-
公开(公告)号：US07023907B1
公开(公告)日：2006-04-04
申请号：US09446357
申请日：1998-06-10
Applicant: 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
Inventor： 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: H04B1/38
CPC classification number: H04M11/062
Abstract: 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.
Abstract translation: 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。
-
公开(公告)号：US06320903B1
公开(公告)日：2001-11-20
申请号：US09147744
申请日：1999-06-07
Applicant: Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenbert , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
Inventor： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Tomas Stefansson , Hans Ohman , Gunnar Bahlenbert , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
IPC: H03H730
CPC classification number: H04L25/03159 , H04L1/0065 , H04L1/0071 , H04L27/2649 , H04L27/2656 , H04L27/2657 , H04L27/2662 , H04L2025/03414 , H04L2025/03522
Abstract: A multi-carrier transmission system using orthogonal carriers with high order QAM constellations for the transmission of a plurality of bits per carrier and symbol. The system uses some method for the determination of an inverse channel model to be used in the equalization process. In the frequency domain, this is normally based on an estimate of the channel attenuation and phase for each carrier. A simplified method of equalization is provided which uses data at the symbol carrier input and output to adaptively estimate an inverse channel model.
Abstract translation: 一种使用具有高阶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的多载波传输系统。 该系统使用一些方法来确定在均衡过程中使用的反向信道模型。 在频域中，这通常基于每个载波的信道衰减和相位的估计。 提供了一种简化的均衡方法，其使用符号载波输入和输出端的数据来自适应地估计反向信道模型。
-
公开(公告)号：US07039020B1
公开(公告)日：2006-05-02
申请号：US09529427
申请日：1998-10-27
Applicant: 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
Inventor： 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: H04J1/00
CPC classification number: H04B3/23
Abstract: 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.
Abstract translation: 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。
-
公开(公告)号：US06181714B2
公开(公告)日：2001-01-30
申请号：US09147749
申请日：1999-06-01
Applicant: Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Thomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
Inventor： Mikael Isaksson , Magnus Johansson , Harry Tonvall , Lennart Olsson , Thomas Stefansson , Hans Ohman , Gunnar Bahlenberg , Anders Isaksson , Goran Okvist , Lis-Marie Ljunggren , Tomas Nordstrom , Lars-Ake Isaksson , Daniel Bengtsson , Siwert Hakansson , Ye Wen
IPC: H04J310
CPC classification number: H04L27/2614 , H04L27/2656 , H04L27/2657 , H04L27/2675
Abstract: A multi-carrier transmission system using DMT. It is known to recover a receiver sample and clock from a reserved carrier, a pilot carrier having a fixed phase. A sampling clock oscillator in a receiver is then phase locked to the pilot carrier. Multi-carrier receivers, such as DMT receivers, are normally equipped with an FFT processor. A complex number representing the pilot carrier is then available from the FFT processor output. If an FFT processor is not available, a one frequency DFT processor can be provided to produce a complex estimate of the pilot carrier. In a DMT system, frame synchronization is handled separately from sampling clock synchronization, although the two processes are intimately related and frame synchronization must be acquired before sampling clock synchronization.
Abstract translation: 使用DMT的多载波传输系统。 已知从保留载波，具有固定相位的导频载波恢复接收机采样和时钟。 然后，接收机中的采样时钟振荡器被相位锁定到导频载波。 多载波接收机（如DMT接收机）通常配有FFT处理器。 然后可以从FFT处理器输出获得表示导频载波的复数。 如果FFT处理器不可用，则可以提供单频DFT处理器以产生导频载波的复杂估计。 在DMT系统中，帧同步与采样时钟同步分开处理，尽管两个过程密切相关，而在采样时钟同步之前必须获取帧同步。
-
公开(公告)号：US06625112B1
公开(公告)日：2003-09-23
申请号：US09147229
申请日：1999-03-11
Applicant: 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
Inventor： 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: H04J1100
CPC classification number: H04L27/2662 , H04L27/2657 , H04L27/2672 , H04L27/2678
Abstract: 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.
Abstract translation: 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。
-
公开(公告)号：US06456649B1
公开(公告)日：2002-09-24
申请号：US09147743
申请日：1999-08-30
Applicant: 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 , Per Odling
Inventor： 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 , Per Odling
IPC: H04B138
CPC classification number: H04L5/0046 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/006
Abstract: A multi-carrier transmission system such as a DMT system. Channel information is transmitted between two transceivers using a plurality of sub-carriers modulated with symbols, each of which represents a multiplicity of bits. Each of the transceivers includes a receiver and a transmitter in which a fixed maximum value was determined for the number of bits for each symbol and in which the system is adapted to determine the bit capacity per symbol of each of the plurality of sub-carriers and to increase the number of bits represented by a symbol transmitted over those sub-carriers having a capacity less than a fixed maximum value to the maximum value by the addition of channel coding bits. The fixed maximum value for the number of bits for each symbol may be determined on the basis of the bit capacity of that one of the sub-carriers having the highest theoretical bit capacity may be at least as large as the theoretical bit capacity.
Abstract translation: 诸如DMT系统的多载波传输系统。 信道信息在两个收发器之间使用多个用符号调制的子载波进行发送，每个子载波表示多个比特。 每个收发机包括接收机和发射机，其中确定每个符号的比特数的固定最大值，并且其中系统适于确定多个子载波中每个的每个符号的比特容量，以及 通过添加信道编码比特来将由具有小于固定最大值的容量的那些子载波发送的符号的比特数增加到最大值。 可以基于具有最高理论比特容量的一个子载波的比特容量可以至少与理论比特容量一样大来确定每个符号的比特数的固定最大值。
-
公开(公告)号：US06366554B1
公开(公告)日：2002-04-02
申请号：US09147759
申请日：1999-06-01
Applicant: 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
Inventor： 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: H04J100
CPC classification number: H04L25/03159 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L5/0048 , H04L5/006 , H04L5/0094 , H04L25/0228 , H04L2025/0349 , H04L2025/037 , H04L2025/03802
Abstract: A multi-carrier transmission system, for example a DMT system. Channel information is transmitted between two transceivers using a plurality of subcarriers. Each subcarrier, or symbol, has a parameter associated with it. The transceivers are adapted to transmit the channel information as a sequence of n groups in which each of the n groups contains information concerning the number of adjacent subcarriers which have the same value as the parameter, together with the actual value of the parameter. The parameter which may have a plurality of discrete values, may be a bit-loading value, or a QAM constellation identifier.
Abstract translation: 多载波传输系统，例如DMT系统。 使用多个子载波在两个收发器之间传送信道信息。 每个子载波或符号具有与其相关联的参数。 所述收发机适于发送所述信道信息作为n组的序列，其中，所述n个组中的每一个与所述参数的实际值一起包含与所述参数具有相同值的相邻子载波的数量的信息。 可以具有多个离散值的参数可以是位加载值或QAM星座标识符。
-
公开(公告)号：US06363128B1
公开(公告)日：2002-03-26
申请号：US09147746
申请日：1999-06-23
Applicant: 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 Håkansson , Ye Wen
Inventor： 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 Håkansson , Ye Wen
IPC: H04L700
CPC classification number: H04L27/2675 , H04L27/2656 , H04L27/2657
Abstract: A multi-carrier transmission system, such as a DMT system. A receiver must be able to recover a sampling clock that is very accurately synchronized to a transmitter sampling clock. Typically, synchronization is achieved by using a reserved carrier, the pilot carrier, which is transmitted with a fixed phase. The receiver sampling clock is then phase locked to the pilot carrier. Frame timing can be recovered by using a correlation technique. Thus an improved method of recovering a sample clock and phase locking the sampling clock to a pilot carrier is provided.
Abstract translation: 多载波传输系统，如DMT系统。 接收机必须能够恢复与发射机采样时钟非常准确同步的采样时钟。 通常，通过使用以固定相传输的保留载波，导频载波来实现同步。 接收机采样时钟然后被锁相到导频载波。 帧定时可以通过使用相关技术来恢复。 因此，提供了一种恢复采样时钟并将采样时钟锁相到导频载波的改进方法。
-
公开(公告)号：US07239687B1
公开(公告)日：2007-07-03
申请号：US09582637
申请日：1999-01-28
Applicant: 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
Inventor： 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 classification number: H04M11/062
Abstract: 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.
Abstract translation: 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。
-
公开(公告)号：US06493395B1
公开(公告)日：2002-12-10
申请号：US09147758
申请日：1999-06-02
Applicant: 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
Inventor： 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: H04L512
CPC classification number: H04L27/2657 , H04L27/2656 , H04L27/2675
Abstract: 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.
Abstract translation: 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。
