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公开(公告)号：WO9929078A2
公开(公告)日：1999-06-10
申请号：PCT/SE9802193
申请日：1998-12-01
Applicant: TELIA AB , NORDSTROEM TOMAS , BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LJUNGGREN LIS MARIE , LUNDBERG HANS , OLOFSSON SVEN RUNE , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , OEKVIST GOERAN
Inventor： NORDSTROEM TOMAS , BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LJUNGGREN LIS-MARIE , LUNDBERG HANS , OLOFSSON SVEN-RUNE , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , OEKVIST GOERAN
CPC classification number: H04L27/2602 , H04L25/03866 , H04L27/2626 , H04L27/2647
Abstract: The present invention simplifies known data scramblers by making use of the synchronisation frames, normally used for measuring channel characteristics, as a source of pseudo-random data which can be combined with incoming user data. The present invention has particular application to multi-carrier transmission systems which employ DMT, or OFDM. Many of these transmission systems send known data, usually referred to as synchronisation frames, to measure channel characteristics such as signal to noise ratio. The known data contained in a synchronisation frame is selected to have a suitable statistical distribution, e.g. pseudo-random. In the data scrambler of the present invention, user data bits are combined with the known synchronisation frame data using an exclusive-OR function. This results in a statistically and computationally efficient scrambling of the user data.
Abstract translation: 本发明通过利用通常用于测量信道特性的同步帧作为可以与输入用户数据组合的伪随机数据源来简化已知数据加扰器。 本发明特别适用于采用DMT或OFDM的多载波传输系统。 这些传输系统中的许多传送已知数据（通常称为同步帧）以测量信道特性，例如信噪比。 包含在同步帧中的已知数据被选择为具有合适的统计分布，例如， 伪随机的。 在本发明的数据扰码器中，使用异或函数将用户数据比特与已知的同步帧数据组合。 这导致用户数据的统计和计算有效的加扰。
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公开(公告)号：WO9810556A2
公开(公告)日：1998-03-12
申请号：PCT/SE9701461
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS MARIE , NORDSTROEM TOMAS , ISAKSSON LARS AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
CPC classification number: H04L5/006 , H04L5/0007 , H04L5/0037 , H04L5/0046
Abstract: The invention relates to a multi-carrier transmission system, particularly a DMT system, in which data is transmitted between two transceivers using a plurality of carriers, the frequency bandwidth of the system being divided between said plurality of carriers, the transmission system being 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 varying in dependence on their respective locations. In accordance with the invention the transmission system includes allocation means for allocating the traffic of subscriber equipments having a shorter length of cable to tones starting from a higher frequency band of said system bandwidth.
Abstract translation: 本发明涉及一种多载波传输系统，特别是DMT系统，其中使用多个载波在两个收发机之间传输数据，该系统的频率带宽在所述多个载波之间划分，该传输系统适于 在包括具有不同信道特性并且在同一电缆上共存的多个用户设备的异构网络中的操作，每个用户终端的电缆长度根据它们各自的位置而变化。 根据本发明，传输系统包括分配装置，用于将具有较短长度的电缆的用户设备的业务分配到从所述系统带宽的较高频带开始的音调。
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公开(公告)号：WO9839872A3
公开(公告)日：2000-08-24
申请号：PCT/SE9800353
申请日：1998-02-27
Applicant: TELIA AB , OLSSON LENNART , BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON LARS AAKE , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LAHTI MAURITZ , LJUNGGREN LIS MARIE , LUNDBERG HANS , NORDSTROEM TOMAS , OLOFSSON SVEN RUNE , STEFANSSON TOMAS , OEMAN HANS , OEKVIST GOERAN
Inventor： OLSSON LENNART , BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON LARS-AAKE , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LAHTI MAURITZ , LJUNGGREN LIS-MARIE , LUNDBERG HANS , NORDSTROEM TOMAS , OLOFSSON SVEN-RUNE , STEFANSSON TOMAS , OEMAN HANS , OEKVIST GOERAN
CPC classification number: H04L27/2662 , H04L27/2657 , H04L27/2672 , H04L27/2678
Abstract: The present invention relates to a receiver for use in an OFDM type transmission system, in which data is transmitted in frames. Each frame has a cyclic prefix which is a repetition of part of the frame. Control means are provided and the control means controls a sampling oscilator. The control means include estimation means for estimating timing deviations of the sampling clock. The estimation means operates entirely on frequency domain input data.
Abstract translation: 本发明涉及一种用于OFDM类型传输系统的接收机，其中数据以帧的形式发送。 每个帧具有循环前缀，其是帧的一部分的重复。 提供控制装置，并且控制装置控制采样振荡器。 控制装置包括用于估计采样时钟的定时偏差的估计装置。 估计装置完全在频域输入数据上运行。
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4.发明申请
公开(公告)号：WO9810548A3
公开(公告)日：1998-06-04
申请号：PCT/SE9701453
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS MARIE , NORDSTROEM TOMAS , ISAKSSON LARS AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
CPC classification number: H04L27/2657 , H04L27/2656 , H04L27/2675
Abstract: Modern multi-carrier transmission systems, using orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol, place high demands on the synchronisation of the receiver with the transmitter. The maximum permitted deviation from exact synchronisation is usually a small fraction of a sampling interval. A reserved 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 neighbouring carriers on the pilot carrier.
Abstract translation: 现代多载波传输系统使用具有高阶QAM星座的正交载波来传输每载波和符号的多个比特，这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。 一个保留的载波，给定一个固定相位的导频载波通常用作参考来实现这个高精度。 接收器采样时钟振荡器被锁相到导频载波。 因此，有必要估计导频载波的相位。 无论DMT信号的帧结构如何，使用带通滤波器来恢复导频载波都不会消除相邻载波对导频载波的影响。
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5.发明申请
公开(公告)号：WO9810546A3
公开(公告)日：1998-06-04
申请号：PCT/SE9701451
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON THOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS MARIE , NORDSTROEM TOMAS , ISAKSSON LARS AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON THOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
CPC classification number: H04L27/2614 , H04L27/2656 , H04L27/2657 , H04L27/2675
Abstract: In multi-carrier transmission systems using, for example, DMT, it is known to recover a receiver sampling 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 a FFT processor. A complex number representing the pilot carrier is then available from the FFT processor output. If a 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 synchronisation is handled separately from sampling clock synchronisation, although the two processes are intimately related and frame synchronisation must be acquired before sampling clock synchronisation.
Abstract translation: 在使用例如DMT的多载波传输系统中，已知从具有固定相位的保留载波，导频载波恢复接收器采样时钟。 接收器中的采样时钟振荡器然后被锁相到导频载波。 多载波接收机，例如DMT接收机，通常配备有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处理器来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是分开处理的，虽然这两个过程密切相关，并且在采样时钟同步之前必须获取帧同步。
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Patent Agency Ranking
公开(公告)号：WO1998010556A3
公开(公告)日：1998-03-12
申请号：PCT/SE1997001461
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON, Mikael , JOHANSSON, Magnus , TONVALL, Harry , OLSSON, Lennart , STEFANSSON, Tomas , ÖHMAN, Hans , BAHLENBERG, Gunnar , ISAKSSON, Anders , ÖKVIST, Göran , LJUNGGREN, Lis-Marie , NORDSTRÖM, Tomas , ISAKSSON, Lars-Åke , BENGTSSON, Daniel , HÅKANSSON, Siwert , WEN, Ye
Inventor： TELIA AB
IPC: H04L05/06
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公开(公告)号：WO1998010555A2
公开(公告)日：1998-03-12
申请号：PCT/SE1997001460
申请日：1997-09-01
Applicant: TELIA AB (publ) , ISAKSSON, Mikael , JOHANSSON, Magnus , TONVALL, Harry , OLSSON, Lennart , STEFANSSON, Tomas , ÖHMAN, Hans , BAHLENBERG, Gunnar , ISAKSSON, Anders , ÖKVIST, Göran , LJUNGGREN, Lis-Marie , NORDSTRÖM, Tomas , ISAKSSON, Lars-Åke , BENGTSSON, Daniel , HÅKANSSON, Siwert , WEN, Ye
Inventor： TELIA AB (publ)
IPC: H04L05/06
CPC classification number: H04L25/03159 , H04L1/0065 , H04L1/0071 , H04L27/2649 , H04L27/2656 , H04L27/2657 , H04L27/2662 , H04L2025/03414 , H04L2025/03522
Abstract: Modern multi-carrier techniques using orthogonal carriers with high order QAM constellations for the transmission of a plurality of bits per carrier and symbol, use some method for the determination of an inverse channel model to be used in an equalisation process. In the frequency domain, this is normally based on an estimate of the channel attenuation and phase for each carrier. The present invention provides a simplified method of equalisation that uses data at the symbol detector input and output to adaptively estimate an inverse channel model.
Abstract translation: 使用具有高阶QAM星座的正交载波以用于每个载波和符号的多个比特的传输的现代多载波技术，使用一些确定在均衡过程中使用的反向信道模型的方法。 在频域中，这通常基于每个载波的信道衰减和相位的估计。 本发明提供一种简化的均衡方法，其使用符号检测器输入和输出端的数据自适应地估计反向信道模型。
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公开(公告)号：WO1998010549A2
公开(公告)日：1998-03-12
申请号：PCT/SE1997001454
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON, Mikael , JOHANSSON, Magnus , TONVALL, Harry , OLSSON, Lennart , STEFANSSON, Tomas , ÖHMAN, Hans , BAHLENBERG, Gunnar , ISAKSSON, Anders , ÖKVIST, Göran , LJUNGGREN, Lis-Marie , NORDSTRÖM, Tomas , ISAKSSON, Lars-Åke , BENGTSSON, Daniel , HÅKANSSON, Siwert , WEN, Ye
Inventor： TELIA AB
IPC: H04L05/06
CPC classification number: H04L1/0025 , H04L1/0059 , H04L1/0071 , H04L27/2657 , H04L27/2662 , H04L27/2675
Abstract: In a two-way multi-carrier transmission system, such as a DMT system, in which there can be dynamic changes in the transmission parameters, some means must be provided for maintaining synchronisation between transmitter and receiver when the transmission parameters change. The first stage of such a process requires that changes of parameter be notified by one transceiver to the other, involved in an active communication process, over a slow transmission channel, the control channel. Subsequently the synchronisation of the transceivers is adjusted simultaneously, i.e. from a predetermined DMT symbol. Such adjustements in time synchronisation must be achieved with a minimum of overhead.
Abstract translation: 在诸如DMT系统的双向多载波传输系统中，其中可以在传输参数中存在动态变化，当传输参数改变时，必须提供一些用于在发射机和接收机之间保持同步的装置。 这种过程的第一阶段要求通过慢速传输信道，控制信道将参数的变化通过一个收发器通知给另一个收发器，参与主动通信过程。 随后，收发器的同步被同时调整，即从预定的DMT符号调整。 时间同步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：WO9839886A3
公开(公告)日：1998-12-10
申请号：PCT/SE9800354
申请日：1998-02-27
Applicant: TELIA AB , OLSSON LENNART , BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON LARS AAKE , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LATHI MAURITZ , LJUNGGREN LIS MARIE , LUNDBERG HANS , NORDSTROEM TOMAS , OLOFSSON SVEN RUNE , STEFANSSON TOMAS , OEHMAN HANS , OEKVIST GOERAN
Inventor： OLSSON LENNART , BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON LARS-AAKE , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LATHI MAURITZ , LJUNGGREN LIS-MARIE , LUNDBERG HANS , NORDSTROEM TOMAS , OLOFSSON SVEN-RUNE , STEFANSSON TOMAS , OEHMAN HANS , OEKVIST GOERAN
CPC classification number: H04L27/2662 , H04L27/2657 , H04L27/2672 , H04L27/2678
Abstract: 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. The present invention provides a mechanism for achieving frame synchronisation, in the frequency domain, by utilising this fact. The first step in synchronising a receiver with a transmitter, on signal acquisition, is to determine the interval in which orthogonality exists. Once this has been achieved an argument function is calculated from the received frame. This argument function can then be used to improve the synchronisation. 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.
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公开(公告)号：WO9810549A3
公开(公告)日：1998-05-22
申请号：PCT/SE9701454
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE
CPC classification number: H04L1/0025 , H04L1/0059 , H04L1/0071 , H04L27/2657 , H04L27/2662 , H04L27/2675
Abstract: In a two-way multi-carrier transmission system, such as a DMT system, in which there can be dynamic changes in the transmission parameters, some means must be provided for maintaining synchronisation between transmitter and receiver when the transmission parameters change. The first stage of such a process requires that changes of parameter be notified by one transceiver to the other, involved in an active communication process, over a slow transmission channel, the control channel. Subsequently the synchronisation of the transceivers is adjusted simultaneously, i.e. from a predetermined DMT symbol. Such adjustements in time synchronisation must be achieved with a minimum of overhead. 00000
Abstract translation: 在诸如DMT系统的双向多载波传输系统中，其中可以在传输参数中存在动态变化，当传输参数改变时，必须提供一些用于在发射机和接收机之间保持同步的装置。 这种过程的第一阶段要求通过慢速传输信道，控制信道将参数的变化通过一个收发器通知给另一个收发器，参与主动通信过程。 随后，收发器的同步被同时调整，即从预定的DMT符号调整。 时间同步的这种调整必须以最小的开销来实现。 00000
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