改进的高精度功率放大器校准方法  

Improvement method for high precision power amplifier calibration

作　　者：陈新[1] 陈双双[1] 林晓焕[1] 

机构地区：[1]西安工程大学电子信息学院,西安710048

出　　处：《国外电子测量技术》2016年第4期46-49,54,共5页Foreign Electronic Measurement Technology

摘　　要：针对当前无线通信系统中,功率放大器的校准效果是衡量一个系统好坏程度的重要指标,因而对功率放大器的校准具有重要作用。本文首先分析了射频模块的系统构成和控制机制,并对系统进行数理建模,将传统射频功率校准的问题转变成参数估值的问题。接着提出了精度和复杂度可控的基于能量守恒的最小均方(LMS)算法,该方法将变量的代数运算限制在一定的范围,而且不需要严格的限制输入数据的分布情况,这对于校准射频信号是极为有利的。仿真结果说明了所提出的算法能有效的将发射功率抑制在0.5dB范围内。For the current wireless radio communications system,the calibration effect of power amplifier（PA）is a good evaluation criterion for radio frequency（RF）power calibration to calibrate the power amplifiers.This paper analyzes the RF module and the control mechanism firstly,and a mathematical model constructed to transform the traditional problem of power calibration into parameters estimation.A least mean square（LMS）algorithm based on energy conservation is then proposed to regulate the accuracy and complexity.The method of calculating the algebraic variables limited to a certain range,and does not require strictly the distribution of the input data,which is quite excellent for PA calibration.The simulation results illustrate the proposed algorithm can suppress efficiently the output power within 0.5dB.

关 键 词：能量守恒 LMS算法 射频系统建模 功率放大器参数 

分 类 号：TN97[电子电信—信号与信息处理]