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公开(公告)号：US08817907B2
公开(公告)日：2014-08-26
申请号：US12412191
申请日：2009-03-26
IPC分类号： H04L27/10
CPC分类号： H04L1/0045 , H04L1/1671 , H04L1/243
摘要： The measurement of far-end crosstalk (FEXT) in a Digital Subscriber Line communications is instrumental in the ability of using a multiple input multiple output (MIMO) pre-coder to cancel FEXT. A reliable robust back channel for transmission of error is instrumental to provide error samples for the proper operation of a MIMO pre-coder. Bins can be dedicated to insure bandwidth from the customer premises equipment (CPE) to the central office (CO). By increasing the margin used in the bins, robustness can be added to this back channel between the CPE and CO.
摘要翻译： 数字用户线路通信中远端串扰（FEXT）的测量有助于使用多输入多输出（MIMO）预编码器取消FEXT。 用于错误传输的可靠的鲁棒后置信道对于为MIMO预编码器的正确操作提供错误样本是有用的。 可以专门用于保证客户端设备（CPE）到中心局（CO）的带宽。 通过增加机箱中使用的余量，可以在CPE和CO之间的后向通道中增加鲁棒性。
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2.发明授权Systems and methods for loop termination detection based on per-port calibration 失效基于每端口校准的循环终止检测的系统和方法公开(公告)号：US08515017B2
公开(公告)日：2013-08-20
申请号：US12044531
申请日：2008-03-07
IPC分类号： H04M1/24
摘要： Systems and methods for performing loop termination are described. One embodiment is a method that comprises receiving a per-port calibrated echo signal of a loop under test, receiving a region designation and a loop length for the loop under test, and determining whether the loop is terminated by a short or open termination based on phase of the per-port calibrated echo signal.
摘要翻译： 描述用于执行环路终止的系统和方法。 一个实施例是一种方法，其包括接收被测环路的每端口校准的回波信号，接收被测环路的区域指定和环路长度，以及基于基于 每端口校准回波信号的相位。
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公开(公告)号：US20110058468A1
公开(公告)日：2011-03-10
申请号：US12807524
申请日：2010-09-08
IPC分类号： H04J1/12
CPC分类号： H04M11/062 , H04B3/32 , H04B3/487 , H04M3/304 , H04M3/306 , H04M3/34 , H04M2203/056
摘要： A system for performing a single ended line test (SELT) of a selected subscriber line within a bundle of in-service subscriber lines each supporting frequency division multiplexed multi-tone modulated XDSL communications. The system comprises: a crosstalk cancellation module and a SELT module. The crosstalk cancellation module is coupled to the subscriber lines and configured to cancel crosstalk between the selected subscriber line under test and the in-service subscriber lines. The SELT module couples to the crosstalk cancellation module and is configured to coordinate SELT testing with the crosstalk cancellation module to cancel crosstalk between the selected subscriber line and the in-service subscriber lines during testing.
摘要翻译： 一种用于在支持频分复用多音调调制的XDSL通信的一连串在用用户线路中执行所选用户线路的单端测试（SELT）的系统。 该系统包括：串扰消除模块和SELT模块。 串扰消除模块耦合到用户线路并且被配置为消除所选择的被测试用户线路与在线用户线路之间的串扰。 SELT模块耦合到串扰消除模块，并配置为与串扰消除模块协调SELT测试，以在测试期间消除所选用户线路和在用用户线路之间的串扰。
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4.发明申请SYSTEMS AND METHODS FOR CHARACTERIZING LOOP TERMINATION VIA SINGLE-ENDED LINE TESTING 有权通过单端测试来表征环路终止的系统和方法公开(公告)号：US20100086105A1
公开(公告)日：2010-04-08
申请号：US12325541
申请日：2008-12-01
IPC分类号： H04M1/24
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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5.发明申请Low Complexity Systems and Methods for Peak-to-Average Ratio (PAR) Reduction Using Reserved Tones 有权低复杂度系统和使用保留音调的峰值平均比（PAR）减少的方法公开(公告)号：US20090310704A1
公开(公告)日：2009-12-17
申请号：US12138813
申请日：2008-06-13
IPC分类号： H04L27/00
CPC分类号： H04L27/2618
摘要： Systems and methods for reducing the peak-to-average 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 which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique.
摘要翻译： 用于降低发射机峰值平均比（PAR）的系统和方法可以减少各种模拟组件所需的动态范围。 可以通过应用时域补偿信号来减小PAR，该时域补偿信号在时域补偿信号使用为了减少PAR的目的而被保留的音调的同时减小时域信号中的峰值的幅度。 可以通过改变数字用户线（xDSL）系统中的典型启动过程来实现用于PAR的这些保留音调的预留。 可以使用低复杂度算法或使用自适应技术来实现使用保留的音调来减少PAR。
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6.发明申请公开(公告)号：US20090216489A1
公开(公告)日：2009-08-27
申请号：US12036035
申请日：2008-02-22
CPC分类号： H04L27/2647
摘要： Systems and methods for deriving parameters for frequency domain impulse noise detectors are described. At least one embodiment is a method for deriving a set of parameters associated with a frequency domain impulse noise detector. In accordance with such embodiments, the method comprises setting values for βpivot and βc, wherein βpivot and βc are values associated with a monotonic function of a ratio of a statistical parameter of disruptive noise to a statistical parameter of nominal noise. The method further comprises selecting a fixed ratio (m/M), wherein M is a number of monitored tones, and wherein m is a number of slicer error samples that must exceed a decision threshold for a symbol to be flagged as corrupted. The method also comprises selecting a plurality of values for M and computing a corresponding value of m based on the fixed ratio (m/M), calculating α based on the values of M, m, and βpivot, wherein α is a tunable scaling factor, and calculating a probability of a miss and a probability of a false alarm based on the values of M, m, βc, and α for each of the plurality of values of M. In accordance with some embodiments, the method further comprises selecting from among the plurality of values for M such that the larger of the probability of a miss and the probability of a false alarm is a predetermined scale factor less than a predetermined bit error rate (BER) at a selected value of βc in order to achieve the predetermined BER.
摘要翻译： 描述了用于导出频域脉冲噪声检测器参数的系统和方法。 至少一个实施例是用于导出与频域脉冲噪声检测器相关联的一组参数的方法。 根据这样的实施方案，该方法包括设定betapivot和betac的值，其中betapivot和betac是与破坏性噪声的统计参数与标称噪声的统计参数的比率的单调函数相关联的值。 所述方法还包括选择固定比率（m / M），其中M是所监视音调的数量，并且其中m是必须超过要标记为损坏的符号的判定阈值的限幅器误差样本的数量。 该方法还包括选择M的多个值并基于固定比率（m / M）计算m的对应值，基于M，m和betapivot的值计算α，其中α是可调整缩放因子 ，并且基于M的多个值中的每一个的M，m，betac和α的值来计算遗漏的概率和误报率的概率。根据一些实施例，该方法还包括从 在M的多个值中，使得错误的概率和假警报的概率中的较大者是小于所选择的betac值的预定比特误码率（BER）的预定比例因子，以便实现 预定的BER。
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公开(公告)号：US20090182536A1
公开(公告)日：2009-07-16
申请号：US12178355
申请日：2008-07-23
CPC分类号： H04L1/203
摘要： A dual adaptive importance-sampling system and method is provided that can estimate the probability of events by combining dual complementary importance-sampling simulations. The present invention exploits the ability to determine an optimal biased pdf using an iterative procedure that requires relatively little a priori knowledge of how to bias. Hence, the present invention is particularly suited for evaluating the BERs and/or WERs of coded communication and storage systems, and is generally applicable to arbitrarily chosen codes. When applied to coded communication and storage systems, the present invention provides a versatile technique for the fast and accurate estimation of BERs and WERs of FEC codes down to values of 10−20 or lower.
摘要翻译： 提供了一种双重自适应重要性抽样系统和方法，可以通过组合双重互补重要性抽样模拟来估计事件的概率。 本发明利用了使用迭代过程确定最佳偏差pdf的能力，该迭代过程需要相对较少的如何偏向的先验知识。 因此，本发明特别适用于评估编码的通信和存储系统的BER和/或WER，并且通常适用于任意选择的代码。 当应用于编码通信和存储系统时，本发明提供了一种通用技术，用于将FEC码的BER和WER的快速和准确估计降低到10-20或更低的值。
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8.发明申请公开(公告)号：US20080219413A1
公开(公告)日：2008-09-11
申请号：US12044556
申请日：2008-03-07
IPC分类号： H04M3/22
摘要： Systems and methods for performing loop gauge detection are described. One embodiment is a method that comprises receiving a calibrated per-port echo signal of a loop under test, receiving a loop length estimation for the loop under test, and estimating the loop gauge of the loop under test if the loop is not determined to be a long loop based on a predetermined threshold and if no bridge tap is present on the loop. In accordance with such embodiments, estimating the loop gauge of the loop under test is based on at least one of the following echo signal features: energy of the echo signal in a predetermined frequency band, information on an envelope of maxima for the echo signal, information on an envelope of minima for the echo signal, and a span of ripples on the amplitude of the echo signal.
摘要翻译： 描述了执行环路规检测的系统和方法。 一个实施例是一种方法，其包括接收被测环路的经校准的每端口回波信号，接收被测环路的环路长度估计，以及如果环路未被确定为，则估计所测环路的环路规 基于预定阈值的长循环，以及如果循环上没有桥接抽头。 根据这样的实施例，估计被测环路的回路规格基于以下回波信号特征中的至少一个：预定频带中的回波信号的能量，关于回波信号的最大值的包络的信息， 关于回波信号的最小值的信封的信息，以及回波信号幅度上的波纹跨度。
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公开(公告)号：US20070237214A1
公开(公告)日：2007-10-11
申请号：US11712125
申请日：2007-02-28
IPC分类号： H04B1/38
CPC分类号： H04M11/062
摘要： There is provided a method of shaping PSD (Power Spectrum Density) of an FTTN (Fiber-To-The-Node) downstream signal from a disturber source to achieve spectral compatibility at an FTTN downstream victim with a downstream PSD from a reference source. The method includes receiving the downstream PSD from the reference source. The method further includes receiving an unshaped downstream PSD from the disturber source. The method further includes shaping the PSD of the FTTN downstream signal to have a substantially equivalent FEXT (Far-End Cross-Talk) into the FTTN downstream victim as the downstream PSD from the reference source.
摘要翻译： 提供了一种从干扰源获得FTTN（光纤到节点）下行信号的PSD（功率谱密度）的方法，以在具有来自参考源的下游PSD的FTTN下游受害者处获得频谱兼容性。 该方法包括从参考源接收下游PSD。 该方法还包括从干扰源接收未形成的下游PSD。 该方法还包括对FTTN下行信号的PSD进行整形，以使作为来自参考源的下游PSD的FTTN下游受害者具有基本相等的FEXT（远端交叉对话）。
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公开(公告)号：US20070153838A1
公开(公告)日：2007-07-05
申请号：US11617028
申请日：2006-12-28
申请人： Julien Pons , Amitkumar Mahadevan , Patrick Duvaut
发明人： Julien Pons , Amitkumar Mahadevan , Patrick Duvaut
IPC分类号： H04J3/00
CPC分类号： H03M13/2732 , H03M13/1102 , H03M13/2957 , H03M13/31 , H03M13/6362 , H04L1/0066 , H04L1/0068 , H04L1/0071 , H04L27/2601
摘要： Included are embodiments for subframe interleaving. At least one embodiment of a method includes receiving at least one subframe, the at least one subframe being derived from a plurality of frames of data and interspersing at least a portion of the at least one subframe according to a predetermined subframe interleaving strategy.
摘要翻译： 包括子帧交织的实施例。 方法的至少一个实施例包括接收至少一个子帧，所述至少一个子帧是从多个数据帧导出的，并且根据预定的子帧交错策略散布至少一个子帧的至少一部分。
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