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公开(公告)号：US07023907B1
公开(公告)日：2006-04-04
申请号：US09446357
申请日：1998-06-10
申请人： Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Ohman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Goran Okvist , Lis-Mari Ljunggren , Hans Lungberg , Tomas Stefansson , Gunnar Bahlenberg , Siwert Hakansson , Magnus Johansson
发明人： Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Ohman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Goran Okvist , Lis-Mari Ljunggren , Hans Lungberg , Tomas Stefansson , Gunnar Bahlenberg , Siwert Hakansson , Magnus Johansson
IPC分类号： H04B1/38
CPC分类号： H04M11/062
摘要： A VDSL-modem which is divided into an analog part which is placed in an optical node and a digital part which is placed in a local station. The analog part of the VDSL-modem includes an A/D-converter and D/A-converter, a filter, an amplifier, a hybrid/balun, an adaptive noise attenuator, an optical interface, and possibly an echo canceller. The digital part of the modem includes an FFT/IFFT-processor, a synchronizer, an equalizer, an interleaving unit, an error correction unit, a protocol manager, and an optical interface. The VDSL-modem simplifies synchronization of the modem and reduces power consumption in the optical node. A multiplexor function in the optical node in addition is simpler because it need not manage a protocol.
摘要翻译： VDSL调制解调器，其分为放置在光节点中的模拟部分和放置在本地站中的数字部分。 VDSL调制解调器的模拟部分包括A / D转换器和D / A转换器，滤波器，放大器，混合/平衡 - 不平衡变换器，自适应噪声衰减器，光学接口以及可能的回波消除器。 调制解调器的数字部分包括FFT / IFFT处理器，同步器，均衡器，交错单元，纠错单元，协议管理器和光接口。 VDSL调制解调器简化了调制解调器的同步，并降低了光节点的功耗。 另外，光节点中的复用器功能更简单，因为它不需要管理协议。
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公开(公告)号：US06625112B1
公开(公告)日：2003-09-23
申请号：US09147229
申请日：1999-03-11
申请人： Lennart Olsson , Gunnar Bahlenberg , Daniel Bengtsson , Siwert Hakansson , Anders Isaksson , Lars-Ake Isaksson , Mikael Isaksson , Magnus Johansson , Mauritz Lahti , Lis-Marie Ljunggren , Hans Lundberg , Tomas Nordstrom , Sven-Rune Olofsson , Tomas Stefansson , Hans Ohman , Goran Okvist
发明人： Lennart Olsson , Gunnar Bahlenberg , Daniel Bengtsson , Siwert Hakansson , Anders Isaksson , Lars-Ake Isaksson , Mikael Isaksson , Magnus Johansson , Mauritz Lahti , Lis-Marie Ljunggren , Hans Lundberg , Tomas Nordstrom , Sven-Rune Olofsson , Tomas Stefansson , Hans Ohman , Goran Okvist
IPC分类号： H04J1100
CPC分类号： H04L27/2662 , H04L27/2657 , H04L27/2672 , H04L27/2678
摘要： A mechanism for achieving frame synchronization in the frequency domain. In order to synchronize a receiver with a transmitter, on signal acquisition, the interval in which orthogonality exists is determined. Once this has been achieved, an argument function is calculated from the received frame. This argument function can then be used to improve the synchronization. This system is particularly suitable for use in ADSL and VDSL modems which can be used to give broad band access over copper networks. It is also relevant to broad band transmission in mobile and semi-mobile systems for transmission over radio channels.
摘要翻译： 实现频域帧同步的机制。 为了使接收机与发射机同步，在信号采集中，确定存在正交性的间隔。 一旦达到这个目的，就会从接收的帧中计算一个自变量函数。 这个参数函数可以用来改善同步。 该系统特别适用于ADSL和VDSL调制解调器，可用于通过铜网络实现宽带接入。 它也适用于通过无线电信道进行传输的移动和半移动系统中的宽带传输。
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公开(公告)号：US07239687B1
公开(公告)日：2007-07-03
申请号：US09582637
申请日：1999-01-28
申请人： Sven-Rune Olofsson , Lennart Olsson , Joachim Johansson , Hans Ohman , Mikael Isaksson , Magnus Johansson , Tomas Stefansson , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Daniel Bengtsson
发明人： Sven-Rune Olofsson , Lennart Olsson , Joachim Johansson , Hans Ohman , Mikael Isaksson , Magnus Johansson , Tomas Stefansson , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Daniel Bengtsson
CPC分类号： H04M11/062
摘要： When delivering a broadband service, such as xDSL, without inband POTS, it is necessary to separate the analogue POTS signal and the xDSL signal from each other at both the CO (Central Office) and the CP (Customer's Premises). This can be achieved by using an active POTS splitter. The present invention incorporates test functionality for the line between the CP and the CO, or ONU (Optical Network Unit), in the POTS splitter. This enables two-sided measurements on the line, both during installation and during operation. The measurements are performed at the CO and upon request, or when the test device automatically sends a test message/signal. In this way there is no need for field technicians at the CP side. The POTS splitter can have a unique identity code that is transmitted to the CO each time a test is started, or on receipt of a request from the CO.
摘要翻译： 在提供无带宽POTS等宽带业务（如xDSL）的情况下，有必要在CO（中心局）和CP（客户的场所）上分开模拟POTS信号和xDSL信号。 这可以通过使用活动的POTS分离器来实现。 本发明包括在POTS分离器之间的CP和CO之间的线路的测试功能，或ONU（光网络单元）。 这可以在安装和运行期间在线进行双面测量。 测量在CO和根据请求执行，或当测试设备自动发送测试消息/信号时执行。 这样就不需要在CP方面的现场技术人员。 POTS分离器可以具有唯一的身份码，每当测试开始时，或者在接收到来自CO的请求时，它被传送到CO。
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公开(公告)号：US06738440B1
公开(公告)日：2004-05-18
申请号：US09530947
申请日：2000-12-27
申请人： Mikael Isaksson , Magnus Johansson , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Daniel Bengtsson , Sven-Rune Olofsson , Joachim Johansson , Per Ola Borjesson , Niklas Grip , Richard Nilsson , Frank Sjoberg , Sarah Wilson , Per Odling
发明人： Mikael Isaksson , Magnus Johansson , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Daniel Bengtsson , Sven-Rune Olofsson , Joachim Johansson , Per Ola Borjesson , Niklas Grip , Richard Nilsson , Frank Sjoberg , Sarah Wilson , Per Odling
IPC分类号： H04B1500
CPC分类号： H04L25/10 , H04B1/123 , H04L27/2647
摘要： A RFI canceller, for use in a subscriber line system using multi-carrier modulation, measures a RFI disturbance in carriers falling within a band of frequencies causing the RFI. The RFI ingress into carriers outside the band of frequencies is estimated, and an error correcting signal derived from the estimation of the RFI ingress is subtracted from a received signal. The subscriber line system may be a VDSL system and the multi-carrier modulation may be DMT. The RFI canceller includes a demodulator for demodulating an incoming data stream to provide a first parallel data stream. A parallel to serial convertor converts the first parallel data stream to a first serial data stream. A digital to analogue convertor converts the first serial data stream to a first analogue signal. An analogue RFI canceller circuit combines the analogue signal with an analogue error correcting signal, to produce a second analogue signal. An analogue to digital convertor converts the second analogue signal to a second serial data signal. A serial to parallel convertor converts the second serial data stream to a second parallel data stream. A modulator modulates the second parallel data stream onto a multiplicity of carriers.
摘要翻译： 用于在使用多载波调制的用户线路系统中的RFI消除器测量导致RFI的频率带内的载波中的RFI干扰。 估计RFI进入频带外的载波，并从接收到的信号中减去从估计RFI进入导出的纠错信号。 用户线路系统可以是VDSL系统，并且多载波调制可以是DMT。 RFI消除器包括用于解调输入数据流以提供第一并行数据流的解调器。 并行到串行转换器将第一并行数据流转换为第一串行数据流。 数模转换器将第一串行数据流转换为第一模拟信号。 模拟RFI消除器电路将模拟信号与模拟纠错信号相结合，产生第二个模拟信号。 模数转换器将第二模拟信号转换成第二串行数据信号。 串行到并行转换器将第二串行数据流转换为第二并行数据流。 调制器将第二并行数据流调制到多个载波上。
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公开(公告)号：US07039020B1
公开(公告)日：2006-05-02
申请号：US09529427
申请日：1998-10-27
申请人： Gunnar Bahlenberg , Daniel Bengtsson , Siwert Hakansson , Anders Isaksson , Lars-Ake Isaksson , Mikael Isaksson , Magnus Johansson , Mauritz Lahti , Lis-Marie Ljunggren , Hans Lundberg , Tomas Nordstrom , Lennart Olsson , Sven-Rune Olofsson , Tomas Stefansson , Hans Oman , Goran Okvist , Per Odling , Petra Dentgen , Franck Sjöberg
发明人： Gunnar Bahlenberg , Daniel Bengtsson , Siwert Hakansson , Anders Isaksson , Lars-Ake Isaksson , Mikael Isaksson , Magnus Johansson , Mauritz Lahti , Lis-Marie Ljunggren , Hans Lundberg , Tomas Nordstrom , Lennart Olsson , Sven-Rune Olofsson , Tomas Stefansson , Hans Oman , Goran Okvist , Per Odling , Petra Dentgen , Franck Sjöberg
IPC分类号： H04J1/00
CPC分类号： H04B3/23
摘要： The hybrid circuit can be used to substantially reduce near echo signals. The circuit includes a balanced 2-wire to 4-wire hybrid for interconnecting a two wire receive path and a two wire transmit path to a two wire transmission line. The two wire receive path connects the balanced hybrid to an A/D converter and the two wire transmit path connects a D/A converter to the balanced hybrid. The two wire receive path contains a filter, dimensioned to remove signals transmitted from the D/A converter. The invention is particularly adapted for use with FDD and OFDD.
摘要翻译： 混合电路可以用于大大减少近回波信号。 该电路包括用于将两线接收路径和两线传输路径互连到双线传输线的平衡的2线至4线混合。 两线接收路径将平衡混合器连接到A / D转换器，并且双线传输路径将D / A转换器连接到平衡混合器。 两线接收路径包含滤波器，其尺寸用于去除从D / A转换器发送的信号。 本发明特别适用于FDD和OFDD。
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公开(公告)号：US06731707B1
公开(公告)日：2004-05-04
申请号：US09446120
申请日：2000-08-24
申请人： Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Öhman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Göran Ökvist , Lis-Mari Ljunggren , Hans Lundberg , Tomas Stefansson , Gunnar Bahlenberg , Sivert Håkansson , Magnus Johansson
发明人： Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Öhman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Göran Ökvist , Lis-Mari Ljunggren , Hans Lundberg , Tomas Stefansson , Gunnar Bahlenberg , Sivert Håkansson , Magnus Johansson
IPC分类号： H04L700
CPC分类号： H04N1/0035 , H04J3/0644
摘要： An arrangement for synchronization of nodes in VDSL-systems, or more exactly, synchronization of optical VDSL-nodes which share a common part of a cable in the access network between subscribers and a local station. A time synchronization is provided towards an external system, for instance GPS, which gives a time reference by which the different nodes can be synchronized. The synchronization reduces the near end cross-talk between the VDSL-systems in the different nodes. Preferably, each respective node includes a receiver for a synchronization signal and an internal oscillator with high stability to deliver a stable clock signal.
摘要翻译： 用于VDSL系统中的节点同步的装置，或者更确切地说，在用户和本地站之间共享接入网络中的电缆的公共部分的光VDSL节点的同步。 向外部系统（例如GPS）提供时间同步，其给出不同节点可以被同步的时间参考。 同步减少不同节点中的VDSL系统之间的近端串扰。 优选地，每个相应节点包括用于同步信号的接收器和具有高稳定性以提供稳定时钟信号的内部振荡器。
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公开(公告)号：US06493395B1
公开(公告)日：2002-12-10
申请号：US09147758
申请日：1999-06-02
申请人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
发明人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
IPC分类号： H04L512
CPC分类号： H04L27/2657 , H04L27/2656 , H04L27/2675
摘要： A multi-carrier transmission system using orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol. Such systems place high demands on the synchronization of the receiver with the transmitter. The maximum permitted deviation from exact synchronization is usually a small fraction of a sampling interval. A reserve carrier, the pilot carrier, which is given a fixed phase, is usually used as the reference to achieve this high accuracy. The receiver sampling clock oscillator is phase locked to the pilot carrier. It is therefore necessary to estimate the phase of the pilot carrier. Using a bandpass filter to recover the pilot carrier, regardless of the frame structure of the DMT signal, does not eliminate the influence of neighboring carriers on the pilot carrier.
摘要翻译： 一种使用具有高阶QAM星座的正交载波用于传输每个载波和符号的多个比特的多载波传输系统。 这样的系统对接收机与发射机的同步提出了很高的要求。 精确同步的最大允许偏差通常是采样间隔的一小部分。 通常，作为给定固定相的导频载波的预留载波通常用作参考以实现这种高精度。 接收机采样时钟振荡器与导频载波锁相。 因此，需要估计导频载波的相位。 使用带通滤波器来恢复导频载波，无论DMT信号的帧结构如何，都不会消除相邻载波对导频载波的影响。
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公开(公告)号：US06438174B1
公开(公告)日：2002-08-20
申请号：US09147742
申请日：1999-06-04
申请人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
发明人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
IPC分类号： H04L512
CPC分类号： H04L5/006 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046
摘要： A multi-carrier transmission system such as a DMT based VDSL system. The system uses orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol. This estimate includes digital receiver and transmitter units with the receiver unit including a symbol detection unit. This system is adapted to determine a parameter for each single carrier with the parameter being indicative of a deviation of a received signal from a corresponding constellation point. It compares the parameter with an upper lower limit and if the parameter is outside the limits, changes the constellation used to modulate the carrier to a neighboring constellation. The symbol detection unit may be used to determine a parameter such as the ratio d2/&sgr;2, where d is the shortest distance between neighboring constellations, &sgr; is a standard deviation and &sgr;2 is the variance of the deviations of the input and output signal values of the symbol detection unit.
摘要翻译： 一种多载波传输系统，如基于DMT的VDSL系统。 该系统使用具有高阶QAM星座的正交载波，用于每个载波和符号的多个比特的传输。 该估计包括具有包括符号检测单元的接收器单元的数字接收器和发射器单元。 该系统适于确定每个单载波的参数，其中该参数指示接收到的信号与对应星座点的偏差。 它将参数与上限进行比较，如果参数超出限制，则将用于调制载波的星座更改为相邻星座。 符号检测单元可以用于确定诸如d2 / sigma2之类的参数，其中d是相邻星座之间的最短距离，σ是标准偏差，而sigma2是输入和输出信号值的偏差的方差 符号检测单元。
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公开(公告)号：US06359926B1
公开(公告)日：2002-03-19
申请号：US09147748
申请日：1999-06-01
申请人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
发明人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
IPC分类号： H04L704
CPC分类号： H04L1/0025 , H04L1/0059 , H04L1/0071 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： A two-way multi-carrier transmission system, such as a DMT system. If there are dynamic changes in the transmission parameters, synchronization must be maintained between the transmitter and the receiver when the transmission parameters changed. The first stage of such a process requires that the changes of parameter be notified by one transceiver to others involved in an active communication process over a slow transmission channel such as the control channel. Subsequently, the synchronization transceiver is adjusted simultaneously, i.e., from a predetermined DMT symbol. Such adjustments in time synchronization must be achieved with a minimum of overhead.
摘要翻译： 一种双向多载波传输系统，如DMT系统。 如果传输参数有动态变化，传输参数变化时，必须在发射机和接收机之间保持同步。 这种过程的第一阶段要求将参数的变化通过诸如控制信道的慢速传输信道由一个收发机通知参与有源通信过程中的其他人。 随后，同步收发器被同时调整，即从预定的DMT符号调整。 时间同步中的这种调整必须以最小的开销来实现。
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公开(公告)号：US6160820A
公开(公告)日：2000-12-12
申请号：US147755
申请日：1999-06-14
申请人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
发明人： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
CPC分类号： H04L5/006 , H04L5/0007 , H04L5/0037 , H04L5/0046
摘要： A multi-carrier transmission system, particularly a discrete multi-tone (DMT) system. Data is transmitted between two transceivers using a plurality of carriers. The frequency bandwidth of the system is divided between the plurality of carriers. The transmission system is adapted for operation in a heterogeneous network including a number of subscriber equipments having different channel characteristics and coexisting on the same cable. The length of cable for each subscriber terminal varies in relation to its respective location. The transmission system includes an allocation device for allocating the traffic of subscriber equipments having a shorter length of cable to tones starting from a higher frequency band of the system bandwidth.
摘要翻译： PCT No.PCT / SE97 / 01461 Sec。 371日期1999年6月14日第 102（e）1999年6月14日PCT PCT 1997年9月1日PCT公布。 出版物WO98 / 10556 日期1998年3月12日一种多载波传输系统，特别是离散多音（DMT）系统。 使用多个载波在两个收发器之间传输数据。 系统的频率带宽在多个载波之间划分。 传输系统适用于异构网络中的操作，包括具有不同信道特性的多个用户设备并且在同一电缆上共存。 每个用户终端的电缆长度相对于其各自的位置而变化。 传输系统包括分配装置，用于将具有较短电缆长度的用户设备的业务分配到从系统带宽的较高频带开始的音调。
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