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1. 发明申请

US20050089089A1 System and method for selecting precursor equalizer coefficients and serializer deserializer incorporating the same 有权
标题翻译：用于选择前体均衡器系数的系统和方法以及包含其的串行器解串器
公开(公告)号：US20050089089A1
公开(公告)日：2005-04-28
申请号：US10833904
申请日：2004-04-28
申请人： Kofi Anim-Appiah , Nirmal Warke , Song Wu
发明人： Kofi Anim-Appiah , Nirmal Warke , Song Wu
IPC分类号： H03H7/30 , H03K5/159 , H04L25/03
CPC分类号： H04L25/03343 , H04L2025/03356 , H04L2025/0349 , H04L2025/03611
摘要： In one aspect, the present invention provides a system and method for selecting precursor equalizer coefficients and a serializer deserializer (SERDES) incorporating the system or the method. In one embodiment, the system includes: (1) a cost definer configured to generate an eye height cost function based on continuous-time channel and crosstalk symbol responses pertaining to a particular serial link and (2) a cost evaluator associated with the cost definer and configured to evaluate the eye height cost function based on a particular criterion thereby to produce coefficients for a precursor equalizer to be applied with respect to the particular serial link.
摘要翻译：一方面，本发明提供一种用于选择前体均衡器系数的系统和方法以及包含该系统或方法的串行器解串器（SERDES）。在一个实施例中，系统包括：（1）成本定义器，其被配置为基于与特定串行链路有关的连续时间信道和串扰符号响应来生成眼睛高度成本函数，以及（2）与成本定义器相关联的成本评估器并且被配置为基于特定标准来评估眼睛高度成本函数，从而产生用于相对于特定串行链路应用的前体均衡器的系数。

2. 发明申请

US20070174375A1 Method and system for selecting effective tap values for a digital filter 有权
标题翻译：用于选择数字滤波器的有效抽头值的方法和系统
公开(公告)号：US20070174375A1
公开(公告)日：2007-07-26
申请号：US11338570
申请日：2006-01-24
申请人： Kofi Anim-Appiah , Nirmal Warke
发明人： Kofi Anim-Appiah , Nirmal Warke
IPC分类号： G06F17/10
CPC分类号： H03H17/0294
摘要： Systems and methods are provided for determining effective tap values for a digital filter. A first plurality of vectors is generated, wherein each of the first plurality of vectors represents a set of tap values for the filter at a first resolution. A best vector is selected from the first plurality of vectors according to a first performance metric. A second plurality of vectors is generated within a threshold distance of the selected best vector, wherein each of the second plurality of vectors represents a set of tap values for the filter at a second resolution that is superior to the first resolution. A best vector is selected from the second plurality of vectors according to a second performance metric.
摘要翻译：提供了用于确定数字滤波器的有效抽头值的系统和方法。生成第一多个向量，其中第一多个向量中的每一个向量表示第一分辨率下的滤波器的抽头值集合。根据第一性能度量从第一多个向量中选择最佳向量。在所选择的最佳向量的阈值距离内生成第二多个向量，其中第二多个向量中的每一个向量表示在比第一分辨率优于第二分辨率的滤波器的抽头值集合。根据第二性能度量从第二多个向量中选择最佳向量。

3. 发明申请

US20050243941A1 M-dimension M-PAM trellis code system and associated trellis encoder and decoder 有权
标题翻译： M维M-PAM网格码系统和相关网格编码器和解码器
公开(公告)号：US20050243941A1
公开(公告)日：2005-11-03
申请号：US10835439
申请日：2004-04-29
申请人： Kofi Anim-Appiah , Nirmal Warke
发明人： Kofi Anim-Appiah , Nirmal Warke
IPC分类号： H03M13/25 , H04L1/00 , H04L5/12 , H04L25/49
CPC分类号： H03M13/25 , H03M13/256 , H04L1/0041 , H04L1/0054 , H04L1/006 , H04L25/4919
摘要： An M-dimension M-PAM trellis code encoder, a method of encoding user bits and a decoder. In one embodiment, the encoder includes: (1) a convolutional encoder portion configured to encode at least two user bits into at least three coded bits and (2) a sublattice selector coupled to the convolutional encoder portion and configured to employ the at least three coded bits to select a particular sublattice of code alphabet elements and further to employ at least two additional user bits to select a particular code alphabet element in the sublattice.
摘要翻译： M维M-PAM网格码编码器，编码用户比特的方法和解码器。在一个实施例中，编码器包括：（1）卷积编码器部分，被配置为将至少两个用户比特编码为至少三个编码比特，以及（2）耦合到卷积编码器部分并被配置为使用至少三个编码比特以选择特定的码字母元素的子格子，并且还使用至少两个附加用户比特来选择子格子中的特定代码字母表元素。

4. 发明授权

US06965638B2 Increasing performance in modems in presence of noise 有权
标题翻译：在存在噪声的情况下，增加调制解调器的性能
公开(公告)号：US06965638B2
公开(公告)日：2005-11-15
申请号：US09953040
申请日：2001-09-12
申请人： Nirmal Warke
发明人： Nirmal Warke
IPC分类号： H04L27/26 , H04B1/38 , H04L5/16
CPC分类号： H04L27/2647
摘要： A digital communications system with a built-in apparatus for improving receive path performance in the presence of noise. An analog datastream is provided to a hardware receive filter that rejects signals lying outside a frequency spectrum of interest, while a hardware equalizer flattens the channel response. An analog-to-digital converter digitizes the filtered and equalized analog datastream into a digital bitstream, which is then filtered, further channel-equalized and demodulated. The system also includes a memory, an estimator unit, having a first input coupled to the memory and a second input coupled to a data input, and an output coupled to a compute unit. The estimator unit is adapted to providing estimates of signal power, channel noise and channel response. The compute unit, has an input coupled the estimator unit and an output coupled to the memory, and is adapted to computing a channel capacity based the selected combination of modem parameters.
摘要翻译：一种具有内置设备的数字通信系统，用于在存在噪声的情况下改善接收路径性能。模拟数据流被提供给硬件接收滤波器，其拒绝位于感兴趣的频谱之外的信号，而硬件均衡器使通道响应变宽。模数转换器将滤波和均衡的模拟数据流数字化为数字比特流，然后将其滤波，进一步进行信道均衡和解调。该系统还包括存储器，估计器单元，其具有耦合到存储器的第一输入和耦合到数据输入的第二输入以及耦合到计算单元的输出。估计器单元适于提供信号功率，信道噪声和信道响应的估计。计算单元具有耦合估计器单元和耦合到存储器的输出的输入，并且适于基于所选择的调制解调器参数的组合来计算信道容量。

5. 发明授权

US06566889B2 Line diagnostics for wireline modems 有权
公开(公告)号：US06566889B2
公开(公告)日：2003-05-20
申请号：US09947009
申请日：2001-09-04
申请人： Nirmal Warke
发明人： Nirmal Warke
IPC分类号： G01R3108
CPC分类号： H04M3/30 , H04L1/20
摘要： A modem with built-in transmission line diagnostic capability is presented. Said built-in line diagnostics are capable of determining said transmission line's length and detecting the presence of any bridge taps. Said built-in diagnostics have an advantage of not requiring any specialized or expensive hardware and can be added to an existing modem without significant redesign work.

6. 发明授权

US08526532B2 Transmitter with dynamic equalizer 有权
标题翻译：带动态均衡器的变送器
公开(公告)号：US08526532B2
公开(公告)日：2013-09-03
申请号：US13017959
申请日：2011-01-31
申请人： Kian Haur Chong , Nirmal Warke
发明人： Kian Haur Chong , Nirmal Warke
IPC分类号： H04L25/03 , H03K5/159
CPC分类号： H04L25/03885 , H04L25/03343
摘要： A method for filtering a signal having a series of symbols to be transmitted using the default coefficients, detecting occurrence of a series of consecutive common symbols followed by a different symbol in the series of symbols and based on detecting the occurrence, changing from the default coefficients to a second set of coefficients.
摘要翻译：一种用于使用默认系数对具有要发送的一系列符号的信号进行滤波的方法，检测在一系列符号中随后是不同符号的一系列连续公共符号的发生，并且基于检测出现，从默认系数到第二组系数。

7. 发明授权

US07190665B2 Blind crosstalk cancellation for multicarrier modulation 有权
标题翻译：用于多载波调制的盲目串扰消除
公开(公告)号：US07190665B2
公开(公告)日：2007-03-13
申请号：US10126150
申请日：2002-04-19
申请人： Nirmal Warke , Nadeem Ahmed
发明人： Nirmal Warke , Nadeem Ahmed
IPC分类号： H04J1/12
CPC分类号： H04B3/32
摘要： Crosstalk can be cancelled in a composite communication signal (ym) which includes a primary signal component associated with communication data and which also includes a crosstalk signal component produced by applying a crosstalk coupling function to crosstalk data. An estimate (R, RCb(0), RCb(Δf)AVG) of a statistical characteristic of the crosstalk signal component is obtained from the composite communication signal. A cancellation signal (26, 46) is generated based on the statistical characteristic estimate, and an estimate (29) of the communication data is produced based on the composite communication signal and the cancellation signal.
摘要翻译：可以在包括与通信数据相关联的主信号分量的复合通信信号（> m）中消除串扰，并且还包括通过将串扰耦合功能应用于串扰数据而产生的串扰信号分量。统计学的估计值（R，R C B（0），R C B（Δ），AVG）从复合通信信号获得串扰信号分量的特性。基于统计特性估计产生消除信号（26,46），并且基于复合通信信号和消除信号产生通信数据的估计（29）。

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