功率放大器非线性特性及预失真建模研究  

Research on nonlinear characteristics and predistortion power modeling

作　　者：王金友[1] 金巧[1] 孙汉[1] 

机构地区：[1]江西理工大学信息工程学院,江西赣州341000

出　　处：《江西理工大学学报》2014年第5期85-90,共6页Journal of Jiangxi University of Science and Technology

摘　　要：论文针对功率放大器的非线性失真问题,分别以无记忆功率放大器和有记忆功率放大器输入/输出数据为基础,通过对给定数据进行拟合处理,建立了放大器的非线性多项式数学模型,并采用归一化均方误差、误差矢量幅度衡量模型的效果.针对放大器的非线性特性,采用前向串级补偿方法,得到预失真处理器的数学模型,对系统进行输入输出模拟,得到补偿后的系统输入/输出效果.最后针对信道干扰问题,通过相邻信道功率比的指标来评价所建模型对相邻信道的干扰程度分析.Aiming at the nonlinear distortion of power amplifier, based on the input/output data of memoryless power amplifier and memory power amplifier, this paper proposes a nonlinear polynomial mathematical model of the amplifier by fitting the data to a given treatment and using normalized mean square error, error vector magnitude to measure the effect of the model. Considering the nonlinear characteristics of the amplifier, the paper puts forward the mathematical model of pre-distortion processor by using the forward cascade compensation method, and simulates the input and output of the system to get the input/output effects of compensated system. Finally, aiming at the channel interference problem, this paper evaluates the extent of the proposed model for adjacent channel interference analysis through adjacent channel power ratio of indicators.

关 键 词：功率放大器 多项式传输模型 线性最小二乘拟合 线性化 预失真补偿 

分 类 号：TN914[电子电信—通信与信息系统]