QAM调制解调的全过程，包括产生随机码，映射调制，加载波，进入信道，解调和判决，过程比较详细，其他调制方式也可以借鉴-QAM modulation and demodulation process, including the generated random code, mapping modulation, plus carrier, into the channel, demodulation and sentencing, the process in more detail, other modulation can also learn