说明：  本程序，包含QPSK，OQPSK的产生过程，I、Q领路信号抽取，他们的频谱，包络情况，经过带通滤波器后的变化，经过非线性放大器后的频谱变化等。是一个很好的学习例程！
(This procedure, including QPSK, OQPSK production process, I, Q signal extraction lead the way, their spectrum envelope case, after band-pass filter after the change, through non-linear changes in the spectrum after the amplifier. Is a good learning routines!)