专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明授权

US07079610B1 Telecommunications transmission systems 有权
标题翻译：电信传输系统
公开(公告)号：US07079610B1
公开(公告)日：2006-07-18
申请号：US09700617
申请日：1999-05-11
申请人： Magnus Johansson , Lennart Olsson , Gunnar Bahlenberg , Daniel Bengtsson , Mikael Isaksson , Sven-Rune Olofsson , Sven-Göran Ökvist
发明人： Magnus Johansson , Lennart Olsson , Gunnar Bahlenberg , Daniel Bengtsson , Mikael Isaksson , Sven-Rune Olofsson , Sven-Göran Ökvist
IPC分类号： H04B1/10
CPC分类号： H04L25/03159 , H04L27/2655 , H04L2025/03414 , H04L2025/03522 , H04L2025/03617
摘要： In a multi-carrier system employing OFDM, for example DMT, an adaptive channel equalizer is normally used, operating in the frequency domain. The sampling clock is controlled so that the time delay between the transmitter and the receiver is effectively eliminated. If the information used to control the sampling clock is received from the equalized data stream, it will introduce an ambiguity between the operation of the channel equalizer and the mechanism used to control the sampling clock. Operation of the equalizer can mask an increasing time difference, between transmitter and receiver, which the sample clock controller should be tracking. The present invention eliminates the ambiguities in the operation of the equalizer and sample clock controller by preventing the equalizer from accepting time differences which should be corrected by operation of the sample clock controller.
摘要翻译：在采用OFDM的多载波系统中，例如DMT，通常使用自适应信道均衡器，在频域中工作。控制采样时钟，以便有效地消除发射机和接收机之间的时间延迟。如果从均衡数据流接收到用于控制采样时钟的信息，则会在通道均衡器的操作和用于控制采样时钟的机制之间引入歧义。均衡器的操作可以掩盖采样时钟控制器应该跟踪的发射机和接收机之间的增加的时间差。本发明通过防止均衡器接受应该通过采样时钟控制器的操作来校正的时间差来消除均衡器和采样时钟控制器的操作中的模糊性。

22. 发明授权

US07113549B1 In, or relating to, VDSL 有权
标题翻译：在或与VDSL有关
公开(公告)号：US07113549B1
公开(公告)日：2006-09-26
申请号：US09622523
申请日：1999-02-17
申请人： Mikael Isaksson , Daniel Bengtsson , Frank Sjöberg , Per Ödling , Rickard Nilsson , Gunnar Bahlenberg , Magnus Johansson , Lennart Olsson , Göran Ökvist
发明人： Mikael Isaksson , Daniel Bengtsson , Frank Sjöberg , Per Ödling , Rickard Nilsson , Gunnar Bahlenberg , Magnus Johansson , Lennart Olsson , Göran Ökvist
IPC分类号： H04B15/00
CPC分类号： H04L5/143 , H04L27/2607 , H04L27/2626 , H04L27/2647
摘要： Zipper is the time-synchronized frequency-division duplex implementation of discrete multi-tome (DMT) modulation. Two communicating Zipper modems transmit DMT symbols simultaneously with a common clock. When all transmitters are time synchronized, the near end cross-talk (NEXT) and near end echoes injected into the received signal are orthogonal to the desired signal. The present invention provides a telecommunications transmission system using zipper and having at least two VDSL systems. Each VDSL system comprises a pair of zipper modems communicating over a cable transmission path. The telecommunications transmission system handles zipper transmission transmitted over the common cable; at least partly mitigates NEXT; and permits transmissions in a first VDSL system which are asynchronous with transmissions in a second VDSL system.
摘要翻译：拉链是离散多包（DMT）调制的时间同步分频双工实现。两个通信的拉链调制解调器同时发送DMT符号与公共时钟。当所有发射机都是时间同步时，注入接收信号的近端串扰（NEXT）和近端串扰回波正交于所需信号。本发明提供一种使用拉链并具有至少两个VDSL系统的电信传输系统。每个VDSL系统包括通过电缆传输路径通信的一对拉链调制解调器。电信传输系统处理通过公共电缆传输的拉链传输; 至少部分减轻NEXT; 并允许与第二VDSL系统中的传输异步的第一VDSL系统中的传输。

23. 发明授权

US07050489B1 VDSL transmission systems 有权
标题翻译： VDSL传输系统
公开(公告)号：US07050489B1
公开(公告)日：2006-05-23
申请号：US09856438
申请日：1999-11-18
申请人： Frank Sjöberg , Sarah Kate Wilson , Rickard Nilsson , Daniel Bengtsson , Mikael Isaksson , Tomas Nordström , Per Ödling , Gunnar Bahlenberg , Magnus Johansson , Lennart Olsson , Sven-Göran Ökvist
发明人： Frank Sjöberg , Sarah Kate Wilson , Rickard Nilsson , Daniel Bengtsson , Mikael Isaksson , Tomas Nordström , Per Ödling , Gunnar Bahlenberg , Magnus Johansson , Lennart Olsson , Sven-Göran Ökvist
IPC分类号： H04B1/38
CPC分类号： H04B3/32 , H04L5/0007
摘要： One problem, frequently encountered with VDSL transmission systems, is that upstream FEXT produced by system users having short wires can be very strong. Users having shorter wires get high bit rates whereas users having longer wires get low bit rates. In extreme cases it may happen that users with wire lengths greater than 1000 meter cannot transmit data upstream. The present invention provides a VDST transmission system with a plurality of modems. The modems are located at varying distances from a central station. There is a target bit rate for each modem. That modems on shorter wires have control means for reducing their transmit power. This reduces the FEXT produced by these modems enabling modems on longer wires to transmit at higher bit rates.
摘要翻译： VDSL传输系统经常遇到的一个问题是系统用户短路导致的上游FEXT可能非常强大。具有较短导线的用户获得高比特率，而具有较长导线的用户可获得较低的比特率。在极端情况下，线长大于1000米的用户无法向上传输数据。本发明提供一种具有多个调制解调器的VDST传输系统。调制解调器位于距离中心站不同的距离。每个调制解调器有一个目标比特率。较短导线上的调制解调器具有降低发射功率的控制装置。这减少了由这些调制解调器产生的FEXT，使得更长导线上的调制解调器能够以更高的比特率传输。

24. 发明授权

US06606047B1 Methods and apparatus for estimating clipped samples during analog to digital conversion 有权
标题翻译：用于在模数转换期间估计限幅样本的方法和装置
公开(公告)号：US06606047B1
公开(公告)日：2003-08-12
申请号：US09700888
申请日：2000-11-20
申请人： Per Ola Börjesson , Mikael Isaksson , Per Ödling , Daniel Bengtsson , Gunnar Bahlenberg , Magnus Johansson , Lennart Olsson , Sven Göran Ökvist
发明人： Per Ola Börjesson , Mikael Isaksson , Per Ödling , Daniel Bengtsson , Gunnar Bahlenberg , Magnus Johansson , Lennart Olsson , Sven Göran Ökvist
IPC分类号： H03M112
CPC分类号： H03M1/12
摘要： A circuit, for digitizing an analogue signal includes an analogue to digital converter, a clip processor adapted to estimate a value for clipped digital signal samples, and a buffer adapted to dynamically store a plurality of digitized samples produced by the analogue to digital converter. The clip processor is adapted to read digitized samples from the buffer and replace clipped digitized samples with the estimated values, thereby mitigating the effects of clipping in an output of the circuit.
摘要翻译：用于数字化模拟信号的电路包括模数转换器，适于估计经裁剪的数字信号样本的值的剪辑处理器，以及适于动态地存储由模数转换器产生的多个数字化采样的缓冲器。剪辑处理器适于从缓冲器读取数字化样本，并用估计值替换剪切的数字化样本，从而减轻限幅在电路输出中的影响。

25. 发明授权

US6084871A Method for synchronization of transmitter and receiver at mobile radio system 失效
标题翻译：移动无线电系统发射机和接收机同步的方法
公开(公告)号：US6084871A
公开(公告)日：2000-07-04
申请号：US836985
申请日：1997-08-20
申请人： Bo Engstrom , Mikael Isaksson , Roger Larsson , Sven-Rune Olofsson , Michael Unneback , Goran Oqvist , Christer Ostberg , Lennart Olsson
发明人： Bo Engstrom , Mikael Isaksson , Roger Larsson , Sven-Rune Olofsson , Michael Unneback , Goran Oqvist , Christer Ostberg , Lennart Olsson
IPC分类号： H04B7/26 , H04L7/08 , H04L27/26
CPC分类号： H04L27/2602
摘要： A method of a mobile radio system for synchronization a transmitter and receiver. The system relates to MC/DS-CDMA-system. In the system information is transmitted digitally in frames. For that 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 indicates 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 the synchronization channel appoints the position of the data channel.
摘要翻译： PCT No.PCT / SE95 / 01382 Sec。 371日期1997年8月20日 102（e）日期1997年8月20日PCT 1995年11月21日PCT PCT。公开号WO96 / 17455 日期1996年6月6日一种用于同步发射机和接收机的移动无线电系统的方法。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对应于数据块D0，D1，D2等中的一个的长度。同步信道的重复距离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，在该位置处，同步信道的信息的解码指定数据信道的位置。

26. 发明授权

US06993068B1 Method for estimating and synchronizing frame boundaries of mis-aligned cross-talk signals in a DMT system 有权
标题翻译：用于估计和同步DMT系统中错误对齐的串扰信号的帧边界的方法
公开(公告)号：US06993068B1
公开(公告)日：2006-01-31
申请号：US09686031
申请日：2000-10-11
申请人： Mikael Isaksson , Lennart Olsson , Denis Julien Gilles Mestdagh
发明人： Mikael Isaksson , Lennart Olsson , Denis Julien Gilles Mestdagh
IPC分类号： H04B1/38
CPC分类号： H04B3/32 , H04L5/023 , H04L27/2656 , H04L27/2678
摘要： In a telecommunications transmission system using a DTM system as a multicarrier system and having at least two VDSL systems, each including a pair of modems, the at least two VDSL systems belonging to a single binder group common to both VDSL systems, a method in the DMT system for keeping DMT frames aligned to the same frame timing includes estimating the time mis-alignment and power of cross-talk DMT signals added to a received DMT signal when the estimate is used by the modem to synchronize its own frame timing to a main cross-talkers frame timing, using auto-correlation on the received signal and a delayed copy of the received signal, and detecting correlation maxima that determine the frame boundaries of different DMT components of the received signal.
摘要翻译：在使用DTM系统作为多载波系统并且具有至少两个VDSL系统的电信传输系统中，每个VDSL系统包括一对调制解调器，所述至少两个VDSL系统属于两个VDSL系统共同的单个绑定器组，用于保持DMT帧对准相同帧定时的DMT系统包括：当调制解调器使用该估计来同步其自身帧定时与主机时，估计添加到接收到的DMT信号的串扰DMT信号的时间不对齐和功率交互器帧定时，对接收信号使用自相关和接收信号的延迟拷贝，以及检测确定接收信号的不同DMT分量的帧边界的相关最大值。

27. 发明申请

US20070008881A1 Method in a transceiver for allocating transmission capacity between the two directions of transmission in wire line data communication 有权
标题翻译：用于在有线数据通信中在两个传输方向之间分配传输容量的收发器中的方法
公开(公告)号：US20070008881A1
公开(公告)日：2007-01-11
申请号：US10551769
申请日：2004-04-02
申请人： Mikael Isaksson
发明人： Mikael Isaksson
IPC分类号： H04L12/26 , H04L5/14
CPC分类号： H04B3/32 , H04L5/143 , H04L27/2602 , H04M11/066 , H04Q2213/13039
摘要： A method performed in one single transceiver for allocating transmission capacity between the two directions of transmission in wire line data communication. The method includes the step of allocating from the single transceiver different parts of the available bandwidth to different duplex methods simultaneously.
摘要翻译：一种用于在有线数据通信中的两个传输方向之间分配传输容量的单个收发机中执行的方法。该方法包括从单个收发机将可用带宽的不同部分同时分配给不同的双工方法的步骤。

28. 发明授权

US5652772A Method and apparatus for synchronization in digital transmisison systems of the OFDM type 失效
标题翻译： OFDM类型的数字传输系统中的同步方法和装置
公开(公告)号：US5652772A
公开(公告)日：1997-07-29
申请号：US537863
申请日：1996-01-22
申请人： Mikael Isaksson , Bo Engstrom
发明人： Mikael Isaksson , Bo Engstrom
IPC分类号： H04L27/26 , H04L7/00
CPC分类号： H04L27/2613 , H04L27/2662 , H04L27/2665 , H04L5/0007 , H04L5/0048
摘要： The invention relates to a method and apparatus for synchronization of transmitters and receivers in digital transmission systems of the OFDM type. The system uses FFT technique to carry out the modulation and demodulation procedures. According to the invention, the transmitter sends synchronization frames with known frequencies and phase positions and with known time intervals in certain time slots. The receiver carries out a series of time-shifted FFT operations over the time position where the synchronization frame is calculated to be. For each operation, a cross-correlation is carried out in the frequency plane of the output signal with the known frequency function of the synchronization frame. The correlation maximum is detected, and this determines the time slot which contains the synchronization frame, whereupon this is used as time base for the following data frames.
摘要翻译： PCT No.PCT / SE94 / 00560 Sec。 371日期1996年1月22日 102（e）日期1996年1月22日PCT提交1994年6月9日PCT公布。出版物WO95 / 03656 日期1995年2月2日本发明涉及OFDM类型的数字传输系统中的发射机和接收机的同步方法和装置。该系统采用FFT技术进行调制解调。根据本发明，发射机在某些时隙中发送具有已知频率和相位位置的同步帧以及已知的时间间隔。接收机在同步帧被计算的时间位置上进行一系列时移FFT运算。对于每个操作，在具有同步帧的已知频率函数的输出信号的频率平面中进行互相关。检测到相关最大值，并且这确定了包含同步帧的时隙，由此将其用作以下数据帧的时基。

29. 发明授权

US07817671B2 Method in a transceiver for allocating transmission capacity between the two directions of transmission in wire line data communication 有权
标题翻译：用于在有线数据通信中在两个传输方向之间分配传输容量的收发器中的方法
公开(公告)号：US07817671B2
公开(公告)日：2010-10-19
申请号：US10551769
申请日：2004-04-02
申请人： Mikael Isaksson
发明人： Mikael Isaksson
IPC分类号： H04J3/16 , H04J3/00 , H04J1/00
CPC分类号： H04B3/32 , H04L5/143 , H04L27/2602 , H04M11/066 , H04Q2213/13039
摘要： A method performed in one single transceiver for allocating transmission capacity between the two directions of transmission in wire line data communication. The method includes the step of allocating from the single transceiver different parts of the available bandwidth to different duplex methods simultaneously.
摘要翻译：一种用于在有线数据通信中的两个传输方向之间分配传输容量的单个收发机中执行的方法。该方法包括从单个收发机将可用带宽的不同部分同时分配给不同的双工方法的步骤。

30. 发明授权

US5812523A Method and device for synchronization at OFDM-system 失效
标题翻译：用于OFDM系统同步的方法和装置
公开(公告)号：US5812523A
公开(公告)日：1998-09-22
申请号：US413423
申请日：1995-03-30
申请人： Mikael Isaksson , Bo Engstroem
发明人： Mikael Isaksson , Bo Engstroem
IPC分类号： H04L27/26 , H04J11/00
CPC分类号： H04L27/2665 , H04L27/2657 , H04L27/2662
摘要： A method of demultiplexing OFDM signals and a receiver for such signals. More particularly the method is concerned with synchronization in an OFDM receiver. A signal is read into a synchronization unit, in the time domain, i.e., before fourier transforming the signal by means of an FFT processor. In the synchronization unit, a frame clock is derived for triggering the start of the FFT process and for controlling the rate at which data is supplied to the FFT processor. For OFDM reception, it is vital that the FFT process commences at the right point in time. Once the frame clock has been recovered, a frequency error can be estimated by the synchronization unit. The frequency error is used to control; an oscillator which generates a complex rotating vector which is, in turn, multiplied with the signal to compensate for frequency errors. The method can be used both with OFDM systems in which symbols are separated by guard spaces, and with OFDM systems in which symbols are pulse shaped.
摘要翻译：解复用OFDM信号的方法和用于这种信号的接收机。更具体地，该方法涉及OFDM接收机中的同步。在时域中，即在通过FFT处理器对信号进行变换之前，将信号读入同步单元。在同步单元中，导出用于触发FFT处理开始并用于控制向FFT处理器提供数据的速率的帧时钟。对于OFDM接收，FFT过程在正确的时间点开始至关重要。一旦帧时钟恢复，可以由同步单元估计频率误差。频率误差用于控制; 产生复数旋转矢量的振荡器，该复向旋转矢量又与信号相乘以补偿频率误差。该方法既可以与OFDM系统一起使用，其中符号由保护空间分开，并且其中符号是脉冲形状的OFDM系统。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式