单、双极性归零码仿真; AMI码和HDB3码仿真; 采用2DPSK调制的数字通信系统(Single and double polarity return zero code simulation; AMI code and HDB3 code simulation; Digital communication system using 2DPSK modulation)

双极性归零码程序，需要自己修改一下双极性归零码程序(Bipolar return to zero code program, we need to modify the bipolar zero code program.)

双极性非归零码和双极性归零码的功率谱密度(nrz and rz 's power)