成型滤波器法仿真平坦衰落信道，功率谱密度为高斯谱-Flat fading channel simulation of the shaping filter method, power spectral density for the Gaussian spectrum

实现QPSK调制，并且实现其星座图，得到QPSK的功率谱密度-QPSK modulation，again star point picture and PSD of QPSK