基于幂级数多项式的基带预失真技术分析

为了减小功放的非线性,使系统实现线性输出,介绍了一种基于幂级数多项式的数字基带预失真技术,并论述了其基本原理和系统结构,最后从邻信道功率比(Adjacent Channel Power Ratio)、星座图、功放的幅度-幅度特性(AM-AM)三个方面进行了仿真,结果表明该预失真技术较传统的查询表预失真技术,不仅能节省大量的存储空间,而且能更好地纠正功放的非线性,预失真性能更优。

Analysis of Baseband Predistortion Technique Based on Power Polynomial

In order to reduce the nonlinearity of the power amplifier and make the system have a linear output,this paper introduces a baseband predistortion technique based on power polynomial and expounds its basic principles and structure,finally makes a simulation in aspects of adjacent channel power ratio,constellation and power amplifier＇s AM-AM characteristic.It is confirmed by simulation results that this predistortion technique not only can save lots of memory,but also has better performance compared with the traditional look-up table predistortion technique.