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1.发明授权公开(公告)号：US07835368B2
公开(公告)日：2010-11-16
申请号：US12123925
申请日：2008-05-20
申请人： Patrick Duvaut , Amitkumar Mahadevan , Pravesh Biyani , Shailendra Singh , Satyavardhan Maheshwari
发明人： Patrick Duvaut , Amitkumar Mahadevan , Pravesh Biyani , Shailendra Singh , Satyavardhan Maheshwari
IPC分类号： H04L12/28
CPC分类号： H04L25/03159 , H04B3/32 , H04L27/2601 , H04L2025/03426 , H04L2025/03522
摘要： 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.
摘要翻译： 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）。
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2.发明申请公开(公告)号：US20090122855A1
公开(公告)日：2009-05-14
申请号：US12123925
申请日：2008-05-20
申请人： Patrick Duvaut , Amitkumar Mahadevan , Pravesh Biyani , Shailendra Singh , Satyavardhan Maheshwari
发明人： Patrick Duvaut , Amitkumar Mahadevan , Pravesh Biyani , Shailendra Singh , Satyavardhan Maheshwari
CPC分类号： H04L25/03159 , H04B3/32 , H04L27/2601 , H04L2025/03426 , H04L2025/03522
摘要： Systems and methods for mitigating the effects of self-FEXT within an xDSL system are described. At least one embodiment is a method for reducing self-induced far end crosstalk (self-FEXT) in a multiple input multiple output (MIMO) digital subscriber line (xDSL) system. The method comprises deriving an initial value for an off-diagonal multiple input multiple output canceller (ODMC) while the ODMC is inactive and while in data mode. The method further comprises 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. The method also comprises performing bit loading and updating a frequency domain equalizer (FEQ).
摘要翻译： 描述了在xDSL系统中减轻自身FEXT影响的系统和方法。 至少一个实施例是用于减少多输入多输出（MIMO）数字用户线（xDSL）系统中的自感应远端串扰（self-FEXT）的方法。 该方法包括：当ODMC处于非活动状态并处于数据模式时，得到非对角多输入多输出消除器（ODMC）的初始值。 该方法还包括通过执行自适应算法激活初始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。 该方法还包括执行比特加载和更新频域均衡器（FEQ）。
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3.发明授权Cooperative MIMO for alien noise cancellation (COMAC) for upstream VDSL systems 有权用于上游VDSL系统的外来噪声消除（COMAC）的合作MIMO公开(公告)号：US08300803B2
公开(公告)日：2012-10-30
申请号：US12100253
申请日：2008-04-09
CPC分类号： H04L27/2647 , H04B3/32
摘要： 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.
摘要翻译： 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。
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4.发明申请Cooperative MIMO for Alien Noise Cancellation (COMAC) for Upstream VDSL Systems 有权用于上行VDSL系统的外部噪声消除（COMAC）的合作MIMO公开(公告)号：US20090257581A1
公开(公告)日：2009-10-15
申请号：US12100253
申请日：2008-04-09
IPC分类号： H04M1/74
CPC分类号： H04L27/2647 , H04B3/32
摘要： 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.
摘要翻译： 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。
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5.发明授权Systems and methods for characterizing loop termination via single-ended line testing 有权通过单端线路测试来表征环路终端的系统和方法公开(公告)号：US08300771B2
公开(公告)日：2012-10-30
申请号：US12325541
申请日：2008-12-01
CPC分类号： H04M3/302
摘要： Disclosed are various embodiments for determining a state of loop termination. One embodiment comprises receiving an un-calibrated echo signal for the loop under test using frequency domain reflectometry single-ended line testing (FDR-SELT) and determining the state of loop termination based on phase of the un-calibrated echo signal. The step of determining the state of loop termination comprises determining whether the loop is terminated by an open termination or a short termination by correlating the phase of the echo signal with an expected phase of the echo signal derived from measurements taken at the same loop length for open and short terminations. For other embodiments, the amplitude of the un-calibrated echo signal is analyzed to determine whether the loop is terminated by a matched-impedance termination.
摘要翻译： 公开了用于确定环路终止状态的各种实施例。 一个实施例包括使用频域反射测试单端线测试（FDR-SELT）接收待测环路的未校准回波信号，并且基于未经校准的回波信号的相位确定环路终止状态。 确定环路终止状态的步骤包括通过将回波信号的相位与从在相同环路长度处获取的测量得到的回波信号的预期相位相关联来确定环路是否由开放终止或短终端终止， 开放和短暂终止。 对于其他实施例，分析未校准的回波信号的幅度，以确定环路是否由匹配阻抗终端终止。
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公开(公告)号：US20110200140A1
公开(公告)日：2011-08-18
申请号：US13091651
申请日：2011-04-21
IPC分类号： H04L25/49
CPC分类号： H04B3/32 , H04L1/0042
摘要： 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.
摘要翻译： 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。
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7.发明授权Systems and methods for transmit-only peak-to-average ratio reduction in the oversampled regime using reserved tones 有权使用保留色调的过采样方案中仅发送峰到峰比降低的系统和方法公开(公告)号：US07974181B2
公开(公告)日：2011-07-05
申请号：US12138731
申请日：2008-06-13
IPC分类号： H04J11/00
CPC分类号： H04L27/2618
摘要： Systems and methods for reducing the peak-to-average power 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 in the oversampled regime, using tones reserved for PAR reduction. A set of vectors corresponding to PAR tones is generated by processing out-of-phase symbols for each PAR tone to form a span matrix. The span matrix is used to find a best fit of a desired target signal to a time-domain compensation signal comprising only PAR tones.
摘要翻译： 用于降低发射机的峰均功率比（PAR）的系统和方法可以减少各种模拟组件所需的动态范围。 可以通过在过采样方案中应用时域补偿信号，使用保留给PAR减少的音调来减少PAR。 通过处理每个PAR色调的异相符号来生成对应于PAR色调的一组矢量以形成跨度矩阵。 跨度矩阵用于找到期望目标信号对仅包括PAR色调的时域补偿信号的最佳拟合。
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公开(公告)号：US07957477B2
公开(公告)日：2011-06-07
申请号：US11845040
申请日：2007-08-25
IPC分类号： H04L27/28
CPC分类号： H04B3/32 , H04L1/0042
摘要： 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.
摘要翻译： 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。
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9.发明申请SYSTEMS AND METHODS FOR SELECTING TONES FOR FAR-END CROSS TALK MITIGATION 有权用于选择用于末端十字路口减速的音调的系统和方法公开(公告)号：US20100278328A1
公开(公告)日：2010-11-04
申请号：US12431878
申请日：2009-04-29
IPC分类号： H04B3/32
CPC分类号： H04B3/32
摘要： Systems and methods are described for selecting tones for far-end crosstalk (FEXT) mitigation. In particular, systems and methods are described for performing far-end crosstalk (FEXT) mitigation within a digital subscriber line (xDSL) system. One embodiment is a method that comprises determining a first set of function values relating to a per-tone signal-to-noise ratio (SNR) for a user among a plurality of users for a number of tones, wherein the number of tones is less than or equal to a total number of tones available for transmission. The method further comprises estimating coefficients for performing FEXT mitigation for the number of tones, performing FEXT mitigation on the number of tones based on the estimated coefficients, and performing FEXT mitigation on a selected group of tones from among the number of tones, wherein the selected group of tones is less than or equal to the number tones.
摘要翻译： 描述了用于选择用于远端串扰（FEXT）减轻的音调的系统和方法。 特别地，描述了用于在数字用户线（xDSL）系统内执行远端串扰（FEXT）减轻的系统和方法。 一个实施例是一种方法，其包括确定与多个用户之间的用户对于多个音调的用户的每音调信噪比（SNR）有关的第一功能值集合，其中，音调数量较少 超过或等于可用于传输的总音数。 该方法还包括估计用于对音调数执行FEXT减轻的系数，基于估计的系数对音调数执行FEXT减轻，以及从所选择的音数中对所选择的音调组执行FEXT减轻，其中所选择的 一组音调小于或等于数字音。
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公开(公告)号：US20100061437A1
公开(公告)日：2010-03-11
申请号：US12348565
申请日：2009-01-05
IPC分类号： H04B17/00
CPC分类号： H04B3/46
摘要： Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines (DSL). The characterization of the nature, timing and length of impulse noise sources present on a DSL loop is a critical first step in mitigating the effect of impulse noise on DSL communications. DSL standards provide histograms for impulse length and inter-arrival time of impulses. These histograms can be used to derive the nature, maximum frequency and other statistics related to impulse noise on a DSL line.
摘要翻译： 来自附近或强电场的脉冲噪声可能会扰乱通过数字用户线路（DSL）的通信。 存在于DSL环路上的脉冲噪声源的性质，时间和长度的表征是减轻脉冲噪声对DSL通信的影响的关键的第一步。 DSL标准提供脉冲长度和脉冲到达间隔时间的直方图。 这些直方图可用于导出与DSL线路上的脉冲噪声有关的性质，最大频率和其他统计。
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