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1. 发明申请

US20070053281A1 Method system and receiver for receiving a multi-carrier transmission 审中-公开
标题翻译：用于接收多载波传输的方法系统和接收机
公开(公告)号：US20070053281A1
公开(公告)日：2007-03-08
申请号：US10574350
申请日：2003-10-03
申请人： Ludwig Schwoerer
发明人： Ludwig Schwoerer
IPC分类号： H04J11/00
CPC分类号： H04L27/2647
摘要： Mobile handheld terminals receiving DVB transmission require relatively low power consumption and TDM based transmission can be used to reduce power of the terminals. In order find pilot carrier position at least one symbol is accessed which is adapted to establish a correspondence pattern for pilot carriers in a matrix of the symbols. Carriers of the symbol are power accumulation summed within the matrix for determining a power accumulation sum maximum for indicating a pilot carrier position.
摘要翻译：接收DVB传输的移动手持终端需要相对较低的功耗，并且可以使用基于TDM的传输来降低终端的功率。为了找到导频载波位置，访问至少一个符号，其适于在符号的矩阵中建立用于导频载波的对应模式。符号的载体是用于确定用于指示导频载波位置的功率累积和最大值的矩阵内的功率积累。

2. 发明授权

US08010588B2 Optimized multi-mode DFT implementation 失效
标题翻译：优化多模DFT实现
公开(公告)号：US08010588B2
公开(公告)日：2011-08-30
申请号：US11819510
申请日：2007-06-27
申请人： Yuhuan Xu , Ludwig Schwoerer
发明人： Yuhuan Xu , Ludwig Schwoerer
IPC分类号： G06F17/14
CPC分类号： G06F17/142 , H04L27/263 , H04L27/265
摘要： The present invention relates to a method and apparatus for implementing a discrete Fourier transformation (DFT) of a predetermined vector size, wherein at least one enhanced DFT module is provided by using at least one type of DFT module including multiplication by first and second types of twiddle factors in respective different multiplication stages separated by an intermediate integration stage, and generating the enhanced DFT module by combining the at least one type of DFT module with a recursive stage configured to multiply by a third type of twiddle factor and to selectively switch between a bypass function and a butterfly function in said recursive stage. Thereby, an implementation of non 2x-radix Fourier transformation can be achieved with moderate hardware complexity.
摘要翻译：本发明涉及一种用于实现预定向量大小的离散付里叶变换（DFT）的方法和装置，其中通过使用至少一种类型的DFT模块来提供至少一个增强型DFT模块，所述DFT模块包括第一和第二类型通过中间积分级分离的各个不同乘法阶段的旋转因子，以及通过将至少一种类型的DFT模块与被配置为乘以第三类旋转因子的递归级组合来生成增强型DFT模块，并且选择性地在旁路功能和蝴蝶功能在所述递归阶段。因此，可以以适度的硬件复杂度实现非2x基数傅里叶变换的实现。

3. 发明授权

US07751515B2 Method, system and receiver in receiving a multi-carrier transmission 有权
标题翻译：接收多载波传输的方法，系统和接收机
公开(公告)号：US07751515B2
公开(公告)日：2010-07-06
申请号：US10572806
申请日：2003-09-22
申请人： Ludwig Schwoerer , Andre Kaufmann , Jussi Vesma
发明人： Ludwig Schwoerer , Andre Kaufmann , Jussi Vesma
IPC分类号： H04L7/00
CPC分类号： H04L27/2655 , H04L27/2679
摘要： Mobile handheld terminals receiving DVB transmission require relatively low power consumption and TDM based transmission can be used to reduce power of the terminals. In order find pilot carrier position at least two symbols are accessed which are adapted to establish a correspondence pattern for pilot carriers in a matrix of the at least two symbols. Carriers of the first symbol are correlated with the corresponding carriers of the second symbol within the matrix for determining a correlation maximum for indicating a pilot carrier position.
摘要翻译：接收DVB传输的移动手持终端需要相对较低的功耗，并且可以使用基于TDM的传输来降低终端的功率。为了找到导频载波位置，访问至少两个符号，其适于建立至少两个符号的矩阵中的导频载波的对应模式。第一符号的载波与矩阵内的第二符号的相应载波相关，以确定用于指示导频载波位置的相关最大值。

4. 发明申请

US20080256159A1 Multi-Stream Fft for Mimo-Ofdm Systems 有权
标题翻译：用于Mimo-Ofdm系统的多流Fft
公开(公告)号：US20080256159A1
公开(公告)日：2008-10-16
申请号：US10588895
申请日：2005-06-30
申请人： Ludwig Schwoerer , Ernst Zielinski
发明人： Ludwig Schwoerer , Ernst Zielinski
IPC分类号： G06F17/14
CPC分类号： G06F17/142 , H04L1/06 , H04L27/265
摘要： The present invention proposes a signal processor for Fast Fourier Transformation, FFT, of MR, MR>1, input data streams of 2k samples each, supplied in parallel. After multiplexing the input data streams in an interlaced manner, the resulting stream is subjected to FFT. The FFT device has a pipeline architecture composed of k stages with a respective feedback path including a single delay element per each stage of the pipeline architecture. The delay element and timing signals are adapted to cope with FFT processing of the multiplexed streams using the single FFT device only. After processing, the FFT processed data stream is demultiplexed. The present invention also concerns a corresponding signal processing method.
摘要翻译：本发明提出了一种用于快速傅里叶变换，FFT，M SUB R 1，1/2的输入数据流的信号处理器，每个采样并行提供。以隔行扫描的方式复用输入数据流之后，对所得到的流进行FFT处理。 FFT装置具有由具有相应反馈路径的k个级组成的流水线架构，其包括每个流水线架构的每个阶段的单个延迟元件。延迟元件和定时信号仅适用于使用单个FFT器件来处理复用流的FFT处理。在处理之后，对FFT处理的数据流进行解复用。本发明还涉及相应的信号处理方法。

5. 发明申请

US20070299903A1 Optimized DFT implementation 审中-公开
标题翻译：优化DFT实现
公开(公告)号：US20070299903A1
公开(公告)日：2007-12-27
申请号：US11526122
申请日：2006-09-25
申请人： Yuhuan Xu , Ludwig Schwoerer
发明人： Yuhuan Xu , Ludwig Schwoerer
IPC分类号： G06F7/52
CPC分类号： G06F17/142
摘要： The present invention relates to a method and apparatus for implementing a discrete Fourier transformation (DFT) of a predetermined vector size, wherein at least one DFT module is configured to perform DFTs of a first predetermined number and of a vector size corresponding to a second predetermined number, to multiply by twiddle factors, and to perform DFTs of said second predetermined number and of a vector size corresponding to said first predetermined number. At least two of the at least one DFT module are combined to obtain the predetermined vector size. Thereby, an implementation of non 2x-radix Fourier transformation can be achieved with moderate hardware complexity.
摘要翻译：本发明涉及一种用于实现预定向量大小的离散付里叶变换（DFT）的方法和装置，其中至少一个DFT模块被配置为执行第一预定数量的DFT和对应于第二预定数量的矢量大小数字乘以旋转因子，并且执行所述第二预定数量的DFT和对应于所述第一预定数量的向量大小。组合至少一个DFT模块中的至少两个以获得预定的矢量大小。因此，可以以适度的硬件复杂度实现非二阶傅里叶变换的实现。

6. 发明授权

US08275052B2 FFT carrier frequency offset estimation for OFDM signal 有权
标题翻译： OFDM信号的FFT载波频偏估计
公开(公告)号：US08275052B2
公开(公告)日：2012-09-25
申请号：US11630537
申请日：2004-06-28
申请人： Ludwig Schwoerer , Andre Kaufmann
发明人： Ludwig Schwoerer , Andre Kaufmann
IPC分类号： H04L27/28
CPC分类号： H04L27/2657 , H04L27/2676 , H04L27/2685
摘要： There is being disclosed an OFDM signal receiver for detecting carrier frequency offset. When FFT transform of the signal is processed in the receiver, an estimator applies the spectrum shape of the FFT transform for estimating the carrier frequency offset.
摘要翻译：已经公开了用于检测载波频率偏移的OFDM信号接收机。当在接收机中处理信号的FFT变换时，估计器应用用于估计载波频率偏移的FFT变换的频谱形状。

7. 发明申请

US20100091829A1 OPTIMISED ARCHITECTURE FOR A DOWNSAMPLING FIR FILTER 审中-公开
标题翻译：用于阻燃FIR滤波器的优化架构
公开(公告)号：US20100091829A1
公开(公告)日：2010-04-15
申请号：US12593361
申请日：2007-03-28
申请人： Ludwig Schwoerer , Gerald Beier
发明人： Ludwig Schwoerer , Gerald Beier
IPC分类号： H03K5/159
CPC分类号： H03H17/0664 , H03H17/0223
摘要： An apparatus for generating filtered and downsampled data comprises a calculation unit, a polyphase addition unit and a downsampling unit operable in a data decimation phase and a data preserving phase. The calculation unit is arranged to receive input data and is configured to generate a first data part during the data decimation phase and a second part during the data preserving phase. The polyphase addition unit is configured to generate a third data part in dependence on said first and second data parts and to output said third data part to the downsampling unit.
摘要翻译：用于产生滤波和下采样数据的装置包括可在数据抽取阶段和数据保存阶段中操作的计算单元，多相位加法单元和下采样单元。计算单元被布置为接收输入数据，并且被配置为在数据抽取阶段期间生成第一数据部分，并且在数据保留阶段期间生成第二部分。多相加法单元被配置为根据所述第一和第二数据部分生成第三数据部分，并将所述第三数据部分输出到下采样单元。

8. 发明授权

US08059751B2 Frequency dependent phase rotation prior to mapping in an OFDM transmitter 失效
标题翻译：在OFDM发射机中映射之前的频率相位相位旋转
公开(公告)号：US08059751B2
公开(公告)日：2011-11-15
申请号：US12069239
申请日：2008-02-08
申请人： Ernst Zielinski , Ludwig Schwoerer
发明人： Ernst Zielinski , Ludwig Schwoerer
IPC分类号： H04L27/36 , H04L5/12 , H04L23/02
CPC分类号： H04L27/2607 , H04L27/2634
摘要： An input bit stream is phase rotated by reversing bit pairs and inverting bits. The manipulated bit stream is mapped to a symbol and the mapped symbol is converted to the time domain such that an output of the time domain conversion is an ordered set of N samples that allow efficient cyclic prefix insertion without rotation at the symbol level. A first portion of the set of samples is stored in a buffer, and the complete set of samples is output followed by the buffered first portion of the set of samples for transmission. The set of samples can be NIFFT samples of an OFDM symbol and the first portion can be NCP samples that make up the cyclic prefix CP. Re-ordering the bits can be done by swapping bit pairs and inverting one of the swapped pairs, or by trivial (1, −1, −j) phase rotation. The buffer is ¼ the length of prior art OFDM buffers and CP-related processing delays are significantly reduced.
摘要翻译：输入位流通过反转位对和反相位相位旋转。被操纵的比特流被映射到符号，并且将映射的符号转换为时域，使得时域转换的输出是允许有效的循环前缀插入而不在符号级别旋转的N个样本的有序集合。该组样本的第一部分被存储在缓冲器中，并且完整的样本集合被输出，随后是用于传输的采样集合的缓冲的第一部分。该样本集可以是OFDM符号的NIFFT样本，并且第一部分可以是组成循环前缀CP的NCP样本。重新排序位可以通过交换位对和反转交换对之一，或通过平凡（1，-1，-j）相位旋转来完成。缓冲器是1/4现有技术的OFDM缓冲器的长度，CP相关的处理延迟显着降低。

9. 发明申请

US20090202007A1 Frequency dependent phase rotation prior to mapping in an OFDM transmitter 失效
标题翻译：在OFDM发射机中映射之前的频率相位相位旋转
公开(公告)号：US20090202007A1
公开(公告)日：2009-08-13
申请号：US12069239
申请日：2008-02-08
申请人： Ernst Zielinski , Ludwig Schwoerer
发明人： Ernst Zielinski , Ludwig Schwoerer
IPC分类号： H04L27/28 , G06F17/14
CPC分类号： H04L27/2607 , H04L27/2634
摘要： An input bit stream is phase rotated by reversing bit pairs and inverting bits. The manipulated bit stream is mapped to a symbol and the mapped symbol is converted to the time domain such that an output of the time domain conversion is an ordered set of N samples that allow efficient cyclic prefix insertion without rotation at the symbol level. A first portion of the set of samples is stored in a buffer, and the complete set of samples is output followed by the buffered first portion of the set of samples for transmission. The set of samples can be NIFFT samples of an OFDM symbol and the first portion can be NCP samples that make up the cyclic prefix CP. Re-ordering the bits can be done by swapping bit pairs and inverting one of the swapped pairs, or by trivial (1, −1, −j) phase rotation. The buffer is ¼ the length of prior art OFDM buffers and CP-related processing delays are significantly reduced.
摘要翻译：输入位流通过反转位对和反相位相位旋转。被操纵的比特流被映射到符号，并且将映射的符号转换为时域，使得时域转换的输出是允许有效的循环前缀插入而不在符号级别旋转的N个样本的有序集合。该组样本的第一部分被存储在缓冲器中，并且完整的样本集合被输出，随后是用于传输的采样集合的缓冲的第一部分。该样本集可以是OFDM符号的NIFFT样本，并且第一部分可以是组成循环前缀CP的NCP样本。重新排序位可以通过交换位对并反转交换对之一，或通过平凡（1，-1，-j）相位旋转来完成。缓冲器是1/4现有技术的OFDM缓冲器的长度，CP相关的处理延迟显着降低。

10. 发明申请

US20090161771A1 Fft carrier frequency offset estimation for ofdm signal 有权
标题翻译： fdd信号的载波频偏估计
公开(公告)号：US20090161771A1
公开(公告)日：2009-06-25
申请号：US11630537
申请日：2004-06-28
申请人： Ludwig Schwoerer , Andre Kaufmann
发明人： Ludwig Schwoerer , Andre Kaufmann
IPC分类号： H04L27/28
CPC分类号： H04L27/2657 , H04L27/2676 , H04L27/2685
摘要： There is being disclosed an OFDM signal receiver for detecting carrier frequency offset. When FFT transform of the signal is processed in the receiver, an estimator applies the spectrum shape of the FFT transform for estimating the carrier frequency offset.
摘要翻译：已经公开了用于检测载波频率偏移的OFDM信号接收机。当在接收机中处理信号的FFT变换时，估计器应用用于估计载波频率偏移的FFT变换的频谱形状。

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