公开(公告)号：US07079549B2

公开(公告)日：2006-07-18

申请号：US10051601

申请日：2002-01-17

申请人： John M. Cioffi ,  John A. C. Bingham ,  Krista S. Jacobsen

发明人： John M. Cioffi ,  John A. C. Bingham ,  Krista S. Jacobsen

IPC分类号： H04J1/02 ,  H04J3/06

CPC分类号： H04L1/0025 ,  H04L1/206 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0048 ,  H04L5/0064 ,  H04L5/0091 ,  H04L5/023 ,  H04L27/2601 ,  H04L27/2608 ,  H04L2001/0093

摘要： A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that include the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

摘要翻译： 公开了使用基于帧的离散多载波传输方案来促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明应用于各种各样的数据传输方案，包括非对称数字用户线路系统，包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。

公开(公告)号：US07027537B1

公开(公告)日：2006-04-11

申请号：US09519727

申请日：2000-03-03

申请人： Kok-Wui Cheong ,  Won-Joon Choi ,  Johnny Li-Shung Fan ,  Zining Wu ,  John M. Cioffi

发明人： Kok-Wui Cheong ,  Won-Joon Choi ,  Johnny Li-Shung Fan ,  Zining Wu ,  John M. Cioffi

IPC分类号： H03D1/06 ,  H03D11/04 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10

CPC分类号： H04L1/005 ,  H04B1/1036 ,  H04L1/0048 ,  H04L1/0057 ,  H04L1/0071 ,  H04L7/0062 ,  H04L25/0202 ,  H04L27/2647 ,  H04L2025/03414

摘要： Methods and mechanisms for reducing the impact of cross talk interference in multi-carrier data transmission systems are disclosed. In one aspect, the invention relates to a method of canceling cross talk interference in a received data signal. The method includes receiving an input signal that includes a primary data signal and a superimposed cross-talk signal. An estimation of the primary data signal and an estimation of the superimposed cross talk signal are iteratively computed. The probable estimation of the primary data signal is based at least in part upon the iteratively computed probable estimation of the cross talk signal and the probable estimation of the superimposed cross talk signal is based at least in part upon the iteratively computed probable estimation of the primary data signal.

摘要翻译： 公开了减少多载波数据传输系统中串扰干扰的影响的方法和机制。 一方面，本发明涉及一种消除接收数据信号中串扰干扰的方法。 该方法包括接收包括主数据信号和叠加的串扰信号的输入信号。 迭代地计算主数据信号的估计和叠加串扰信号的估计。 主要数据信号的可能估计至少部分地基于迭代计算的串扰信号的可能估计，并且叠加串扰信号的可能估计至少部分地基于迭代计算的主要数据信号的可能估计 数据信号。

公开(公告)号：US06990196B2

公开(公告)日：2006-01-24

申请号：US09788267

申请日：2001-02-16

申请人： Chaohuang Zeng ,  Carlos Aldana ,  Atul Salvekar ,  John M. Cioffi

发明人： Chaohuang Zeng ,  Carlos Aldana ,  Atul Salvekar ,  John M. Cioffi

IPC分类号： H04J3/10

CPC分类号： H04B3/487

摘要： Methods, apparatus and systems for identifying crosstalk interference in xDSL systems are disclosed and are useful in a variety of xDSL systems to assist in the provisioning, maintenance and diagnosis of the xDSL system and in spectral management and assignments. Signal data are collected from a receiver, a primary transmitter and any crosstalk transmitters. The signal data are resampled, if necessary. A first estimate of the timing offset between the received signal and each crosstalk signal is then obtained by cross-correlating the received data with the transmitted crosstalk data. The first timing offset estimate is then used in connection with a least-squares estimation of the crosstalk response for the considered crosstalk data and a second estimate of the timing offset. The invention may be used at a third party site remote from the system transmitters and receivers. The crosstalk identification of the present invention can be used in dynamic spectrum management for DSL services and signals.

公开(公告)号：US06937623B2

公开(公告)日：2005-08-30

申请号：US10051593

申请日：2002-01-17

申请人： John M. Cioffi ,  John Bingham ,  Krista S. Jacobsen

发明人： John M. Cioffi ,  John Bingham ,  Krista S. Jacobsen

IPC分类号： H04L1/00 ,  H04L5/02 ,  H04J3/12

CPC分类号： H04L5/1438 ,  H04L7/0008

摘要： A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

摘要翻译： 公开了使用基于帧的离散多载波传输方案促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明可应用于各种各样的数据传输方案，包括非对称数字用户线系统，其包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。

公开(公告)号：US5625651A

公开(公告)日：1997-04-29

申请号：US252829

申请日：1994-06-02

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04L1/00 ,  H04L1/20 ,  H04L5/02 ,  H04L27/26 ,  H04L7/00

CPC分类号： H04L1/0025 ,  H04L1/206 ,  H04L27/2601 ,  H04L27/2608 ,  H04L5/023 ,  H04L1/0003 ,  H04L2001/0093

摘要： A bi-directional data transmission system that facilitates communications between a central unit and a plurality of remote units using a frame based discrete multi-tone (DMT) transmission scheme is disclosed. The discrete multi-tone data transmission system has a multiplicity of discrete subchannels including an overhead bus. In a method aspect of the invention, frames transmitted from the plurality of remote units are synchronized at the central unit. When a selected remote desires to initiate communications, it loop times it own clock to the clock of the central unit and transmits a remote initiated synchronization signal to the central unit over a dedicated overhead subchannel in the overhead bus. The central unit responds with a centrally initiated synchronization signal that contains information indicative of a frame boundary phase shift required to synchronize the selected first remote unit with other remote units that are currently communicating with the central unit. The remote responds by shifting the phase of the frames it outputs by an amount indicated by the centrally initiated synchronization signal. This synchronizes the frame boundaries of the frames outputted by the selected remote unit with frame boundaries of frames output by the other remote units that are currently communicating with the central unit. The synchronization is arranged to occur such that the frame boundaries from the various remotes substantially coincide when they are received at the central unit. Specific central and remote modem designs suitable for implementing such a system are also described.

摘要翻译： 公开了一种使用基于帧的离散多音（DMT）传输方案来促进中央单元和多个远程单元之间的通信的双向数据传输系统。 离散多音调数据传输系统具有包括架空总线的多个离散子信道。 在本发明的方法方面，从多个远程单元发送的帧在中央单元处同步。 当所选择的远程设备希望启动通信时，将其自己的时钟循环到中央单元的时钟，并通过架空总线上的专用开销子信道将远程发起的同步信号发送到中央单元。 中央单元以集中发起的同步信号进行响应，该信号包含指示所选择的第一远程单元与当前与中央单元通信的其他远程单元所需的帧边界相移的信息。 遥控器通过将其输出的帧的相位移动由集中发起的同步信号指示的量来进行响应。 这使由所选择的远程单元输出的帧的帧边界与当前与中央单元通信的其他远程单元输出的帧的帧边界同步。 同步被布置为使得当来自各种遥控器的帧边界在中央单元被接收时基本上重合。 还描述了适于实现这种系统的特定的中央和远程调制解调器设计。

公开(公告)号：US5430661A

公开(公告)日：1995-07-04

申请号：US801815

申请日：1991-12-02

申请人： Kevin D. Fisher ,  William L. Abbott ,  John M. Cioffi ,  Philip S. Bednarz

发明人： Kevin D. Fisher ,  William L. Abbott ,  John M. Cioffi ,  Philip S. Bednarz

IPC分类号： G11B20/10 ,  H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H04B3/04 ,  H04L25/03 ,  G06F17/00

CPC分类号： G11B20/10046 ,  G11B20/10009 ,  H04L25/03057

摘要： Adaptive decision feedback equalizer apparatus for processing information stored on disk or tape media or the like including a data input buffer (34), a gain acquisition circuit (42), a timing acquisition circuit (40) operative to generate timing error signals for controlling the sampling phase of the read signals input to the input buffer, a synchronizing circuit (44) for generating sync detect signals and polarity signals, an FIR filter (36) for generating linear filter output signals, register means (39), feedforward update logic (38) for adjusting the equalizer coefficient signals to develop updated coefficient signals, a dual ported RAM (50) for storing a plurality of the equalizer coefficient signals, feedback logic (48) responsive to the linear filter output signals, equalizer coefficient signals obtained from the RAM, and train data signals, and operative to compute the equalizer error signals and equalizer output signals, feedback update logic (52) for adjusting the values of the coefficient signals for input back to the RAM as update signals, steady-state timing logic (54), and a controller (46) responsive to the polarity signals and the sync detect signals and operative to generate the train data signals and mode control signals for causing the equalizer apparatus to operate in either a set-up/test mode or a run mode, whereby read signals input from a storage media are sampled, amplified and digitally processed to decode stored information bits with the result that, as compared to prior art systems, storage density may be increased and error rate decreased.

摘要翻译： 用于处理存储在磁盘或磁带介质等上的信息的自适应判决反馈均衡器装置，包括数据输入缓冲器（34），增益获取电路（42），定时获取电路（40），用于产生定时误差信号， 输入到输入缓冲器的读取信号的采样相位，用于产生同步检测信号和极性信号的同步电路（44），用于产生线性滤波器输出信号的FIR滤波器（36），寄存器装置（39），前馈更新逻辑 38），用于调整均衡器系数信号以产生更新的系数信号;双端口RAM（50），用于存储多个均衡器系数信号，响应于线性滤波器输出信号的反馈逻辑（48），从 RAM和训练数据信号，并且可操作以计算均衡器误差信号和均衡器输出信号，反馈更新逻辑（52）用于调整 用于作为更新信号输入到RAM的系数信号，稳态定时逻辑（54）和响应于极性信号和同步检测信号的控制器（46），并用于产生列车数据信号和模式控制信号 用于使均衡器装置在设置/测试模式或运行模式下操作，由此从存储介质输入的读取信号被采样，放大和数字处理以解码存储的信息位，结果是与之前的 艺术系统，存储密度可能会增加，错误率降低。

公开(公告)号：US07593458B2

公开(公告)日：2009-09-22

申请号：US11122365

申请日：2005-05-05

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04B1/00 ,  H03K11/00

CPC分类号： H04B3/32

摘要： Operational data is utilized to determine the FEXT interference induced by one line into the other DSL line. FEXT interference can be calculated using the NEXT interference measured between the two lines at the upstream ends of the loops and the downstream channel transfer function of one of the loops. Because the NEXT and transfer function constitute a linear time-invariant system, as does the FEXT interference between the lines, the NEXT interference and line transfer function can be multiplied (if in linear format) or added (if in logarithmic format) to approximate the FEXT interference between the lines. The collection of data, calculations and other functions performed in these techniques may be performed by a system controller, such as a DSL optimizer. An Xlog(u,n) quantity is a decibel-magnitude representation of the insertion-loss equivalent of FEXT transfer functions and is defined as the ratio of (1) a line u's source power into a matched load of 100 Ohms when no binder is present to (2) the power at the output of the subject line when line u is excited with the same source and the binder is present. Xlin(u,n) is the linear equivalent of Xlog(u,n). The Xlog(u,n) and Xlin(u,n) quantities may be represented in specific formats that assist in their use in DSL and other systems. When defined as a line's insertion loss, Xlin (or equivalently Xlog) does not include the effect of any transmit filter.

摘要翻译： 使用操作数据来确定由一条线路引导到另一条DSL线路中的FEXT干扰。 FEXT干扰可以使用在环路上游两条线路之间测量的NEXT干扰以及一个环路的下行信道传递函数来计算。 由于NEXT和传递函数构成线性时不变系统，因此线路之间的FEXT干扰也是如此，NEXT干扰和线传输函数可以乘以（如果是线性格式）或加上（如果以对数格式）近似 线路之间的FEXT干扰。 在这些技术中执行的数据，计算和其他功能的收集可以由诸如DSL优化器之类的系统控制器执行。 Xlog（u，n）量是FEXT传递函数的插入损耗当量的分贝幅度表示，并且被定义为（1）线u的源功率与100欧姆的匹配负载的比率，当没有粘合剂 存在于（2）当线u用相同的源激发并且粘合剂存在时主体线的输出处的功率。 Xlin（u，n）是Xlog（u，n）的线性等价物。 Xlog（u，n）和Xlin（u，n）数量可以以协助其在DSL和其他系统中使用的特定格式来表示。 当定义为线的插入损耗时，Xlin（或等效的Xlog）不包括任何发送过滤器的影响。

公开(公告)号：US20090086800A1

公开(公告)日：2009-04-02

申请号：US12185729

申请日：2008-08-04

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04B1/38

CPC分类号： H04L1/0057 ,  H04B3/32 ,  H04L1/0002 ,  H04L1/0009 ,  H04L1/0019 ,  H04L1/0071 ,  H04L12/2856 ,  H04L12/2874 ,  H04L12/2898 ,  H04L12/6418 ,  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 ,  H04M11/062

摘要： Adaptive FEC coding is used to adjust the codeword composition of FEC codewords in a communication system. A codeword composition ratio may be adjusted in response to variance of a measured transmission error value from a target transmission error value in the system. The codeword composition ratio may be any quantity or value that represents the relation between the payload and parity bytes in the applicable FEC coding scheme. Adjustment of the codeword composition ratio may be adjusting parameters such as the N, K and/or R values in ADSL1 systems or the INP and/or maximum interleaving delay values in ADSL2 systems. A controller may be used to monitor, analyze and adjust the various values used in adaptively managing FEC coding. The present invention may be implemented in a transmission system in which a transmitter transmits data to a receiver via a transmission channel, such as a DSL system.

摘要翻译： 自适应FEC编码用于调整通信系统中FEC码字的码字组成。 可以响应于来自系统中的目标传输误差值的测量的传输误差值的变化来调整码字组成比。 码字组成比可以是表示可应用的FEC编码方案中有效负载和奇偶校验字节之间的关系的任何数量或值。 代码字组成比的调整可以是调整ADSL1系统中的N，K和/或R值或ADSL2系统中的INP和/或最大交织延迟值的参数。 可以使用控制器来监视，分析和调整在自适应地管理FEC编码中使用的各种值。 本发明可以在发射系统中实现，其中发射机经由诸如DSL系统的传输信道向接收机发送数据。

公开(公告)号：US07110370B2

公开(公告)日：2006-09-19

申请号：US10052964

申请日：2002-01-17

申请人： John M. Cioffi ,  John Bingham ,  Krista S. Jacobsen

发明人： John M. Cioffi ,  John Bingham ,  Krista S. Jacobsen

IPC分类号： H04J1/02 ,  H04J3/06 ,  H04Q7/00

CPC分类号： H04L5/1438 ,  H04L7/0008

摘要： A variety of bidirectional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

摘要翻译： 公开了使用基于帧的离散多载波传输方案来促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明可应用于各种各样的数据传输方案，包括非对称数字用户线系统，其包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。

公开(公告)号：US5933454A

公开(公告)日：1999-08-03

申请号：US816839

申请日：1997-03-13

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04L1/00 ,  H04L1/20 ,  H04L5/02 ,  H04L27/26 ,  H04L7/00 ,  H04J1/00

CPC分类号： H04L1/0025 ,  H04L1/206 ,  H04L27/2601 ,  H04L27/2608 ,  H04L5/023 ,  H04L1/0003 ,  H04L2001/0093

摘要： A bi-directional data transmission system that facilitates communications between a central unit and a plurality of remote units using a frame based discrete multi-tone (DMT) transmission scheme is disclosed. The discrete multi-tone data transmission system has a multiplicity of discrete subchannels including an overhead bus. In a method aspect of the invention, frames transmitted from the plurality of remote units are synchronized at the central unit. When a selected remote desires to initiate communications, it loop times it own clock to the clock of the central unit and transmits a remote initiated synchronization signal to the central unit over a dedicated overhead subchannel in the overhead bus. The central unit responds with a centrally initiated synchronization signal that contains information indicative of a frame boundary phase shift required to synchronize the selected first remote unit with other remote units that are currently communicating with the central unit. The remote responds by shifting the phase of the frames it outputs by an amount indicated by the centrally initiated synchronization signal. This synchronizes the frame boundaries of the frames outputted by the selected remote unit with frame boundaries of frames output by the other remote units that are currently communicating with the central unit. The synchronization is arranged to occur such that the frame boundaries from the various remotes substantially coincide when they are received at the central unit. Specific central and remote modem designs suitable for implementing such a system are also described.

摘要翻译： 公开了一种使用基于帧的离散多音（DMT）传输方案来促进中央单元和多个远程单元之间的通信的双向数据传输系统。 离散多音调数据传输系统具有包括架空总线的多个离散子信道。 在本发明的方法方面，从多个远程单元发送的帧在中央单元处同步。 当所选择的远程设备希望启动通信时，将其自己的时钟循环到中央单元的时钟，并通过架空总线上的专用开销子信道将远程发起的同步信号发送到中央单元。 中央单元以集中发起的同步信号进行响应，该信号包含指示所选择的第一远程单元与当前与中央单元通信的其他远程单元所需的帧边界相移的信息。 遥控器通过将其输出的帧的相位移动由集中发起的同步信号指示的量来进行响应。 这使由所选择的远程单元输出的帧的帧边界与当前与中央单元通信的其他远程单元输出的帧的帧边界同步。 同步被布置为使得当来自各种遥控器的帧边界在中央单元被接收时基本上重合。 还描述了适于实现这种系统的特定的中央和远程调制解调器设计。