功率放大器数字预失真技术研究及设计.pdfVIP

学兔兔 总第49卷 第555期 电测与仪表 Vo1．49 NO．555 2012年 第3期 Electrical neasurement＆ Instrumentation Mar．2012 功率放大器数字预失真技术研究及设计 王振朝，鲁铭铭，薛文玲，李会雅 (河北大学电信学院，河北保定071002) 摘要：提出一个基于自适应预失真原理的有记忆高功率放大器线性化技术方案。首先，对白适应预失真线性化 技术的原理和特点进行详细分析，给出一个实用技术方案；其次对其中的衰减器放大倍数的影响进行探讨并给 出了选择原则和设计方法；最后对设计完成的数字预失真系统进行仿真验证。仿真结果表明，合理选择放大倍 数和动态范围对改善预失真补偿系统的性能有明显效果，对于8MHz带宽的OFDM信号，本文方案可将带外频谱 抑$~26dB，减少带内频谱失真7dB。 关键词：高功率放大器；线性化；衰减器；数字预失真；自适应算法 中图分类号：TM13 文献标识码：B 文章编号：1001—1390(2012)03—0080—05 Study on the Digital Predistortion Technique of Power Amplifier WANG Zhen-chao，LU Ming-ming，XUE Wen-ling，LI Hui—ya (College of Electron and Information，Hebei University，Baoding 07 1002，Hebei，China) Abstract：We provide a technical scheme based on the adaptive digital predistortion principle for the linearization of high power amplifier with memory in this paper．Firstly，it gives a practical technique scheme based on the analysis of adaptive digital predistortion technique．Secondly，it discusses the effect about the magnification of attenuator in the technical scheme and give the selection principles and the design methods．Lastly，a simulation analysis for the digital predistortion system is given in this paper．The simulation results show that performance of digital predistortion compensation system can be improved by adjusting magnification of attenuator and dynamic rang．For a input OFDM signal of 8MHz bandwidth，the system provided in this paper can suppress power of sideband 26dB and reduce the distortion of in—band 7dB． Key words：high power amplifier，linearization，attenuator，digital