基于动画的码间干扰问题课堂教学方法

Analysis of Intersymbol Interference in Time-domain by Animation

码间干扰概念是通信原理课程的重点内容,目前主流教材主要是围绕系统响应及其频域特性作公式说明。在充分利用PPT动画制作的基础上,演示码元及系统响应波形传输的动态过程,单从时域波形的角度直观地展示抽样环节产生的码间干扰,使概念的理解更加具体形象,避免以公式变换和频域分析引起的抽象感,从而化解难点,同时为码间干扰的克服及系统频域特性的分析提供一个良好的开端。

The concept of intersymbol interference is an important part of Communication Principle. It’s explained only by the formulas which centre on system and frequency response in current mainstream teaching materials. In the paper, it is by making animation to demonstrate dynamically the transmission process of symbol and its system response waveform, and from the angle of time domain waveform, visual display the intersymbol interference formed in sampling links. It makes the concept more concrete, avoids abstraction due to formula transformations and frequency-domain analysis, and resolve the difficulties. At the same time, it gives us a good start to eliminate intersymbol interference and analyse the frequency domain characteristics.