公开(公告)号：US20070237214A1

公开(公告)日：2007-10-11

申请号：US11712125

申请日：2007-02-28

Applicant: Patrick Duvaut ,  Amitkumar Mahadevan ,  Massimo Sorbara

Inventor： Patrick Duvaut ,  Amitkumar Mahadevan ,  Massimo Sorbara

IPC: H04B1/38

CPC classification number: H04M11/062

Abstract: There is provided a method of shaping PSD (Power Spectrum Density) of an FTTN (Fiber-To-The-Node) downstream signal from a disturber source to achieve spectral compatibility at an FTTN downstream victim with a downstream PSD from a reference source. The method includes receiving the downstream PSD from the reference source. The method further includes receiving an unshaped downstream PSD from the disturber source. The method further includes shaping the PSD of the FTTN downstream signal to have a substantially equivalent FEXT (Far-End Cross-Talk) into the FTTN downstream victim as the downstream PSD from the reference source.

Abstract translation: 提供了一种从干扰源获得FTTN（光纤到节点）下行信号的PSD（功率谱密度）的方法，以在具有来自参考源的下游PSD的FTTN下游受害者处获得频谱兼容性。 该方法包括从参考源接收下游PSD。 该方法还包括从干扰源接收未形成的下游PSD。 该方法还包括对FTTN下行信号的PSD进行整形，以使作为来自参考源的下游PSD的FTTN下游受害者具有基本相等的FEXT（远端交叉对话）。

公开(公告)号：US20070153838A1

公开(公告)日：2007-07-05

申请号：US11617028

申请日：2006-12-28

Applicant: Julien Pons ,  Amitkumar Mahadevan ,  Patrick Duvaut

Inventor： Julien Pons ,  Amitkumar Mahadevan ,  Patrick Duvaut

IPC: H04J3/00

CPC classification number: H03M13/2732 ,  H03M13/1102 ,  H03M13/2957 ,  H03M13/31 ,  H03M13/6362 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L27/2601

Abstract: Included are embodiments for subframe interleaving. At least one embodiment of a method includes receiving at least one subframe, the at least one subframe being derived from a plurality of frames of data and interspersing at least a portion of the at least one subframe according to a predetermined subframe interleaving strategy.

Abstract translation: 包括子帧交织的实施例。 方法的至少一个实施例包括接收至少一个子帧，所述至少一个子帧是从多个数据帧导出的，并且根据预定的子帧交错策略散布至少一个子帧的至少一部分。

公开(公告)号：US08767521B2

公开(公告)日：2014-07-01

申请号：US12807524

申请日：2010-09-08

Applicant: Shailendra K. Singh ,  Amitkumar Mahadevan ,  Laurent F. Alloin

Inventor： Shailendra K. Singh ,  Amitkumar Mahadevan ,  Laurent F. Alloin

IPC: H04J1/12

CPC classification number: H04M11/062 ,  H04B3/32 ,  H04B3/487 ,  H04M3/304 ,  H04M3/306 ,  H04M3/34 ,  H04M2203/056

Abstract: A system for performing a single ended line test (SELT) of a selected subscriber line within a bundle of in-service subscriber lines each supporting frequency division multiplexed multi-tone modulated XDSL communications. The system comprises: a crosstalk cancellation module and a SELT module. The crosstalk cancellation module is coupled to the subscriber lines and configured to cancel crosstalk between the selected subscriber line under test and the in-service subscriber lines. The SELT module couples to the crosstalk cancellation module and is configured to coordinate SELT testing with the crosstalk cancellation module to cancel crosstalk between the selected subscriber line and the in-service subscriber lines during testing.

Abstract translation: 一种用于在支持频分复用多音调调制的XDSL通信的一连串在用用户线路中执行所选用户线路的单端测试（SELT）的系统。 该系统包括：串扰消除模块和SELT模块。 串扰消除模块耦合到用户线路并且被配置为消除所选择的被测试用户线路与在线用户线路之间的串扰。 SELT模块耦合到串扰消除模块，并配置为与串扰消除模块协调SELT测试，以在测试期间消除所选用户线路和在用用户线路之间的串扰。

公开(公告)号：US08515016B2

公开(公告)日：2013-08-20

申请号：US12044489

申请日：2008-03-07

Applicant: Patrick Duvaut ,  Amitkumar Mahadevan ,  Vaibhav Dinesh

Inventor： Patrick Duvaut ,  Amitkumar Mahadevan ,  Vaibhav Dinesh

IPC: H04M1/24

CPC classification number: H04M3/302 ,  H04M3/085

Abstract: Systems and methods for performing bridge tap detection are described. One embodiment is a method which comprises receiving an echo signal for a loop under test where the echo signal is a per-port calibrated echo response obtained using frequency domain reflectometry single-ended line testing (FDR-SELT). The method further comprises analyzing the echo signal to determine whether differentiating features are present in the per-port calibrated echo signal in order to determine whether the loop under test is a bridge tapped loop.

Abstract translation: 描述了用于执行桥接抽头检测的系统和方法。 一个实施例是一种方法，其包括接收用于测试环路的回波信号，其中回波信号是使用频域反射测量单端线测试（FDR-SELT）获得的每端口校准的回波响应。 该方法还包括分析回波信号以确定在每端口校准的回波信号中是否存在微分特征，以便确定被测环路是否是桥接抽头循环。

公开(公告)号：US08457219B2

公开(公告)日：2013-06-04

申请号：US11615535

申请日：2006-12-22

Applicant: Julien Pons ,  Amitkumar Mahadevan ,  Patrick Duvaut

Inventor： Julien Pons ,  Amitkumar Mahadevan ,  Patrick Duvaut

IPC: H04K1/10

CPC classification number: H03M13/2732 ,  H03M13/1102 ,  H03M13/2957 ,  H03M13/31 ,  H03M13/6362 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L27/2601

Abstract: Included are embodiments for self protection. At least one embodiment includes Self-protection Unit for protecting a signal that includes a first receiving component configured to receive data, the received data being received as at least one frame and a subframing component configured to subframe at least a portion of the received data, wherein subframing includes converting the at least one into a plurality of subframes. Some embodiments include a subframe interleaver component configured to interleave at least a portion of the subframes.

Abstract translation: 包括自我保护的实施例。 至少一个实施例包括用于保护包括被配置为接收数据的第一接收组件的信号的自保护单元，被接收为至少一个帧的接收数据和被配置为子帧接收到的数据的至少一部分的子帧组件， 其中子帧包括将所述至少一个转换成多个子帧。 一些实施例包括被配置为交织子帧的至少一部分的子帧交织器组件。

公开(公告)号：US08194767B2

公开(公告)日：2012-06-05

申请号：US13091651

申请日：2011-04-21

Applicant: Patrick Duvaut ,  Amitkumar Mahadevan ,  Massimo Sorbara ,  Ehud Langberg

Inventor： Patrick Duvaut ,  Amitkumar Mahadevan ,  Massimo Sorbara ,  Ehud Langberg

IPC: H04L27/28

CPC classification number: H04B3/32 ,  H04L1/0042

Abstract: One embodiment is a method for precoding data for transmission in a discrete multi-tone (DMT) system to cancel self-induced far end crosstalk (self-FEXT). The method comprises learning, by the system, characteristics associated with a plurality of N users within a digital subscriber line (xDSL) system to determine an initial off-diagonal multiple input multiple output (MIMO) precoder (ODMP) for a given tone frequency and converging towards an ODMP from the initial ODMP to cancel self-FEXT for the plurality of N users, wherein the ODMP is represented as a zero diagonal matrix containing only off-diagonal terms.

Abstract translation: 一个实施例是用于在离散多音（DMT）系统中预编码用于传输的数据以消除自感应远端串扰（self-FEXT）的方法。 该方法包括通过系统学习与数字用户线（xDSL）系统内的多个N个用户相关联的特征，以确定给定音频的初始非对角多输入多输出（MIMO）预编码器（ODMP），以及 从初始ODMP收敛到ODMP以取消多个N个用户的自身FEXT，其中ODMP被表示为仅包含非对角项的零对角矩阵。

公开(公告)号：US08144757B2

公开(公告)日：2012-03-27

申请号：US12178355

申请日：2008-07-23

Applicant: Joel M. Morris ,  Ronald Hozloehner ,  Amitkumar Mahadevan ,  Curtis R. Menyuk ,  John W. Zweck

Inventor： Joel M. Morris ,  Ronald Hozloehner ,  Amitkumar Mahadevan ,  Curtis R. Menyuk ,  John W. Zweck

IPC: H04B3/46

CPC classification number: H04L1/203

Abstract: A dual adaptive importance-sampling system and method is provided that can estimate the probability of events by combining dual complementary importance-sampling simulations. The present invention exploits the ability to determine an optimal biased pdf using an iterative procedure that requires relatively little a priori knowledge of how to bias. Hence, the present invention is particularly suited for evaluating the BERs and/or WERs of coded communication and storage systems, and is generally applicable to arbitrarily chosen codes. When applied to coded communication and storage systems, the present invention provides a versatile technique for the fast and accurate estimation of BERs and WERs of FEC codes down to values of 10−20 or lower.

Abstract translation: 提供了一种双重自适应重要性抽样系统和方法，可以通过组合双重互补重要性抽样模拟来估计事件的概率。 本发明利用了使用迭代过程确定最佳偏差pdf的能力，该迭代过程需要相对较少的如何偏向的先验知识。 因此，本发明特别适用于评估编码的通信和存储系统的BER和/或WER，并且通常适用于任意选择的代码。 当应用于编码通信和存储系统时，本发明提供了一种通用技术，用于将FEC码的BER和WER的快速和准确估计降低到10-20或更低的值。

公开(公告)号：US20110235759A1

公开(公告)日：2011-09-29

申请号：US13051906

申请日：2011-03-18

Applicant: Laurent Pierrugues ,  Laurent Francis Alloin ,  Amitkumar Mahadevan

Inventor： Laurent Pierrugues ,  Laurent Francis Alloin ,  Amitkumar Mahadevan

IPC: H04L25/08

CPC classification number: H04B1/1027 ,  H04B3/32 ,  H04L25/03012 ,  H04L25/03159

Abstract: In accordance with one embodiment, a method is implemented in a vectored system for improving a signal-to-noise ratio (SNR) of a far end transmitted signal on a victim line in the system. The method comprises mitigating, by the vectored system, self-induced far-end crosstalk (self-FEXT) on the victim line based on self-FEXT mitigation coefficients and receiving, by a second sensor, information relating to at least one of: self-FEXT of the vectored system, external noise, and the far end transmitted signal. The method further comprises learning, at the second sensor, coefficients relating to self-FEXT coupling into the second sensor and removing self-FEXT from the second sensor based on the learned coefficients. Upon removal of self-FEXT from the second sensor, a linear combiner configured to combine information relating to the victim line and the second line is learned. The method further comprises applying the learned linear combiner and readjusting the self-FEXT mitigation coefficients to remove any residual self-FEXT on the victim line after application of the learned linear combiner.

Abstract translation: 根据一个实施例，在矢量系统中实现一种方法，用于改善系统中受害线路上的远端发射信号的信噪比（SNR）。 该方法包括通过矢量系统减轻基于自FEXT减轻系数的受害线上的自身诱发的远端串扰（self-FEXT），并且由第二传感器接收与以下至少一个相关的信息：自身 -OFXT的矢量系统，外部噪声和远端传输信号。 该方法还包括在第二传感器处学习与第二传感器的自FEXT耦合有关的系数，并且基于所学习的系数从第二传感器中去除自FEXT。 在从第二传感器移除自身FEXT时，学习用于组合与受害线和第二线有关的信息的线性组合器。 该方法还包括应用所学习的线性组合器，并且在应用所学习的线性组合器之后重新调整自FEXT缓解系数以去除所述受害线上的任何剩余自FEXT。

公开(公告)号：US07978756B2

公开(公告)日：2011-07-12

申请号：US12098696

申请日：2008-04-07

Applicant: Hemant Samdani ,  Kunal Raheja ,  Rahul Garg ,  Patrick Duvaut ,  Amitkumar Mahadevan ,  Robert A. Day ,  Robin Levonas

Inventor： Hemant Samdani ,  Kunal Raheja ,  Rahul Garg ,  Patrick Duvaut ,  Amitkumar Mahadevan ,  Robert A. Day ,  Robin Levonas

IPC: H04B3/46 ,  H04B17/00 ,  H04Q1/20

CPC classification number: H04L27/2647 ,  H04B3/487

Abstract: Systems and methods for monitoring impulse noise are described. At least one embodiment is a method, which comprises detecting whether impulse noise is present and in response to detecting the presence of impulse noise, performing time domain analysis to determine whether one or more impulse noise sources are present based on minimum interarrival time and maximum impulse length. The method further includes performing frequency domain analysis to estimate frequencies associated with the one or more impulse noise sources and based on the time domain analysis and frequency domain analysis, providing a total number of impulse noise sources and frequencies associated with the impulse noise sources. In this regard, the embodiments described herein provide dual-speed monitoring of impulse noise in the form of short-term and long-term monitoring. The use of dual-speed monitoring ensures that dynamic changes in the impulse noise environment are quickly addressed and also ensures better characterization of multiple impulse noise sources in order to provide better impulse noise protection.

Abstract translation: 描述了用于监视脉冲噪声的系统和方法。 至少一个实施例是一种方法，其包括检测是否存在脉冲噪声并且响应于检测到脉冲噪声的存在，执行时域分析以基于最小间隔时间和最大脉冲来确定是否存在一个或多个脉冲噪声源 长度。 该方法还包括执行频域分析以估计与一个或多个脉冲噪声源相关联的频率，并且基于时域分析和频域分析，提供脉冲噪声源和与脉冲噪声源相关联的频率的总数。 在这方面，本文描述的实施例以短期和长期监视的形式提供脉冲噪声的双速度监测。 使用双速度监测可确保脉冲噪声环境中的动态变化得到快速解决，并确保更好地表征多个脉冲噪声源，以提供更好的脉冲噪声保护。

公开(公告)号：US20100220823A1

公开(公告)日：2010-09-02

申请号：US12713482

申请日：2010-02-26

Applicant: Pravesh Biyani ,  Laurent Francis Alloin ,  Shankar Prakriya ,  Surendra Prasad ,  Amitkumar Mahadevan

Inventor： Pravesh Biyani ,  Laurent Francis Alloin ,  Shankar Prakriya ,  Surendra Prasad ,  Amitkumar Mahadevan

IPC: H04B1/10

CPC classification number: H04B3/32 ,  H04J1/12 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: Systems and methods for partial self-FEXT (far-end crosstalk) are described. One method, among others, comprises determining one or more instantaneous characteristics of an input signal, wherein the one or more instantaneous characteristics comprise one or more of amplitude of the input signal and an energy level of the input signal. The method further comprises selecting one or more disturbers to cancel according to the one or more instantaneous characteristics, wherein selecting one or more disturbers is performed on a per-DMT (discrete multi-tone) symbol basis.

Abstract translation: 描述了部分自FEXT（远端串扰）的系统和方法。 一种方法包括确定输入信号的一个或多个瞬时特性，其中一个或多个瞬时特性包括输入信号的幅度和输入信号的能级中的一个或多个。 该方法还包括根据一个或多个瞬时特性选择一个或多个干扰器来取消，其中，对每个DMT（离散多音调）符号进行选择一个或多个干扰器。