Nyquist第一准则的理解与应用

Understanding and Application of the First Nyquist Principle

“通信原理”课程的教学过程中,对Nyquist第一准则的理解和运用是教学重点和难点。为了充分理解Nyquist第一准则,讨论了如何根据数字基带传输系统的系统特性判断基带传输系统有无码间干扰的两种分析方法。以基带传输系统为例,给出系统无码间干扰的条件,即Nyquist第一准则,然后通过一个典型实例探讨了该准则的应用。通过对该问题的讨论,旨在加深学生对Nyquist第一准则的理解和掌握。

The understanding and application of the first Nyquist Principle are both important and difficult in‘Principles of Communications'curriculum teaching process.To understand the first Nyquist principle completely,according to the transfer function of digital based-band transmission system,two methods used to decide whether intersymbol interference exists in a digital based-band transmission system are discussed in this paper.Taking the base-band transmission system as the example at first,it gives the condition of non-inter-symbol interference of system,the first Nyquist Principle,then one typical example is presented.The discussion on relative questions of this problem is to have students to improve the correlation content understanding and grasp the first Nyquist Principle well.