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公开(公告)号：US5418817A
公开(公告)日：1995-05-23
申请号：US26319
申请日：1993-03-03
申请人： Gerard Richter
发明人： Gerard Richter
CPC分类号： H04L25/0305
摘要： Adaptive equalization system for allowing the equalization of a base-band line of a DCE, includes an adaptive filter for adjusting its coefficients in accordance with an adaptive algorithm. The equalizer includes controls to work during a preliminary period, in an adaptive or non-adaptive mode according to the convergence of the recursive algorithm process. The algorithm is triggered depending on whether the equalized signal belongs to one of several predefined intervals of convergence. After this preliminary period, when the mean square of the residual error is considered small enough to ensure the convergence of the adaptive process, the algorithm is computed on a continuous mode.
摘要翻译： 用于允许DCE的基带线路的均衡的自适应均衡系统包括用于根据自适应算法来调整其系数的自适应滤波器。 均衡器包括根据递归算法进程的收敛在自适应或非自适应模式下在初步期间工作的控制。 根据均衡信号是否属于几个预定义的收敛间隔之一来触发该算法。 在这个初步阶段之后，当剩余误差的均方根被认为足够小以确保自适应过程的收敛时，算法在连续模式下计算。
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32.发明授权
公开(公告)号：US5210774A
公开(公告)日：1993-05-11
申请号：US774496
申请日：1991-10-10
CPC分类号： H03H21/0012 , H04L25/0305
摘要： An adaptive equalization system for allowing the equalization of a base-band line of a DCE within a predetermined range, includes an adaptive equalizer for continuously adapting its coefficients in accordance with a predetermined adaptive algorithm. The equalizer includes storage for a plurality of sets of initial coefficients for the equalization process corresponding to a plurality of telecommunication line characteristics and circuits for estimating the energy of the received signal. From the estimation of the energy of the signal on the line, there is derived one set among the plurality of sets of initial coefficients which are then used for setting the equalization before initiating the convergence process. An efficient and very simple equalization process is therefore provided which is ensured to converge whatever the characteristics of the line within the considered range.
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33.发明授权Automatic channel equalization apparatus with data equalization mode adaptor 失效具有数据均衡模式适配器的自动通道均衡装置
公开(公告)号：US3671672A
公开(公告)日：1972-06-20
申请号：US3671672D
申请日：1971-02-18
申请人： US AIR FORCE
发明人： SULLIVAN HAROLD G
CPC分类号： H04L25/0305
摘要： Apparatus for automatically equalizing a data channel while data is being transmitted therethrough. This is accomplished by using the data itself, which is randomized, to adjust the receiving apparatus to reduce or eliminate the degrading effects of channel induced inter-symbol interference upon the reception of multilevel pulse amplitude or pulse mode modulation. High data transmission rates are achieved by switching to a data equalization mode of operation following a training period in the conventional system probe equalization mode.
摘要翻译： 用于在数据通过其传输时自动均衡数据信道的装置。 这是通过使用随机化的数据本身来实现的，以调整接收装置以减少或消除在接收多电平脉冲幅度或脉冲模式调制时信道感应的符号间干扰的降级效应。
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公开(公告)号：US3479458A
公开(公告)日：1969-11-18
申请号：US3479458D
申请日：1967-03-06
申请人： HONEYWELL INC
发明人： LORD JOHN B , LYTLE DEAN W
CPC分类号： H04L25/0305
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公开(公告)号：US20240259145A1
公开(公告)日：2024-08-01
申请号：US18462863
申请日：2023-09-07
申请人： Skywave Networks LLC
发明人： Kevin J. Babich
CPC分类号： H04L1/205 , H04L25/0305
摘要： A method for equalizing a wireless communication channel includes transmitting a data signal over a primary channel. During transmission of the data signal, a corresponding data signal is sent over a secondary channel. The information received from the secondary channel is compared to the information received from the primary channel and differences between the information received from each of the channels are observed. These differences are used as inputs to an equalizer algorithm that may be used to reduce distortion of the data signal sent over the primary channel.
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公开(公告)号：US20190081830A1
公开(公告)日：2019-03-14
申请号：US16178052
申请日：2018-11-01
CPC分类号： H04L27/01 , H04L5/0007 , H04L5/0076 , H04L25/0305 , H04L25/03159 , H04L27/2602 , H04L27/2607 , H04L27/2636
摘要： A method and apparatus for equalization in a communication system. The method includes receiving an input of a block of symbols, filtering the input in the frequency domain, calculating an error factor in the time domain based on the filtered input, updating tap weights of the equalizer in the frequency domain using circular correlation based on the error factor and the conjugate of the input in the frequency domain, and outputting the filtered input.
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公开(公告)号：US09197456B2
公开(公告)日：2015-11-24
申请号：US14527206
申请日：2014-10-29
申请人： FINISAR CORPORATION
CPC分类号： H04L25/0307 , H04B10/0795 , H04L25/03019 , H04L25/03038 , H04L25/03044 , H04L25/0305 , H04L25/03057 , H04L25/03133 , H04L25/03885 , H04L27/01 , H04L2025/0349 , H04L2025/03509 , H04L2025/03668 , H04Q2011/0083
摘要： A method of blind tap coefficient adaptation includes receiving a digital data signal including random digital data, equalizing a first portion of the digital data signal using a first set of predetermined tap coefficients and a second portion of the digital data signal using a second set of predetermined tap coefficients. The method includes generating a first eye diagram and a second eye diagram from a first portion and a second portion of an equalized signal, respectively. The first eye diagram is compared with the second eye diagram to determine which of the sets of predetermined tap coefficients results in a data signal having a higher signal quality. The method includes inputting to an equalizer as an initial set of tap coefficients the first set of predetermined tap coefficients or the second set of predetermined tap coefficients according to the determination.
摘要翻译： 盲抽头系数适配的方法包括：接收包括随机数字数据的数字数据信号，使用第一组预定抽头系数对数字数据信号的第一部分进行均衡，以及使用第二组预定的抽头系数的数字数据信号的第二部分 抽头系数。 该方法包括分别从均衡信号的第一部分和第二部分生成第一眼图和第二眼图。 将第一眼图与第二眼图进行比较，以确定预定抽头系数中的哪一组导致具有较高信号质量的数据信号。 该方法包括根据该确定，将均衡器作为初始抽头系数集合输入第一组预定抽头系数或第二组预定抽头系数。
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公开(公告)号：US08982940B2
公开(公告)日：2015-03-17
申请号：US13868623
申请日：2013-04-23
发明人： Rui Lv
CPC分类号： H04L25/03885 , H04L25/0305 , H04L27/22 , H04L27/38 , H04L2025/0342 , H04L2025/03477 , H04L2025/03598 , H04L2025/03662 , H04L2025/037
摘要： The present disclosure relates to the field of network communication, and specifically discloses an adaptive equalization method, including: obtaining a first filtered signal according to a first filter coefficient; deciding the first filtered signal based on an original constellation map to obtain a first decision signal, and deciding the first filtered signal based on a level (n−1) constellation map to obtain a level (n−1) pseudo decision signal; if average energy of the level (n−1) error signal is less than a level (n−1) threshold, switching the level (n−1) constellation map to a level n constellation map; obtaining a second filter coefficient according to the update magnitude; obtaining a second filtered signal according to the second filter coefficient; and deciding the second filtered signal based on the original constellation map to obtain a second decision signal. Embodiments of the present disclosure also disclose an adaptive equalizer.
摘要翻译： 本公开涉及网络通信领域，具体公开了一种自适应均衡方法，包括：根据第一滤波器系数获得第一滤波信号; 基于原始星座图确定第一滤波信号以获得第一判定信号，并且基于级别（n-1）星座图确定第一滤波信号以获得电平（n-1）伪判定信号; 如果电平（n-1）误差信号的平均能量小于电平（n-1）阈值，则将电平（n-1）星座图切换到等级n星座图; 根据更新幅度获得第二滤波器系数; 根据第二滤波器系数获得第二滤波信号; 以及基于原始星座图确定第二滤波信号以获得第二判定信号。 本公开的实施例还公开了自适应均衡器。
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公开(公告)号：US08699167B2
公开(公告)日：2014-04-15
申请号：US13310028
申请日：2011-12-02
申请人： Haitao Xia , Weijun Tan , Nenad Miladinovic , Shaohua Yang
发明人： Haitao Xia , Weijun Tan , Nenad Miladinovic , Shaohua Yang
CPC分类号： H04L25/03254 , H04L25/0305
摘要： Various embodiments of the present invention provide systems and methods for data processing. As an example, a data processing circuit is disclosed that includes an equalizer circuit and a data detection circuit. The equalizer circuit is operable to filter a series of samples based at least in part on a filter coefficient and to provide a corresponding series of filtered samples. The data detection circuit includes: a core data detector circuit and a coefficient determination circuit. The core data detector circuit is operable to perform a data detection process on the series of filtered samples and to provide a most likely path and a next most likely path. The coefficient determination circuit operable to update the filter coefficient based at least in part on the most likely path and the next most likely path.
摘要翻译： 本发明的各种实施例提供了用于数据处理的系统和方法。 作为示例，公开了包括均衡器电路和数据检测电路的数据处理电路。 均衡器电路可操作以至少部分地基于滤波器系数对一系列样本进行滤波，并提供相应的一系列滤波样本。 数据检测电路包括：核心数据检测器电路和系数确定电路。 核心数据检测器电路可操作以对一系列经滤波的样本执行数据检测处理，并提供最可能的路径和下一个最可能的路径。 系数确定电路可操作以至少部分地基于最可能的路径和下一个最可能的路径来更新滤波器系数。
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公开(公告)号：US20130301697A1
公开(公告)日：2013-11-14
申请号：US13467394
申请日：2012-05-09
申请人： Daniel N. Liu , Michael P. Fitz
发明人： Daniel N. Liu , Michael P. Fitz
IPC分类号： H04L27/01
CPC分类号： H04L25/0305 , H04L25/03038 , H04L2025/03407 , H04L2025/0342 , H04L2025/03636
摘要： A blind equalizer apparatus includes a decision-directed (DD) least mean squares (LMS) blind equalizer. A blind equalizer apparatus includes: a DD LMS blind equalizer, wherein: the blind equalizer uses a finite impulse response filter with tap weights that are adaptively updated using a filter tap update algorithm, wherein blind equalization of one of an in-phase (I) channel and a quadrature (Q) channel is carried out by maximizing the Euclidean distance of binary modulated waveforms, wherein the blind equalizer averages a block to compute an independent phase estimate for a block, wherein the blind equalizer computes an error variable for a block from the phase estimate for the block, wherein the blind equalizer uses the phase estimate and alternating I/Q one dimensional/binary slicing to make a hard decision, and wherein the blind equalizer uses the hard decision to derive an error variable that is used to update the filter tap weights.
摘要翻译： 盲均衡器装置包括决策导向（DD）最小均方（LMS）盲均衡器。 盲均衡器装置包括：DD LMS盲均衡器，其中：盲均衡器使用具有抽头权重的有限脉冲响应滤波器，使用滤波器抽头更新算法自适应地更新，其中，同步（I） 通过最大化二进制调制波形的欧几里得距离来执行正交（Q）信道，其中盲均衡器对块进行平均以计算块的独立相位估计，其中盲均衡器计算块的误差变量 所述盲均衡器使用所述相位估计和交替I / Q一维/二进制切片作出硬判决，并且其中所述盲均衡器使用所述硬判决来导出用于更新的误差变量 过滤器抽头重量。
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