数字预失真关键技术-Part2-V5.pdf

第二章 数字预失真技术理论 第一节 线性化技术概述 第二节 数字预失真基本原理 第二节 数字预失真线性化系统 第三节第三节 数字预失真器及其参数辨识数字预失真器及其参数辨识 第四节 数字预失真器参数辨识算法 第五节 峰均值比及削峰技术简介 第六节第六节 数字预失真器的数字预失真器的ADS仿真仿真 线性度和功率效率 2 功率回退 3 高功率射频功放 • High Power RF PA’s (10W) use multiple driver stages to amplify an inputinput signalsignal. • Different PA architecture’s (Class A, AB, C, etc …) offer various degrees of linearity, cost and efficiency. – RF PA’s are notoriouslyy inefficient – Air is a convenient but ppoor transmission medium. • RF PA’s are designed (tuned) for specific frequency range and bandwidth – MCPA ~= wideband RF PA, does not have to process multiple carriers • PA Gain is usually fixed – so pre-amps may be required to drive the PA input. Antenna RFinRFin == RFout = From TX Board 20dBm 50dBm Baseband @ 800MHz (100W) DUC DAC IF-RF A PA 50 Ohm Pre-Amp If Gain = 30dB, Typical Input 3 to 4 gain stages typical 4 线性化、峰