要解决这个问题，必须采用线性化技术来改善高效率功率放大器的非线性特性。
For solving this problem, various linearization techniques have been employed to improve the linearity of high efficiency power amplifier.
自适应数字预失真是补偿高功率放大器非线性的一种有效技术。
Adaptive digital predistortion is an effective technique which compensate nonlinear distortion introduced by the high power amplifier (HPA).
自适应基带预失真技术是用于补偿高功率放大器非线性失真的一种有效技术。
Adaptive baseband predistortion is an effective technique for compensating nonlinear distortion introduced by high power amplifiers.
OFDM系统的一个主要缺陷就是峰平比过高引起的高功率放大器(HPA)的非线性失真。
The OFDM system has a major disadvantage that high peak to average power ratio (PAPR) can cause nonlinear distortion in the high power amplifier (HPA).
研究了DBF发射多波束阵列中固态功率放大器（SSPA）非线性引起的互调波束的影响。
This paper investigates the effects of intermodulation(IM) beams produced by the nonlinear behavior of solid-state power amplifiers(SSPA) on the DBF transmiting multiple-beam array.
为了在不损失效率的条件下降低功率放大器的非线性失真现在广泛采用了线性化技术。
Linearizeation technology is now widely used in order to reduce the power amplifier nonlinear distortion without loss of efficiency.
根据功放的实测AM-AM、AM-PM特性，采用时域分析方法，并应用带通非线性理论和数字信号处理技术，分析了宽带数字调制信号激励下的射频功率放大器非线性失真特性。
The method is based on AM-AM?AM-PM characteristics of a nonlinear power amplifier and application of band -pass nonlinearity theory and digital signal processing techniques.
而功率放大器又具有非线性特性，因此要设计高效率又高线性度的无线发射机便成了一个相当困难的挑战。
Designing a high linearity and high power efficiency wireless transmitter is a big challenge due to the nonlinear characteristic of the power amplifier.
为保证通信质量需要使用高线性的功率放大器，而高效率的功率放大器通常是非线性的。
The high linear power amplifier has to be used to guarantee communication quality. Unfortunately, power efficient amplifiers are typically nonlinear.
本文首先研究了功率放大器的非线性失真问题，提出了预失真处理的改善方案。
Firstly, the nonlinear characteristic of RF power amplifier is studied in the article and the improvement project is proposed.
本文提出了一种用于正交频分复用（OFDM）系统中由大功率放大器引起的非线性失真的有效的数字自适应补偿方法。
The paper presents an efficient digital adaptive method compensating for nonlinear distortions caused by a high-power amplifier (HPA) in orthogonal frequency division multiplexing(OFDM) system.
提出了研究正交频分复用(OFDM)信号通过高功率放大器产生的带内非线性畸变的一种新方法。
A new evaluation approach for the in-band nonlinear distortion, which is formed by the orthogonal frequency division multiplex (OFDM) signal passing through the high power amplifier, is presented.
本文首先从理论上分析了功率放大器的非线性特性，介绍了目前各种线性化技术的原理和优缺点。
In this thesis, the non-linear characteristics of power amplifiers are analyzed in theory at first. The principle, advantages and disadvantages of various linearization techniques are discussed.
开关功率放大器的优势是它具有高效率，但是由于其本身固有的非线性，开关功率放大器的失真通常大于传统的线性放大器。
The advantage of the switching amplifier is the high efficiency, but the distortion is still bigger than the linear amplifier because of the switching working and it's non-linear.
开关功率放大器由于开关变换器本身固有的非线性，失真通常大于传统的线性放大器。
The distortion introduced by switching power amplifier is typically larger than in their liner counterparts due to intrinsic nonlinearity of switching converter.
但是OFDM信号有高的峰值平均功率比，当它通过高功率放大器时会导致非线性失真，从而使得系统的性能下降。
But the OFDM signal has a large PAPR, which results in the significant nonlinear distortion when it passes through a HPA (high power amplifier), thereby the performances of the system descend.
其中包括：（1）功率放大器的非线性特性和记忆效应的测量；
The main content of this dissertation include: (1) The measurement on nonlinearity and memory effect of power amplifiers;
并结合功率放大器的设计，提出和研究了提高功率放大器的非线性方法。
The linearization technology of RF power amplifier is studied through the design of RF power amplifier.
并结合功率放大器的设计，提出和研究了提高功率放大器的非线性方法。
The linearization technology of RF power amplifier is studied through the design of RF power amplifier.
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