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1. 发明申请

US20080130771A1 CHANNEL ESTIMATION FOR OFDM SYSTEMS 失效
标题翻译： OFDM系统的信道估计
公开(公告)号：US20080130771A1
公开(公告)日：2008-06-05
申请号：US11946214
申请日：2007-11-28
申请人： Stefan Fechtel , Christian Rom , Benny Vejlgaard
发明人： Stefan Fechtel , Christian Rom , Benny Vejlgaard
IPC分类号： H04K1/10
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/0232
摘要： In a method for channel estimation of an OFDM signal transmitted via a channel, an initial channel transfer function is calculated by channel estimation. A channel impulse response is calculated on the basis of the initial channel transfer function. Values of the channel impulse response or of a filtered channel impulse response are classified as noise or as a signal as a function of the level of the values of the channel impulse or of the level of the values of the filtered channel impulse response. A noise-reduced channel impulse response is calculated on the basis of the channel impulse response using the classification, and a noise-reduced channel transfer function is calculated on the basis of this noise-reduced channel impulse response.
摘要翻译：在通过信道发送的OFDM信号的信道估计方法中，通过信道估计来计算初始信道传递函数。基于初始信道传递函数计算信道脉冲响应。信道脉冲响应或经滤波的信道脉冲响应的值被分类为噪声或作为信道脉冲的值的水平或滤波的信道脉冲响应的值的电平的函数的信号。基于使用分类的信道脉冲响应来计算噪声降低的信道脉冲响应，并且基于该降噪信道脉冲响应来计算噪声降低的信道传递函数。

2. 发明授权

US08031787B2 Channel estimation for OFDM systems 失效
标题翻译： OFDM系统的信道估计
公开(公告)号：US08031787B2
公开(公告)日：2011-10-04
申请号：US11946214
申请日：2007-11-28
申请人： Stefan Fechtel , Christian Rom , Benny Vejlgaard
发明人： Stefan Fechtel , Christian Rom , Benny Vejlgaard
IPC分类号： H04K1/00
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/0232
摘要： In a method for channel estimation of an OFDM signal transmitted via a channel, an initial channel transfer function is calculated by channel estimation. A channel impulse response is calculated on the basis of the initial channel transfer function. Values of the channel impulse response or of a filtered channel impulse response are classified as noise or as a signal as a function of the level of the values of the channel impulse or of the level of the values of the filtered channel impulse response. A noise-reduced channel impulse response is calculated on the basis of the channel impulse response using the classification, and a noise-reduced channel transfer function is calculated on the basis of this noise-reduced channel impulse response.
摘要翻译：在通过信道发送的OFDM信号的信道估计方法中，通过信道估计来计算初始信道传递函数。基于初始信道传递函数计算信道脉冲响应。信道脉冲响应或经滤波的信道脉冲响应的值被分类为噪声或作为信道脉冲的值的水平或滤波的信道脉冲响应的值的电平的函数的信号。基于使用分类的信道脉冲响应来计算噪声降低的信道脉冲响应，并且基于该降噪信道脉冲响应来计算噪声降低的信道传递函数。

3. 发明授权

US07039093B2 Arrangement for adaptive baseband filter selection 失效
公开(公告)号：US07039093B2
公开(公告)日：2006-05-02
申请号：US10173463
申请日：2002-06-14
申请人： Antoine J. Rouphael , Benny Vejlgaard , Thomas Klingenbrunn , Lichung Chu
发明人： Antoine J. Rouphael , Benny Vejlgaard , Thomas Klingenbrunn , Lichung Chu
IPC分类号： H04B1/69
CPC分类号： H04L27/00
摘要： A digital signal detector arrangement comprises at least two selectable baseband filters for receiving a digital signal, a signal estimator receiving the output signal of the selected baseband filter, a modulator unit receiving the estimated signal from the signal estimator, a subtractor for subtracting the modulated signal from the received digital signal, and a determination unit receiving the signal from the subtractor for selecting the baseband filter.

4. 发明授权

US06603749B1 Method for estimation of an impulse response of a signal transmission channel and mobile station 有权
标题翻译：用于估计信号传输信道和移动台的脉冲响应的方法
公开(公告)号：US06603749B1
公开(公告)日：2003-08-05
申请号：US09395240
申请日：1999-09-13
申请人： Benny Vejlgaard
发明人： Benny Vejlgaard
IPC分类号： H04Q700
CPC分类号： H04L25/0212
摘要： A method for estimation of an impulse response (h) of a signal transmission channel (1) in a mobile communication system and a mobile station (15), especially a mobile phone, including a device for estimating the impulse response (h) of the signal transmission channel (1) in the mobile communication system are described. The invention allows a realization of mobile stations for use in a code division multiple access (CDMA) transmission mode and in a time division multiple access (TDMA) transmission mode with less implementation complexity. The estimation device includes exactly one combined channel estimator (45). The mobile station (15) receives signals (20) transmitted via the signal transmission channel (1) either in the TDMA transmission mode or in the CDMA transmission mode. The exactly one combined channel estimator (45) estimates the impulse response (h) of the signal transmission channel (1) according to the transmission mode.
摘要翻译：一种用于估计移动通信系统和移动站（15）中的信号传输信道（1）的脉冲响应（h）的方法，特别是移动电话，包括用于估计所述脉冲响应（h）的设备描述移动通信系统中的信号传输信道（1）。本发明允许在码分多址（CDMA）传输模式和时分多址（TDMA）传输模式中使用移动站的实现，具有较少的实现复杂度。估计装置仅包括一个组合信道估计器（45）。移动台（15）以TDMA发送模式或CDMA发送模式，经由信号发送信道（1）发送的信号（20）。恰好一个组合信道估计器（45）根据传输模式估计信号传输信道（1）的脉冲响应（h）。

5. 发明授权

US07092438B2 Multilevel decision feedback equalizer 失效
公开(公告)号：US07092438B2
公开(公告)日：2006-08-15
申请号：US10057466
申请日：2002-01-22
申请人： Antoine J. Rouphael , Benny Vejlgaard , Thomas Klingenbrunn , Lichung Chu
发明人： Antoine J. Rouphael , Benny Vejlgaard , Thomas Klingenbrunn , Lichung Chu
IPC分类号： H04B1/38 , H04L27/10 , H04L27/18 , H04L5/16
CPC分类号： H04L25/03178 , H04L25/03057
摘要： A method of processing a sequence of digital symbols comprises the steps of processing the sequence of digital symbols and determining an uncertainty in the processing. If the uncertainty exceeds a predetermined threshold, then the method further comprises the steps of processing at least two sequences of digital symbols wherein at least one parameter is set differently in each sequence, and deciding upon a calculated error for each sequence which sequence is used to generate an output signal.

6. 发明授权

US07190740B2 Arrangement for dynamic DC offset compensation 有权
标题翻译：动态直流偏移补偿的布置
公开(公告)号：US07190740B2
公开(公告)日：2007-03-13
申请号：US10224047
申请日：2002-08-19
申请人： Lichung Chu , Thomas Klingenbrunn , Benny Vejlgaard , Antoine J. Rouphael
发明人： Lichung Chu , Thomas Klingenbrunn , Benny Vejlgaard , Antoine J. Rouphael
IPC分类号： H04L25/06
CPC分类号： H04L25/067 , H04L25/03305
摘要： A DC tracking arrangement includes a first tracking unit for slow tracking receiving an input signal and generating a first output signal, a second tracking unit for fast tracking receiving the input signal and generating a second output signal, and a decision unit receiving the first and second output signal for selecting the first or second output signal.
摘要翻译： DC跟踪装置包括用于慢跟踪接收输入信号并产生第一输出信号的第一跟踪单元，用于快速跟踪接收输入信号并产生第二输出信号的第二跟踪单元，以及接收第一和第二信号的判定单元用于选择第一或第二输出信号的输出信号。

7. 发明授权

US07558343B2 Tap-selectable viterbi equalizer 失效
标题翻译：点击式可选维特比均衡器
公开(公告)号：US07558343B2
公开(公告)日：2009-07-07
申请号：US09990844
申请日：2001-11-21
申请人： Thomas Klingenbrunn , Lichung Chu , Antoine J. Rouphael , Benny Vejlgaard
发明人： Thomas Klingenbrunn , Lichung Chu , Antoine J. Rouphael , Benny Vejlgaard
IPC分类号： H04L27/06 , H03M13/03
CPC分类号： H04L25/03203 , H04L25/03235 , H04L2025/03401 , H04L2025/03726
摘要： A tap-selectable Viterbi equalizer comprises means for determining at least one symbol from a previous determination assigned to a first state, means for determining a second state of the plurality of states and determining a surviving path metric by comparing path metrics originating from the determined symbol, means for determining the value of a previous symbol with respect to the symbol of the surviving state, and calculating means for generating a reduced trellis by calculating only path metrics for states in which the previous symbol has the determined value.
摘要翻译：抽头可选维特比均衡器包括用于从分配给第一状态的先前确定中确定至少一个符号的装置，用于确定多个状态的第二状态的装置，以及通过比较源自所确定的符号的路径度量来确定幸存路径度量，用于确定相对于所述幸存状态的符号的先前符号的值的装置，以及用于通过仅计算所述先前符号具有所述确定值的状态的路径度量来生成缩小网格的计算装置。

8. 发明授权

US06751775B2 Tap-selectable reduced state sequence estimator 失效
标题翻译：抽头可选缩减状态序列估计器
公开(公告)号：US06751775B2
公开(公告)日：2004-06-15
申请号：US09990633
申请日：2001-11-21
申请人： Lichung Chu , Thomas Klingenbrunn , Benny Vejlgaard , Antoine J. Rouphael
发明人： Lichung Chu , Thomas Klingenbrunn , Benny Vejlgaard , Antoine J. Rouphael
IPC分类号： H03M1303
CPC分类号： H03M13/6331 , H03M13/3955 , H03M13/3961 , H03M13/41 , H03M13/6502
摘要： A method of determining a trellis from a sequence of n symbols in a Viterbi detector. The method includes the steps of receiving a sequence of n symbols, defining partitioned sets according to a decision tree structure, and determining size of each set partitioning according to tap energy of the channel. The method also includes steps of determining a reduced set of connection paths between the current layer and a destination layer in the trellis by determining a value of a most likely oldest partitioned set in a current layer; and calculating branch metrics only for the current layers in the trellis in which the oldest partitioned set matches the determined value.
摘要翻译：一种从维特比检测器中的n个符号的序列确定网格的方法。该方法包括以下步骤：接收n个符号的序列，根据决策树结构定义分割集，以及根据信道的抽头能量确定每个集合分割的大小。该方法还包括以下步骤：通过确定当前层中最可能最旧的分区集合的值来确定网格中当前层和目的地层之间的连接路径的简化集合; 并且仅计算最旧分区集合与确定的值匹配的网格中的当前层的分支度量。

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