公开(公告)号：US08204211B2

公开(公告)日：2012-06-19

申请号：US12431878

申请日：2009-04-29

Applicant: Amitkumar Mahadevan ,  Patrick Duvaut ,  Laurent Francis Alloin

Inventor： Amitkumar Mahadevan ,  Patrick Duvaut ,  Laurent Francis Alloin

IPC: H04M1/00 ,  H04M9/00 ,  H04M1/76

CPC classification number: H04B3/32

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07953143B2

公开(公告)日：2011-05-31

申请号：US12036035

申请日：2008-02-22

Applicant: Amitkumar Mahadevan ,  Patrick Duvaut ,  Julien D. Pons

Inventor： Amitkumar Mahadevan ,  Patrick Duvaut ,  Julien D. Pons

IPC: H04B1/38 ,  H04K1/10

CPC classification number: H04L27/2647

Abstract: A system is described that comprises a frequency domain impulse noise detector configured to monitor received discrete multi-tone (DMT) symbols for impulse noise, a Reed Solomon (RS) decoder with erasure and erasure correction capability for performing error correction on received DMT symbols, and an optimization module configured to adjust parameters associated with the impulse noise detector, the optimization module configured to adjust values for βpivot, βc, and a ratio (m/M), wherein M is a number of monitored tones, m is a number of slicer error samples that must exceed a decision threshold for a symbol to be flagged as corrupted, and 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.

Abstract translation: 描述了一种系统，其包括被配置为监视用于脉冲噪声的接收的离散多音（DMT）符号的频域脉冲噪声检测器，具有用于对所接收的DMT符号执行纠错的擦除和擦除校正能力的里德所罗门（RS）解码器， 以及优化模块，被配置为调整与所述脉冲噪声检测器相关联的参数，所述优化模块被配置为调整所述第一和第二位置的比值（m / M），其中M是监视音调的数量，m 是多个限幅器错误样本，必须超过要标记为损坏的符号的判定阈值，并且＆bgr; pivot和＆bgr; c是与破坏性噪声的统计参数与统计学的比率的单调函数相关联的值 标称噪声参数

公开(公告)号：US20090310659A1

公开(公告)日：2009-12-17

申请号：US12139146

申请日：2008-06-13

Applicant: Rahul Garg ,  Patrick Duvaut ,  Harish Jethanandani ,  Amitkumar Mahadevan

Inventor： Rahul Garg ,  Patrick Duvaut ,  Harish Jethanandani ,  Amitkumar Mahadevan

IPC: H04B1/38

CPC classification number: H04M11/062

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20090257581A1

公开(公告)日：2009-10-15

申请号：US12100253

申请日：2008-04-09

Applicant: Pravesh Biyani ,  Amitkumar Mahadevan ,  Patrick Duvaut

Inventor： Pravesh Biyani ,  Amitkumar Mahadevan ,  Patrick Duvaut

IPC: H04M1/74

CPC classification number: H04L27/2647 ,  H04B3/32

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20080310296A1

公开(公告)日：2008-12-18

申请号：US12138731

申请日：2008-06-13

Applicant: Amitkumar Mahadevan ,  Patrick Duvaut ,  Harish Jethanandani ,  Rahul Garg

Inventor： Amitkumar Mahadevan ,  Patrick Duvaut ,  Harish Jethanandani ,  Rahul Garg

IPC: H04L29/04 ,  H04B3/00 ,  H04B15/00

CPC classification number: H04L27/2618

Abstract: 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.

Abstract translation: 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。

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：US20070157065A1

公开(公告)日：2007-07-05

申请号：US11615535

申请日：2006-12-22

Applicant: Julien Pons ,  Amitkumar Mahadevan ,  Patrick Duvaut

Inventor： Julien Pons ,  Amitkumar Mahadevan ,  Patrick Duvaut

IPC: H03M13/00 ,  G06F11/00

CPC classification number: H03M13/2732 ,  H03M13/1102 ,  H03M13/2957 ,  H03M13/31 ,  H03M13/6362 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L27/2601

Abstract: Included are embodiments for self protection. At least one embodiment includes Self-protection Unit for protecting a signal that includes a first receiving component configured to receive data, the received data being received as at least one frame and a subframing component configured to subframe at least a portion of the received data, wherein subframing includes converting the at least one into a plurality of subframes. Some embodiments include a subframe interleaver component configured to interleave at least a portion of the subframes.

Abstract translation: 包括自我保护的实施例。 至少一个实施例包括用于保护包括被配置为接收数据的第一接收组件的信号的自保护单元，被接收为至少一个帧的接收数据和被配置为子帧接收到的数据的至少一部分的子帧组件， 其中子帧包括将所述至少一个转换成多个子帧。 一些实施例包括被配置为交织子帧的至少一部分的子帧交织器组件。