-
公开(公告)号：US5887032A
公开(公告)日：1999-03-23
申请号：US707322
申请日：1996-09-03
申请人： John M. Cioffi
发明人： John M. Cioffi
CPC分类号： H04B3/32 , H04L27/2647
摘要： An apparatus or system for data communications that provides crosstalk cancellation is disclosed. The apparatus or system removes crosstalk interference (e.g., NEXT interference) from received signals on a given line by adaptively estimating the crosstalk interference induced by certain other of the lines having interfering transmissions and by canceling the crosstalk interference using the estimated crosstalk interference from the certain other of the lines. The invention is useful for high speed data transmissions where crosstalk interference can be a substantial impediment to proper reception of data. In particular, the invention is useful for VDSL and ADSL data transmissions using multicarrier modulation (e.g., DMT), wherein transmission frames for all lines are synchronized but the duration of the direction of transmission can vary due to differing frames.
摘要翻译： 公开了一种提供串扰消除的用于数据通信的装置或系统。 该装置或系统通过自适应地估计由具有干扰传输的某些其它线路引起的串扰干扰以及使用来自该特定线路的估计的串扰干扰来消除串扰干扰，来消除给定线路上的接收信号的串扰干扰（例如，NEXT干扰） 其他线路。 本发明对于高速数据传输是有用的，其中串扰干扰可能是正确接收数据的实质障碍。 特别地，本发明对于使用多载波调制（例如，DMT）的VDSL和ADSL数据传输是有用的，其中所有线路的传输帧是同步的，但传输方向的持续时间可以由于不同的帧而变化。
-
公开(公告)号：US5838799A
公开(公告)日：1998-11-17
申请号：US453564
申请日：1995-05-26
IPC分类号： H04B1/16 , H04B1/30 , H04H20/30 , H04H60/73 , H04J1/00 , H04J1/14 , H04J11/00 , H04L5/02 , H04L27/26 , H04H5/00 , H04H1/00
CPC分类号： H04L27/2602 , H04B1/16 , H04B1/30 , H04H20/30 , H04J1/14 , H04L5/023 , H04H2201/183 , H04H60/73
摘要： A method and apparatus for transmitting digital sound is disclosed. The method contemplates transmitting a digital radio signal (such as an FM band signal) over a plurality of sub-channels subject to some constraints on the digital signal power. A control sub-channel, sometimes referred to as an auxiliary overhead channel is used to transmit control information which is interpreted by the receiver to identify the location and potentially the mode of the digital signals.
摘要翻译： 公开了一种用于传输数字声音的方法和装置。 该方法考虑在数字信号功率受到一些约束的情况下在多个子信道上发送数字无线电信号（例如FM频带信号）。 有时称为辅助开销信道的控制子信道用于发送接收机解释的控制信息，以识别数字信号的位置和潜在的模式。
-
83.发明授权
公开(公告)号：US5787113A
公开(公告)日：1998-07-28
申请号：US789154
申请日：1997-01-24
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。
-
84.发明授权Method and apparatus for echo cancellation with discrete multitone modulation 失效用离散多音调制进行回波消除的方法和装置
公开(公告)号：US5317596A
公开(公告)日：1994-05-31
申请号：US984938
申请日：1992-12-01
申请人： Minnie Ho , John M. Cioffi
发明人： Minnie Ho , John M. Cioffi
CPC分类号： H04B3/23 , H04B3/21 , H04L27/2601
摘要： A method of echo cancellation in a full-duplex data communication system with discrete multitone modulation, comprised of an initial step of initializing a set of frequency-domain echo parameters and a set of corresponding time-domain echo parameters, and further including the repeating steps of block multiplying a frequency-domain transmit block of a transmitted signal by the set of frequency-domain echo parameters to produce a frequency-domain echo, converting the frequency-domain transmit block to a time-domain transmit block, subtracting the end of the previous time-domain transmit block from the end of the current time-domain transmit block, performing a convolution of the adjusted time-domain transmit block and the time-domain echo parameters to produce a time-domain echo, subtracting the time-domain echo from a time-domain receive block of a received signal, converting the resulting signal to the frequency-domain to produce a frequency-domain receive block, subtracting the frequency-domain echo from the frequency-domain receive block to produce an echo-free receive block, updating the frequency-domain echo parameters by comparing the echo-free receive block to the frequency-domain transmit block, infrequently updating the time-domain echo parameters by converting the frequency-domain echo parameters to the time-domain, and repeating the repeating steps for each block of the received signal.
摘要翻译： 一种具有离散多音调制的全双工数据通信系统中的回波消除方法，包括初始化一组频域回波参数和一组对应的时域回波参数的初始步骤，还包括重复步骤 通过频域回波参数的集合将发射信号的频域发射块相乘以产生频域回波，将频域发射块转换为时域发射块，减去 从当前时域发射块结束起的前期时域发射块，执行经调整的时域发射块和时域回波参数的卷积以产生时域回波，减去时域回波 从接收到的信号的时域接收块中，将得到的信号转换成频域以产生频域接收块，减去频率 来自频域接收块的熵域回波产生无回波接收块，通过将无回波接收块与频域发射块进行比较来更新频域回波参数，不频繁地更新时域回波 通过将频域回波参数转换为时域，并对接收到的信号的每个块重复重复步骤。
-
85.发明授权公开(公告)号：US09369232B2
公开(公告)日：2016-06-14
申请号：US14399151
申请日：2012-05-07
CPC分类号： H04L1/0015 , H04L1/0009 , H04L1/0017 , H04L1/0026 , H04L1/20 , H04L2001/0093 , H04M3/007 , H04M3/2209
摘要： In accordance with embodiments disclosed herein, there are provided apparatus, systems and methods for impulse noise detection and mitigation. For example, in one embodiment such means include, means for detecting impulse noise; means for classifying the detected impulse noise into one of a plurality of impulse noise classes affecting communications on a Digital Subscriber Line (DSL line); means for selecting a noise mitigation strategy from among a plurality of noise mitigation strategies; means for applying the selected noise mitigation strategy; and means for validating application of the noise mitigation strategy.
摘要翻译： 根据本文公开的实施例，提供了用于脉冲噪声检测和减轻的装置，系统和方法。 例如，在一个实施例中，这种装置包括用于检测脉冲噪声的装置; 用于将检测到的脉冲噪声分类为影响数字用户线路（DSL线路）上的通信的多个脉冲噪声类别之一的装置; 用于从多个噪声缓解策略中选择噪声缓解策略的手段; 用于应用所选择的噪声缓解策略的手段; 以及用于验证噪声缓解策略的应用的手段。
-
公开(公告)号：US08363788B2
公开(公告)日：2013-01-29
申请号：US12517525
申请日：2007-12-07
CPC分类号： H04M3/304 , H04M3/08 , H04M3/2218 , H04M2201/12 , H04M2201/18
摘要： A method of detecting that a condition exists that adversely impacts a digital subscriber line service (DSL) over a telephone line shared by the DSL service and a telephone service. The method includes obtaining information regarding operation of the DSL service over a plurality of different time periods, comparing the information for a first of the plurality of time periods with the information for a second of the plurality of time periods, and determining the condition exists based on the comparison.
摘要翻译： 检测通过DSL服务和电话服务共享的电话线对数字用户线路业务（DSL）产生不利影响的状况的检测方法。 该方法包括：获取关于多个不同时间段中的DSL服务的操作的信息，将多个时间段中的第一时间段的第一个信息与多个时间段中的第二时间段的信息进行比较， 比较。
-
公开(公告)号：US07809996B2
公开(公告)日：2010-10-05
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： G06F11/00
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：US20100142601A1
公开(公告)日：2010-06-10
申请号：US12517525
申请日：2007-12-07
CPC分类号： H04M3/304 , H04M3/08 , H04M3/2218 , H04M2201/12 , H04M2201/18
摘要： A method of detecting that a condition exists that adversely impacts a digital subscriber line service (DSL) over a telephone line shared by the DSL service and a telephone service. The method includes obtaining information regarding operation of the DSL service over a plurality of different time periods, comparing the information for a first of the plurality of time periods with the information for a second of the plurality of time periods, and determining the condition exists based on the comparison.
摘要翻译： 检测通过DSL服务和电话服务共享的电话线对数字用户线路业务（DSL）产生不利影响的状况的检测方法。 该方法包括：获取关于多个不同时间段中的DSL服务的操作的信息，将多个时间段中的第一时间段的第一个信息与多个时间段中的第二时间段的信息进行比较， 比较。
-
公开(公告)号：US07593426B1
公开(公告)日：2009-09-22
申请号：US10842710
申请日：2004-05-10
申请人： Jungwon Lee , John M. Cioffi , Seong Taek Chung
发明人： Jungwon Lee , John M. Cioffi , Seong Taek Chung
CPC分类号： H04L5/0046 , H04L5/006
摘要： Approaches to operating a multi-user, multi-carrier communication system involve allocating a target bit rate across user channels and subchannels to adjust the power. The target bit rate is allocated among subchannels of the user channels as a function of system power associated with the subchannel bit rate allocation. The target bit is allocated among user channels of the communication system as a function of system power associated with the user bit rate allocation. The power allocation for each user channel is determined based on the bit rate allocation.
摘要翻译： 操作多用户多载波通信系统的方法包括在用户信道和子信道之间分配目标比特率以调整功率。 作为与子信道比特率分配相关联的系统功率的函数，在用户信道的子信道之间分配目标比特率。 作为与用户比特率分配相关联的系统功率的函数，在通信系统的用户信道中分配目标比特。 基于比特率分配确定每个用户信道的功率分配。
-
90.发明授权Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system 有权用于在多音调数据传输系统中协调多点到点通信的方法和装置公开(公告)号：US07068678B2
公开(公告)日：2006-06-27
申请号：US10052194
申请日：2002-01-17
IPC分类号： H04L12/403
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 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。
-
-
-
-
-
-
-
-
-
搜索结果
95 条记录 (耗时 0.04 秒)
