对16QAM调制方式软解调，我们分为以下几个步骤进行：

⑴产生取值为0、1的随机数，作为16QAM调制的输入二进制序列；

⑵根据16QAM的星座图，按照输入序列分为I和Q两路进行映射，定义映射规则为00 －3，01 －1，11 1，10 3；

⑶产生一组高斯白噪声序列并分别叠加到映射后信号的实部、虚部；

⑷进行软解调。

-Soft demodulation of 16QAM modulation, we divided into the following steps: (1) to produce values ​ ​ for the 0,1 random number, and 16QAM modulation of the input binary sequence　(2) according to the 16QAM constellation, according to the input sequence is divided into I and Q, two-way mapping, define the mapping rules for 00-3,01-1,11 1,10 3　(3) generate a set of white Gaussian noise sequence and were superimposed on the signal mapping the real part and imaginary part　(4) conduct soft demodulation.