为了使数字信号在信道中有效地传播，必须使用数字基带信号的调制与解调，以使得信号与信道的特性相匹配。基于matlab实验平台实现对数字信号的2psk的调制与解调的模拟。本文详细的介绍了PSK波形的产生和仿真过程加深了我们对数字信号调制与解调的认知程度。-To make effective dissemination of the digital signals in the channel, must use the modulation and demodulation of the digital baseband signal, such that the signal and channel characteristics match. Based on the simulation matlab experimental platform of the digital signal 2psk modulation and demodulation. This paper introduces the the PSK waveform generation and simulation process has deepened our awareness level of the digital signal modulation and demodulation.