中文说明：
利用matlab仿真软件，实现8QAM调制。在实现时采用正交调幅的方式,某星座点在I坐标上的投影去调制同相载波的幅度,在Q坐标上的投影去调制正交载波的幅度,然后将2个调幅信号相加就是所需的调相信号。
English Description：
Using MATLAB simulation software, 8qam modulation is realized. Quadrature amplitude modulation is adopted in the implementation. The projection of a constellation point on the I coordinate is used to modulate the amplitude of the in-phase carrier, and the projection on the Q coordinate is used to modulate the amplitude of the quadrature carrier, and then the two amplitude modulation signals are added to form the required phase modulation signal