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

IPC: H04L25/03 ,  H04L27/26

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。

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

IPC: H04L27/26 ,  H04L5/06

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。

公开(公告)号：WO1996017455A1

公开(公告)日：1996-06-06

申请号：PCT/SE1995001382

申请日：1995-11-21

Applicant: TELIA AB ,  ENGSTRÖM, Bo ,  ISAKSSON, Mikael ,  LARSSON, Roger ,  OLOFSSON, Sven-Rune ,  UNNEBÄCK, Michael ,  ÖQVIST, Göran ,  ÖSTBERG, Christer ,  OLSSON, Lennart

Inventor： TELIA AB

IPC: H04L07/08

CPC classification number: H04L27/2602

Abstract: The present invention relates to a method at mobile radio system for synchronization of transmitter and receiver. The system relates to MC/DS-CDMA-system. In the system information is transmitted digitally in frames. For the purpose a data channel, a pilot channel and a synchronization channel are created. In the data channel the data blocks (D0, D1, D2, etc.) are separated by a guard space DELTA . In the pilot channel, respective the synchronization channel, the information is arranged in blocks which are synchronous with each other. The repeating distance, (A), of the pilot channel, corresponds to the length of one of the data blocks (D0, D1, D2, etc.). The repeating distance for the synchronization channel is S, corresponding to a number of blocks in the data channel. In the synchronization channel information is introduced into the blocks which indicate their relation to the data channel. The method in this way allows an identification of the position of the pilot channel, which indicates the position of the synchronization channel, at which a decoding of the information of the synchronization channel appoints the position of the data channel.

Abstract translation: 本发明涉及用于移动无线电系统的发射机和接收机同步的方法。 该系统涉及MC / DS-CDMA系统。 在系统信息中以数字方式传送信息。 为此，创建数据信道，导频信道和同步信道。 在数据通道中，数据块（D0，D1，D2等）被保护空间DELTA隔开。 在导频信道中，对应于同步信道，信息被排列成彼此同步的块。 导频信道的重复距离（A）对应于一个数据块（D0，D1，D2等）的长度。 同步信道的重复距离为S，对应于数据信道中的块数。 在同步信道中，信息被引入指示它们与数据信道的关系的块中。 以这种方式，该方法允许识别指示同步信道的位置的导频信道的位置，在该位置上同步信道的信息的解码指定数据信道的位置。

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

IPC: H04B10/00 ,  H04J3/06 ,  H04L7/00 ,  H04N1/00 ,  H04L7/08

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。

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

IPC: H04L27/26 ,  H04L5/22

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.