MPSK 调制信号的产生

M进制，$k=log_2M$

$$S_{MPSK}=A\cos(w_ct+\varphi _i) \\ \varphi _ i=\frac{2\pi i}{M} \qquad i=0,1,\cdots,M-1$$

$$S_{MPSK}=g(t)\cos(w_ct+\varphi _i)=g(t)a_{ic}\cos\omega_ct - g(t) a_{is} \sin \omega_s t$$