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公开(公告)号：US08787493B2
公开(公告)日：2014-07-22
申请号：US13817604
申请日：2011-08-12
申请人： Eckhard Ohlmer , Udo Wachsmann
发明人： Eckhard Ohlmer , Udo Wachsmann
IPC分类号： H04L25/49
CPC分类号： H04L1/0042 , H04B7/0417 , H04B7/0465 , H04B7/063 , H04B7/0634
摘要： A technique for precoding a signal to be transmitted over a physical channel from a sender to a receiver is provided. A method includes receiving precoding information and applying precoding matrix at the sender based on the precoding information. The precoding information is received via a feedback mechanism from the receiver. The application of the precoding matrix results in a precoded signal for transmission over the physical channel. The precoding matrix enhances mutual information at the receiver.
摘要翻译： 提供了一种用于对通过物理信道从发送方发送到接收方的信号进行预编码的技术。 一种方法包括基于预编码信息接收预编码信息并在发送方应用预编码矩阵。 经由来自接收机的反馈机制接收预编码信息。 预编码矩阵的应用导致用于在物理信道上传输的预编码信号。 预编码矩阵增强了接收机的互信息。
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公开(公告)号：US20130188751A1
公开(公告)日：2013-07-25
申请号：US13817604
申请日：2011-08-12
申请人： Eckhard Ohlmer , Udo Wachsmann
发明人： Eckhard Ohlmer , Udo Wachsmann
IPC分类号： H04L1/00
CPC分类号： H04L1/0042 , H04B7/0417 , H04B7/0465 , H04B7/063 , H04B7/0634
摘要： A technique for precoding a signal to be transmitted over a physical channel (102; 206) from a sender to a receiver is provided. As to a method aspect, a method (100) comprises the steps of receiving (104) precoding information and applying (108) a precoding matrix (W) at the sender based on the precoding information. The precoding information is received via a feedback mechanism from the receiver. The application results in a precoded signal (216, 218) for transmission over the physical channel (102; 206). The precoding matrix (W) enhances mutual information (I) at the receiver.
摘要翻译： 提供了一种用于对通过物理信道（102; 206）从发送方发送到接收方的信号进行预编码的技术。 对于方法方面，方法（100）包括以下步骤：基于预编码信息接收（104）预编码信息并在发送器处应用（108）预编码矩阵（W）。 经由来自接收机的反馈机制接收预编码信息。 应用程序产生用于通过物理信道（102; 206）传输的预编码信号（216,218）。 预编码矩阵（W）增强了接收机处的互信息（I）。
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公开(公告)号：US20100309810A1
公开(公告)日：2010-12-09
申请号：US12867249
申请日：2009-02-09
申请人： Udo Wachsmann
发明人： Udo Wachsmann
CPC分类号： H04L25/067 , H04L1/0045 , H04L1/0066 , H04L1/1812
摘要： A technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed. In a method realisation, the technique includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNR values are attenuated, and determining the scaling factor for soft bit quantization dependent on the weighted average.
摘要翻译： 提出了一种用于在衰落信道环境中确定用于软比特量化的缩放因子的技术。 在方法实现中，该技术包括重复地确定衰落信道的SNR值，基于多个SNR值来计算加权平均值，其中执行加权，使得极值SNR值的贡献被衰减，并且确定缩放因子 用于取决于加权平均值的软位量化。
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公开(公告)号：US07826342B2
公开(公告)日：2010-11-02
申请号：US10541790
申请日：2003-01-15
IPC分类号： H04J11/00
CPC分类号： H04L27/2647 , H04L1/0003 , H04L1/0009 , H04L25/0204 , H04L25/022
摘要： The present invention concerns a method for estimating the time-dispersion of a channel comprising D subchannels, wherein one computes from a received signal a set of estimated Channel Transfer Factors (CTF's) Ĥ[ν], where ν(0≦ν≦D) is the subchannel number, said method comprising a step of calculating, for a predetermined strictly positive integer d, a correlation factor Cd representing the correlations, both in amplitude and in phase, between pairs Ĥ[ν] and Ĥ[ν+d] of said computed CTF estimates. By an appropriate choice of d, the time-dispersion resolution can be adapted to most prevalent channels. The correlation is optionally corrected according to the mean channel estimation signal-to-noise ratio. This method can be used for many applications where knowing the time-dispersion characteristics of a channel is required, and is, for example, particularly suitable for designing a channel estimation filter, and for link adaptation. Application to devices and apparatus implementing these methods.
摘要翻译： 本发明涉及一种用于估计包括D个子信道的信道的时间分散的方法，其中一个从接收信号计算一组估计的信道传送因子（CTF's）Ĥ[＆ngr]，其中＆ngr;（0＆nlE;＆ngr; ＆lt; nlE; D）是子信道号，所述方法包括以下步骤：对于预定的严格正整数d，表示对之间的相关性的相关因子Cd（在幅度和相位上），Λ[＆ngr]和Ĥ[ ＆ngr; + d]。 通过d的适当选择，时间 - 分散度分辨率可以适应于最流行的频道。 可以根据平均信道估计信噪比来校正相关性。 该方法可以用于需要知道信道的时间 - 色散特性的许多应用，并且例如特别适用于设计信道估计滤波器和用于链路自适应。 应用于实现这些方法的设备和设备。
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公开(公告)号：US07366517B2
公开(公告)日：2008-04-29
申请号：US11492916
申请日：2006-07-26
申请人： Ralf Keller , Ralf Tonjes , Wolfgang Stahl , Jörn Thielecke , Jörg Huschke , Udo Wachsmann
发明人： Ralf Keller , Ralf Tonjes , Wolfgang Stahl , Jörn Thielecke , Jörg Huschke , Udo Wachsmann
IPC分类号： H04Q7/20
摘要： Method of arranging a cellular radio network in a geographical area which is already covered by an existing cellular radio network, wherein cell clusters of the cellular radio network to be introduced and using a specific transmission frequency are located in areas determined by connecting at least two cells of the existing cellular radio network using the specific transmission frequency, and wherein the cell clusters are arranged such that they do not overlap with the cells of the existing cellular radio network. The cell clusters of the introduced cellular radio network may be adjusted by reducing the cell size of cell clusters of the introduced cellular radio network, and by introducing new cells into cell clusters of the introduced cellular radio network. The invention allows to reuse frequencies of an existing cellular radio network by an introduced cellular radio network in the same geographical area.
摘要翻译： 在已经被现有的蜂窝无线电网络覆盖的地理区域中布置蜂窝无线电网络的方法，其中要引入并使用特定传输频率的蜂窝无线电网络的小区集群位于通过连接至少两个小区 使用特定传输频率的现有蜂窝无线电网络，并且其中小区群集被布置为使得它们不与现有蜂窝无线电网络的小区重叠。 引入的蜂窝无线电网络的小区群可以通过减小引入的蜂窝无线电网络的小区簇的小区大小，并且通过将新小区引入到所引入的蜂窝无线电网络的小区簇中来进行调整。 本发明允许在相同地理区域中由引入的蜂窝无线电网络重用现有蜂窝无线电网络的频率。
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公开(公告)号：US07106709B2
公开(公告)日：2006-09-12
申请号：US09994944
申请日：2001-11-28
申请人： Stefan Davidsson , Mathias Pauli , Peter Schramm , Fabian Wenger , Udo Wachsmann , Roger Walther
发明人： Stefan Davidsson , Mathias Pauli , Peter Schramm , Fabian Wenger , Udo Wachsmann , Roger Walther
CPC分类号： H04L27/2657 , H04L7/027 , H04L7/04 , H04L27/2602 , H04L27/2662 , H04L27/2675 , H04L27/2679 , H04L27/2695 , H04L2027/0028 , H04L2027/0095
摘要： A radio receiver system (30) comprises a radio receiver (41), a receiver sample clock (60), which is used for sampling a modulated base-band signal; and a timing correction unit (100). The timing correction unit (100) performs, in the frequency domain, a timing drift compensation between a transmitter sample clock (66) and the receiver sample clock (60). In one example context of implementation, the plural modulated radio frequency carriers have been modulated using Orthogonal Frequency Division Multiplexing (OFDM).
摘要翻译： 无线电接收机系统（30）包括无线电接收机（41），接收机采样时钟（60），用于对已调制的基带信号进行采样; 和定时校正单元（100）。 定时校正单元（100）在频域中执行发射机采样时钟（66）和接收机采样时钟（60）之间的定时漂移补偿。 在一个实施例的上下文中，已经使用正交频分复用（OFDM）调制了多个调制的射频载波。
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公开(公告)号：US08693460B2
公开(公告)日：2014-04-08
申请号：US13061908
申请日：2008-09-05
IPC分类号： H04J3/06
CPC分类号： H04B7/2684 , H04W56/0045
摘要： The invention relates to a technique for controlling a synchronization of a terminal device (10) with a wireless network, e.g. an LTE network, wherein data are transmitted as a continuous data signal on a radio interface (11, 12) while being processed block-wise in the terminal (10). A method embodiment of the technique for achieving at least a downlink (11) synchronization comprises establishing a time-address mapping (TAM, 36) indicative of an association of a reference time value of an internal clock (32) with a reference address in the reception data buffer (16); determining an address of data samples representing the received data block in the reception data buffer (16) based on the time-address mapping; and initiating a block-wise reading of the data block from the reception data buffer (16) based on the determined address.
摘要翻译： 本发明涉及一种用于控制终端设备（10）与无线网络的同步的技术，例如， LTE网络，其中数据在无线接口（11,12）上作为连续数据信号发送，同时在终端（10）中以块方式进行处理。 用于实现至少下行链路（11）同步的技术的方法实施例包括建立指示内部时钟（32）的参考时间值与参考地址的关联的时间地址映射（TAM，36） 接收数据缓冲器（16）; 基于时间地址映射确定在接收数据缓冲器（16）中表示接收数据块的数据样本的地址; 以及基于所确定的地址，从所述接收数据缓冲器（16）发起对所述数据块的块状读取。
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公开(公告)号：US20090052598A1
公开(公告)日：2009-02-26
申请号：US11955263
申请日：2007-12-12
申请人： Fabian WENGER , Uwe Dettmar , Udo Wachsmann , Peter Schramm
发明人： Fabian WENGER , Uwe Dettmar , Udo Wachsmann , Peter Schramm
IPC分类号： H04L7/00
CPC分类号： H04L7/042 , H04L7/007 , H04L7/04 , H04L27/2613 , H04L27/2662 , H04W56/0085
摘要： A method and a device of providing timing information within a wireless communication system is described. The timing information is extracted from a received transmit signal. The inventive method comprises the steps of providing a training signal on the receiver side relating to a known signal portion of the transmit signal, scaling the training signal, quantizing the scaled training signal, correlating one or more parts of the received transmit signal with the scaled training signal to obtain one or more correlation results, and determining the timing information on the basis of the correlation results.
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公开(公告)号：US07324599B2
公开(公告)日：2008-01-29
申请号：US10751120
申请日：2004-01-05
申请人： Georg Frank , Mathias Pauli , Udo Wachsmann , Peter Schramm
发明人： Georg Frank , Mathias Pauli , Udo Wachsmann , Peter Schramm
IPC分类号： H04K1/10
CPC分类号： H04L27/2657 , H04L27/2679
摘要： In order to correct frequency deviations of signals in a multicarrier system, such as a OFDM-system, the present invention provides a frequency tracker and a method to operate the same. The frequency tracker is based on a decision directed digital phase locked loop exhibiting a predictive character. On the basis of an estimated phase offset for a received signal (signal component, signal symbol) a predicted phase offset is calculated and applied to the signal (signal component, signal symbol). Further, received signals (signal components, signal symbols) are sampled and for each sample a sample phase offset to be corrected is calculated in dependence to the related estimated phase offset to incorporate the predictive character. In particular, the predicted sample phase offsets are calculated as a function of a corresponding predicted phase offset and a measure being indicative of a distance, in the time domain, between a corresponding phase reference point for the predicted phase offset and a phase reference point defined for a specific part of the received signal, preferably for a preceding preamble signal.
摘要翻译： 为了校正诸如OFDM系统的多载波系统中的信号的频率偏差，本发明提供一种频率跟踪器及其操作方法。 频率跟踪器基于呈现预测字符的决策指向的数字锁相环。 基于接收信号（信号分量，信号符号）的估计相位偏移，计算预测相位偏移并将其施加到信号（信号分量，信号符号）。 此外，接收到的信号（信号分量，信号符号）被采样，并且对于每个采样，根据相关的估计相位偏移来计算要校正的采样相位偏移以并入预测字符。 特别地，预测的采样相位偏移作为相应的预测相位偏移的函数计算，并且指示在时域中在预测相位偏移的相应相位参考点和定义的相位参考点之间的距离的度量 对于接收信号的特定部分，优选地用于前一个前导信号。
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公开(公告)号：US20070225002A1
公开(公告)日：2007-09-27
申请号：US11798560
申请日：2007-05-15
申请人： Ralf Keller , Ralf Tonjes , Wolfgang Stahl , Jorn Thielecke , Jorg Huschke , Udo Wachsmann
发明人： Ralf Keller , Ralf Tonjes , Wolfgang Stahl , Jorn Thielecke , Jorg Huschke , Udo Wachsmann
IPC分类号： H04Q7/20
摘要： Method of arranging a cellular radio network in a geographical area which is already covered by an existing cellular radio network, wherein cell clusters of the cellular radio network to be introduced and using a specific transmission frequency are located in areas determined by connecting at least two cells of the existing cellular radio network using the specific transmission frequency, and wherein the cell clusters are arranged such that they do not overlap with the cells of the existing cellular radio network. The cell clusters of the introduced cellular radio network may be adjusted by reducing the cell size of cell clusters of the introduced cellular radio network, and by introducing new cells into cell clusters of the introduced cellular radio network. The invention allows to reuse frequencies of an existing cellular radio network by an introduced cellular radio network in the same geographical area.
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