QAM16在通信系统中是一种简单的调制方式，可以提高频谱利用率，该程序可以恢复QAM16的星座图-QAM16 in a communication system is a simple modulation, spectral efficiency can be improved, the program can resume constellation QAM16

无线通信qpsk调制键控移相调制（QPSK）：调制效率高，要求传送途径的信噪比低，适合卫星广播。 -The wireless communication phase shift keying modulation qpsk modulation (QPSK): high modulation efficiency of the transmission path low SNR required for satellite broadcasting.