利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

17 条记录 (耗时 0.033 秒)

    System and method for controlling line driver power in digital subscriber line modems
    2.
    发明授权
    System and method for controlling line driver power in digital subscriber line modems 有权
    用于数字用户线路调制解调器控制线路驱动器功率的系统和方法

    公开(公告)号：US07480327B2

    公开(公告)日：2009-01-20

    申请号：US11945213

    申请日：2007-11-26

    申请人： Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Evangelos Stavros Eleftheriou ,  Sedat Oelcer ,  Malcolm Scott Ware

    发明人： Gordon Taylor Davis ,  Jeffrey Haskell Derby ,  Evangelos Stavros Eleftheriou ,  Sedat Oelcer ,  Malcolm Scott Ware

    IPC分类号： H04B1/38 ,  H04L5/16

    CPC分类号： H04L25/028 ,  H04L27/2626 ,  H04M11/062 ,  Y02D50/44

    摘要： A method for operating plurality of DSL modem transmitters integrated within a circuit card. The method includes each DSL modem transmitter: generating a full power physical frame when the DSL modem transmitter is provided with data to transmit; generating a low power physical frame having a control channel signal component and no data; and selecting between the full power physical frame and the low power physical frame for transmission from the DSL modem transmitter, wherein selection of the low power physical frame for transmission from the DSL modem transmitter is based only on the DSL modem transmitter having no data to transmit. The method further includes limiting aggregate flow of data to the plurality of DSL modem transmitters such that a total power required by the plurality of DSL modem transmitters is held below a predefined target power level.

    摘要翻译： 一种用于操作集成在电路卡内的多个DSL调制解调器发射机的方法。 该方法包括每个DSL调制解调器发射机：当DSL调制解调器发射机被提供有要传输的数据时，产生全功率物理帧; 生成具有控制信道信号分量且不存在数据的低功率物理帧; 并且在全功率物理帧和低功率物理帧之间选择用于从DSL调制解调器发射机发射，其中，用于从DSL调制解调器发射机传输的低功率物理帧的选择仅基于没有数据传输的DSL调制解调器发射机 。 该方法还包括限制数据到多个DSL调制解调器发射机的汇总流量，使得多个DSL调制解调器发射机所需的总功率保持在预定义的目标功率电平以下。

    MODEMS, METHODS, AND COMPUTER PROGRAM PRODUCTS FOR SELECTING AN OPTIMUM DATA RATE USING ERROR SIGNALS REPRESENTING THE DIFFERENCE BETWEEN THE OUTPUT OF AN EQUALIZER AND THE OUTPUT OF A SLICER OR DETECTOR
    6.
    发明授权
    MODEMS, METHODS, AND COMPUTER PROGRAM PRODUCTS FOR SELECTING AN OPTIMUM DATA RATE USING ERROR SIGNALS REPRESENTING THE DIFFERENCE BETWEEN THE OUTPUT OF AN EQUALIZER AND THE OUTPUT OF A SLICER OR DETECTOR 失效
    使用错误信号选择最佳数据速率的方式，方法和计算机程序产品，表示均衡器的输出与切换器或检测器的输出之间的差异

    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。

    Receivers, methods, and computer program products for an analog modem that receives data signals from a digital modem
    8.
    发明授权
    Receivers, methods, and computer program products for an analog modem that receives data signals from a digital modem 失效
    用于从数字调制解调器接收数据信号的模拟调制解调器的接收器，方法和计算机程序产品

    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。

    Modems, methods, and computer program products for falling back to a lower data rate protocol upon detecting abnormal line conditions during startup
    9.
    发明授权
    Modems, methods, and computer program products for falling back to a lower data rate protocol upon detecting abnormal line conditions during startup 失效
    调制解调器，方法和计算机程序产品在启动期间检测到异常线路状况时，可以降低到较低的数据速率协议

    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。