公开(公告)号：US07869497B2

公开(公告)日：2011-01-11

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： H03H7/30

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

摘要： A fast Fourier transformation is performed on a first vector of signals, 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 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, and as a result a fourth vector of signals is provided. An output signal of said first section is provided on the basis of said fourth vector of signals. In a second section a signal derived from an output signal of said second section is is filtered via linear feedback filtering and the filtered signal is added to said first section output signal, and an added signal is provided, and said second section output signal is generated by extracting samples from said added signal.

摘要翻译： 对第一信号矢量进行快速傅里叶变换，结果提供第二信号矢量。 通过将所述第二矢量的每个分量与均衡参数相乘来执行前馈均衡，结果提供第三矢量信号。 对所述第三矢量进行快速傅立叶逆变换，结果提供第四矢量信号。 基于所述第四信号矢量提供所述第一部分的输出信号。 在第二部分中，通过线性反馈滤波对来自所述第二部分的输出信号的信号进行滤波，并将经滤波的信号加到所述第一部分输出信号，并且提供相加信号，并且产生所述第二部分输出信号 通过从所述添加的信号中提取样本。

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。

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。

公开(公告)号：US20050249269A1

公开(公告)日：2005-11-10

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： H04B1/707

CPC分类号： H04B1/7097

摘要： A method for canceling interference at a wireless code division multiple access (CDMA) communication receiver is provided. The 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 method includes formatting the stream of chips into blocks of chips, and performing an iterative block decision feedback equalization 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 transfer function is defined based upon iteration cycles as a function of data detected in a preceding iteration cycle. 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： 提供一种用于消除无线码分多址（CDMA）通信接收机的干扰的方法。 无线CDMA通信系统接收机通过扩频通过以特定码片速率广播的无线CDMA通信发射机对信息组进行分组而形成的数据符号来接收所生成的芯片流。 所接收的码片被解扩，并重建与各个用户相关的符号。 该方法包括将芯片流格式化为芯片块，并以频域的芯片速率在频域中执行迭代块判定反馈均衡，以通过定义传递函数来消除符号间干扰。 传递函数基于迭代周期来定义，作为在前一迭代循环中检测到的数据的函数。 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。

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.

公开(公告)号：US4979211A

公开(公告)日：1990-12-18

申请号：US534321

申请日：1990-06-05

申请人： Nevio Benvenuto ,  Thomas W. Goeddel

发明人： Nevio Benvenuto ,  Thomas W. Goeddel

IPC分类号： H04L27/00

CPC分类号： H04L27/0012

摘要： An unknown voiceband digital data modem signal is classified as being generated by one of a plurality of possible digital data modem signal sources, e.g., CCITT V.29, CCITT V.32, CCITT V.33 or the like digital data modems. Classification is achieved by employing a blind, i.e., self-recovering, adaptive equalizer to remove effects of linear channel impairments and to generate a sequence of magnitude estimates at the symbol rate of the unknown voiceband digital data modem signal. The sequence of magnitude estimates is compared to predetermined representations of known possible voiceband digital data modem signals and the results of the comparison are used to identify the digital data modem signal source of the signal. In one example, the predetermined representations are templates of conditional density functions of magnitude estimates obtained from known voiceband digital data modem signals generated by corresponding digital data modem signal sources. The symbol rate detector detects bit rate and type of modulation.

摘要翻译： 未知的话音频带数字数据调制解调器信号被分类为由多个可能的数字数据调制解调器信号源（例如CCITT V.29，CCITT V.32，CCITT V.33或类似的数字数据调制解调器）之一产生。 通过采用盲目的，即自恢复的自适应均衡器来消除线性信道损伤的影响并且在未知话音频带数字数据调制解调器信号的符号速率下产生幅度估计序列来实现分类。 将幅度估计的序列与已知可能的语音频带数字数据调制解调器信号的预定表示进行比较，并且比较结果用于识别信号的数字数据调制解调器信号源。 在一个示例中，预定表示是从由对应的数字数据调制解调器信号源产生的已知语音频带数字数据调制解调器信号获得的幅度估计的条件密度函数的模板。 符号速率检测器检测比特率和调制类型。

公开(公告)号：US4815136A

公开(公告)日：1989-03-21

申请号：US927506

申请日：1986-11-06

申请人： Nevio Benvenuto

发明人： Nevio Benvenuto

IPC分类号： H04M11/00 ,  H04B14/04 ,  H04L27/22 ,  G10L5/06

CPC分类号： H04B14/04

摘要： A signal is classified as one among a plurality of classifications by employing the autocorrelation of a complex low-pass version of the signal, i.e., the complex autocorrelation. The normalized magnitude of the complex autocorrelation obtained at a prescribed delay interval, i.e., "lag", is compared to predetermined threshold values to classify the signal as having one of a plurality of baud rates.

摘要翻译： 通过采用复合低通版本的信号的自相关，即复数自相关，信号被分类为多个分类中的一个。 将以规定的延迟间隔（即“滞后”）获得的复数自相关的归一化幅度与预定阈值进行比较，以将信号分类为多个波特率中的一个。

公开(公告)号：US4677423A

公开(公告)日：1987-06-30

申请号：US816578

申请日：1986-01-06

申请人： Nevio Benvenuto ,  Guido Bertocci

发明人： Nevio Benvenuto ,  Guido Bertocci

IPC分类号： H04B14/06 ,  H03M3/04 ,  H03M7/38 ,  H03M7/00

CPC分类号： H03M3/042

摘要： In an ADPCM coder and decoder including a so-called locking-unlocking adaptation speed control, the adaptation speed is locked to a very slow, almost constant, speed of adaptation for voiceband data and partial band energy signals, i.e., tones and tone like signals, and is unlocked to achieve a fast speed of adaptation for speech. When a so-called partial band energy signal is being inputted, the adaptation speed is biased toward the unlocked state and when a transition occurs from a partial band energy signal to another such signal, the adaptation speed is set to the totally unlocked state and coefficients of an adaptive predictor are set to prescribed values. This is done in both the coder and decoder to minimize generation of impulse noise in the decoder output.

摘要翻译： 在包括所谓的锁定解锁适应速度控制的ADPCM编码器和解码器中，自适应速度被锁定到语音频带数据和部分频带能量信号（即音调和音调信号）的非常慢的，几乎恒定的适应速度 并且被解锁以实现用于语音的快速适应速度。 当输入所谓的部分频带能量信号时，自适应速度偏向于解锁状态，并且当从部分频带能量信号到另一个这样的信号发生转变时，自适应速度被设置为完全解锁状态，系数 的自适应预测值被设置为规定值。 这在编码器和解码器中完成，以最小化解码器输出中的脉冲噪声的产生。

公开(公告)号：US4815137A

公开(公告)日：1989-03-21

申请号：US927503

申请日：1986-11-06

申请人： Nevio Benvenuto

发明人： Nevio Benvenuto

IPC分类号： H04M11/00 ,  H04B14/04 ,  H04L27/00 ,  H04L27/22 ,  G10L5/06

CPC分类号： H04L27/0012 ,  H04B14/04

摘要： A signal is classified as being one among a plurality of classifications by employing a prescribed relationship between absolute moments of a complex low-pass version of the signal. Specifically, the prescribed relationship is related to the second order moment of the magnitude of the complex low-pass version being normalized by the first order moment squared. This results in a so-called normalized variance which is compared to predetermined threshold values to classify the signal as having one of a plurality of modulation schemes, e.g., FSK, PSK or QAM.In another embodiment, a signal is classified as being speech or voiceband data. This is achieved by employing a phase relationship, i.e., the sign, of the autocorrelation of a complex low-pass version of the signal and the normalized variance. If the autocorrelation has a prescribed phase or the normalized variance is greater than a predetermined value the signal is speech, otherwise it is voiceband data.

摘要翻译： 通过采用信号的复杂低通版本的绝对力矩之间的规定关系，信号被分类为多个分类中的一个。 具体地说，规定的关系与由第一阶矩平方化归一化的复合低通版本的大小的二阶矩相关。 这导致所谓的归一化方差，其与预定阈值进行比较，以将信号分类为具有多个调制方案中的一种，例如FSK，PSK或QAM。 在另一个实施例中，信号被分类为语音或话音频带数据。 这通过采用信号的复合低通版本和归一化方差的自相关的相位关系即符号来实现。 如果自相关具有规定的相位或归一化方差大于预定值，则信号是语音，否则是语音带数据。