Matlab在星座图教学中的应用研究

The Application Research of Matlab in Constellation Teaching

星座图是《通信原理》课程中的一个重点和难点,对于进一步深入掌握数字调制有着非常重要的作用。本文阐述了各种数字调制星座图的基本原理,并借助于Matlab仿真软件,对多种数字调制的星座图进行仿真。最后以QPSK调制为例,对不同信噪比之下的星座图进行了观察,验证了星座图在判断通信系统的误码率性能方面的直观作用。

Constellation, a key and difficult in Principle of Communication course, is very important for further understanding of the digital modulation. The basic principles of constellation of various ways of digital modulation are described, and a variety of constellation of digital modulation is simulated using Matlab simulation software. Finally, taking the QPSK modulation for example, constellations are ob served under different signal to noise ratio（SNR）, and the visual effect of constellation is verified to deter mine the bit error rate performance in the communication system.