信噪比，相对强度噪声对PAM4调制误码率的影响(Influence of signal to noise ratio on BER of PAM4 modulation)

此代码是用matlab软件仿真PAM4信号的传输，自动生成传输数据，在接收端做基本的信号处理，计算出误码率。(This code uses MATLAB software to simulate the transmission of pam4 signal, automatically generate the transmission data, do basic signal processing at the receiving

用matlab实现pam4信号发射机，普通信道，加上高斯白噪声(Realization of pam4 signal transmitter with MATLAB)

实现PAM4的光发射机，包括格雷编码、FEC、PAM4映射和PAM4解映射等，适合光纤通信学习者(The implementation of pam4 optical transmitter, including gray coding, FEC, pam4 mapping and pam4 demapping, is suitable for optical fiber communication learners)