公开(公告)号：US20110193732A1

公开(公告)日：2011-08-11

申请号：US13032407

申请日：2011-02-22

申请人： Charles Kasimer Sestok ,  Fernando Alberto Mujica

发明人： Charles Kasimer Sestok ,  Fernando Alberto Mujica

IPC分类号： H03M1/06

CPC分类号： H03M1/1061 ,  H03M1/1215

摘要： With high speed, high resolution time-interleaved (TI) analog-to-digital converters (ADCs), bandwidth mismatches between the various ADC branches can pose a significant problem. Previously, though, no adequate solution has been found. Here, a method and apparatus are provided that can calculate and compensate for bandwidth mismatches in a TI ADC, enabling a high speed, high resolution TI ADC to be produced.

摘要翻译： 采用高速，高分辨率时间交错（TI）模数转换器（ADC），各种ADC分支之间的带宽不匹配可能会造成重大问题。 以前，虽然没有找到足够的解决方案。 这里提供了一种方法和装置，可以计算和补偿TI ADC中的带宽不匹配，从而实现高速，高分辨率TI ADC的生产。

公开(公告)号：US07751494B2

公开(公告)日：2010-07-06

申请号：US11810481

申请日：2007-06-05

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica

IPC分类号： H04B7/02

CPC分类号： H04B7/0417 ,  H04B7/0478 ,  H04L1/06

摘要： A method of determining indicators for matrix codewords in a matrix codeword codebook, where the matrix codewords are adapted for communicating information between a transmitter and a receiver. The method includes providing a lookup table that is associated with multiple codewords that are associated with a codebook. The lookup table has m rows, and each row in the lookup table has a one-to-one correspondence with a codeword in the multiple codewords. Each row has p entries and each of the p entries holds a codeword indicator that identifies a codeword in the multiple codewords. The (i,j)th entry in the lookup table holds the codeword indicator identifying the jth most similar codeword to the codeword associated with the ith row according to a similarity metric, where 1≦i≦m and 1≦j≦p, and the m rows include a row k. The method includes identifying a first indicator in the row k by testing each of the indicators in the first p entries of row k to determine which of the indicators in the first n entries identifies a reduced search codeword that best satisfies a selection criterion, wherein, n has a predetermined value and 1≦n≦p, and, in relation to the other remaining indicators in the first n entries of the first row, the first indicator identifies the reduced search codeword that best satisfies the selection criterion.

摘要翻译： 一种确定矩阵码字码本中的矩阵码字的指示符的方法，其中矩阵码字适于在发射机和接收机之间传送信息。 该方法包括提供与与码本相关联的多个码字相关联的查找表。 查找表具有m行，并且查找表中的每一行与多个码字中的码字具有一一对应关系。 每行具有p个条目，并且p个条目中的每一个保存用于标识多个码字中的码字的码字指示符。 查找表中的（i，j）条目将代码字指示符根据相似性度量将识别与第i行相关联的第j个最相似码字的码字标识，其中1＆nlE; i＆nlE; m和1＆nlE; j＆nlE; p和 m行包括行k。 该方法包括通过测试行k的第一p个条目中的每个指示符来确定行n中的哪个指示符来识别最佳地满足选择标准的缩减搜索码字来识别行k中的第一指示符，其中， n具有预定值和1＆nlE; n＆nlE; p，并且关于第一行的前n个条目中的其他剩余指示符，第一指示符标识最符合选择标准的缩减搜索码字。

公开(公告)号：US07733177B1

公开(公告)日：2010-06-08

申请号：US12333061

申请日：2008-12-11

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Gregory Copeland

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Gregory Copeland

IPC分类号： H03F1/26

CPC分类号： H03F1/3241

摘要： An apparatus is provided to determine pre-distortion for a nonlinear system. The apparatus comprises a datapath and a power amplifier. The datapath employs predistortion data to generally linearized the power amplifier. To generate this predistortion data, an indirect learning circuit and a direct learning circuit can be employed. The indirect learning circuit is generally coupled to the amplifier circuit so that it can iteratively adjust predistortion data during an indirect learning mode until convergence is reached. The direct learning circuit is generally coupled to the amplifier circuit and the indirect learning circuit and that receives the input signal so that the predistortion data can be copied to the direct learning circuit from the indirect learning after convergence is reached and so that the direct learning circuit can adjust the predistortion data during a direct learning mode.

摘要翻译： 提供了一种用于确定非线性系统的预失真的装置。 该装置包括数据路径和功率放大器。 数据通路采用预失真数据，通常将功率放大器线性化。 为了产生该预失真数据，可以采用间接学习电路和直接学习电路。 间接学习电路通常耦合到放大器电路，使得其可以在间接学习模式期间迭代地调整预失真数据直到达到收敛。 直接学习电路通常耦合到放大器电路和间接学习电路，并且接收输入信号，使得预失真数据可以在达到收敛之后从间接学习中复制到直接学习电路，并且直接学习电路 可以在直接学习模式下调整预失真数据。

公开(公告)号：US08218676B2

公开(公告)日：2012-07-10

申请号：US12342269

申请日：2008-12-23

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Seydou Nourou Ba

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Seydou Nourou Ba

IPC分类号： H04K1/02

CPC分类号： H03F1/3247 ,  H03F3/19 ,  H03F3/245 ,  H03F2201/3233

摘要： A circuit for use with an amplification circuit having a predistortion datapath portion, a power amplifier portion and a gain portion. The predistortion datapath portion can output a predistorted signal based on the input signal. The power amplifier portion can output an amplified signal based on the predistorted signal. The gain portion can output a gain output signal based on the amplified signal. The circuit comprises a digital predistortion adaptation portion and a combiner. The digital predistortion adaptation portion can output a predistortion adaptation portion output signal. The combiner can output an error signal. The predistortion adaptation portion output signal is based on the input signal, the gain output signal and the error signal. The error signal is based on the difference between the predistorted signal and the predistortion adaptation portion output signal.

摘要翻译： 一种与具有预失真数据路径部分，功率放大器部分和增益部分的放大电路一起使用的电路。 预失真数据路径部分可以基于输入信号输出预失真信号。 功率放大器部分可以基于预失真信号输出放大的信号。 增益部分可以基于放大的信号输出增益输出信号。 该电路包括数字预失真适配部分和组合器。 数字预失真适配部分可以输出预失真调整部分输出信号。 组合器可以输出错误信号。 预失真适配部分输出信号基于输入信号，增益输出信号和误差信号。 误差信号基于预失真信号和预失真适配部分输出信号之间的差异。

公开(公告)号：US20110080309A1

公开(公告)日：2011-04-07

申请号：US12572831

申请日：2009-10-02

申请人： Charles Kasimer Sestok ,  Fernando Alberto Mujica

发明人： Charles Kasimer Sestok ,  Fernando Alberto Mujica

IPC分类号： H03M1/06 ,  H03M1/12 ,  H03M1/00

CPC分类号： H03M1/1061 ,  H03M1/1215

摘要： With high speed, high resolution time-interleaved (TI) analog-to-digital converters (ADCs), bandwidth mismatches between the various ADC branches can pose a significant problem. Previously, though, no adequate solution has been found. Here, a method and apparatus are provided that can calculate and compensate for bandwidth mismatches in a TI ADC, enabling a high speed, high resolution TI ADC to be produced.

摘要翻译： 采用高速，高分辨率时间交错（TI）模数转换器（ADC），各种ADC分支之间的带宽不匹配可能会造成重大问题。 以前，虽然没有找到足够的解决方案。 这里提供了一种方法和装置，可以计算和补偿TI ADC中的带宽不匹配，从而实现高速，高分辨率TI ADC的生产。

公开(公告)号：US20100158155A1

公开(公告)日：2010-06-24

申请号：US12342269

申请日：2008-12-23

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Seydou Nourou Ba

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Seydou Nourou Ba

IPC分类号： H04L25/03 ,  H03F1/32

CPC分类号： H03F1/3247 ,  H03F3/19 ,  H03F3/245 ,  H03F2201/3233

摘要： A circuit for use with an amplification circuit having a predistortion datapath portion, a power amplifier portion and a gain portion. The predistortion datapath portion can output a predistorted signal based on the input signal. The power amplifier portion can output an amplified signal based on the predistorted signal. The gain portion can output a gain output signal based on the amplified signal. The circuit comprises a digital predistortion adaptation portion and a combiner. The digital predistortion adaptation portion can output a predistortion adaptation portion output signal. The combiner can output an error signal. The predistortion adaptation portion output signal is based on the input signal, the gain output signal and the error signal. The error signal is based on the difference between the predistorted signal and the predistortion adaptation portion output signal.

摘要翻译： 一种与具有预失真数据路径部分，功率放大器部分和增益部分的放大电路一起使用的电路。 预失真数据路径部分可以基于输入信号输出预失真信号。 功率放大器部分可以基于预失真信号输出放大的信号。 增益部分可以基于放大的信号输出增益输出信号。 该电路包括数字预失真适配部分和组合器。 数字预失真适配部分可以输出预失真调整部分输出信号。 组合器可以输出错误信号。 预失真适配部分输出信号基于输入信号，增益输出信号和误差信号。 误差信号基于预失真信号和预失真适配部分输出信号之间的差异。

公开(公告)号：US20120066162A1

公开(公告)日：2012-03-15

申请号：US12878817

申请日：2010-09-09

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica

IPC分类号： G06F15/18 ,  G06F17/14 ,  G06F17/10

CPC分类号： H03H21/0025 ,  H03H21/0012

摘要： The adaptive filtering techniques described herein allow a filter that is operating in a target domain to be trained in another domain, possibly with constraints, using the same adaptation framework used in a standard adaptive filter. As a result, the adaptation engine may be configured to run in a transform domain that is more desirable than the target domain. For example, the transform domain may be less susceptible to noise or may have more impact on the trained filter's desired results. The filter is trained in the transform domain and then the filter hardware is updated in the target domain.

摘要翻译： 本文描述的自适应滤波技术允许使用标准自适应滤波器中使用的相同的自适应框架，在目标域中操作的滤波器在另一个域中可能受到约束。 因此，适配引擎可以被配置为在比目标域更理想的变换域中运行。 例如，变换域可能不太容易受噪声影响，或者可能对训练过的滤波器的期望结果产生更大的影响。 过滤器在变换域中进行训练，然后在目标域中更新过滤器硬件。

公开(公告)号：US07769098B2

公开(公告)日：2010-08-03

申请号：US11810512

申请日：2007-06-05

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica

IPC分类号： H04B7/02

CPC分类号： H04L25/0204 ,  H04B7/0434 ,  H04B7/0478 ,  H04B7/0639 ,  H04B7/0848 ,  H04L1/0045 ,  H04L1/0625 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0041 ,  H04L25/0246 ,  H04L25/0248

摘要： A method of determining indices for matrix codewords in a matrix codeword codebook. The matrix codewords are adapted for communicating information between a transmitter and a receiver. The method includes retrieving from temporary storage, an eigenmode representation for a communications channel, where the eigenmode representation is based upon on a received signal precoded by a first matrix codeword. The method also includes performing a test on multiple vector codewords to identify a first vector codeword among the multiple vector codewords, where the test includes determining a relationship between the first vector codeword and the representation of an eigenmode. The first vector codeword is associated with a first vector codeword index that identifies the first vector codeword. The method also includes generating a matrix codeword index associated with a second matrix codeword in the matrix codeword codebook. The matrix codeword index is based upon the first vector codeword index, and the order of the first vector codeword is different from the order of the second matrix codeword.

摘要翻译： 一种确定矩阵码字码本中矩阵码字的索引的方法。 矩阵码字适于在发射机和接收机之间传送信息。 该方法包括从临时存储器中检索通信信道的本征模式表示，其中本征模式表示基于由第一矩阵码字预编码的接收信号。 该方法还包括对多个向量码字执行测试以识别多个向量码字中的第一向量码字，其中测试包括确定第一向量码字和本征模式的表示之间的关系。 第一矢量码字与识别第一矢量码字的第一矢量码字索引相关联。 该方法还包括生成与矩阵码字码本中的第二矩阵码字相关联的矩阵码字索引。 矩阵码字索引基于第一矢量码字索引，第一矢量码字的顺序与第二矩阵码字的顺序不同。

公开(公告)号：US20110080216A1

公开(公告)日：2011-04-07

申请号：US12571435

申请日：2009-10-01

申请人： FERNANDO ALBERTO MUJICA ,  HARDIK PRAKASH GANDHI ,  LEI DING ,  MILIND BORKAR ,  ZIGANG YANG ,  ROLAND SPERLICH ,  LARS MORTEN JORGENSEN ,  WILLIAM L. ABBOTT

发明人： FERNANDO ALBERTO MUJICA ,  HARDIK PRAKASH GANDHI ,  LEI DING ,  MILIND BORKAR ,  ZIGANG YANG ,  ROLAND SPERLICH ,  LARS MORTEN JORGENSEN ,  WILLIAM L. ABBOTT

IPC分类号： H03F1/26

CPC分类号： H03F1/3258 ,  H03F1/3247 ,  H03F1/3294 ,  H03F3/195 ,  H03F3/24 ,  H03F2200/336 ,  H04L27/368

摘要： Systems and methods for power amplifier pre-distortion are provided. The systems and methods of power amplifier digital pre-distortion disclosed herein may include a generic pre-distorter architecture which can implement a variety of Volterra cross terms involving single dimension convolutions (first order dynamics). For hardware implementations, this generic pre-distorter is further fine-tuned to provide a choice between different sets of cross terms that can be selected for a given PA for optimal performance. The novel pre-distorter architecture provides flexibility to trade off memory depth for additional Volterra terms and vice versa. A further novelty is the ability to trade off both memory depth and cross terms for a higher sample rate operation, which may enable higher order non-linear pre-distortion, or support for higher signal bandwidths. A poly-phase non-linear filtering mode allows for this flexibility.

摘要翻译： 提供了功率放大器预失真的系统和方法。 本文公开的功率放大器数字预失真的系统和方法可以包括通用预失真器架构，其可以实现涉及单维卷积（一阶动力学）的各种Volterra交叉项。 对于硬件实现，该通用预失真器进一步被微调，以提供可以为给定PA选择的不同交叉项集之间的选择，以获得最佳性能。 该新颖的预失真器架构提供了灵活性，以便与额外的Volterra术语交换记忆深度，反之亦然。 更进一步的新颖性是能够对较高的采样率操作进行存储深度和交叉项的权衡，这可以实现更高阶的非线性预失真或支持更高的信号带宽。 多相非线性滤波模式允许这种灵活性。

公开(公告)号：US20100148865A1

公开(公告)日：2010-06-17

申请号：US12333061

申请日：2008-12-11

申请人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Gregory Copeland

发明人： Milind Anil Borkar ,  Fernando Alberto Mujica ,  Gregory Copeland

IPC分类号： H03F1/26

CPC分类号： H03F1/3241

摘要： An apparatus is provided to determine pre-distortion for a nonlinear system. The apparatus comprises a datapath and a power amplifier. The datapath employs predistortion data to generally linearized the power amplifier. To generate this predistortion data, an indirect learning circuit and a direct learning circuit can be employed. The indirect learning circuit is generally coupled to the amplifier circuit so that it can iteratively adjust predistortion data during an indirect learning mode until convergence is reached. The direct learning circuit is generally coupled to the amplifier circuit and the indirect learning circuit and that receives the input signal so that the predistortion data can be copied to the direct learning circuit from the indirect learning after convergence is reached and so that the direct learning circuit can adjust the predistortion data during a direct learning mode.

摘要翻译： 提供了一种用于确定非线性系统的预失真的装置。 该装置包括数据路径和功率放大器。 数据通路采用预失真数据，通常将功率放大器线性化。 为了产生该预失真数据，可以采用间接学习电路和直接学习电路。 间接学习电路通常耦合到放大器电路，使得其可以在间接学习模式期间迭代地调整预失真数据直到达到收敛。 直接学习电路通常耦合到放大器电路和间接学习电路，并且接收输入信号，使得预失真数据可以在达到收敛之后从间接学习中复制到直接学习电路，并且直接学习电路 可以在直接学习模式下调整预失真数据。