数字调制解调技术在数字通信中占有非常重要的地位。为了使数字信号在带通信道中传输,必须用数字信号对载波进行调制。本文根据当今现代通信技术的发展,对QPSK信号的调制解调问题进行了分析,文中介绍了QPSK调制解调的原理,并用动态系统设计、仿真和分析软件System View进行系统仿真,而且分析了仿真结果。 Digital modulation and demodulation technology occupies a very important position in digital communication. In order for the digital signal to be transmitted in the bandpass channel, the carrier must be modulated with a digital signal. According to the development of modern communication technology, this paper analyzes the modulation and demodulation problem of QPSK signal. In this paper, the principle of QPSK modulation and demodulation is introduced, and the system simulation of system QPSK modulation and demodulation is carried out. result.