公开(公告)号：US5852630A

公开(公告)日：1998-12-22

申请号：US50474

申请日：1998-03-30

Applicant: Ehud Langberg ,  William Scholtz ,  Farooq Jabbar

Inventor： Ehud Langberg ,  William Scholtz ,  Farooq Jabbar

IPC: H04L25/03 ,  H04L27/26 ,  H04B1/38 ,  H03H7/30 ,  H03H7/40 ,  H04L5/16

CPC classification number: H04L27/2647 ,  H04L2025/03668

Abstract: A DSL communication device wherein the state of component coefficients are saved in a memory of a DSL device so that at a later time, the DSL device may initiate a warm start activation sequence wherein the last known channel parameters are used to train the equalizer, significantly reducing the amount of equalizer training required by eliminating the requirement that the aforementioned coefficients be transferred between DSL devices.

Abstract translation: 一种DSL通信设备，其中分量系数的状态被保存在DSL设备的存储器中，使得在稍后的时间，DSL设备可以启动热启动激活序列，其中最后的已知信道参数用于训练均衡器，显着地 通过消除上述系数在DSL设备之间传送的要求，减少所需的均衡器训练量。

公开(公告)号：US5751701A

公开(公告)日：1998-05-12

申请号：US690243

申请日：1996-07-19

Applicant: Ehud Langberg ,  William Henry Scholtz

Inventor： Ehud Langberg ,  William Henry Scholtz

IPC: H04L5/02 ,  H04L5/14 ,  H04L7/04 ,  H04J1/00

CPC classification number: H04L7/041 ,  H04L5/023 ,  H04L5/143 ,  H04L7/043 ,  H04L7/044

Abstract: The invention provides a transceiver which is preferably used for high speed communications between a customer location and a central office over a subscriber line. The transceiver uses a pseudorandom noise generator both to provide a correlation for a complementary transceiver to use in achieving synchronization and as a way to transmit data in an extremely robust fashion. In addition, the transceiver uses frequency domain multiplexing so that downstream data and upstream data are transmitted by their respective transceivers in completely separate and distinct frequency bands. In order to achieve high data transfer rates, the transceivers can operate in an asymmetrical manner, whereby either (but, typically, the central office) transceiver can transmit data at a higher rate than the other transceiver.

Abstract translation: 本发明提供一种收发器，其优选地用于在用户线路上的客户位置和中心局之间的高速通信。 收发器使用伪随机噪声发生器来提供互补收发器的相关性，以用于实现同步，并且作为以非常鲁棒的方式传输数据的方式。 此外，收发器使用频域复用，使得下行数据和上行数据由它们各自的收发器以完全分离和不同的频带发送。 为了实现高数据传输速率，收发器可以以非对称方式操作，由此（但是，通常，中心局）收发器可以以比另一个收发器更高的速率发送数据。

公开(公告)号：US5703905A

公开(公告)日：1997-12-30

申请号：US602944

申请日：1996-02-16

Applicant: Ehud Langberg

Inventor： Ehud Langberg

IPC: H04L7/02 ,  H03H7/30 ,  H03H7/40

CPC classification number: H04L7/0278 ,  H04L7/0062 ,  H04L7/0083

Abstract: An "N" channel receiver system includes "N" A/D converters, one per channel, sampling the data received by their respective channels. The sampling rate of the A/D converters is controlled by a sampling clock signal generated by a timing recovery circuit. One rate of the sampling clock is a function of a timing signal applied to the timing recovery circuit. The system may be configured so that each channel produces N distinct timing signals, corresponding to the data signals received by each one of the N channels. The N distinct timing signals are coupled to a mechanism configured to selectively couple one of the N distinct timing signals to the timing recovery circuit. In a preferred embodiment, the signal-to-noise ratio (SNR) of the N received signals is sensed and the timing signal of the channel having the highest SNR is coupled via the controllable.

Abstract translation: “N”信道接收机系统包括“N”个A / D转换器，每个通道一个采样其各自信道接收的数据。 A / D转换器的采样率由定时恢复电路产生的采样时钟信号控制。 采样时钟的一个速率是施加到定时恢复电路的定时信号的函数。 该系统可以被配置为使得每个信道产生N个不同的定时信号，对应于由N个信道中的每一个接收的数据信号。 N个不同的定时信号被耦合到被配置为选择性地将N个不同定时信号之一耦合到定时恢复电路的机构。 在优选实施例中，感测N个接收信号的信噪比（SNR），并且具有最高SNR的信道的定时信号通过可控的耦合。

公开(公告)号：US5513216A

公开(公告)日：1996-04-30

申请号：US322877

申请日：1994-10-13

Applicant: Shlomo Gadot ,  Gi-Hong Im ,  Ehud Langberg ,  Jin-Der Wang

Inventor： Shlomo Gadot ,  Gi-Hong Im ,  Ehud Langberg ,  Jin-Der Wang

IPC: H03H21/00 ,  H04B3/14 ,  H04L25/03 ,  H04L25/497 ,  H04L27/01

CPC classification number: H04L25/4975 ,  H04L25/03057 ,  H04L25/03343 ,  H04L25/497 ,  H04L2025/03503 ,  H04L2025/03808

Abstract: A hybrid type of decision feedback equalizer (DFE) structure that approaches optimal DFE performance is described. The hybrid DFE includes both an intersymbol interference DFE (ISI-DFE) and a noise predictive DFE (NP-DFE). The hybrid DFE structure is designed so that one form of tap values dominates over the other. This allows only the dominate tap values to be used by the transmitter during precoding and reduces the transmitter complexity. In particular, a hybrid DFE is designed so that the I(z) coefficient values dominate over the N(z) coefficient values, where the notation I(z) and N(z), as known in the art, represent the resulting coefficient values after adaptation of the ISI-DFE and the NP-DFE, respectively. A respective Tomlinson precoding scheme in the transmitter uses only the I(z) values. Since only the I(z) values are used in the precoder of the transmitter, the NP-DFE of the receiver is kept active during the communications phase. Conveniently, the continued use of the NP-DFE in the receiver allows the receiver to track small changes in the channel.

Abstract translation: 描述了接近最优DFE性能的混合型判决反馈均衡器（DFE）结构。 混合DFE包括符号间干扰DFE（ISI-DFE）和噪声预测DFE（NP-DFE）。 混合DFE结构被设计成使得一种形式的抽头值占主导地位。 这只允许发射机在预编码期间使用主要抽头值，并降低发射机的复杂度。 特别地，混合DFE被设计为使得I（z）系数值在N（z）系数值上占优势，其中本领域已知的符号I（z）和N（z）表示所得系数 分别适应ISI-DFE和NP-DFE后的值。 发射机中各自的Tomlinson预编码方案仅使用I（z）值。 由于在发射机的预编码器中仅使用I（z）值，因此接收机的NP-DFE在通信阶段保持有效。 方便地，在接收机中继续使用NP-DFE允许接收机跟踪信道中的小变化。

公开(公告)号：US08228951B2

公开(公告)日：2012-07-24

申请号：US12427698

申请日：2009-04-21

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：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：US07764752B2

公开(公告)日：2010-07-27

申请号：US10672079

申请日：2003-09-29

Applicant: Ehud Langberg ,  Patrick Duvaut ,  Peter Kleewein ,  Wolfgang Kleewein, legal representative ,  Laurent Pierrugues

Inventor： Ehud Langberg ,  Patrick Duvaut ,  Peter Kleewein ,  Laurent Pierrugues

IPC: H03D1/04 ,  H04B1/10

CPC classification number: H04L5/16 ,  H04B3/32 ,  H04L5/023

Abstract: A method and system of the present inventions reduces both near-end crosstalk (NEXT) and far-end crosstalk (FEXT) interferences due to handshake tones into upstream and downstream neighboring services, both at the customer premises equipment (CPE) and at the central office (CO), when handshake is experienced. An embodiment of the present inventions is directed to significantly reduce the NEXT and/or FEXT interferences due to handshake tones. For example, NEXT and/or FEXT interferences due to G.994.1 handshake tones, identified as, bins 7 and 9 for the Upstream channel and bins 12, 14 and 64 for the Downstream channel may be reduced. An embodiment of the present inventions provides an algorithm that may be used for both NEXT and FEXT Handshake Interferences reduction at the CO and at the CPE. In addition, the algorithm may operate in the time domain and in the frequency domain. Frequency domain algorithm offers two options, both versions taking advantage of the high correlation time of the Handshake tone signals.

Abstract translation: 本发明的方法和系统将客户端设备（CPE）和中央处理器（CPE）处的上下游相邻服务期间由于握手音调的近端串扰（NEXT）和远端串扰（FEXT）干扰减少 办公室（CO），握手时经历。 本发明的实施例旨在显着地减少由于握手音而引起的NEXT和/或FEXT干扰。 例如，可以减少由于G.994.1握手音调而导致的NEXT和/或FEXT干扰，被识别为用于上行信道的分组7和9以及用于下行信道的分组12,14和64。 本发明的一个实施例提供了一种算法，其可以用于在CO和CPE处的NEXT和FEXT握手干扰减少。 另外，该算法可以在时域和频域中操作。 频域算法提供两个选项，两个版本利用握手音信号的高相关时间。

公开(公告)号：US20090219979A1

公开(公告)日：2009-09-03

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：US07496135B2

公开(公告)日：2009-02-24

申请号：US11849618

申请日：2007-09-04

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：US07272172B2

公开(公告)日：2007-09-18

申请号：US10714907

申请日：2003-11-18

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行掩码（U 1，U 2）和两个下行掩码（D 1，D 2）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 调制解调器功能在握手期间被激活，以便在频谱兼容性方面自动检查物理层状态，因此使用掩模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/下游屏蔽的最佳组合 。