STC12C5A60S2/AD/PWM系列单片机是宏晶科技生产的单时钟/机器周期(1T)的单片机，是高速/低功耗/超强抗干扰的新一代8051单片机，指令代码完全兼容传统8051,但速度快8-12倍。内部集成MAX810专用复位电路,2路PWM,8路高速10位A/D转换(250K/S),针对电机控制，强干扰场合。 1.增强型8051 CPU，1T，单时钟/机器周期，指令代码完全兼容传统8051； 2.工作电压：STC12C5A60S2系列工作电压：5.5V-3.3V（5V单片机）STC12LE5A

all right with the prsentation of CDMA optic in futur communication

Perform base band QPSK modulation of a bit stream: (a) without using in-built function, (b) using in-built function. Pass it through an AWGN channel and plot SNR versus BER of the received signal.