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。

公开(公告)号：US20080089485A1

公开(公告)日：2008-04-17

申请号：US11865817

申请日：2007-10-02

Applicant: Patrick Duvaut ,  Amitkumar Mahadevan ,  Feng Ouyang

Inventor： Patrick Duvaut ,  Amitkumar Mahadevan ,  Feng Ouyang

IPC: H04M1/24

CPC classification number: H04M1/24

Abstract: Systems and methods for performing single-end line testing (SELT) are described. At least one embodiment includes a method for SELT to determine loop characteristics for a loop. The method for performing SELT comprises generating a test signal through a loop to be tested and receiving an echo response. The method further comprises subtracting predetermined near end echo response from the received echo to derive a far end echo response, performing time-dependent scaling on the far end echo response to compensate for loop attenuation, comparing the time-scaled far end echo response to a set of predefined templates, and providing an estimate of loop characteristics by identifying a matching template within the set of predefined templates, wherein the matching template contains information relating to loop characteristics comprising loop length and loop termination.

Abstract translation: 描述了执行单端线路测试（SELT）的系统和方法。 至少一个实施例包括用于SELT来确定循环的循环特性的方法。 用于执行SELT的方法包括通过要测试的环路产生测试信号并接收回波响应。 该方法还包括从接收到的回波中减去预定的近端回波响应以导出远端回波响应，对远端回波响应执行时间依赖的缩放以补偿环路衰减，将时间标度的远端回波响应与 一组预定义的模板，以及通过识别该组预定义模板内的匹配模板来提供循环特征的估计，其中该匹配模板包含与包括环路长度和环路终止的环路特性有关的信息。

公开(公告)号：US09270831B2

公开(公告)日：2016-02-23

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: H04M11/06 ,  H04B3/32

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：US08780686B2

公开(公告)日：2014-07-15

申请号：US13189095

申请日：2011-07-22

Applicant: Nicholas P. Sands ,  Stephanie F. Pereira ,  Darren B. Hutchinson ,  Kevin D. Fisher ,  Amitkumar Mahadevan

Inventor： Nicholas P. Sands ,  Stephanie F. Pereira ,  Darren B. Hutchinson ,  Kevin D. Fisher ,  Amitkumar Mahadevan

IPC: H04J1/12 ,  H04B3/20

CPC classification number: H04B3/32

Abstract: The memory storage, transmission and processing demands of a vectored DSL system are reduced by sampling a subset of DSL tones in the DSL tone range used in the vectored system. This data is smoothed (denoised) to further reduce the data's size, sacrificing some fidelity or precision as a result. Finally, lossless entropy coding or the like is performed to encode the FEXT cancellation data for storage and use. The resulting data is less likely to cause transmission bottlenecks in the vectored system, can be stored and used more efficiently for both on-chip and off-chip vectoring implementations, and can be readily updated in various ways.

Abstract translation: 矢量DSL系统的存储器存储，传输和处理需求通过在矢量系统中使用的DSL音调范围中采样DSL音调的子集来减少。 该数据被平滑（去噪），以进一步减少数据的大小，从而牺牲一些保真度或精度。 最后，执行无损熵编码等以对用于存储和使用的FEXT取消数据进行编码。 所得到的数据不太可能导致向量系统中的传输瓶颈，可以在片上和片外向量实现方面更有效地存储和使用，并且可以以各种方式容易地更新。

公开(公告)号：US08213536B2

公开(公告)日：2012-07-03

申请号：US12138813

申请日：2008-06-13

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

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

IPC: H04L25/49 ,  H04L23/00 ,  H04B1/38

CPC classification number: H04L27/2618

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。