此模块的基本功能是将待调信号与 M序列的每一位进行异或，到达扩频的目的。其中设计了一个5级的移位寄存器用于产生M序列。-The basic function of this module is the signal to be modulated with the M sequence of each XOR reach spreading purposes. Which designed a five shift register used to generate M sequences.

一个16QAM数字调制电路，包括时钟生成电路，m伪随机序列生成电路，串并转换电路，电平映射电路、载波信号发生电路、ASK幅度调制电路及加法器(A 16QAM digital modulation circuit, including clock generation circuit, m pseudo-random sequence generation circuit, serial parallel conversion circuit, level mapping circuit, car