模拟QPSK发射和接受的一个程序，带I-Q修正，对于理解QPSK有很好的作用-QPSK Transmitter and I-Q Correlation Receiver

M-file models a QPSK RXTX at passband using a correlation receiver and low pass filters. This m-file is a revision of QPSK TXRX SYSTEM ANALYSIS published earlier.