公开(公告)号：US06831954B1

公开(公告)日：2004-12-14

申请号：US09496120

申请日：2000-02-01

Applicant: Giridhar D. Mandyam

Inventor： Giridhar D. Mandyam

IPC: H04L2534

CPC classification number: H03F1/3294 ,  H03F2201/3231 ,  H04L27/368

Abstract: Apparatus, and an associated method, by which to predistort a send signal prior to its application to a power amplifier. Predistortion compensates for distortion introduced upon the signal during its amplification by the power amplifier. Compensation is effectuated by altering a phase component of symbols of which the signal is formed without affecting the magnitude components thereof.

Abstract translation: 装置和相关联的方法，通过该方法在发送信号应用于功率放大器之前预先发送发送信号。 预失真补偿功率放大器放大期间信号引入的失真。 通过改变形成信号的符号的相位分量而不影响其幅度分量来实现补偿。

公开(公告)号：US5450043A

公开(公告)日：1995-09-12

申请号：US222115

申请日：1994-04-01

Applicant: Yasuhide Tanaka ,  Masaho Kimura

Inventor： Yasuhide Tanaka ,  Masaho Kimura

IPC: H04L27/20 ,  H03C3/40 ,  H03F1/32 ,  H03C1/06 ,  H03C3/08 ,  H04B1/04

CPC classification number: H03C3/40 ,  H03F1/3247 ,  H03F1/3282 ,  H03F1/3294 ,  H03C2200/0058 ,  H03F2201/3231

Abstract: A quadrature modulator multiplies two carriers which are 90.degree. out of phase with each other by a sine component and a cosine component of a baseband signal, respectively, adds the product signals to each other, and amplifies the sum signal to produce a quadrature-modulated output signal. The quadrature modulator includes a phase comparator for detecting a phase distortion suffered when the sum signal is amplified, a first phase controller for correcting the phase of a single carrier generated by a carrier oscillator based on a compared phase output signal from the phase comparator, a phase difference detector for detecting the difference between 90.degree. and the phase difference between the two carriers, and a second phase controller for outputting the two carriers to be multiplied by the sine and cosine components of the baseband signal and controlling the phase difference between the two carriers generated from the single carrier whose phase distortion has been corrected by the first phase controller, into 90.degree. based on a detected output signal from the phase difference detector.

Abstract translation: 正交调制器将基带信号的正弦分量和余弦分量彼此相差90°的两个载波相乘，将乘积信号彼此相加，并且放大和信号以产生正交调制 输出信号。 正交调制器包括：相位比较器，用于检测和信号放大时遭受的相位失真;第一相位控制器，用于基于来自相位比较器的比较相位输出信号校正由载波振荡器产生的单载波的相位; 用于检测90°与两个载波之间的相位差的相位差检测器，以及用于输出要乘以基带信号的正弦和余弦分量的两个载波的第二相位控制器，并且控制两个载波之间的相位差 基于来自相位差检测器的检测出的输出信号，由相位失真由第一相位控制器校正的单载波产生的载波为90°。

公开(公告)号：US5164678A

公开(公告)日：1992-11-17

申请号：US728733

申请日：1991-07-11

Applicant: Narindra N. Puri ,  Hans Ulrich Boksberger

Inventor： Narindra N. Puri ,  Hans Ulrich Boksberger

IPC: H03F1/32

CPC classification number: H03F1/3247 ,  H03F1/3252 ,  H03F2201/3231

Abstract: A process for compensating nonlinearities in an amplifier circuit. An input signal s(t) is amplified to form an output signal y(t) using an amplifier circuit subject to nonlinearities. In accordance with the invention, a predistortion filter is connected upstream of the amplifier circuit. An aggregate signal ##EQU1## is formed in said filter from the input signal s(t) and a predistorted signal x(t) fed back from the output of the predistortion filter, and integrated with respect to time. The predistorted signal x(t) is fed to the amplifier circuit subject to nonlinearities. In this case, the prescribed number n+1 of coefficients k.sub.0, . . . , K.sub.n is determined in accordance with the model ##EQU2## so that for a given input signal x(t) of the amplifier circuit the output signal determined in accordance with the model is essentially identical with the output signal y(t) of the amplifier circuit.

Abstract translation: 用于补偿放大器电路中的非线性的过程。 输入信号s（t）被放大以使用经受非线性的放大器电路形成输出信号y（t）。 根据本发明，预失真滤波器连接在放大器电路的上游。 从输入信号s（t）和从预失真滤波器的输出反馈的预失真信号x（t）在所述滤波器中形成聚合信号，并相对于时间积分。 预失真信号x（t）被馈送到放大器电路的非线性。 在这种情况下，系数k0，...的规定数n + 1。 。 。 根据模型确定Kn，使得对于放大器电路的给定输入信号x（t），根据该模型确定的输出信号基本上与放大器的输出信号y（t）相同 电路。