中文说明：多进制正交振幅调制M-QAM，是在中、大容量数字微波通信系统大量使用的一种载波键控方式。M-QAM是对载波的振幅和相位同时进行调制的一种复合的调制形式，它同时利用了载波的幅度和相位来传递信息比特，因此调制效率高，但要求传送信道的信噪比要高，特别适合诸如有线电视电缆的传输。因此数字有线电视传输标准中都普遍把它作为首选。本课题选择64QAM作为研究对象。
English Description：
M-QAM is a carrier keying method widely used in medium and large capacity digital microwave communication systems. M-QAM is a composite modulation form which modulates the amplitude and phase of the carrier at the same time. It uses the amplitude and phase of the carrier to transmit information bits at the same time, so the modulation efficiency is high, but the signal-to-noise ratio of the transmission channel is required to be high, especially suitable for the transmission of cable TV cable. Therefore, digital cable TV transmission standards generally take it as the first choice. 64QAM is selected as the research object.