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公开(公告)号：JP2000299650A
公开(公告)日：2000-10-24
申请号：JP2000059264
申请日：2000-03-03
Applicant: ST MICROELECTRONICS SA , TELIA AB
Inventor： ISSON OLIVIER , NORDSTROEM TOMAS
Abstract: PROBLEM TO BE SOLVED: To obtain a DSL transmission system of simple constitution by setting a period for processing a filter to an at least previously set time length. SOLUTION: An output symbol system S is subtracted from the output of a delay line 80 by a subtracting circuit 82, and a difference signal is supplied to an FIR filter 84 for realizing a transfer function h* for local echo inference. A filter 84 operates only to sampling data corresponding to a delaying time δor the maximum delaying time of a line and infers echo component from the difference between two continuous symbols. However, being a linear filter, the component is equivalent to the difference between the respective echo components of the two symbols. The output of the filter 84 is supplied for an adding circuit 86, and an input symbol S' receiving the influence of a nonlinear echo is simultaneously received. The circuit 86 supplies a desired orthogonal echo signal to a Fast Fourier Transforming(FFT) circuit 18 as an input signal IN'. Then, the filter 84 operates only in a short period at the starting point of each transmission symbol.
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公开(公告)号：JP2001237747A
公开(公告)日：2001-08-31
申请号：JP2000377457
申请日：2000-12-12
Applicant: ST MICROELECTRONICS SA , ST MICROELECTRONICS NV
Inventor： NORDSTROEM TOMAS , BENGTSSON DANIEL , ISSON OLIVIER
Abstract: PROBLEM TO BE SOLVED: To provide a canceller circuit which can eliminate far-edge crosstalks, in a digital subscriber circuit transmission system. SOLUTION: This system includes a pre-compensation means which multiplies a vector S=(Si), where i is equal to 1 to n by a pre-compensation matrix M prior to transmission, so as to obtain a diagonal matrix product H*M. In this example, H is a transmission matrix of plural transmission channels as prescribed by R=H*S and R=(Ri), where i is equal to 1 to n is a vector of discrete multi-tone symbol Ri that is received by a modem. Such a system configuration is attained by a far-edge crosstalk eliminating circuit.
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公开(公告)号：JP2001244855A
公开(公告)日：2001-09-07
申请号：JP2000377458
申请日：2000-12-12
Applicant: ST MICROELECTRONICS SA , ST MICROELECTRONICS NV
Inventor： NORDSTROEM TOMAS , BENGTSSON DANIEL , ISSON OLIVIER
Abstract: PROBLEM TO BE SOLVED: To provide a canceler circuit which can remove far-end crosstalk in a digital subscriber line transmission system. SOLUTION: Modulated data actually sent by a network terminal model are estimated from the frequency components of a discrete multi-tone symbol received by a line terminal modem to evaluate far-end crosstalk as the linear combination of those estimated values. Far-end crosstalk removing circuits for line terminal models are all provided in a centralized system.
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公开(公告)号：WO9810552A3
公开(公告)日：1998-05-22
申请号：PCT/SE9701457
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: 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: The invention provides a multi-carrier transmission system, for example, a DMT system, in which channel information is transmitted between two transceivers using a plurality of sub-carriers, characterised in that each sub-carrier, or symbol, has a parameter associated therewith, and in that said transceivers are adapted to transmit said channel information as a sequence of n groups, in which each of said n groups contains information concerning the number of adjacent sub-carriers which have the same value as said 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. 00000
Abstract translation: 本发明提供一种多载波传输系统，例如DMT系统，其中使用多个子载波在两个收发机之间传输信道信息，其特征在于每个子载波或符号具有与其相关联的参数 并且所述收发机适于将所述信道信息作为n个组的序列发送，其中所述n个组中的每个组包含与所述参数具有相同值的相邻子载波的数量的信息，以及实际 参数值。 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。 00000
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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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Patent Agency Ranking
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：DE69907864D1
公开(公告)日：2003-06-18
申请号：DE69907864
申请日：1999-03-05
Applicant: ST MICROELECTRONICS NV , ST MICROELECTRONICS SA
Inventor： ISSON OLIVIER , NORDSTROEM TOMAS
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公开(公告)号：DE69906548D1
公开(公告)日：2003-05-08
申请号：DE69906548
申请日：1999-12-14
Applicant: ST MICROELECTRONICS NV , ST MICROELECTRONICS SA
Inventor： NORDSTROEM TOMAS , BENGTSSON DANIEL , ISSON OLIVIER
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公开(公告)号：DE69907864T2
公开(公告)日：2004-05-06
申请号：DE69907864
申请日：1999-03-05
Applicant: ST MICROELECTRONICS NV , ST MICROELECTRONICS SA
Inventor： ISSON OLIVIER , NORDSTROEM TOMAS
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公开(公告)号：DE69906548T2
公开(公告)日：2004-03-04
申请号：DE69906548
申请日：1999-12-14
Applicant: ST MICROELECTRONICS NV , ST MICROELECTRONICS SA
Inventor： NORDSTROEM TOMAS , BENGTSSON DANIEL , ISSON OLIVIER
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