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     多进制正交幅度调制,结合了幅度和相位两个要素,信号均匀分布,频谱利用率高。文中介绍了正交幅度调制解调原理,通过系统仿真实验,对16QAM的调制解调过程、原理进行了论证分析,给出了高斯白噪声干扰下的误码率。仿真实验结果说明了,多进制正交幅度调制解调功率、带宽高效,易于实现,误码率低,抗干扰能力强。 Multi-band quadrature amplitude modulation, combined with the amplitude and phase of the two elements, the signal evenly distributed, high spectral efficiency. In this paper, the principle of quadrature amplitude modulation and demodulation is introduced. Through the system simulation experiment, the modulation and demodulation process and principle of 16QAM are analyzed and analyzed, and the bit error rate under Gaussian white noise is given. Simulation results show that the multi - band quadrature amplitude modulation and demodulation power, bandwidth, efficient, easy to implement, low bit error rate, strong anti - interference ability.