公开(公告)号：US20080049855A1

公开(公告)日：2008-02-28

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。

公开(公告)号：US20080046497A1

公开(公告)日：2008-02-21

申请号：US11840547

申请日：2007-08-17

Applicant: Yue-Peng Zheng ,  Ehud Langberg ,  Wenye Yang

Inventor： Yue-Peng Zheng ,  Ehud Langberg ,  Wenye Yang

IPC: G06F7/38 ,  G06F1/16

CPC classification number: G06F7/5324 ,  G06F2207/382

Abstract: Systems and methods for a memory structure are described for increasing the throughput of double precision operations. Broadly, the present invention utilizes a novel memory system to process double precision data in a single memory access. In accordance with one embodiment, a method for increasing throughput of arithmetic operations on double precision data by reducing the number of memory accesses comprising: retrieving a double precision value from a memory, wherein the double precision value is comprised of a high word and a low word, wherein the double precision value is retrieved in a single memory access; selecting a word within the double precision value, wherein the portion selected is a single precision value; multiplying the word with a single precision operand to generate a single precision product; adding the product to a double precision operand to produce a double precision result; and forwarding the double precision result back to memory for storage.

Abstract translation: 描述了用于增加双精度操作的吞吐量的存储器结构的系统和方法。 广义上，本发明利用一种新颖的存储器系统来处理单个存储器访问中的双精度数据。 根据一个实施例，一种用于通过减少存储器访问的数量来增加对双精度数据的算术运算的吞吐量的方法，包括：从存储器检索双精度值，其中双精度值由高字和低字组成 单词，其中在单个存储器访问中检索所述双精度值; 选择双精度值内的单词，其中所选择的部分是单精度值; 将单词与单精度操作数相乘以生成单精度乘积; 将产品添加到双精度操作数以产生双精度结果; 并将双精度结果转发回存储器进行存储。

公开(公告)号：US07295603B2

公开(公告)日：2007-11-13

申请号：US11009710

申请日：2004-12-13

Applicant: Patrick Duvaut ,  Ehud Langberg ,  Anupama Ramalingam

Inventor： Patrick Duvaut ,  Ehud Langberg ,  Anupama Ramalingam

IPC: H04B1/38 ,  H04L5/16

CPC classification number: H04B3/32 ,  H04B3/487

Abstract: A method and apparatus implements a Virtual Exchange Reference Impact (VERI) technique to define a pattern to shape the spectrum of a cabinet deployed system to minimize its impact, e.g., FEXT, into an exchange deployed system while achieving effective cabinet system performance, e.g., in terms of data transmission rate. The invention shapes the cabinet system to replicate a self-impact of the exchange system on itself based on the known distance of the cabinet from the exchange. The shaping is required when both exchange and cabinet systems share the same bundle and exhibit overlapped bandwidths. A particular example consists of VDSL deployed from remote cabinet impacting ADSL2/ADSL2+ deployed from the exchange.

Abstract translation: 一种方法和装置实现了虚拟交换参考影响（VERI）技术，以定义一种模式来形成柜部署系统的频谱，以将其影响（例如FEXT）最小化到交换部署系统中，同时实现有效的机柜系统性能， 在数据传输率方面。 本发明根据柜与交换机的已知距离对橱柜系统进行整形以将交换系统的自身影响复制到其自身上。 交换和机柜系统共享相同的捆绑包并展示重叠的带宽时，需要进行整形。 一个特定的例子包括从远程机柜部署的VDSL，影响从交换机部署的ADSL2 / ADSL2 +。

公开(公告)号：US20070110176A1

公开(公告)日：2007-05-17

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

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：US06985548B1

公开(公告)日：2006-01-10

申请号：US09496793

申请日：2000-02-02

Applicant: Farooq Jabbar ,  Ehud Langberg ,  Weimin Liu

Inventor： Farooq Jabbar ,  Ehud Langberg ,  Weimin Liu

IPC: H04L7/00

CPC classification number: H04L27/2662 ,  H04L7/0083 ,  H04L7/065 ,  H04L27/2675 ,  H04L2025/03414

Abstract: A system and method for performing pilot tone based timing recovery in a communication system using the discrete multi-tone (DMT) modulation. In DMT modulation, interference is introduced to the phase of the pilot tone in the transmitter due to the cyclic prefix. Broadly, a receiver is configured to detect and apply a phase offset to the pilot tone in a phase locked-loop upon recognition of far-end signal segments during transceiver initialization. The output of the phase locked-loop is then used to control the timing of the analog-to-digital (A/D) and digital-to-analog (D/A) conversions. In alternative embodiments, the receiver is configured to detect and remove the cyclic prefix from the far-end signal either prior to, or after, time-domain equalization. In a similar manner, the resulting signal stream is applied to the input of the timing recovery phase locked-loop (PLL). The output of the PLL is used to control the timing of the A/D and D/A converters. In a further alternative embodiment, a phase error on the pilot tone is estimated in the frequency domain. The phase error is then applied to the input of a modified timing recovery PLL to reduce phase interference on the pilot tone.

Abstract translation: 一种用于在使用离散多音调（DMT）调制的通信系统中执行导频音定时恢复的系统和方法。 在DMT调制中，由于循环前缀，干扰被引入发射机中的导频音的相位。 广义上，接收机被配置为在收发机初始化期间识别远端信号段时，在锁相环中检测并应用相位偏移到导频音。 然后，锁相环的输出用于控制模数（A / D）和数模（D / A）转换的时序。 在替代实施例中，接收机被配置为在时域均衡之前或之后从远端信号检测和去除循环前缀。 以类似的方式，将所得信号流施加到定时恢复锁相环（PLL）的输入端。 PLL的输出用于控制A / D和D / A转换器的时序。 在另一替代实施例中，在频域中估计导频音上的相位误差。 然后将相位误差施加到经修改的定时恢复PLL的输入，以减少导频音上的相位干扰。

公开(公告)号：US06879625B1

公开(公告)日：2005-04-12

申请号：US09863164

申请日：2001-05-21

Applicant: Robin Levonas ,  Ehud Langberg

Inventor： Robin Levonas ,  Ehud Langberg

IPC: H04B17/40 ,  H04B17/02

CPC classification number: H04B17/40

Abstract: A system and method for providing cancellation of interference in a repeater configuration is disclosed, wherein the repeater is located between a first endpoint and a second endpoint. A data signal received from the first end point is amplified in accordance with an amount of power required to drive the data signal to the second endpoint. Local echo introduced by the repeater is then removed from the amplified data signal. Coupled signals introduced by the repeater are then removed after which the data signal is transmitted to the second endpoint.

Abstract translation: 公开了一种用于提供中继器配置中的干扰消除的系统和方法，其中中继器位于第一端点和第二端点之间。 从第一端点接收的数据信号根据将数据信号驱动到第二端点所需的功率量被放大。 然后从放大的数据信号中去除由中继器引入的本地回波。 然后去除由中继器引入的耦合信号，之后将数据信号发送到第二端点。

公开(公告)号：US06243425B1

公开(公告)日：2001-06-05

申请号：US09005645

申请日：1998-01-12

Applicant: Ehud Langberg ,  Richard Gut

Inventor： Ehud Langberg ,  Richard Gut

IPC: H04B1500

CPC classification number: H04L25/03343 ,  H04L25/03057

Abstract: An adaptive preceding system is implemented within a data communications system in order to precode data to track changes in a communications channel. The adaptive precoding system initializes a set of precoder values within a precoder filter of a transmitter during an initialization phase. The precoder filter is used to create a precoding signal that is combined with a transmission data signal in order to compensate for distortions on a communications channel. During a communications phase, a decision feedback equalizer generates equalizer coefficients that correspond to changes on the communications channel. The equalizer coefficients are periodically transmitted to a converter within the transmitter over a secondary channel. The converter determines a new set of precoder values that compensate for the changes in the communications channel and slowly updates the values in the precoder filter until they match the new set of precoder values. While the precoder values are being updated, the decision feedback equalizer updates the equalizer coefficient values to reflect the improvements realized by updating the precoder values.

Abstract translation: 在数据通信系统内实现自适应前一系统，以便对数据进行预编码以跟踪通信信道中的变化。 自适应预编码系统在初始化阶段期间初始化发射机的预编码器滤波器内的一组预编码器值。 预编码器滤波器用于创建与传输数据信号组合的预编码信号，以便补偿通信信道上的失真。 在通信阶段期间，判决反馈均衡器产生对应于通信信道上的变化的均衡器系数。 均衡器系数通过次级信道周期性地发送到发射机内的转换器。 转换器确定一组新的预编码器值，以补偿通信通道的变化，并缓慢更新预编码器滤波器中的值，直到它们匹配新的一组预编码器值。 当正在更新预编码器值时，判决反馈均衡器更新均衡器系数值以反映通过更新预编码器值而实现的改进。

公开(公告)号：US06219386B1

公开(公告)日：2001-04-17

申请号：US09113468

申请日：1998-07-10

Applicant: Daniel Amrany ,  Xian-Ying Chen ,  Ehud Langberg ,  William Scholtz

Inventor： Daniel Amrany ,  Xian-Ying Chen ,  Ehud Langberg ,  William Scholtz

IPC: H04L2302

CPC classification number: H04L1/0054 ,  H04L1/0041 ,  H04L1/0065

Abstract: An improvement to a Reed Solomon (RS) coding scheme wherein the RS encoder and decoder is initiated based upon counting a number of timing, baud, or byte cycles from a known time stamp. The time stamp can be for example, a Tomlinson coefficient exchange frame whereby at the end of a Tomlinson coefficient exchange frame, a counter in both transmitter and receiver is actuated to begin counting a number of baud cycles. Alternatively, the counter may be initiated upon the receipt of a particular byte. Once the appropriate number of baud cycles or bytes have elapsed, the RS encoder and decoder will begin operation, thus ensuring that both RS encoding and decoding occur at the proper time, without the use of any additional framing bits.

Abstract translation: 对里德所罗门（RS）编码方案的改进，其中基于从已知时间戳计数定时，波特或字节周期的数量来启动RS编码器和解码器。 时间戳可以是例如Tomlinson系数交换帧，由此在Tomlinson系数交换帧结束时，致动发送器和接收器中的计数器以开始计数多个波特周期。 或者，可以在接收到特定字节时启动计数器。 一旦经过适当数量的波特率周期或字节，RS编码器和解码器将开始运行，从而确保RS编码和解码都在适当的时间发生，而不需要使用任何附加的成帧位。

公开(公告)号：US5748686A

公开(公告)日：1998-05-05

申请号：US628220

申请日：1996-04-04

Applicant: Ehud Langberg ,  Jin-Der Wang

Inventor： Ehud Langberg ,  Jin-Der Wang

IPC: H04H20/46 ,  H04H20/72 ,  H04H40/27 ,  H04J3/06 ,  H04L25/03 ,  H04L7/00

CPC classification number: H04H20/46 ,  H04H40/27 ,  H04L25/03133 ,  H04H20/72 ,  H04H2201/20 ,  H04L7/08

Abstract: In a digital audio broadcasting (DAB) system having a radio-frequency (RF) transmitter and a corresponding RF receiver, a system and method for providing improved frame synchronization is provided. In accordance with the preferred embodiment, the RF transmitter formats a DAB signal into a sequence of frames, each frame having a header with a predefined grouping of psuedo-random number sequences comprising 100 symbols. Of these 100 symbols, 86 symbols of the header preferable are used for frame synchronization and characterization of a communications channel, while the remaining 14 symbols are used for interleaver and data synchronization in an interleaved fashion. The formatted DAB signal, including the frame sequences, is transmitted to the receiver preferably using quadrature phase-shift keying modulation. At the receiver, a correlator, utilizing a synchronization detection algorithm, is generally designed to match a predetermined symbol pattern within the received signal. Once the frame synchronization is established, the channel is characterized and the data symbols are recovered.

Abstract translation: 在具有射频（RF）发射机和对应的RF接收机的数字音频广播（DAB）系统中，提供了一种用于提供改进的帧同步的系统和方法。 根据优选实施例，RF发射机将DAB信号格式化成帧序列，每帧具有包含100个符号的伪随机数序列的预定义分组的报头。 在这100个符号中，优选的标题的86个符号用于通信信道的帧同步和表征，而剩余的14个符号以交织方式用于交织器和数据同步。 包括帧序列的格式化的DAB信号优选地使用正交相移键控调制发送到接收机。 在接收机处，通常设计利用同步检测算法的相关器，以匹配接收信号内的预定码元模式。 一旦建立了帧同步，就对信道进行表征，并恢复数据符号。

公开(公告)号：US5732112A

公开(公告)日：1998-03-24

申请号：US579713

申请日：1995-12-28

Applicant: Ehud Langberg

Inventor： Ehud Langberg

IPC: H03H21/00 ,  H04B1/10 ,  H04B1/76 ,  H04B3/10 ,  H04L25/03 ,  H04L27/01

CPC classification number: H04L25/03057

Abstract: In a multi-channel receiver system embodying the invention, a "trained" receiver channel which is active and propagating data signals may be used to train any other receiver channel. Each receiver channel of the system has an input and an output, with each input for receiving a different portion of an original data signal. Each receiver channel includes adaptive filter coupled between its input and its output for propagating the signals received at its input to its output. In accordance with the invention, a first trained receiver channel is used to train a second receiver channel by coupling the output of the first receiver channel to the output of the second receiver channel for training the adaptive filter of the second receiver channel. The training of the second receiver is completed by transmitting the same data signal to the first and second receiver channels.

Abstract translation: 在体现本发明的多通道接收机系统中，可以使用作为有源和传播数据信号的“经过训练”的接收机信道来训练任何其它接收机信道。 系统的每个接收器通道具有输入和输出，每个输入用于接收原始数据信号的不同部分。 每个接收机通道包括耦合在其输入端和其输出端之间的自适应滤波器，用于将在其输入处接收到的信号传播到其输出端。 根据本发明，第一训练的接收机信道用于通过将第一接收机信道的输出耦合到第二接收机信道的输出来训练第二接收机信道，用于训练第二接收机信道的自适应滤波器。 通过将相同的数据信号发送到第一和第二接收机信道来完成第二接收机的训练。