。 范围指令被发送到执行所请求的探测/范围的“嵌入式调试器”。 当DSP代码在安装探头的地址上运行时，嵌入式调试器将收集信号值。 收集的范围数据将被交织并发送到目标网络驱动程序，目标网络驱动程序将将信息封装到适当的数据包中，以通过网络发送回控制器。