公开(公告)号：US08644127B2

公开(公告)日：2014-02-04

申请号：US12713482

申请日：2010-02-26

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

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

IPC分类号： H04J1/12 ,  H04B3/32

CPC分类号： H04B3/32 ,  H04J1/12 ,  H04L2025/03414 ,  H04L2025/03426

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20120020418A1

公开(公告)日：2012-01-26

申请号：US13189095

申请日：2011-07-22

申请人： Nicholas Philip Sands ,  Stephanie Felicia Pereira ,  Darren Bradley Hutchinson ,  Kevin D. Fisher ,  Amitkumar Mahadevan

发明人： Nicholas Philip Sands ,  Stephanie Felicia Pereira ,  Darren Bradley Hutchinson ,  Kevin D. Fisher ,  Amitkumar Mahadevan

IPC分类号： H04L27/00

CPC分类号： H04B3/32

摘要： 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.

摘要翻译： 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：US08576690B2

公开(公告)日：2013-11-05

申请号：US13051906

申请日：2011-03-18

申请人： Laurent Pierrugues ,  Laurent Francis Alloin ,  Amitkumar Mahadevan

发明人： Laurent Pierrugues ,  Laurent Francis Alloin ,  Amitkumar Mahadevan

IPC分类号： H04J1/12

CPC分类号： H04B1/1027 ,  H04B3/32 ,  H04L25/03012 ,  H04L25/03159

摘要： 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.

摘要翻译： 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：US20120275591A1

公开(公告)日：2012-11-01

申请号：US13458865

申请日：2012-04-27

申请人： Amitkumar Mahadevan ,  Kevin D. Fisher ,  Nicholas P. Sands

发明人： Amitkumar Mahadevan ,  Kevin D. Fisher ,  Nicholas P. Sands

IPC分类号： H04M1/76

CPC分类号： H04M11/062 ,  H04B3/32

摘要： 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.

摘要翻译： 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：US09270831B2

公开(公告)日：2016-02-23

申请号：US13458865

申请日：2012-04-27

申请人： Amitkumar Mahadevan ,  Kevin D. Fisher ,  Nicholas P. Sands

发明人： Amitkumar Mahadevan ,  Kevin D. Fisher ,  Nicholas P. Sands

IPC分类号： H04M11/06 ,  H04B3/32

CPC分类号： H04M11/062 ,  H04B3/32

摘要： 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.

摘要翻译： 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

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

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

IPC分类号： H04J1/12 ,  H04B3/20

CPC分类号： H04B3/32

摘要： 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.

摘要翻译： 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：US20110255586A1

公开(公告)日：2011-10-20

申请号：US13081962

申请日：2011-04-07

申请人： Lin Lin Li ,  Amitkumar Mahadevan

发明人： Lin Lin Li ,  Amitkumar Mahadevan

IPC分类号： H04L27/01

CPC分类号： H04L25/03044 ,  H04L25/022 ,  H04L2025/03681

摘要： Various systems and methods are described for performing fractionally spaced time domain equalization (TEQ). One embodiment is a method implemented in a communication system for training a fractionally spaced time domain equalizer (TEQ). The method comprises performing an initialization phase, averaging a received signal in the system to reduce effects of noise in a channel, determining a channel estimate, and aligning an ideal reference signal with the received signal. The method further comprises updating a target response filter according to a non-integer multiple of a base sampling rate, determining an adaptation error based on useful information both inside and outside a Nyquist band of the TEQ, and updating the TEQ according to the adaptation error.

摘要翻译： 描述了用于执行分数间隔时域均衡（TEQ）的各种系统和方法。 一个实施例是在用于训练分数间隔的时域均衡器（TEQ）的通信系统中实现的方法。 该方法包括执行初始化阶段，对系统中的接收信号进行平均以减少信道中的噪声的影响，确定信道估计，以及使理想的参考信号与接收的信号对准。 该方法还包括根据基本采样率的非整数倍来更新目标响应滤波器，基于TEQ的奈奎斯特频带内部和外部的有用信息确定适配误差，以及根据自适应误差更新TEQ 。