In order to find the modulation with good band and power efficiency, the QAM is analyzed and simulated with Matlab, and it is compared with the PSK.

• 为了找到具备以上特性的调制方式；对正交振幅调制(QAM)作了理论分析和计算机仿真；并将其与移相键控调制(PSK)作了对比分析.