浅析双线性变换法中的预畸变问题

A Brief Analysis on the Predistortion Problem inthe Bilinear Transformation Method

现有数字信号处理教材在讲述双线性变换法中预畸变概念时略有不足,在一定程度上影响了读者对“畸变”、“预畸变”以及“为什么叫预畸变”等概念的理解和掌握。本文通过两个滤波器设计实例,合理地引出了双线性变换法中预畸变的相关概念,并指出了预畸变概念存在的条件。教学实践证明,通过设计合理的实例来讲述预畸变的概念,能有效加深学生对预畸变概念的认识和理解。

In existed textbooks of digital signal processing,the concept of frequency prewarping transformation in bilinear transformation is not narrated clearly.This affects the readers on mastering the correlation concept of“warping”,“prewarping”and“why named prewarping”in a certain degree.According the teaching experience,this paper derives the concept of frequency prewraping in bilinear transformation naturally through two filter design examples and points out the premise which the concept suits.It cannot be separated from the analogue environment which compares.It has been proved in practice that narratingthe concept through design examples can deepen students to understand the concept effectively.