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11.发明申请
公开(公告)号：WO9810547A3
公开(公告)日：1998-05-07
申请号：PCT/SE9701452
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: H04L27/2675 , H04L27/2656 , H04L27/2657
Abstract: In a multi-carrier 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. The present invention provides an improved method of recovering a sample clock and phase locking the sampling clock to a pilot carrier.
Abstract translation: 在诸如DMT系统的多载波系统中，接收机必须能够恢复非常准确地与发射机采样时钟同步的采样时钟。 典型地，通过使用保留载波（导频载波）来实现同步，该导频载波以固定相位进行传输。 接收器采样时钟然后锁相到导频载波。 帧定时可以通过使用相关技术来恢复。 本发明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。
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公开(公告)号：WO1998010554A2
公开(公告)日：1998-03-12
申请号：PCT/SE1997001459
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: H04L5/006 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046
Abstract: The invention provides a multi-carrier transmission system, for example, a DMT based VDSL system, using orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol, said system including digital receiver and transmitter units, said receiver unit including a symbol detection unit, characterised in that said system is adapted to determining a parameter for each single carrier, said parameter being indicative of a deviation of a received signal from a corresponding constellation point; comparing the parameter with an upper and lower limit; and, if the parameter is outside said limits, changing the constellation used to modulate the carrier to a neighbouring constellation. The symbol detection unit may be used to determine the parameter which may be a ratio d / sigma , where d is the shortest distance between neighbouring constellations, sigma is a standard deviation, and sigma is the variance of the deviations of the input and output signal values of said symbol detection unit.
Abstract translation: 本发明提供一种多载波传输系统，例如基于DMT的VDSL系统，使用具有高阶QAM星座的正交载波，用于每载波和符号传输多个比特，所述系统包括数字接收机和发射机单元，所述接收机单元 包括符号检测单元，其特征在于，所述系统适于确定每个单载波的参数，所述参数表示接收信号与相应星座点的偏差; 将参数与上限和下限进行比较; 并且如果参数在所述极限之外，则将用于将载波调制的星座改变为相邻星座。 符号检测单元可以用于确定可以是比率d 2 / sigma 2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σσ是方差 的所述符号检测单元的输入和输出信号值的偏差。
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公开(公告)号：WO1998010552A2
公开(公告)日：1998-03-12
申请号：PCT/SE1997001457
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: 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.
Abstract translation: 本发明提供一种多载波传输系统，例如DMT系统，其中信道信息在使用多个子载波的两个收发器之间传输，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。
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公开(公告)号：WO1998010547A2
公开(公告)日：1998-03-12
申请号：PCT/SE1997001452
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: H04L27/2675 , H04L27/2656 , H04L27/2657
Abstract: In a multi-carrier 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. The present invention provides an improved method of recovering a sample clock and phase locking the sampling clock to a pilot carrier.
Abstract translation: 在诸如DMT系统的多载波系统中，接收机必须能够恢复与发射机采样时钟非常精确同步的采样时钟。 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。 可以通过使用相关技术来恢复帧定时。 本发明提供一种恢复采样时钟并将采样时钟相位锁定到导频载波的改进方法。
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公开(公告)号：WO9900928A2
公开(公告)日：1999-01-07
申请号：PCT/SE9801115
申请日：1998-06-10
Applicant: TELIA AB , OLOFSSON SVEN RUNE , JOHANSSON JOACHIM , ISAKSSON MIKAEL , OEHMAN HANS , BENGTSSON DANIEL , OLSSON LENNART , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS MARI , LUNDBERG HANS , STEFANSSON TOMAS , BAHLENBERG GUNNAR , HAAKANSSON SIVERT , JOHANSSON MAGNUS
Inventor： OLOFSSON SVEN-RUNE , JOHANSSON JOACHIM , ISAKSSON MIKAEL , OEHMAN HANS , BENGTSSON DANIEL , OLSSON LENNART , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARI , LUNDBERG HANS , STEFANSSON TOMAS , BAHLENBERG GUNNAR , HAAKANSSON SIVERT , JOHANSSON MAGNUS
CPC classification number: H04N1/0035 , H04J3/0644
Abstract: The invention relates to an arrangement for synchronization of nodes in VDSL-systems, or more exactly, synchronization of optical VDSL-nodes (2) which share a common part of a cable in the access network between the subscribers (3) and the local station (1). The invention provides a time synchronization towards an external system (7), 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 respective node includes a receiver (6) for a synchronization signal and an internal oscillator with high stability to deliver a stable clock signal.
Abstract translation: 本发明涉及用于VDSL系统中的节点同步的装置，或更确切地说，在用户（3）和本地站（3）之间共享接入网络中的电缆的公共部分的光VDSL节点（2）的同步 （1）。 本发明提供了朝向外部系统（7）的时间同步，例如GPS，其给出不同节点可以被同步的时间参考。 同步减少了不同节点中的VDSL系统之间的近端串扰。 各个节点最好包括一个用于同步信号的接收器（6）和一个高稳定度的内部振荡器来提供稳定的时钟信号。
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Patent Agency Ranking
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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公开(公告)号：WO9810554A3
公开(公告)日：1998-05-07
申请号：PCT/SE9701459
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 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046
Abstract: The invention provides a multi-carrier transmission system, for example, a DMT based VDSL system, using orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol, said system including digital receiver and transmitter units, said receiver unit including a symbol detection unit, characterised in that said system is adapted to determining a parameter for each single carrier, said parameter being indicative of a deviation of a received signal from a corresponding constellation point; comparing the parameter with an upper and lower limit; and, if the parameter is outside said limits, changing the constellation used to modulate the carrier to a neighbouring constellation. The symbol detection unit may be used to determine the parameter which may be a ratio d?2/σ2¿, where d is the shortest distance between neighbouring constellations, σ is a standard deviation, and σ2 is the variance of the deviations of the input and output signal values of said symbol detection unit.
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19.发明申请
公开(公告)号：WO9810551A3
公开(公告)日：1998-05-07
申请号：PCT/SE9701456
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 , OEDLING PER
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 , OEDLING PER
CPC classification number: H04L5/0046 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/006
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 modulated with symbols, each of which represents a multiplicity of bits, each of said transceivers including a receiver and a transmitter, in which a fixed maximum value is 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 said 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 the fixed maximum value, to said 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 and may be at least as large as said theoretical bit capacity.
Abstract translation: 本发明提供了一种多载波传输系统，例如一种DMT系统，其中使用用符号调制的多个子载波在两个收发信机之间传输信道信息，每个子载波代表多个比特，每个所述收发信机 包括一个接收机和一个发射机，其中为每个符号的比特数确定一个固定的最大值，并且其中该系统适合于确定所述多个子载波中的每一个的每个符号的比特容量，以及 通过增加信道编码比特，将在具有小于固定最大值的容量的那些子载波上发送的由码元表示的比特的数量增加到所述最大值。 每个符号的比特数的固定最大值可以基于具有最高理论比特容量的那个子载波的比特容量来确定，并且可以至少与所述理论比特容量一样大。
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20.发明申请
公开(公告)号：WO1998010553A2
公开(公告)日：1998-03-12
申请号：PCT/SE1997001458
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: H04L5/006 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L27/3461
Abstract: In certain types of transmission system using nQAM it may be desirable to use a control channel superimposed on a nQAM data channel. In such circumstances it is very desirable to be able to separate control channel data from user data without using a higher level protocol layer. For applications 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, i.e. the bit-loading, or constellation identifier are unknown. Binary data is transmitted using nQAM modulation. The binary data comprises 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 said control data is facilitated by arranging control data points to have either unique phase, or unique amplitude, values. These unique values are not employed for user data points.
Abstract translation: 在使用nQAM的某些类型的传输系统中，可能希望使用叠加在nQAM数据信道上的控制信道。 在这种情况下，非常希望能够在不使用较高级协议层的情况下将控制信道数据与用户数据分离。 对于具有可变位加载的多载波系统中的应用，特别希望的是，当n的值，即位加载或星座识别符是未知的时，控制信道数据可以与用户数据分离。 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相位或唯一振幅值，便于分离所述控制数据。 这些唯一值不用于用户数据点。
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