基于matlab的qpsk调制解调仿真，正交相移键控(Quadrature Phase Shift Keyin,QPSK)是一种数字调制方式。它分为绝对相移和相对相移两种。(Simulation and Simulation of QPSK modulation and demodulation based on MATLAB Orthogonal phase shift keying is a digital modulation method. It is divided into two