公开(公告)号：US20140064417A1

公开(公告)日：2014-03-06

申请号：US13701369

申请日：2012-10-26

Applicant: LSI Corporation

Inventor： Kameran Azadet

IPC: H04L27/233

CPC classification number: G06F9/3001 ,  G06F5/01 ,  G06F9/30036 ,  G06F17/15 ,  H03F1/0288 ,  H03F1/3241 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233 ,  H03H17/06 ,  H03M3/30 ,  H04B1/0003 ,  H04B1/0475 ,  H04B1/62 ,  H04B2001/0408 ,  H04L1/0054 ,  H04L25/02 ,  H04L25/03 ,  H04L25/03178 ,  H04L25/03216 ,  H04L25/4917 ,  H04L27/2334

Abstract: Methods and apparatus are provided for direct synthesis of RF signals using maximum likelihood sequence estimation. An RF digital RF input signal is synthesized by performing maximum likelihood sequence estimation on the digital RF input signal to produce a digital stream, such that after filtering by a prototype filter the produced digital stream produces a substantially minimum error. The substantially minimum error comprises a difference between a digital output of the prototype filter and the digital RF input signal. The digital stream is substantially equal to the input digital RF signal. The digital stream can be applied to an analog restitution filter, and the output of the analog restitution filter comprises an analog RF signal that approximates the digital RF input signal.

Abstract translation: 提供了使用最大似然序列估计直接合成RF信号的方法和装置。 通过对数字RF输入信号执行最大似然序列估计来合成RF数字RF输入信号以产生数字流，使得在通过原型滤波器滤波之后，所产生的数字流产生基本上最小的误差。 基本上最小的误差包括原型滤波器的数字输出和数字RF输入信号之间的差异。 数字流基本上等于输入的数字RF信号。 数字流可以应用于模拟恢复滤波器，并且模拟恢复滤波器的输出包括近似数字RF输入信号的模拟RF信号。

公开(公告)号：US08610500B2

公开(公告)日：2013-12-17

申请号：US13749914

申请日：2013-01-25

Applicant: Chunlong Bai

Inventor： Chunlong Bai

IPC: H03F1/26

CPC classification number: H03F1/3247 ,  H03F1/3252 ,  H03F1/3258 ,  H03F3/19 ,  H03F3/24 ,  H03F2201/3209

Abstract: A predistorter applies a distortion function to an input signal to predistort the input signal. The output of the distortion function is modeled as the sum of the output signals from the orthogonal basis functions weighted by corresponding weighting coefficients. Techniques are described for orthogonalizing the basis function output signals depending on the distribution of the input signal.

Abstract translation: 预失真器将失真函数应用于输入信号以预失真输入信号。 失真函数的输出被建模为由相应加权系数加权的正交基函数的输出信号之和。 描述了根据输入信号的分布使基函数输出信号正交化的技术。

公开(公告)号：US08390375B2

公开(公告)日：2013-03-05

申请号：US13018741

申请日：2011-02-01

Applicant: Takumi Miyashita

Inventor： Takumi Miyashita

IPC: H03F1/26

CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F2201/3209

Abstract: A calculating apparatus includes a first state variable calculating unit that calculates first state variables respectively having a memory effect and being of an amplifier that causes signal distortion; an amplifier model unit that based on the calculated first state variables, calculates the signal distortion caused by the amplifier, as a distortion characteristic; and an output unit that outputs the calculated distortion characteristic.

Abstract translation: 计算装置包括：第一状态变量计算单元，其计算分别具有存储效应的第一状态变量，以及产生引起信号失真的放大器; 基于计算出的第一状态变量的放大器模型单元计算由放大器引起的信号失真作为失真特性; 以及输出单元，其输出计算的失真特性。

公开(公告)号：US20120229206A1

公开(公告)日：2012-09-13

申请号：US13477941

申请日：2012-05-22

Applicant: John-Peter van Zelm ,  Peter Rashev

Inventor： John-Peter van Zelm ,  Peter Rashev

IPC: H03F3/68 ,  H03F1/34

CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/24 ,  H03F3/68 ,  H03F2200/132 ,  H03F2200/192 ,  H03F2200/204 ,  H03F2200/207 ,  H03F2201/3209 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: Included is a radio transmission system comprising a plurality of power amplifiers (PAs); a plurality of Volterra Engine (VE) linearizers corresponding to the PAs; a plurality of feedback loops corresponding to the PAs; at least one digital hybrid matrix (DHM) coupled to the VE linearizers; and an analog hybrid matrix (AHM) coupled to the PAs, wherein the feedback loops are connected to the AHM and the VE linearizers but not to the PAs to reduce the number of feedback loops. Also included is a radio system comprising a plurality of PAs; a Volterra DHM (VDHM) coupled to the PAs; a plurality of feedback loops corresponding to the PAs; and an AHM coupled to the PAs, wherein the feedback loops are connected to the AHM but not to the PAs to reduce the number of feedback loops.

Abstract translation: 包括包括多个功率放大器（PA）的无线电传输系统; 对应于PA的多个Volterra引擎（VE）线性化器; 对应于PA的多个反馈回路; 耦合到所述VE线性化器的至少一个数字混合矩阵（DHM）; 以及耦合到PA的模拟混合矩阵（AHM），其中反馈回路连接到AHM和VE线性化电路，而不连接到PA以减少反馈回路的数量。 还包括包括多个PA的无线电系统; 耦合到PA的Volterra DHM（VDHM） 对应于PA的多个反馈回路; 以及耦合到PA的AHM，其中反馈回路连接到AHM，而不连接到PA以减少反馈回路的数量。

公开(公告)号：US20120200355A1

公开(公告)日：2012-08-09

申请号：US13368125

申请日：2012-02-07

Applicant: RICHARD NEIL BRAITHWAITE

Inventor： RICHARD NEIL BRAITHWAITE

IPC: H03F3/00 ,  H03F1/26

CPC classification number: H03F3/24 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F3/189 ,  H03F2201/3209 ,  H03F2201/3224 ,  H04B1/0028 ,  H04B2001/0425 ,  H04L27/368

Abstract: Digital predistortion (“DPD”) of an RF power amplifier for signals comprising two widely spaced carrier clusters is proposed. The basis waveforms within the DPD are selected to allow for the use of a lower sampling rate. As one example, multi-carrier signals spanning 60 MHz of bandwidth may be linearized using a sample rate of 100 MHz for the DPD module and the observation path, as opposed to a sample rate exceeding 300 MHz (5 times Nyquist) used conventionally. A transmit (Tx) filter is located after the power amplifier to attenuate distortion modes exceeding the sampling rate used.

Abstract translation: 提出了用于包括两个宽间隔的载波簇的信号的RF功率放大器的数字预失真（“DPD”）。 选择DPD内的基本波形以允许使用较低的采样率。 作为一个示例，与通常使用的超过300MHz（5倍奈奎斯特）的采样率相反，DPD模块和观察路径的采样率为100MHz可以对跨越60MHz带宽的多载波信号进行线性化。 发射（Tx）滤波器位于功率放大器之后，以衰减超过所使用的采样率的失真模式。

公开(公告)号：US20120194270A1

公开(公告)日：2012-08-02

申请号：US13285972

申请日：2011-10-31

Applicant: Paulo Correa ,  Andre A. Castro

Inventor： Paulo Correa ,  Andre A. Castro

IPC: H03F1/26

CPC classification number: H03F1/3241 ,  H03F1/3282 ,  H03F2200/192 ,  H03F2200/204 ,  H03F2200/36 ,  H03F2201/3209 ,  H03F2201/3224

Abstract: A system including a power amplifier and a pre-distortion module coupled to the power amplifier. The pre-distortion module includes one or more smaller versions of the power amplifier to generate a pre-distortion signal that compensates for any memory-effect or inertia present in the power amplifier with application on frequency hopping and larger (up to 1 octave) instantaneous bandwidth communication systems.

Abstract translation: 一种包括功率放大器和耦合到功率放大器的预失真模块的系统。 预失真模块包括功率放大器的一个或多个较小版本，以产生预失真信号，该预失真信号通过应用于跳频和更大（最多1个八度）瞬时来补偿功率放大器中存在的任何存储器效应或惯性 带宽通信系统。

公开(公告)号：US20120154039A1

公开(公告)日：2012-06-21

申请号：US13129669

申请日：2009-11-16

Applicant: James Brice

Inventor： James Brice

IPC: H03F1/32

CPC classification number: H03F1/3247 ,  H03F2201/3209

Abstract: There is disclosed a method for generating pre-emphasis coefficients for a pre-emphasis stage of a non-linear distorting device, the method comprising the steps of: capturing, for a given time period, samples of an input signal and samples of an output signal; determining the direction of an error between the captured samples; adjusting the input signal in a direction to reduce the error to generate an estimate of the pre-distorted input signal; generating updated pre-distortion coefficients in dependence on the estimate of the pre-distorted input signal and generated pre-distortion coefficients for one or more previous time periods.

Abstract translation: 公开了一种用于产生用于非线性失真装置的预加重阶段的预加重系数的方法，所述方法包括以下步骤：在给定时间段内捕获输入信号和输出样本的样本 信号; 确定捕获的样本之​​间的误差的方向; 在一个方向上调整输入信号以减小误差以产生预失真输入信号的估计; 根据预失真输入信号的估计和产生一个或多个先前时间段的预失真系数产生更新的预失真系数。

公开(公告)号：US20110268226A1

公开(公告)日：2011-11-03

申请号：US13094319

申请日：2011-04-26

Applicant: Alexander N. LOZHKIN

Inventor： Alexander N. LOZHKIN

IPC: H04L25/49

CPC classification number: H03F1/3247 ,  H03F2201/3209

Abstract: A memory effect canceller includes a sample obtaining section that obtains a plurality of discrete-time samples of a transmission signal supplied to a power amplifier that amplifies a transmission signal, a signal generation section that generates a correction signal that is a weighted linear combination, using given weighting coefficients, of partial derivatives of a transfer function of the power amplifier, wherein the transfer function has been defined in advance with a plurality of discrete-time samples as input variables, and wherein the partial derivatives are based on the discrete-time samples obtained by the sample obtaining section at respective times, and a signal correction section that corrects an output signal of the power amplifier based on the correction signal.

Abstract translation: 存储器效应消除器包括获取提供给放大发送信号的功率放大器的发送信号的多个离散时间样本的采样获取部分，使用加权线性组合产生校正信号的信号产生部分，使用 给定的权重系数，功率放大器的传递函数的偏导数，其中传递函数已经被预先定义为多个离散时间样本作为输入变量，并且其中偏导数基于离散时间样本 以及信号校正部，其基于校正信号来校正功率放大器的输出信号。

公开(公告)号：US20100156471A1

公开(公告)日：2010-06-24

申请号：US12340307

申请日：2008-12-19

Applicant: Frederic Roger

Inventor： Frederic Roger

IPC: H02M11/00

CPC classification number: H03F3/45183 ,  H03F1/3211 ,  H03F1/3241 ,  H03F2200/336 ,  H03F2201/3209

Abstract: A cost function generator circuit includes memory terms each receiving one or more input signals, and each providing inphase and quadrature output current signals. The inphase and quadrature output currents of the memory terms are summed to provide combined inphase and quadrature output currents, respectively. Transimpedance amplifiers are provided to transform the combined inphase and quadrature output currents into an inphase output voltage and a quadrature output voltage.

Abstract translation: 成本函数发生器电路包括各自接收一个或多个输入信号的存储器项，并且每个都提供同相和正交输出电流信号。 存储器项的同相和正交输出电流被相加以分别提供组合的同相和正交输出电流。 提供互阻抗放大器以将组合的同相和正交输出电流转换为同相输出电压和正交输出电压。

公开(公告)号：US07460613B2

公开(公告)日：2008-12-02

申请号：US10492981

申请日：2002-10-29

Applicant: Karl-Gösta Sahlman

Inventor： Karl-Gösta Sahlman

IPC: H04L25/49

CPC classification number: H03F1/3258 ,  H03F1/3247 ,  H03F2201/3209

Abstract: A solution is disclosed for achieving a functional complex base-band adaptive digital nonlinear device model providing RF-power amplifier distortion (i.e. linearization or pre-distortion) minimizing distortion characterization including memory effects. The present inventive solution is based on real device non-linear performance observations and the physical cause for the distortion is compensated in the application. This also means that a pre-distorter digital circuit is derived to have the inverse functionality of the digital device model. The model and the digital pre-distortion circuit are designed in such way, that function blocks are connected in cascade. Each function block is then designed to handle a certain type of distortion performance and can be optimized individually. The model gives possibilities to describe and evaluate different device properties. An accurate AM to AM and AM to PM characterization can be evaluated and the frequency response of the device when excited with envelope-modulated signals can be evaluated. The properties evaluated can also be used in a test procedure in a production facility to verify production quality.

Abstract translation: 公开了一种用于实现功能性复合基带自适应数字非线性器件模型的解决方案，其提供RF功率放大器失真（即，线性化或预失真），使包括存储器效应的失真特性最小化。 本发明的解决方案基于实际设备非线性性能观察，并且在应用中补偿了失真的物理原因。 这也意味着预失真数字电路被导出为具有数字设备模型的反向功能。 模型和数字预失真电路以这种方式设计，功能块级联连接。 然后，每个功能块被设计为处理某种类型的失真性能，并可以单独优化。 该模型给出描述和评估不同设备属性的可能性。 可以评估AM到AM和AM到PM表征的精确AM，并且可以评估当用包络调制信号激发时器件的频率响应。 评估的性质也可用于生产设备的测试程序，以验证生产质量。