一种基于分段线性化的低邻道泄漏预失真方法

摘要

A new method of linearity based on predistortion for memory nonlinear system is introduced in this paper .Differ-ent from the traditional predistortion models (direct study model and indirect study model ) ,the transfer function instead of the in-verse transfer function is obtained for memory nonlinear system .The transfer function is presented as piecewise linear function first , and then be used in predistortion process .The results show that the NMSE (Normalized Mean Square Error ) of the memory nonlin-ear system output is reduced about 80dB ,and the ACLR (Adjacent Channel Leakage Ratio ) is reduced over 70dB ,comparing with no predistortion system .The memory and nonlinear characteristics are eliminated ,and the relationship of input and output becomes linear and memoryless .%本文基于预失真技术提出一种记忆非线性系统的线性化处理方法。与传统预失真模型（直接学习型、间接学习型）获取系统逆传递函数的方式不同，这里采用直接获取记忆非线性系统传递函数的方式，将传递函数表示为分段线性化形式后，应用于所提出的预失真方法中。验证结果显示，该方法与无预失真情况相比，记忆非线性系统输出的归一化均方误差改善约80dB ，且邻道泄漏比的改善值超过70dB ，克服系统的记忆性、非线性，让记忆非线性系统的输出和输入呈现线性关系。