公开(公告)号：US06741701B1

公开(公告)日：2004-05-25

申请号：US10014315

申请日：2001-12-11

Applicant: Ehud Barak ,  Ehud Langberg

Inventor： Ehud Barak ,  Ehud Langberg

IPC: H04M100

CPC classification number: H04B3/237

Abstract: In accordance with one aspect of the invention, an apparatus is provided having a transmit path and a receive path for communicating data. The apparatus includes an analog to digital (A/D) converter that is disposed in communication with the receive path. The A/D converter operates at a first sampling rate, and it converts a received analog signal into a digital signal. The apparatus also includes a first echo canceller that is in communication with the receive path and that operates at the first sampling rate for estimating a first portion of an echo signal leaking from the transmit path to the receive path. The estimated echo signal is subtracted from the digital signal. The amplitude of the digital signal is increased by a digital gain. A decimator is disposed in communication with the receive path, whereby the decimator filters the digital signal that has a first sampling rate and emits a signal output at a reduced sampling rate. Thereafter, a second echo canceller is in communication with the output from the decimator for generating an echo replica estimation of a second portion of echo signal leaking from said transmit path to said receive path. The second portion of echo signal leaking from said transmit path to said receive path is subtracted from the output from the decimator. The result is a substantially echo-free digital data signal.

Abstract translation: 根据本发明的一个方面，提供一种具有用于传送数据的发送路径和接收路径的装置。 该装置包括与接收路径通信设置的模数（A / D）转换器。 A / D转换器以第一采样率工作，并将接收到的模拟信号转换为数字信号。 该装置还包括与接收路径通信并且以第一采样率操作以估计从发射路径泄漏到接收路径的回波信号的第一部分的第一回波消除器。 从数字信号中减去估计的回波信号。 数字信号的幅度增加数字增益。 抽取器被布置成与接收路径通信，由此抽取器对具有第一采样率的数字信号进行滤波并以降低的采样率发射信号输出。 此后，第二回波消除器与来自抽取器的输出通信，用于产生从所述发送路径泄漏到所述接收路径的回波信号的第二部分的回波复制估计。 从所述抽取器的输出中减去从所述发送路径泄漏到所述接收路径的回波信号的第二部分。 结果是基本上无回波的数字数据信号。

公开(公告)号：US08532147B2

公开(公告)日：2013-09-10

申请号：US13554861

申请日：2012-07-20

Applicant: William Scholtz ,  Ben Chan ,  Ehud Langberg ,  Shareq Rahman ,  Xy Chen ,  James Zhang

Inventor： William Scholtz ,  Ben Chan ,  Ehud Langberg ,  Shareq Rahman ,  Xy Chen ,  James Zhang

IPC: H04J1/02 ,  H04M11/00

CPC classification number: H04M3/4281 ,  H04M3/02 ,  H04M3/18 ,  H04M3/42365 ,  H04M7/006 ,  H04M2203/156

Abstract: A method and system are provided for preventing data loss in a VoIP system. In particular, during a VoIP call, it is determined whether incoming ringing on a POTS line causes an unacceptable level of signal loss or errors. If so, for subsequent VoIP calls, the CO handling calls to the POTS line is instructed to either answer each call with a busy signal or automatically forward calls to the POTS line to the VoIP line or other selected telephone. Calling returns to normal upon ending of the VoIP call. In this manner, incoming ringing on the POTS line does not result in call dropping or lengthy retraining processes.

Abstract translation: 提供了一种防止VoIP系统中的数据丢失的方法和系统。 特别地，在VoIP呼叫期间，确定POTS线上的输入振铃是否导致不可接受的信号丢失或错误的水平。 如果是这样，对于随后的VoIP呼叫，指示对POTS线路的CO处理呼叫以忙信号来应答每个呼叫，或者自动将呼叫转移到VoIP线路或其他所选电话的POTS线路。 呼叫结束时呼叫恢复正常。 以这种方式，POTS线路上的呼入不会导致呼叫丢失或冗长的再训练过程。

公开(公告)号：US07813434B2

公开(公告)日：2010-10-12

申请号：US11559772

申请日：2006-11-14

Applicant: Yan Wu ,  Lujing Cai ,  William Scholtz ,  Ehud Langberg

Inventor： Yan Wu ,  Lujing Cai ,  William Scholtz ,  Ehud Langberg

IPC: H04K1/10 ,  H04L27/28

CPC classification number: H04L27/2608 ,  H04L1/0006 ,  H04L1/0009 ,  H04L1/0057 ,  H04L1/0058 ,  H04L1/006 ,  H04L1/007 ,  H04L5/14

Abstract: Systems and methods for performing bit loading in a dual latency data transmission system. In a computer network, such as an XDSL-based network, carrier channels are allocated between two latency paths. Error sensitive information is transmitted over a latency path employing one or more forward error correction techniques. Latency sensitive information that is relatively more tolerant of errors is transmitted over the other latency path. Rather than employing the lowest coding gain for carrier channels having the two different latency paths, the highest coding gain for each path is used by applying different target S-N-R margins for carrier channels having different latency paths.

Abstract translation: 用于在双延迟数据传输系统中执行比特加载的系统和方法。 在诸如基于XDSL的网络的计算机网络中，在两个等待时间路径之间分配载波信道。 误差敏感信息通过采用一个或多个前向纠错技术的等待时间路径传输。 通过另一个等待时间路径发送相对更容忍错误的延迟敏感信息。 不是对具有两个不同等待时间路径的载波信道采用最低的编码增益，而是通过对具有不同等待时间路径的载波信道应用不同的目标S-N-R边缘来使用每个路径的最高编码增益。

公开(公告)号：US07352805B2

公开(公告)日：2008-04-01

申请号：US11282109

申请日：2005-11-18

Applicant: Ehud Langberg ,  Lujing Cai

Inventor： Ehud Langberg ,  Lujing Cai

IPC: H03H7/30

CPC classification number: H04L5/1438 ,  H04B17/0085 ,  H04L25/03012 ,  H04L25/03019 ,  H04L27/2602 ,  H04L27/2607 ,  H04L27/2628 ,  H04L27/265 ,  H04L2025/03414 ,  H04L2025/03445 ,  H04L2025/03585

Abstract: A method and system for enhancing reach-performance of a multi-carrier VDSL System estimates loop length, estimates maximum available bandwidth that can be utilized at that particular loop length, optimally selects an FFT size and sampling rate, and decides whether to apply a time domain equalization to its receiver and if so, selects a cyclic extension size. To minimize the implementation complexity, the sampling frequencies at receiver and transmitter are lowered to match the actual usable bandwidth. The FFT/IFFT sizes in the implementation are also required to set appropriately accordingly.

Abstract translation: 一种用于增强多载波VDSL系统的达到性能的方法和系统估计环路长度，估计可以在该特定环路长度下使用的最大可用带宽，最佳地选择FFT大小和采样率，并且决定是否应用时间 域均衡到其接收器，如果是，则选择循环扩展大小。 为了最小化实现复杂度，降低接收机和发射机的采样频率以匹配实际可用带宽。 执行中的FFT / IFFT大小也需要适当地进行设置。

公开(公告)号：US20050010853A1

公开(公告)日：2005-01-13

申请号：US10860286

申请日：2004-06-04

Applicant: Patrick Duvant ,  Ehud Langberg ,  Julien Pons ,  William Sholtz

Inventor： Patrick Duvant ,  Ehud Langberg ,  Julien Pons ,  William Sholtz

IPC: H03M13/25 ,  H04L1/00 ,  H03D3/22 ,  H03M13/03 ,  H04L27/22

CPC classification number: H04L1/006 ,  H03M13/255 ,  H03M13/256 ,  H03M13/635 ,  H04L1/0041 ,  H04L1/0066 ,  H04L1/007

Abstract: Disclosed herein are various techniques for multilevel channel coding. For a given binary word comprising a plurality of bits, the least-significant bit may be encoded by a boosted coding technique, such as turbo channel coding or low density parity check (LDPC) channel coding. A subset of the remaining bits of the binary word may be encoded using trellis coded modulation (TCM) coding. The results of the boosted channel coding and the TCM coding may be mapped to one or more symbols. The one or more symbols then may be transmitted to a receiver using transmission techniques well known to those skilled in the art. The present invention finds particular benefit in digital subscriber line (DSL)-based systems in accord with the ITU G.992-1 Recommendation and similar standards.

Abstract translation: 这里公开了用于多电平信道编码的各种技术。 对于包括多个位的给定二进制字，最低有效位可以通过诸如turbo信道编码或低密度奇偶校验（LDPC）信道编码的增强编码技术来编码。 可以使用网格编码调制（TCM）编码对二进制字的剩余位的子集进行编码。 增强的信道编码和TCM编码的结果可以映射到一个或多个符号。 然后可以使用本领域技术人员公知的传输技术将一个或多个符号发送到接收机。 本发明在符合ITU G.992-1建议书和类似标准的基于数字用户线路（DSL）的系统中特别有益。

公开(公告)号：US06829251B2

公开(公告)日：2004-12-07

申请号：US10315743

申请日：2002-12-10

Applicant: Patrick Duvaut ,  Ehud Langberg ,  William Scholtz ,  Laurent Pierrugues ,  Oliver Moreno

Inventor： Patrick Duvaut ,  Ehud Langberg ,  William Scholtz ,  Laurent Pierrugues ,  Oliver Moreno

IPC: H04J116

CPC classification number: H04L12/66 ,  H04L27/2608 ,  H04L27/2647 ,  H04L47/10 ,  H04L47/38 ,  H04M11/062 ,  H04Q2213/13039 ,  H04Q2213/13176 ,  H04Q2213/1319 ,  H04Q2213/13191 ,  H04Q2213/13209 ,  H04Q2213/13389

Abstract: Systems and methods for increasing data capacity in communication systems is presented. In one embodiment, line characteristics are determined, and a downstream bandwidth is adaptively allocated in response to the determined line characteristics. In this regard, the upstream and downstream bandwidths may be seen as adaptively changing as a function of line characteristics.

Abstract translation: 介绍了增加通信系统数据容量的系统和方法。 在一个实施例中，确定线路特性，响应于所确定的线路特性，自适应地分配下行带宽。 在这方面，上行和下行带宽可以看作是根据线路特性的自适应变化。

公开(公告)号：US20120287923A1

公开(公告)日：2012-11-15

申请号：US13554861

申请日：2012-07-20

Applicant: William Scholtz ,  Ben Chan ,  Ehud Langberg ,  Shareq Rahman ,  Xy Chen ,  James Zhang

Inventor： William Scholtz ,  Ben Chan ,  Ehud Langberg ,  Shareq Rahman ,  Xy Chen ,  James Zhang

IPC: H04L12/66

CPC classification number: H04M3/4281 ,  H04M3/02 ,  H04M3/18 ,  H04M3/42365 ,  H04M7/006 ,  H04M2203/156

Abstract: A method and system are provided for preventing data loss in a VoIP system. In particular, during a VoIP call, it is determined whether incoming ringing on a POTS line causes an unacceptable level of signal loss or errors. If so, for subsequent VoIP calls, the CO handling calls to the POTS line is instructed to either answer each call with a busy signal or automatically forward calls to the POTS line to the VoIP line or other selected telephone. Calling returns to normal upon ending of the VoIP call. In this manner, incoming ringing on the POTS line does not result in call dropping or lengthy retraining processes.

Abstract translation: 提供了一种防止VoIP系统中的数据丢失的方法和系统。 特别地，在VoIP呼叫期间，确定POTS线上的输入振铃是否导致不可接受的信号丢失或错误的水平。 如果是这样，对于随后的VoIP呼叫，指示对POTS线的CO处理呼叫以忙信号来应答每个呼叫，或者自动将呼叫转移到VoIP线路或其他所选电话的POTS线路。 呼叫结束时呼叫恢复正常。 以这种方式，POTS线路上的呼入不会导致呼叫丢失或冗长的再训练过程。

公开(公告)号：US08126038B2

公开(公告)日：2012-02-28

申请号：US12392039

申请日：2009-02-24

Applicant: Patrick Duvaut ,  Ehud Langberg

Inventor： Patrick Duvaut ,  Ehud Langberg

IPC: H04B1/38

CPC classification number: H04Q11/04 ,  H04Q2213/13039 ,  H04Q2213/13094 ,  H04Q2213/13204 ,  H04Q2213/13396

Abstract: The present invention overcomes various problems by defining two upstream masks (U1, U2) and two downstream masks (D1, D2) and using a mask selectable system for the long reach digital subscriber line (LDSL), in which a unique modem feature is activated during handshake to automatically check for physical layer status in terms of spectral compatibility and, thus, automatically optimize the boosted mode with the use of the mask selectable system choose the best combination of upstream/downstream masks in any physical layer noise scenario.

Abstract translation: 本发明通过定义两个上游掩码（U1，U2）和两个下行掩码（D1，D2）并使用用于长距离数字用户线（LDSL）的掩码可选择系统来克服各种问题，其中唯一的调制解调器特征被激活 在握手期间，根据频谱兼容性自动检查物理层状态，因此，使用掩码可选择系统自动优化升压模式，在任何物理层噪声场景中选择上游/下游掩码的最佳组合。

公开(公告)号：US20110200140A1

公开(公告)日：2011-08-18

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: H04L25/49

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：US07957477B2

公开(公告)日：2011-06-07

申请号：US11845040

申请日：2007-08-25

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: Systems and methods for off-diagonal MIMO precoders are described. At least one embodiment includes a method for precoding data for transmission in a discrete multi-tone (DMT) xDSL system to cancel self-induced far end crosstalk (self-FEXT) comprising: learning characteristics associated with a plurality of N users within the xDSL system to determine an initial off-diagonal multiple input multiple output (MIMO) precoder (ODMP) for a given tone frequency; and converging towards an optimum ODMP from the initial ODMP in order to cancel downstream self-FEXT for the plurality of N users, wherein the ODMP is represented as a zero diagonal matrix with only off-diagonal terms, and wherein the converging towards the optimum ODMP comprises: maximizing the channel capacity for the plurality of N users for the given tone frequency; and minimizing an increase in transmit power of the xDSL system relative to an original transmit power where a precoder is not active.

Abstract translation: 描述了非对角MIMO预编码器的系统和方法。 至少一个实施例包括用于预编码用于在离散多音（DMT）xDSL系统中传输的数据以消除自感应远端串扰（self-FEXT）的方法，包括：与xDSL内的多个N个用户相关联的学习特征 系统确定用于给定音频的初始非对角多输入多输出（MIMO）预编码器（ODMP）; 并从最初的ODMP收敛到最佳的ODMP，以消除多个N个用户的下游自身FEXT，其中ODMP被表示为只有非对角项的零对角矩阵，并且其中朝向最佳ODMP 包括：使给定音调频率的多个N个用户的信道容量最大化; 并且最小化xDSL系统相对于预编码器不活动的原始发射功率的发射功率的增加。