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    Signal processing method
    1.
    发明授权
    Signal processing method 有权
    信号处理方法

    公开(公告)号：US09036742B2

    公开(公告)日：2015-05-19

    申请号：US14005415

    申请日：2012-03-15

    申请人： Matteo Butussi ,  Stefano Tomasin

    发明人： Matteo Butussi ,  Stefano Tomasin

    IPC分类号： H03D1/00 ,  H04L27/26 ,  H04L27/34

    CPC分类号： H04L27/2649 ,  H04L27/2604 ,  H04L27/3405

    摘要： A demapping scheme, having a low computational cost, suitable for any transmission in which only exhaustive demapping can guarantee good performance. The scheme, proposed in this document, can be used in any transmission based on no differential modulation. For example the proposed scheme can be directly applied to a transmission on flat fading AWGN channels or to a transmission on frequency selective channels after equalization or on each sub-carrier of an OFDM System. The proposed solution can be applied for the demapping of any communication system. The proposed scheme can be used for rotated and un-rotated constellation.

    摘要翻译： 具有低计算成本的解映射方案，适用于只能进行彻底解映射可以保证良好性能的任何传输。 本文中提出的方案可用于基于无差分调制的任何传输。 例如，所提出的方案可以直接应用于平坦衰落AWGN信道上的传输或在均衡之后或在OFDM系统的每个子载波上的频率选择信道上的传输。 所提出的解决方案可以应用于任何通信系统的解映射。 所提出的方案可用于旋转和未旋转星座。

    Fliterbank modulation system with pre-equalization
    2.
    发明申请
    Fliterbank modulation system with pre-equalization 审中-公开

    公开(公告)号：US20050259755A1

    公开(公告)日：2005-11-24

    申请号：US10526869

    申请日：2003-08-04

    申请人： Stefano Tomasin ,  Nevio Benvenuto

    发明人： Stefano Tomasin ,  Nevio Benvenuto

    IPC分类号： H04J1/05 ,  H04L25/03 ,  H04L25/497 ,  H04L27/26 ,  H04B14/04

    CPC分类号： H04L25/4975 ,  H04L25/03159 ,  H04L25/03343 ,  H04L25/497 ,  H04L27/2634 ,  H04L27/264 ,  H04L27/265 ,  H04L2025/03414

    摘要： Filterbank-based modulation systems comprise sender-processors (20,30) with inverse-fast-fourier-transformating-modules (23,33) and filtering-modules (24,34) and comprise receiver-processors (40) with fast-fourier-transformating-modules (43). Interference caused by said filtering-modules (24,34) is reduced by, in said sender-processors (20,30), introducing coding-modules (22,32) with further-filtering-modules (26,36) in feedback loops, and by, in said receiver-processors (40), introducing decoding-modules (44). Splitting-modules (21,31,41) and combining-modules (25,35,45) allow the use of signal streams and parallel filterbanks. Coding-modules (22 resp. 32) comprise sub-coding-modules (22-1,22-2, . . . , 22-a or 32-1,32-2, . . . ,32-b), filtering-modules (24 resp. 34) comprise sub-filtering-modules (24-1,24-2, . . . ,24-a or 34-1,34-2, . . . ,34-b), further-filtering-modules (26 resp. 36) comprise sub-further-filtering-modules (26-1,26-2, . . . ,26-a or 36-1,36-2, . . . ,36-b), and decoding-modules (44) comprise sub-decoding-modules (44-1,44-2, . . . ,44-c), all per signal stream. The sub-further-filtering-modules either receive input signals from outputs of said inverse-fast-fourier-transformating-modules and supply output signals via fast-fourier-transformating-modules to inputs of said sub-coding-modules via adding/subtracting-modules for reducing interference per signal stream (or per subcarrier/subband), or receive input signals from outputs of said sub-coding-modules and supply output signal to inputs of said sub-coding-modules via adding/subtracting-modules for reducing interference per signal stream (or per subcarrier/subband) as well as between signal streams (or between subcarriers/subbands) and introducing so-called fractionally spaced filterbank-based modulation systems.

    Frequency-domain decision feedback equalizing device and method
    3.
    发明申请
    Frequency-domain decision feedback equalizing device and method 有权
    频域决策反馈均衡装置和方法

    公开(公告)号：US20050259727A1

    公开(公告)日：2005-11-24

    申请号：US10525597

    申请日：2003-07-31

    申请人： Nevio Benvenuto ,  Stefano Tomasin ,  Luigi Agarossi

    发明人： Nevio Benvenuto ,  Stefano Tomasin ,  Luigi Agarossi

    IPC分类号： H04J11/00 ,  H04B3/06 ,  H04B7/005 ,  H04L25/03 ,  H03H7/30

    CPC分类号： H04L25/03146 ,  H04L25/03159 ,  H04L2025/0342 ,  H04L2025/0349 ,  H04L2025/03522 ,  H04L2025/03605 ,  H04L2025/0377 ,  H04L2025/03789

    摘要： Disclosed is a frequency-domain decision feedback equalizing method and device for single carrier modulation, preferably for use in a broadband communication system, wherein in a first section a fast Fourier transformation is performed on a first vector of signals inputted, and as a result a second vector of signals is provided, a feed forward equalization is performed by multiplying each of the components of said second vector of signals with equalization parameters, and as a result a third vector of signals is provided, an inverse fast Fourier transformation is performed on said third vector of signals, and as a result a fourth vector of signals is provided, and an output signal of said first section is provided on the basis of said fourth vector of signals; and in a second section a linear feedback filtering of a signal derived from an output signal of said second section is performed, and a filtered signal is provided, said filtered signal is added to said output signal of said first section, and an added signal is provided, and said output signal of said second section is generated by extracting samples from said added signal.

    摘要翻译： 公开了用于单载波调制的频域判决反馈均衡方法和装置，优选地用于宽带通信系统中，其中在第一部分中对所输入的第一信号矢量执行快速傅里叶变换，结果是 提供第二信号矢量，通过将所述第二信号矢量的每个分量与均衡参数相乘来执行前馈均衡，结果提供第三信号矢量，对所述信号进行快速傅立叶反变换 信号的第三矢量，并且作为结果提供第四信号矢量，并且基于所述第四信号矢量提供所述第一部分的输出信号; 并且在第二部分中，执行从所述第二部分的输出信号导出的信号的线性反馈滤波，并且提供滤波信号，所述滤波信号被加到所述​​第一部分的所述输出信号，并且相加信号是 并且通过从所述相加信号中提取样本来产生所述第二部分的所述输出信号。

    Frequency-domain multi-user access interference cancellation and nonlinear equalization in CDMA receivers
    4.
    发明授权
    Frequency-domain multi-user access interference cancellation and nonlinear equalization in CDMA receivers 有权
    CDMA接收机的频域多用户接入干扰消除和非线性均衡

    公开(公告)号：US07720134B2

    公开(公告)日：2010-05-18

    申请号：US10842699

    申请日：2004-05-10

    申请人： Stefano Tomasin ,  Nevio Benvenuto ,  Fabio Osnato ,  Marco Odoni ,  Filippo Spalla

    发明人： Stefano Tomasin ,  Nevio Benvenuto ,  Fabio Osnato ,  Marco Odoni ,  Filippo Spalla

    IPC分类号： H04B1/00

    CPC分类号： H04B1/7097

    摘要： A wireless CDMA communication system receiver receives a stream of chips generated by spreading data symbols formed by grouping bits of information at a wireless CDMA communication transmitter which are broadcast at a certain chip-rate. The received chips are de-spread and symbols pertaining to respective users are reconstructed. The stream of chips are formatted into blocks of chips, and an iterative block decision feedback equalization is performed in a frequency domain at the chip-rate of the broadcast stream of chips to remove inter-symbol interference by defining a transfer function. The chips generated are interleaved by spreading each data symbol being transmitted before broadcasting the stream of interleaved chips in distinct blocks of chips.

    摘要翻译： 无线CDMA通信系统接收器通过扩展通过以特定码片速率广播的无线CDMA通信发射机对信息比特分组而形成的数据符号进行扩展生成的码片流。 所接收的码片被解扩，并重建与各个用户相关的符号。 芯片流被格式化成芯片块，并且在频域中以芯片速率的芯片速率在频域中执行迭代块判决反馈均衡，以通过定义传递函数来消除符号间干扰。 所生成的码片通过在将不同的码片块广播交织的码片流之前扩展正在发送的每个数据符号进行交织。

    INTERPOLATED CHANNEL ESTIMATION FOR MOBILE OFDM SYSTEMS
    8.
    发明申请
    INTERPOLATED CHANNEL ESTIMATION FOR MOBILE OFDM SYSTEMS 有权
    用于移动OFDM系统的内插信道估计

    公开(公告)号：US20120020427A1

    公开(公告)日：2012-01-26

    申请号：US13182762

    申请日：2011-07-14

    申请人： Matteo Butussi ,  Stefano Tomasin

    发明人： Matteo Butussi ,  Stefano Tomasin

    IPC分类号： H04B15/00

    CPC分类号： H04L25/0232 ,  H04L27/2647

    摘要： In an OFDM system using pilot cells for channel estimation, time interpolation among pilot cells of different OFDM symbols is commonly used to improve the estimate. The estimated channel impulse response is also windowed to further reduce noise and disturbances. However, for a transmission over a time-varying channel, suboptimal time interpolation, implemented with a filter having only a few taps not matched to the maximum Doppler frequency, degrades channel estimation. As aliases can lead to an erroneous estimate of channel duration and consequent errors in windowing, the present invention implements a technique to detect aliases and correct the estimate of channel duration. Parameters of the detection techniques are optimized by an analysis that provides closed-form expressions of the false alarm and miss detection probabilities.

    摘要翻译： 在使用导频小区进行信道估计的OFDM系统中，通常使用不同OFDM符号的导频小区之间的时间插值来改善估计。 估计的信道脉冲响应也被窗口化以进一步减少噪声和干扰。 然而，对于通过时变信道的传输，用仅具有与最大多普勒频率不匹配的几个抽头的滤波器实现的次优时间插值降低了信道估计。 由于别名可能导致频道持续时间的错误估计和随之而来的窗口错误，本发明实现了一种检测别名并纠正频道持续时间估计的技术。 通过分析提供检测技术的参数，该分析提供虚警和封闭检测概率的闭合表达式。