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公开(公告)号：US06181714B2
公开(公告)日：2001-01-30
申请号：US09147749
申请日：1999-06-01
申请人： 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
发明人： 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分类号： H04J310
CPC分类号： H04L27/2614 , H04L27/2656 , H04L27/2657 , H04L27/2675
摘要： 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.
摘要翻译： 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。
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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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公开(公告)号：US06456649B1
公开(公告)日：2002-09-24
申请号：US09147743
申请日：1999-08-30
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 , Per Odling
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 , Per Odling
IPC分类号： H04B138
CPC分类号： H04L5/0046 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/006
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US06366554B1
公开(公告)日：2002-04-02
申请号：US09147759
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： H04J100
CPC分类号： H04L25/03159 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L5/0048 , H04L5/006 , H04L5/0094 , H04L25/0228 , H04L2025/0349 , H04L2025/037 , H04L2025/03802
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US06865232B1
公开(公告)日：2005-03-08
申请号：US09147750
申请日：1997-07-15
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： H04L1/0025 , H04L1/0059 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L5/006 , H04L25/03159 , H04L27/2656 , H04L27/2657 , H04L27/2662 , H04L27/3461 , H04L2025/03414 , H04L2025/03522
摘要： A multi-carrier transmission system has a plurality of transceivers, each having a receiver and a transmitter. Data is transmitted between the transceivers by modulating the data onto a multiplicity of carrier waves in the form of multi-bit symbols, wherein each carrier wave constitutes a channel, and wherein the number of bits per symbol (the bit loading), varies between channels and, within a channel, with time, so that each channel has associated therewith a bit loading parameter. In operation, the multi-carrier system is adapted to synchronously update, at the transceivers, the bit loading parameters associated with each channel by transmission of data over a control channel, in that the control channel is established, at system start-up, on a predetermined one of the multiplicity of carrier waves whose identity is known to the transceivers, and in that the control channel is, after start-up, changed from the predetermined channel to a further channel, selected by the first transceiver on the basis of channel characteristics.
摘要翻译： 多载波传输系统具有多个收发机，每个收发机具有接收机和发射机。 通过以多位符号的形式将数据调制到多个载波上，在收发器之间传输数据，其中每个载波构成一个信道，并且其中每个符号的比特数（比特加载）在信道之间变化 并且在频道内，随着时间，使得每个频道与其相关联地加载参数。 在操作中，多载波系统适于在收发机处通过控制信道上的数据传输来同步更新与每个信道相关联的比特加载参数，因为在系统启动时建立控制信道 多个载波的预定的一个载波，其身份对于收发机是已知的，并且控制信道在启动之后从预定信道改变到由第一收发信机基于信道选择的另一个信道 特点
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9.发明授权Data transmission system and method using nQAM constellation with a control channel superimposed on a user data channel 有权使用具有叠加在用户数据信道上的控制信道的nQAM星座的数据传输系统和方法公开(公告)号：US06538986B2
公开(公告)日：2003-03-25
申请号：US09147745
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： H04J1100
CPC分类号： H04L5/006 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L27/3461
摘要： A transmission system using nQAM. A control channel is superimposed on a nQAM data channel. It is desirable to separate control channel data from user data without using a higher level protocol layer. In multi-carrier systems with variable bit-loading it is particularly desirable that the control channel data be separable from user data when the value of n. that is the bit-loading, or constellation identifier are unknown. Binary data is transmitted using nQAM modulation. The binary data includes both user data and control data. This means that a control channel is superimposed on a user data channel within the same nQAM constellation. Separation of the control data is facilitated by arranging control data points to have either a unique phase or unique amplitude values. These unique values are not employed for user data points.
摘要翻译： 使用nQAM的传输系统。 控制信道叠加在nQAM数据信道上。 期望将控制信道数据与用户数据分离，而不使用较高级别的协议层。 在具有可变位加载的多载波系统中，特别希望的是，当n的值时，控制信道数据可以与用户数据分离。 这是位加载，或星座标识符是未知的。 使用nQAM调制传输二进制数据。 二进制数据包括用户数据和控制数据。 这意味着控制信道叠加在相同nQAM星座内的用户数据信道上。 通过将控制数据点布置为具有唯一的相位或唯一的振幅值，便于控制数据的分离。 这些唯一值不用于用户数据点。
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公开(公告)号：US06466629B1
公开(公告)日：2002-10-15
申请号：US09147756
申请日：1999-05-28
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： H03K900
CPC分类号： H04L27/2647
摘要： A multi-carrier transmission system. A received multi-carrier signal is sampled and digitized before FFT processing. Multi-carrier signals consist of many narrow band carrier waves which convey data via a wide band channel. The amplitude distribution of the sum of all the individual carriers is Gaussian. This means that high amplitudes occur with low probability. At the present time, analog to digital converters have a limited dynamic range. It is therefore normal practice to provide a compromise between cutting and quantization noise. The adverse affects of a course quantization have to be balanced between signal distortions caused by the loss of the low probability high amplitude signals.
摘要翻译： 多载波传输系统。 接收的多载波信号在FFT处理之前进行采样和数字化。 多载波信号由许多通过宽带信道传送数据的窄带载波组成。 所有单个载波的和的幅度分布是高斯。 这意味着高幅度以低概率发生。 目前，模数转换器具有有限的动态范围。 因此，通常的做法是在切割和量化噪声之间提供妥协。 课程量化的不利影响必须在由低概率高幅度信号的损失引起的信号失真之间进行平衡。
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