一种高效的功放自适应预失真器设计  

Design Method of Efficient Adaptive Predistorter for High Power Amplifier

作　　者：庞兴豪[1,2] 任国春[2] 徐以涛[2] 陈斌[2] 李宝柱[3] 

机构地区：[1]中国人民解放军66061部队 [2]解放军理工大学通信工程学院 [3]中国人民解放军66166部队

出　　处：《数据采集与处理》2011年第2期235-240,共6页Journal of Data Acquisition and Processing

摘　　要：在对高功率放大器(HPA)进行自适应预失真过程中,为提高自适应算法运用的灵活性和自适应的收敛速率,解决幅度自适应预处理过程中对幅度过度压缩而影响功放输出功率和效率的问题,设计出一种高效的HPA自适应预失真器。该方案中幅度、相位预失真器相级联,对幅度预失真器采用间接自适应结构进行训练;相位预失真器直接对功放幅度-相位(AM-PM)特性进行辨识,然后取反得到,AM-PM特性辨识器同时又是相位预失真器,能够提高HPA自适应预失真过程中自适应算法运用的灵活性和自适应收敛速率;幅度预失真器基于正弦函数系模型,自适应预失真过程可以同时兼顾功放效率、输出功率和线性度3项重要指标。最后以M-QAM和双音信号为例进行仿真测试,验证了该方法的优势。An efficient adaptive predistorter for HPA is designed to improve the flexibility of adaptive algorithms as well as the convergence rate of adaption,and to overcome the amplifier over-compressing in the process of high power amplifier（HPA） adaptive predistortion,Firstly,the amplitude-amplitude（AMAM） and amplitude-phase（AM-PM） adaptive predistorter uses a tandem structure.On one side,amplitude predistortion device adopts the indirect adaptive structure to train;on the other side,phase predistortion device is obtained by directly identifying the AM-PM characteristics of the amplifier.It can make the adaptive algorithms more flexible and the convergence rate much faster.Then,the amplitude predistorter based on sinusoid can give attention to efficiency,maximal export power and linearity.Finally,M-QAM and two-tone test signal are taken as examples to carry out simulation.Results verify the advantages of the technology.

关 键 词：功率放大器 自适应预失真 结构 正弦函数系 

分 类 号：TN911.72[电子电信—通信与信息系统]