公开(公告)号：US06850114B2

公开(公告)日：2005-02-01

申请号：US10450032

申请日：2001-11-28

申请人： Thorsten Nygren ,  Leonard Rexberg ,  Bernt Johansson

发明人： Thorsten Nygren ,  Leonard Rexberg ,  Bernt Johansson

IPC分类号： H03F1/32 ,  H03F1/26

CPC分类号： H03F1/3258 ,  H03F1/3247

摘要： A method and an arrangement is disclosed for linearizing the output signal from an inherently non-linear device, e.g. an amplifier, producing intermodulation or non-linear products. A pre-distorter having a unity transfer function is located between a signal input and the input of the inherently non-linear device. Furthermore a second device forming a post-distorter is coupled to the output of the nonlinear device in a way to be able to handle the amplified output signal or a portion of the output signal. According to the present method the post-distorter is optimized to give as output the same signal spectrum content as what is input to the non-linear device, whereafter the achieved parameters of the post-distorter are transferred to the pre-distorter. In other words a copy of the optimized post-distorter is then used as a pre-distorter in front of the non-linear device to obtain an improved output signal in terms of signal quality from the inherently non-linear device. The post-distorter is then optimized once more and parameters are again transferred to the pre-distorter as a further as a further small correction. In operation this is then generally repeated in a suitable scheduled way to give an ongoing correction to the pre-distortion. The pre-distorter and post-distorter may both be either digital devices or analog devices.

摘要翻译： 公开了一种用于线性化来自固有非线性装置的输出信号的方法和装置，例如， 一个放大器，产生互调或非线性产品。 具有单位传递函数的预失真器位于信号输入和固有非线性设备的输入之间。 此外，形成后变压器的第二装置以能够处理放大的输出信号或输出信号的一部分的方式耦合到非线性装置的输出端。 根据本方法，后变形器被优化以给出输出与输入到非线性装置的信号频谱内容相同的信号频谱内容，然后将后失真器的实现参数传送到预失真器。 换句话说，优化的后变压器的副本然后被用作非线性装置前的预失真器，以获得来自固有的非线性装置的信号质量的改进的输出信号。 然后再次优化后变形器，并将参数再次转移到预失真器作为进一步的小的校正。 在操作中，然后通常以适当的调度方式重复以给出对失真的持续校正。 预失真器和后置失真器可以是数字设备或模拟设备。

公开(公告)号：US07268620B2

公开(公告)日：2007-09-11

申请号：US10508314

申请日：2003-03-14

申请人： Thorsten Nygren ,  Leonard Rexberg

发明人： Thorsten Nygren ,  Leonard Rexberg

IPC分类号： H03F1/26

CPC分类号： H03F1/3241

摘要： New technology is described to calculate and optimize a pre-distorter avoiding the need of time-alignment between input and output of the amplifier. An analog output spectrum is used to compute an optimum pre-distorter, either in digital or analog format. The output spectrum is used to optimize intermodulation performance rather than trying to match the input spectrum to the output spectrum. The output spectrum (except for a possible gain constant) can be used as input to the optimization procedure. Since the intermodulation products usually are of much lower amplitude than the carriers themselves, it can be taken as the input spectrum without major loss of confinement. Mathematical procedures to calculate a pre-distorter using only the output signal are outlined.

摘要翻译： 描述了新技术来计算和优化预失真器，避免了放大器的输入和输出之间的时间对准。 模拟输出频谱用于计算数字或模拟格式的最佳预失真器。 输出光谱用于优化互调性能，而不是尝试将输入光谱与输出光谱相匹配。 输出频谱（可能的增益常数除外）可用作优化过程的输入。 由于互调产物的幅度通常低于载波本身的幅度要低得多，所以它可以作为输入频谱，而没有大的限制损失。 概述了仅使用输出信号计算预失真器的数学程序。

公开(公告)号：US20050237111A1

公开(公告)日：2005-10-27

申请号：US10508314

申请日：2003-03-14

申请人： Thorsten Nygren ,  Leonard Rexberg

发明人： Thorsten Nygren ,  Leonard Rexberg

IPC分类号： H03F1/32 ,  H03F1/26

CPC分类号： H03F1/3241

摘要： The present invention proposes a new specific method to calculate and optimise a pre-distorter avoiding the need of time-alignment between input and output of the amplifier. That is, the analogue output spectrum is used directly to compute an optimum pre-distorter, either in digital or analogue format. The solution proposed uses the output spectrum directly to optimise intermodulation performance, rather than trying to match the input spectrum to the output spectrum. That is, the output spectrum (except for a possible gain constant) can be used as input to the optimisation procedure directly. Since the intermodulation products usually are of much lower amplitude than the carriers themselves, it can be taken as the input spectrum without major loss of confinement. The present disclosure outlines in detail the mathematical procedure to actually calculate a proper predistorter using only the ouptut signal.

摘要翻译： 本发明提出了一种新的具体方法来计算和优化预失真器，避免了放大器的输入和输出之间的时间对准。 也就是说，模拟输出频谱直接用于以数字或模拟格式计算最佳预失真器。 所提出的解决方案直接使用输出频谱来优化互调性能，而不是尝试将输入频谱与输出频谱相匹配。 也就是说，输出频谱（可能的增益常数除外）可以直接用作优化过程的输入。 由于互调产物的幅度通常低于载波本身的幅度要低得多，所以它可以作为输入频谱，而没有大的限制损失。 本公开详细地概述了仅使用输出信号实际计算适当的预失真器的数学过程。

公开(公告)号：US06326843B1

公开(公告)日：2001-12-04

申请号：US09512607

申请日：2000-02-25

申请人： Thorsten Nygren ,  Alina Oramas Alvarez

发明人： Thorsten Nygren ,  Alina Oramas Alvarez

IPC分类号： H03F126

CPC分类号： H03F1/3241 ,  H03F2200/198

摘要： A reflective predistorter compensates for phase and amplitude variations imposed on an input signal by one or more non linear transfer characteristics of, for example, a power amplifier operating at or near saturation. The predistorter includes a hybrid having an input terminal, an output terminal and at least two relative phase terminals separated by 90 degrees. A first compensation circuit may be coupled to one of the relative phase terminals and may include a combination of linear and passive non-linear circuit elements. A second compensation circuit, identical to the first compensation circuit may be coupled to an other of the relative phase terminals includes a second combination of linear and passive non-linear circuit elements. The passive non-linear circuit elements may be one or more diodes and if more than one, the diodes are not configured as antiparallel. A first and second bias control circuit may be included for controlling a bias level in the first and second compensation circuit.

摘要翻译： 反射预失真器通过例如在或接近饱和的功率放大器的一个或多个非线性传递特性来补偿施加在输入信号上的相位和幅度变化。 预失真器包括具有输入端子，输出端子和至少两个被相隔90度的相对相位的混合器。 第一补偿电路可以耦合到相对相位端子之一，并且可以包括线性和无源非线性电路元件的组合。 与第一补偿电路相同的第二补偿电路可以耦合到相对相位端子中的另一个包括线性和无源非线性电路元件的第二组合。 无源非线性电路元件可以是一个或多个二极管，并且如果多于一个，二极管不被配置为反平行。 可以包括第一和第二偏置控制电路以控制第一和第二补偿电路中的偏置电平。

公开(公告)号：US5386198A

公开(公告)日：1995-01-31

申请号：US10274

申请日：1993-01-28

申请人： Krister I. Ripstrand ,  Thorsten Nygren

发明人： Krister I. Ripstrand ,  Thorsten Nygren

IPC分类号： H03F1/32 ,  H03F3/20

CPC分类号： H03F1/3235 ,  H03F2201/3212 ,  H03F2201/3218

摘要： A method and apparatus for controlling a feed-forward compensated power amplifier system is disclosed which uses a spread spectrum technique to cover a control signal or signals and injects a composite signal at a suitable point into the feed-forward amplifier system to reduce distortion. The amount of bandwidth spread is governed by the amount of processing gain needed in the remapping process and the needed time response of the system. Control signals after remapping of the spread spectrum at the output of the system are correlated in a match filter correlator and the result is used to control, in either polar or cartesian coordinates, the injection, in anti-phase, of the extracted distortion into the feed forward amplifier output.

摘要翻译： 公开了一种用于控制前馈补偿功率放大器系统的方法和装置，其使用扩展频谱技术来覆盖控制信号或信号，并将适当点处的复合信号注入到前馈放大器系统中以减少失真。 带宽扩展量由重新映射过程中所需的处理增益量和系统所需的时间响应决定。 在系统输出端重新映射扩频后的控制信号在匹配滤波器相关器中相关，并且结果用于以极坐标或笛卡尔坐标方式控制所提取的失真的反相注入到 前馈放大器输出。