Phase-only predistortion for LINC amplifiers with Chireix-outphasing combiners

被引：26

作者：

Birafane, A ^{[1
]}

Kouki, AB ^{[1
]}

机构：

[1] Ecole Technol Super, Dept Elect Engn, Communicat & Microelect Lab, Montreal, PQ H3K 1K3, Canada

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2005年 / 53卷 / 06期

关键词：

distortion; linear amplification with nonlinear components (LINC); microwave transmitter; phase distortion; power amplifiers; predistortion;

D O I：

10.1109/TMTT.2005.848748

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Nonlinearities in linear amplification with nonlinear components (LINC) amplifiers using Chireix-outphasing combiners are studied and their sources are identified. A generalized analytical approach for finding phase-only predistortion functions to linearize these amplifiers is presented. Two distinct analytical solutions are found and are applied for phase-only linearization. The first solution consists of a static constant phase predistortion, which is introduced in one of the two RF amplifier branches. This constant phase is determined analytically as function of the value of the reactance of the stub used in the Chireix combiner. The second solution is a variable phase-distortion function, which is derived in explicit form. The two predistortion functions preserve constant envelope operation of the amplifiers. The impact of the two predistortion functions on the combiner efficiency is also investigated. It is found, through simulation with a code-division multiple-access signal and an experimental measurement with a 16 quadrature-amplifier-modulation signal that the two predistortion functions perfectly linearize the amplifier. It also shown analytically that, with perfect. linearity, the efficiency of Chireix-outphasing amplifier is reduced and is, at best, equal to that of the LINC amplifier with a resistive combiner.

引用

页码：2240 / 2250

页数：11

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