公开(公告)号：US07079610B1

公开(公告)日：2006-07-18

申请号：US09700617

申请日：1999-05-11

申请人： Magnus Johansson ,  Lennart Olsson ,  Gunnar Bahlenberg ,  Daniel Bengtsson ,  Mikael Isaksson ,  Sven-Rune Olofsson ,  Sven-Göran Ökvist

发明人： Magnus Johansson ,  Lennart Olsson ,  Gunnar Bahlenberg ,  Daniel Bengtsson ,  Mikael Isaksson ,  Sven-Rune Olofsson ,  Sven-Göran Ökvist

IPC分类号： H04B1/10

CPC分类号： H04L25/03159 ,  H04L27/2655 ,  H04L2025/03414 ,  H04L2025/03522 ,  H04L2025/03617

摘要： In a multi-carrier system employing OFDM, for example DMT, an adaptive channel equalizer is normally used, operating in the frequency domain. The sampling clock is controlled so that the time delay between the transmitter and the receiver is effectively eliminated. If the information used to control the sampling clock is received from the equalized data stream, it will introduce an ambiguity between the operation of the channel equalizer and the mechanism used to control the sampling clock. Operation of the equalizer can mask an increasing time difference, between transmitter and receiver, which the sample clock controller should be tracking. The present invention eliminates the ambiguities in the operation of the equalizer and sample clock controller by preventing the equalizer from accepting time differences which should be corrected by operation of the sample clock controller.

摘要翻译： 在采用OFDM的多载波系统中，例如DMT，通常使用自适应信道均衡器，在频域中工作。 控制采样时钟，以便有效地消除发射机和接收机之间的时间延迟。 如果从均衡数据流接收到用于控制采样时钟的信息，则会在通道均衡器的操作和用于控制采样时钟的机制之间引入歧义。 均衡器的操作可以掩盖采样时钟控制器应该跟踪的发射机和接收机之间的增加的时间差。 本发明通过防止均衡器接受应该通过采样时钟控制器的操作来校正的时间差来消除均衡器和采样时钟控制器的操作中的模糊性。

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。

公开(公告)号：US06606047B1

公开(公告)日：2003-08-12

申请号：US09700888

申请日：2000-11-20

申请人： Per Ola Börjesson ,  Mikael Isaksson ,  Per Ödling ,  Daniel Bengtsson ,  Gunnar Bahlenberg ,  Magnus Johansson ,  Lennart Olsson ,  Sven Göran Ökvist

发明人： Per Ola Börjesson ,  Mikael Isaksson ,  Per Ödling ,  Daniel Bengtsson ,  Gunnar Bahlenberg ,  Magnus Johansson ,  Lennart Olsson ,  Sven Göran Ökvist

IPC分类号： H03M112

CPC分类号： H03M1/12

摘要： A circuit, for digitizing an analogue signal includes an analogue to digital converter, a clip processor adapted to estimate a value for clipped digital signal samples, and a buffer adapted to dynamically store a plurality of digitized samples produced by the analogue to digital converter. The clip processor is adapted to read digitized samples from the buffer and replace clipped digitized samples with the estimated values, thereby mitigating the effects of clipping in an output of the circuit.

摘要翻译： 用于数字化模拟信号的电路包括模数转换器，适于估计经裁剪的数字信号样本的值的剪辑处理器，以及适于动态地存储由模数转换器产生的多个数字化采样的缓冲器。 剪辑处理器适于从缓冲器读取数字化样本，并用估计值替换剪切的数字化样本，从而减轻限幅在电路输出中的影响。

公开(公告)号：US07050489B1

公开(公告)日：2006-05-23

申请号：US09856438

申请日：1999-11-18

申请人： Frank Sjöberg ,  Sarah Kate Wilson ,  Rickard Nilsson ,  Daniel Bengtsson ,  Mikael Isaksson ,  Tomas Nordström ,  Per Ödling ,  Gunnar Bahlenberg ,  Magnus Johansson ,  Lennart Olsson ,  Sven-Göran Ökvist

发明人： Frank Sjöberg ,  Sarah Kate Wilson ,  Rickard Nilsson ,  Daniel Bengtsson ,  Mikael Isaksson ,  Tomas Nordström ,  Per Ödling ,  Gunnar Bahlenberg ,  Magnus Johansson ,  Lennart Olsson ,  Sven-Göran Ökvist

IPC分类号： H04B1/38

CPC分类号： H04B3/32 ,  H04L5/0007

摘要： One problem, frequently encountered with VDSL transmission systems, is that upstream FEXT produced by system users having short wires can be very strong. Users having shorter wires get high bit rates whereas users having longer wires get low bit rates. In extreme cases it may happen that users with wire lengths greater than 1000 meter cannot transmit data upstream. The present invention provides a VDST transmission system with a plurality of modems. The modems are located at varying distances from a central station. There is a target bit rate for each modem. That modems on shorter wires have control means for reducing their transmit power. This reduces the FEXT produced by these modems enabling modems on longer wires to transmit at higher bit rates.

摘要翻译： VDSL传输系统经常遇到的一个问题是系统用户短路导致的上游FEXT可能非常强大。 具有较短导线的用户获得高比特率，而具有较长导线的用户可获得较低的比特率。 在极端情况下，线长大于1000米的用户无法向上传输数据。 本发明提供一种具有多个调制解调器的VDST传输系统。 调制解调器位于距离中心站不同的距离。 每个调制解调器有一个目标比特率。 较短导线上的调制解调器具有降低发射功率的控制装置。 这减少了由这些调制解调器产生的FEXT，使得更长导线上的调制解调器能够以更高的比特率传输。

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。

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

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

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。

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。

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。

公开(公告)号：US20060209976A1

公开(公告)日：2006-09-21

申请号：US11436014

申请日：2006-05-17

申请人： Magnus Johansson ,  Lennart Olsson ,  Gunnar Bahlenberg ,  Daniel Bengtsson ,  Mikael Isaksson ,  Sven-Rune Olofsson ,  Sven Okvist

发明人： Magnus Johansson ,  Lennart Olsson ,  Gunnar Bahlenberg ,  Daniel Bengtsson ,  Mikael Isaksson ,  Sven-Rune Olofsson ,  Sven Okvist

IPC分类号： H04K1/10 ,  H04B1/10

CPC分类号： H04L25/03159 ,  H04L27/2655 ,  H04L2025/03414 ,  H04L2025/03522 ,  H04L2025/03617

摘要： In a multi-carrier system employing OFDM, for example DMT, an adaptive channel equalizer is normally used, operating in the frequency domain. The sampling clock is controlled so that the time delay between the transmitter and the receiver is effectively eliminated. If the information used to control the sampling clock is received from the equalized data stream, it will introduce an ambiguity between the operation of the channel equalizer and the mechanism used to control the sampling clock. Operation of the equalizer can mask an increasing time difference, between transmitter and receiver, which the sample clock controller should be tracking. The present invention eliminates the ambiguities in the operation of the equalizer and sample clock controller by preventing the equalizer accepting time differences which should be corrected by operation of the sample clock controller.

公开(公告)号：US06751261B1

公开(公告)日：2004-06-15

申请号：US09147230

申请日：1999-02-09

申请人： Lennart Olsson ,  Gunnar Bahlenberg ,  Daniel Bengtsson ,  Siwert Håkansson ,  Anders Isaksson ,  Lars-Ake Isaksson ,  Mikael Isaksson ,  Magnus Johansson ,  Mauritz Lahti ,  Lis-Marie Ljunggren ,  Hans Lundberg ,  Tomas Nordstrom ,  Sven-Rune Olofsson ,  Tomas Stefansson ,  Hans Oman ,  Goran Okvist

发明人： Lennart Olsson ,  Gunnar Bahlenberg ,  Daniel Bengtsson ,  Siwert Håkansson ,  Anders Isaksson ,  Lars-Ake Isaksson ,  Mikael Isaksson ,  Magnus Johansson ,  Mauritz Lahti ,  Lis-Marie Ljunggren ,  Hans Lundberg ,  Tomas Nordstrom ,  Sven-Rune Olofsson ,  Tomas Stefansson ,  Hans Oman ,  Goran Okvist

IPC分类号： H04L506

CPC分类号： H04L27/2662 ,  H04L27/2657 ,  H04L27/2672 ,  H04L27/2678

摘要： With OFDM systems the frequency domain data is the Fourier transform of the received time domain OFDM frames. The time domain frames must be sampled, at the receiver, in synchronism with the transmitter, so that each received frame contains data from only a single transmitted frame. It is vital for this synchronism to be maintained in order to maintain the orthogonality of the frames. A typical multi-carrier system, of the OFDM type, which uses a cyclic prefix permits orthogonality to be maintained when there is a small deviation from exact frame synchronisation. Because the signalling interval includes both an entire frame and the cyclic prefix, which is a repetition of part of the frame, a frame sampled within the signalling interval will contain data from only one frame. Since the signalling interval is greater than the frame period, this gives some leeway in frame alignment. In a multi-carrier system of the OFDM type, an adaptive channel equalizer, operating in the frequency domain, is often used. The internal parameters in such an equalizer contain, in addition to information about the characteristics of the channel, information which can be interpreted as the time deviation between the sampling clocks of the transmitter and the receiver. The present invention utilizes this information to control the sampling clock of the receiver in a more robust way than has previously been possible with known techniques. The present invention is particularly suitable for use in ADSL and VDSL modems which can be used to give broadband access over copper networks. The invention is also of relevance to broadband transmission in mobile and semi-mobile systems for transmission over the radio channels.

摘要翻译： 对于OFDM系统，频域数据是接收的时域OFDM帧的傅里叶变换。 必须在接收机处与发射机同步地采样时域帧，使得每个接收的帧包含来自仅一个发射帧的数据。 为了保持帧的正交性，保持该同步是至关重要的。 使用循环前缀的OFDM类型的典型多载波系统当与精确帧同步的偏差很小时，允许维持正交性。 由于信令间隔包括作为帧的一部分的重复的整个帧和循环前缀，所以在信令间隔内采样的帧将仅包含来自一个帧的数据。 由于信令间隔大于帧周期，所以在帧对齐中给出了一些余地。 在OFDM类型的多载波系统中，经常使用在频域中工作的自适应信道均衡器。 除了关于信道特性的信息之外，这种均衡器中的内部参数还包含可被解释为发射机和接收机的采样时钟之间的时间偏差的信息。 本发明利用该信息以比先前已知技术可能的更可靠的方式来控制接收机的采样时钟。 本发明特别适用于ADSL和VDSL调制解调器，可用于通过铜网络提供宽带接入。 本发明还涉及用于在无线电信道上传输的移动和半移动系统中的宽带传输。