公开(公告)号：US08885736B2

公开(公告)日：2014-11-11

申请号：US12138657

申请日：2008-06-13

Applicant: Rahul Garg ,  Patrick Duvaut ,  Amitkumar Mahadevan ,  Harish Jethanandani

Inventor： Rahul Garg ,  Patrick Duvaut ,  Amitkumar Mahadevan ,  Harish Jethanandani

IPC: H04K1/10 ,  H04L27/28 ,  H04M11/06

CPC classification number: H04M11/062

Abstract: Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique.

Abstract translation: 用于降低发射机峰值平均比（PAR）的系统和方法可以减少各种模拟组件所需的动态范围。 可以通过应用时域补偿信号来减小PAR，该时域补偿信号在时域补偿信号使用为了减少PAR的目的而被保留的音调的同时减小时域信号中的峰值的幅度。 可以通过改变数字用户线（xDSL）系统中的典型启动过程来实现用于PAR的这些保留音调的预留。 可以使用低复杂度算法或使用自适应技术来实现使用保留的音调来减少PAR。

公开(公告)号：US08576690B2

公开(公告)日：2013-11-05

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: H04J1/12

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减轻系数的受害线路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重新调整自FEXT缓解系数以在施加学习的线性组合器之后去除受害线上的任何残余自FEXT。

公开(公告)号：US08509389B2

公开(公告)日：2013-08-13

申请号：US12044443

申请日：2008-03-07

Applicant: Patrick Duvaut ,  Amitkumar Mahadevan ,  Vaibhav Dinesh

Inventor： Patrick Duvaut ,  Amitkumar Mahadevan ,  Vaibhav Dinesh

IPC: H04M3/22

CPC classification number: H04M3/302 ,  H04M3/085

Abstract: Systems and methods for performing loop length estimation are described. One embodiment includes 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 characteristics of the echo signal to perform a loop length estimation based on data relating to ripple frequency as a function of loop length.

Abstract translation: 描述了用于执行环路长度估计的系统和方法。 一个实施例包括一种方法，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的特性，以便根据与纹波频率相关的数据作为循环长度的函数来执行环路长度估计。

公开(公告)号：US08396688B2

公开(公告)日：2013-03-12

申请号：US12348565

申请日：2009-01-05

Applicant: Hemant Kumar Samdani ,  Kunal Raheja ,  Rahul Garg ,  Amitkumar Mahadevan ,  Patrick Duvaut

Inventor： Hemant Kumar Samdani ,  Kunal Raheja ,  Rahul Garg ,  Amitkumar Mahadevan ,  Patrick Duvaut

IPC: G06F17/18 ,  H04B15/00 ,  H04Q1/20 ,  G01R29/26

CPC classification number: H04B3/46

Abstract: Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines (DSL). The characterization of the nature, timing and length of impulse noise sources present on a DSL loop is a critical first step in mitigating the effect of impulse noise on DSL communications. DSL standards provide histograms for impulse length and inter-arrival time of impulses. These histograms can be used to derive the nature, maximum frequency and other statistics related to impulse noise on a DSL line.

Abstract translation: 来自附近或强电场的脉冲噪声可能会扰乱通过数字用户线路（DSL）的通信。 存在于DSL环路上的脉冲噪声源的性质，时间和长度的表征是减轻脉冲噪声对DSL通信的影响的关键的第一步。 DSL标准提供脉冲长度和脉冲到达间隔时间的直方图。 这些直方图可用于导出与DSL线路上的脉冲噪声有关的性质，最大频率和其他统计。

公开(公告)号：US20120275591A1

公开(公告)日：2012-11-01

申请号：US13458865

申请日：2012-04-27

Applicant: Amitkumar Mahadevan ,  Kevin D. Fisher ,  Nicholas P. Sands

Inventor： Amitkumar Mahadevan ,  Kevin D. Fisher ,  Nicholas P. Sands

IPC: H04M1/76

CPC classification number: H04M11/062 ,  H04B3/32

Abstract: Methods, apparatuses (e.g., DSL system hardware, DSL systems, vectoring control entities), techniques, systems, etc. are used for initializing one or more DSL lines joining a vectored DSL line group operating in Showtime. A super-periodic orthogonal pilot sequence from a set of super-periodic orthogonal pilot sequences is assigned to each joining DSL line, wherein each such super-periodic orthogonal pilot sequence in the set has length L and is orthogonal to other sequences in the set over length T. These super-periodic orthogonal pilot sequences are used on the joining DSL lines to generate at least T sync-symbols worth of initialization data, which is processed to generate initialization data and FEXT mitigation coefficients for use when the joining DSL lines become part of the vectored DSL line group.

Abstract translation: 方法，装置（例如，DSL系统硬件，DSL系统，向量控制实体），技术，系统等用于初始化连接在Showtime中操作的向量DSL线路组的一个或多个DSL线路。 从一组超周期正交导频序列的超周期正交导频序列被分配给每个加入DSL线，其中集合中的每个这样的超周期正交导频序列具有长度L，并且与组中的其他序列正交 这些超周期正交导频序列用于加入DSL线路以产生至少T个同步符号的初始化数据，其被处理以产生初始化数据和当加入DSL线路成为部分时使用的FEXT缓解系数 的矢量DSL线组。

公开(公告)号：US08300803B2

公开(公告)日：2012-10-30

申请号：US12100253

申请日：2008-04-09

Applicant: Pravesh Biyani ,  Amitkumar Mahadevan ,  Patrick Duvaut

Inventor： Pravesh Biyani ,  Amitkumar Mahadevan ,  Patrick Duvaut

IPC: H04M9/00 ,  H04M1/76 ,  H04M7/00

CPC classification number: H04L27/2647 ,  H04B3/32

Abstract: Included are embodiments for reducing alien crosstalk. At least one embodiment of a method includes receiving noise data associated with a first user signal on a first tone, receiving noise data associated with a second user signal on the first tone, and receiving at least one alien crosstalk canceller coefficient for the first user on the first tone. Some embodiments include applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk for the first user signal.

Abstract translation: 包括减少外来串扰的实施例。 方法的至少一个实施例包括接收与第一音调上的第一用户信号相关联的噪声数据，接收与第一音调上的第二用户信号相关联的噪声数据，以及为第一用户接收至少一个外来串扰消除器系数 第一音 一些实施例包括将至少一个外来串扰消除器系数应用于第二用户信号以减少第一用户信号的外来串扰。

公开(公告)号：US08275067B2

公开(公告)日：2012-09-25

申请号：US12139146

申请日：2008-06-13

Applicant: Rahul Garg ,  Patrick Duvaut ,  Harish Jethanandani ,  Amitkumar Mahadevan

Inventor： Rahul Garg ,  Patrick Duvaut ,  Harish Jethanandani ,  Amitkumar Mahadevan

IPC: H04L27/04 ,  H04L27/36 ,  H04B1/38

CPC classification number: H04M11/062

Abstract: Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique.

Abstract translation: 用于降低发射机峰值平均比（PAR）的系统和方法可以减少各种模拟组件所需的动态范围。 可以通过应用时域补偿信号来减小PAR，该时域补偿信号在时域补偿信号使用为了减少PAR的目的而被保留的音调的同时减小时域信号中的峰值的幅度。 可以通过改变数字用户线（xDSL）系统中的典型启动过程来实现用于PAR的这些保留音调的预留。 可以使用低复杂度算法或使用自适应技术来实现使用保留的音调来减少PAR。

公开(公告)号：US08032800B2

公开(公告)日：2011-10-04

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: G06F11/00

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：US07835368B2

公开(公告)日：2010-11-16

申请号：US12123925

申请日：2008-05-20

Applicant: Patrick Duvaut ,  Amitkumar Mahadevan ,  Pravesh Biyani ,  Shailendra Singh ,  Satyavardhan Maheshwari

Inventor： Patrick Duvaut ,  Amitkumar Mahadevan ,  Pravesh Biyani ,  Shailendra Singh ,  Satyavardhan Maheshwari

IPC: H04L12/28

CPC classification number: H04L25/03159 ,  H04B3/32 ,  H04L27/2601 ,  H04L2025/03426 ,  H04L2025/03522

Abstract: A method is described for reducing self-induced far end crosstalk (self-FEXT) in a multiple input multiple output (MIMO) digital subscriber line (xDSL) system. An initial value for an off-diagonal multiple input multiple output canceller (ODMC) is derived while the ODMC is inactive and while in data mode. The method includes activating the initial ODMC and converging towards an steady-state value for the ODMC by performing an adaptive algorithm to maximize the Shannon's capacity of the system and to reduce upstream self-FEXT. Bit loading is performed and a frequency domain equalizer (FEQ) is updated.

Abstract translation: 描述了一种用于在多输入多输出（MIMO）数字用户线（xDSL）系统中减少自感应远端串扰（self-FEXT）的方法。 导出非对角多输入多输出消除器（ODMC）的初始值，而ODMC处于非活动状态并处于数据模式。 该方法包括通过执行自适应算法来激活初始ODMC并朝向ODMC的稳态值收敛，以使香农的系统容量最大化并减少上游自FEXT。 执行位加载并更新频域均衡器（FEQ）。

公开(公告)号：US20090252234A1

公开(公告)日：2009-10-08

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: H04B1/10

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，提供与脉冲噪声源相关联的脉冲噪声源和频率的总数。 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。