公开(公告)号：US06834079B1

公开(公告)日：2004-12-21

申请号：US09693498

申请日：2000-10-20

申请人： Jeffrey C. Strait ,  Eugene T. Sy

发明人： Jeffrey C. Strait ,  Eugene T. Sy

IPC分类号： H03H730

CPC分类号： H04L25/03012 ,  H04L2025/03414

摘要： A system and method for minimizing the effective channel impulse response in multitone communication systems, is provided. A time domain equalizer is utilized to shorten the channel impulse response to a length equal to or less than the time duration of the cyclic prefix. The time domain equalizer includes an adaptable filter with updateable coefficients. The updateable coefficients are calculated in a storage efficient manner to effectively estimate a desirable channel response. Processing of the time domain equalizer signal improves the symbol boundary estimate and effectively reduces the effect of noise of the updateable coefficient solution.

摘要翻译： 提供了一种用于最小化多音通信系统中的有效信道脉冲响应的系统和方法。 使用时域均衡器将信道脉冲响应缩短到等于或小于循环前缀的持续时间的长度。 时域均衡器包括具有可更新系数的适应滤波器。 可更新系数以存储有效的方式计算，以有效地估计期望的信道响应。 时域均衡器信号的处理提高了符号边界估计，有效降低了可更新系数解的噪声影响。

公开(公告)号：US06608864B1

公开(公告)日：2003-08-19

申请号：US09320258

申请日：1999-05-26

申请人： Jeffrey C. Strait

发明人： Jeffrey C. Strait

IPC分类号： H04L2701

CPC分类号： H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03522 ,  H04L2025/03617 ,  H04L2025/03687

摘要： A method and apparatus for frequency domain equalization. The method and apparatus are particularly well suited for use in a receiver in a multicarrier transmission system that has predetermined symbols periodically embedded in the transmissions, such as in an ADSL system. The equalizer apparatus includes a digital filter having a plurality of single-tap filters. The filters operate on the symbols in the frequency domain, accepting frequency domain representations of the received symbols. The equalizer also includes a reference symbol generator that provides reference symbols, a coefficient generator that accepts the equalized frequency domain symbols from the digital filter and the reference symbols and updates the filter taps using a received predetermined symbol and the reference symbol. The coefficient generator includes a generator filter having a first and a second adaptation increment, an error generator, and a threshold detector that controls the coefficient generator in response to said error signal. Preferably, the threshold detector determines whether the equalizer output would have been decoded improperly during a synchronization symbol, and if so, enables the use of the second update increment in the generator filter.

摘要翻译： 一种用于频域均衡的方法和装置。 该方法和装置特别适用于具有周期性地嵌入在传输中的预定符号的多载波传输系统中的接收机中，例如在ADSL系统中。 均衡器装置包括具有多个单抽头滤波器的数字滤波器。 滤波器对频域中的符号进行操作，接收接收符号的频域表示。 均衡器还包括提供参考符号的参考符号发生器，接收来自数字滤波器和参考符号的均衡频域符号的系数发生器，并且使用接收到的预定符号和参考符号来更新滤波器抽头。 系数发生器包括具有第一和第二自适应增量的发生器滤波器，误差发生器和响应于所述误差信号控制系数发生器的阈值检测器。 优选地，阈值检测器确定均衡器输出是否在同步符号期间被不正确地解码，并且如果是，则使能在生成器滤波器中使用第二更新增量。

公开(公告)号：US06266367B1

公开(公告)日：2001-07-24

申请号：US09086395

申请日：1998-05-28

申请人： Jeffrey C. Strait

发明人： Jeffrey C. Strait

IPC分类号： H03H730

CPC分类号： H03H21/0012

摘要： A method and structure that reduces the computational requirements of both echo cancellation and time domain equalization in symmetrical transceivers. The structure exploits pole-zero modeling of both the echo and transmission path response in order to realize an improved level of system performance with shorter filters than would be required with direct FIR modeling.

摘要翻译： 减少对称收发器中回波消除和时域均衡的计算要求的方法和结构。 该结构利用了回波和传输路径响应的极零建模，以便通过使用简单的FIR滤波器实现系统性能的提高，而不需要直接的FIR建模。