公开(公告)号：US5623513A

公开(公告)日：1997-04-22

申请号：US165509

申请日：1993-12-13

申请人： Jacky S. Chow ,  John A. C. Bingham ,  Mark B. Flowers ,  John M. Cioffi

发明人： Jacky S. Chow ,  John A. C. Bingham ,  Mark B. Flowers ,  John M. Cioffi

IPC分类号： H04M1/60 ,  H04B3/23 ,  H04B14/04 ,  H04J11/00 ,  H04L27/26 ,  H04Q3/42 ,  H04L5/16 ,  H04B15/00

CPC分类号： H04L27/2647 ,  H04B14/046 ,  H04B3/23 ,  H04L27/2602 ,  H04L27/2623

摘要： A transmission system includes transmit and receive paths coupled via a hybrid circuit to a bidirectional transmission path. The transmit path includes a digital-to-analog converter (DAC) having a given range and precision. The transmit path signal is limited and truncated to this range and precision before the DAC. In one arrangement including an echo canceller coupled between the transmit and receive paths, a difference of the transmit path signal before and after limiting and truncation is used to produce an estimated echo response which is subtracted from the receive path signal. In another arrangement, all of the inputs to the echo canceller are derived from the transmit path after the limiting and truncation. Instead, or in addition, the amplitudes of transmit path signal samples can be shaped in conjunction with the limiting. The system can in particular be an ADSL transmission system using multicarrier modulation. In such a system the amplitudes of transmit path signal samples can be scaled to reduce clipping, with an indication of the scaling being transmitted to a remote receiver.

摘要翻译： 传输系统包括经由混合电路耦合到双向传输路径的发射和接收路径。 发射路径包括具有给定范围和精度的数模转换器（DAC）。 传输路径信号被限制并在DAC之前被截断到这个范围和精度。 在包括耦合在发送和接收路径之间的回波消除器的一种布置中，使用限制和截断之前和之后的发送路径信号的差异来产生从接收路径信号中减去的估计回波响应。 在另一种布置中，回波消除器的所有输入从限制和截断之后的发送路径导出。 替代地，或者另外，传输路径信号样本的幅度可以与限制一起成形。 该系统可以特别地是使用多载波调制的ADSL传输系统。 在这样一个系统中，发送路径信号样本的幅度可以被缩放以减少削波，并且缩放的指示被发送到远程接收机。

公开(公告)号：US5479447A

公开(公告)日：1995-12-26

申请号：US57301

申请日：1993-05-03

申请人： Peter S. Chow ,  John M. Cioffi

发明人： Peter S. Chow ,  John M. Cioffi

IPC分类号： H04B7/005 ,  H04L27/26 ,  H04K1/10 ,  H04L27/28

CPC分类号： H04W52/18 ,  H04L27/2604 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/006

摘要： A method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines wherein the initial optimal transmission bandwidth is identified based on initial signal-to-noise ratio (SNR) estimates of the orthogonal carriers of the multicarrier system. Maximum data throughput, or system performance margin, is achieved by assigning the total amount of information, or number of bits, to be transmitted in each multicarrier symbol to particular carriers through an initial bit allocation procedure, which is possibly subject to variable target bit error rates among the carriers. A transmit power mask, of any shape and level, is imposed upon the system by an initial energy allocation procedure that limits the maximum amount of power to be transmitted in each of the several carriers. Lastly, run-time adaptivity is achieved by monitoring the mean-squared-errors (MSE) of the orthogonal carriers, and the transmission bandwidth, as well as the bit allocation within the multicarrier symbol, is caused to change in real-time corresponding to changes in the channel characteristics in order to maintain optimal system performance.

摘要翻译： 一种用于通过数字用户线路进行多载波信号的自适应，可变带宽，高速数据传输的方法和装置，其中初始最优传输带宽基于信号的正交载波的初始信噪比（SNR）估计来识别 多载波系统 最大数据吞吐量或系统性能裕度是通过将初始位分配过程分配给每个多载波符号中要发送的信息总数或位数，来实现的，该初始位分配过程可能受到可变目标位错误 运营商之间的差距。 任何形状和电平的发射功率掩模通过限制在多个载波中的每一个中发射的最大功率量的初始能量分配过程而施加在系统上。 最后，通过监视正交载波的均方误差（MSE）来实现运行时适应性，并且使得多载波符号中的传输带宽以及比特分配被实时地改变为对应于 改变通道特性，以保持最佳的系统性能。

公开(公告)号：US20120257691A1

公开(公告)日：2012-10-11

申请号：US13527074

申请日：2012-06-19

申请人： Georgios Ginis ,  Wei Yu ,  Chaohuang Zeng ,  John M. Cioffi

发明人： Georgios Ginis ,  Wei Yu ,  Chaohuang Zeng ,  John M. Cioffi

IPC分类号： H04B15/00

CPC分类号： H04B1/1081 ,  H04B1/10 ,  H04B1/1027 ,  H04B3/32 ,  H04B3/46 ,  H04B3/466 ,  H04B3/487 ,  H04B15/00 ,  H04B2001/1045 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0094 ,  H04L7/0016 ,  H04L27/2608 ,  H04M11/062

摘要： Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.

公开(公告)号：US20120051410A1

公开(公告)日：2012-03-01

申请号：US13254454

申请日：2009-03-04

申请人： Mark B. Flowers ,  Mark Mallory ,  Mark Brady ,  John M. Cioffi ,  Mehdi Mohseni

发明人： Mark B. Flowers ,  Mark Mallory ,  Mark Brady ,  John M. Cioffi ,  Mehdi Mohseni

IPC分类号： H04L25/08 ,  H04L5/16 ,  H04B17/00

CPC分类号： H04B3/32 ,  H04B1/7107 ,  H04J11/004 ,  H04L27/2647 ,  H04N7/102

摘要： A method and apparatus in a noise cancellation system that receives a noise reference signal via a noise reference signal input port, and performs at least one of procedures a and b set forth below for reducing noise in a DSL data signal transmitted on a DSL transmission line to which the noise cancellation system is coupled: a.i.) creating a noise free representation of a DSL synchronization symbol repeatedly occurring in the transmitted DSL data signal, and a.ii.) reducing the noise in the transmitted DSL data signal based on the noise free representation of the DSL synchronization symbol and the received noise reference signal, and b.i.) analyzing at least one of the received noise reference signal and the transmitted DSL data signal to identify one or more frequency bands in which to de-emphasize noise cancellation in the transmitted DSL data signal, and b.ii.) causing the noise cancellation system to de-emphasize noise cancellation in the identified one or more frequency bands of the transmitted DSL data signal, responsive to the analysis.

摘要翻译： 一种噪声消除系统中的方法和装置，其经由噪声参考信号输入端口接收噪声参考信号，并执行以下步骤a和b中的至少一个，以减少在DSL传输线路上发送的DSL数据信号中的噪声 噪声消除系统被耦合到其上：ai）创建在所发送的DSL数据信号中重复发生的DSL同步符号的无噪声表示，以及a）基于无噪声来减少发送的DSL数据信号中的噪声 DSL同步符号和接收到的噪声参考信号的表示，以及bi）分析接收到的噪声参考信号和所发送的DSL数据信号中的至少一个，以识别在所发送的DSL数据信号中去除强调噪声消除的一个或多个频带 DSL数据信号和b.ii.），使得噪声消除系统在所识别的一个或多个频带中去强调噪声消除 发送的DSL数据信号，响应于分析。

公开(公告)号：US08064325B1

公开(公告)日：2011-11-22

申请号：US10692297

申请日：2003-10-23

申请人： John M. Cioffi ,  Avneesh Agrawal

发明人： John M. Cioffi ,  Avneesh Agrawal

IPC分类号： H04J11/00

CPC分类号： H04B1/707 ,  H04B2201/70703

摘要： According to example embodiments for use in a communication system that is adapted to permit the users to transmit data simultaneously via shared frequency and spatial resources, an allocation of user transmission rates involves setting and maintaining the transmission rates of the users to at least a minimum user transmission rate to provide an expected minimum quality of communication for each of the users. These rates of the users are incrementally adjusted by iteratively changing the transmission rate of each user as a function of a resulting vector of transmit powers ensuing from the increased transmission rate, a degree of transmission-rate-allocation unfairness relative to the transmission rates of all the users, and a power-based selection criteria. With such an approach, the rates are fairly allocated without a disproportionate allocation of system bandwidth. Various embodiments are applicable to a variety of communication applications including OFDM or CDMA communication systems.

摘要翻译： 根据用于适于允许用户经由共享频率和空间资源同时发送数据的通信系统中的示例实施例，用户传输速率的分配涉及将用户的传输速率设置和维持至少至少最小用户 传输速率以为每个用户提供期望的最小通信质量。 通过根据增加的传输速率的传递功率的结果向量迭代地改变每个用户的传输速率，相对于所有传输速率的传输速率的传输速率分配不公平程度，递增地调整用户的这些速率 用户和基于电源的选择标准。 通过这种方法，速率是公平分配的，而不是不成比例地分配系统带宽。 各种实施例可应用于包括OFDM或CDMA通信系统的各种通信应用。

公开(公告)号：US07852952B2

公开(公告)日：2010-12-14

申请号：US11344873

申请日：2006-02-01

申请人： Wonjong Rhee ,  Iker Almandoz ,  John M. Cioffi ,  Bin Lee ,  Georgios Ginis

发明人： Wonjong Rhee ,  Iker Almandoz ,  John M. Cioffi ,  Bin Lee ,  Georgios Ginis

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L5/0064 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/006

摘要： Loading and ordering techniques are provided for one-sided and two-sided vectored line groups, as well as loading methodologies that also can be used on a single line, in communication systems such as Digital Subscriber Line (DSL) binders. In particular, a method for loading bits into a plurality of lines in a vectored DSL system using Discrete MultiTone (DMT) modulation is disclosed. The method iteratively determines two or more of the following sequentially: line ordering for each tone; power spectral density for the transmitted signal of each line; and bit allocation for the signal of each line. In some embodiments, line ordering may include order-swapping which may assign a first line to a first initial position, assign a second line to a second initial position, move the first line to the second initial position, and move the second line to the first initial position.

摘要翻译： 提供了单向和双向向量线组的加载和排序技术，以及也可以在诸如数字用户线（DSL）绑定器的通信系统中在一条线路上使用的加载方法。 特别地，公开了一种使用离散多音（DMT）调制将位加载到矢量DSL系统中的多行的方法。 该方法迭代地确定以下顺序中的两个或更多个：每个音调的行排序; 每行的发射信号的功率谱密度; 以及每行信号的位分配。 在一些实施例中，线排序可以包括顺序交换，其可以将第一行分配给第一初始位置，将第二行分配给第二初始位置，将第一行移动到第二初始位置，并将第二行移动到 第一个初始位置

公开(公告)号：US07809116B2

公开(公告)日：2010-10-05

申请号：US11069159

申请日：2005-03-01

申请人： Wonjong Rhee ,  Mark Harold Brady ,  John M. Cioffi

发明人： Wonjong Rhee ,  Mark Harold Brady ,  John M. Cioffi

IPC分类号： H04M1/24 ,  H04M3/08 ,  H04M3/22

CPC分类号： H04M3/306 ,  H04B3/48 ,  H04L12/2856 ,  H04L12/2874 ,  H04L41/0853 ,  H04L41/0856 ,  H04L41/12 ,  H04L41/142 ,  H04L43/045 ,  H04L43/08 ,  H04L43/0847 ,  H04L43/0888 ,  H04L43/0894 ,  H04L43/106 ,  H04M3/085 ,  H04M3/2209 ,  H04M3/30 ,  H04M3/304 ,  H04M11/062

摘要： Estimates of a communication system configuration, such as a DSL system, are based on operational data collected from a network element management system, protocol, users and/or the like. The operational data collected from the system can include performance-characterizing operational data that typically is available in an ADSL system via element-management-system protocols. Scanning, wherein a number of line profiles are used in connection with DSL loops having known configurations, can be used to generate a database or library of loop configuration information. One or more of the line profiles can be used with an unknown DSL loop to generate operational data from the unknown DSL loop that is compared to the loop configuration information in the database, allowing identification of loop configuration information pertaining to the unknown DSL loop. The unknown DSL loop operational data also can be used to determine whether one or more bad splices are present on the unknown DSL loop and, in some cases, the approximate or exact bad splice(s) location(s).

摘要翻译： 诸如DSL系统的通信系统配置的估计基于从网元管理系统，协议，用户等收集的操作数据。 从系统收集的操作数据可以包括通过元件管理系统协议在ADSL系统中通常可用的性能特征的操作数据。 扫描，其中与已知配置的DSL环路相关联地使用多个线路简档，可以用于生成环路配置信息的数据库或库。 一个或多个线路配置文件可以与未知DSL环路一起使用，以从未知DSL环路生成与数据库中的环路配置信息进行比较的操作数据，从而允许识别与未知DSL环路有关的环路配置信息。 未知的DSL环路操作数据还可以用于确定未知DSL环路上是否存在一个或多个坏接头，并且在某些情况下，确定是否存在近似或确切的坏接头位置。

公开(公告)号：US20090323903A1

公开(公告)日：2009-12-31

申请号：US12375216

申请日：2007-07-31

申请人： John M. Cioffi ,  Wonjong Rhee ,  George Ginis ,  Sumanth Jagannathan

发明人： John M. Cioffi ,  Wonjong Rhee ,  George Ginis ,  Sumanth Jagannathan

IPC分类号： H04M3/22

CPC分类号： H04L1/20 ,  H04B1/1027 ,  H04B3/32 ,  H04L41/0213 ,  H04L43/0823 ,  H04L43/16 ,  H04M3/2209 ,  H04M3/30

摘要： Data indicative of a level of stability of a DSL link is received. Based on the received data, it is determined whether the data indicates a level of stability of the DSL link that is above or below a minimum threshold. If the level of stability of the DSL link is below the minimum threshold, die noise associated with the DSL link before the time of failure is compared with the noise associated with the DSL link after the time of failure. If the difference between the noise before and after the time of failure exceeds a threshold, then the difference in noise is characterized as a stationary noise associated with the DSL link. However, if the difference between the noise before and after the time of failure is below the threshold, a determination is made whether the failure is associated with a loss of power to the DSL link or a severe impulse noise event—the difference in noise is characterized accordingly. Finally, the characterization of the noise associated with the DSL link is preserved for subsequent possible reconfiguration of the DSL link to improve link stability.

摘要翻译： 接收到指示DSL链路的稳定性水平的数据。 基于接收到的数据，确定数据是否指示高于或低于最小阈值的DSL链路的稳定性水平。 如果DSL链路的稳定级别低于最小阈值，则在故障发生之前与DSL链路相关联的模块噪声与在故障之后与DSL链路相关联的噪声被比较。 如果故障之前和之后的噪声之间的差异超过阈值，则噪声的差异被表征为与DSL链路相关联的稳定的噪声。 然而，如果故障之前和之后的噪声之间的差异低于阈值，则确定故障是否与DSL链路的功率损耗或严重的脉冲噪声事件相关联 - 噪声的差异是 相应地表征。 最后，保留与DSL链路相关联的噪声的表征，以便随后可能重新配置DSL链路以改善链路稳定性。

公开(公告)号：US07639596B2

公开(公告)日：2009-12-29

申请号：US10808771

申请日：2004-03-25

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04J1/12

CPC分类号： H04M11/062 ,  H01L2924/00011 ,  H04B3/32 ,  H04B3/487 ,  H04L1/0002 ,  H04L1/0019 ,  H04L12/2856 ,  H04L12/2859 ,  H04L12/2874 ,  H04L12/2898 ,  H04L12/6418 ,  H04L25/0272 ,  H04L25/0278 ,  H04L27/2601 ,  H04L27/2608 ,  H04L41/0806 ,  H04L41/0853 ,  H04L41/142 ,  H04L43/00 ,  H04L43/0829 ,  H04L43/0847 ,  H04L43/0888 ,  H04L43/0894 ,  H04L43/106 ,  H04L43/16 ,  H04L2012/6478 ,  H04M3/2209 ,  H04M3/30 ,  H04M3/304 ,  H04M3/34 ,  H01L2924/01004

摘要： A DSL system includes a multiple loop segment where K loops are bonded to provide a multiple loop segment having up to (2K−1) communication channels on which transmissions are vectored. The segment may be a drop to a customer premises, an inter-pedestal link, or any other suitable part of a larger DSL system. Generally the bonded loops are relatively short, being 300 meters or less. Signal vectoring is used to increase the speed and data carrying capability of the channels. In some embodiments, an expanded frequency spectrum also can be used to increase the data carrying capability of one or more of the channels. An impedance matching circuit may be coupled to each end of the segment to provided efficient transmission of data across the segment. A controller may provide control signals used to operate the segment as a vectored system and, if desired, frequency bandwidth control signals. The controller may monitor and/or collect data and information from the DSL system to assist in generating control signals. The controller can be a dynamic spectrum manager or DSM Center that includes a computer system and/or other hardware to assist in performing the required functions.

摘要翻译： DSL系统包括多环路段，其中K个环路被绑定以提供具有多达（2K-1）个通信信道的多环路段，在该通道上传输传输。 该段可以是到客户驻地，基座间链路或更大的DSL系统的任何其它适当部分的下降。 通常，粘结环相对短，为300米以下。 信号向量化用于提高通道的速度和数据承载能力。 在一些实施例中，扩展频谱也可以用于增加一个或多个信道的数据承载能力。 阻抗匹配电路可以耦合到段的每个端部，以提供跨越段的数据的有效传输。 控制器可以提供用于操作该段作为向量系统的控制信号，并且如果需要，可提供频率带宽控制信号。 控制器可以监视和/或从DSL系统收集数据和信息以帮助产生控制信号。 控制器可以是动态频谱管理器或DSM中心，其包括计算机系统和/或其他硬件以协助执行所需的功能。

公开(公告)号：US07573943B2

公开(公告)日：2009-08-11

申请号：US10922705

申请日：2004-08-20

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04K1/10

CPC分类号： H04L25/10 ,  H04B1/126 ,  H04B3/32 ,  H04L27/2647 ,  H04M3/304 ,  H04M3/34

摘要： A DSL or other communication system includes a modem or other communication device having at least one antenna that is configured to collect interference data relating to interference noise affecting communication signals being received by the communication device. The interference may include RF interference, such as AM radio interference, crosstalk and other types of interference from various sources. The interference data collected by the antenna is used by an interference canceller to remove and/or cancel some or all of the interference affecting received signals. In some embodiments of the present invention, more than one antenna may be used, wherein each antenna can collect interference data pertaining to a single source of interference noise. Where a modem or other communication device is coupled to multiple telephone lines, only one of which is being used as the active DSL line, wires in the remaining telephone lines or loops can be used as antennas. Moreover, the antenna may be an antenna, per se, such as a compact AM radio antenna or any other suitable structure or device for collecting the type(s) of interference affecting signals received by the communication device.

摘要翻译： DSL或其他通信系统包括具有至少一个天线的调制解调器或其他通信设备，其被配置为收集与影响通信设备正在接收的通信信号的干扰噪声有关的干扰数据。 干扰可能包括RF干扰，如AM无线电干扰，串扰以及其他各种干扰源。 由天线收集的干扰数据由干扰消除器用于去除和/或消除影响接收信号的一些或全部干扰。 在本发明的一些实施例中，可以使用多于一个天线，其中每个天线可以收集属于单个干扰噪声源的干扰数据。 在调制解调器或其他通信设备耦合到多条电话线路的地方，其中只有一条正在用作有源DSL线路，其余电话线路或环路中的线路可用作天线。 此外，天线本身可以是诸如紧凑的AM无线电天线或用于收集影响由通信设备接收的信号的干扰类型的任何其它合适的结构或设备的天线。