source

访问市场上流行的德卡公司的接触非接触读卡器程序(Access to the market the company' s exposure to the popular de non-contact reader program)

This document describes about the digital modulation techniques especially about spread spectrum.

电脑串口控制西门子s7-200程序，可以通过电脑直接控制PLC(Computer serial port control of Siemens S7-200 program)

简单地绘制BOC（1, 1）调制信号的功率谱密度及其自相关函数曲线，仅供参考。(Simple drawing BOC (1, 1) density and autocorrelation function curve of power spectrum of the signal modulation, for reference only.)

此代码通过随机生成二进制码，对其进行二进制差分调制，以及加入高斯白噪声后对其解调计算误码率，绘制出其输入信噪比与输出信噪比的实验曲线及理论曲线的比较。(This code generates binary codes randomly, modulates them by binary differential modulation, demodulates them with Gauss white noise and calculates the bit error rate, draws the experimental curve and theoretical curve of their input signal-to-noise ratio and output signal-to-noise ratio.)

说明：  Proteus 8051+LCD+PWM电机调速测速（仿真+源码）(Proteus 8051+LCD+PWM Motor speed measurement (simulation + source))

说明：  对数字信号进行相位幅度调制，并在接收端成功解调(QAM of Digital Signal and Successful Demodulation at Receiver)

控制TMS320-F28335 LED灯闪烁(TMS320-F28335 LED test)

通过共享内存的方式进行程序间的通讯. 本源代码提供通讯两端的代码，即发信端和收信端（在同一文件内）(programme communication with share memory)

PSK通信信号盲解调测试程序，final1_1和final1_2为两种不同的产生PSK通信信号的程序，final2_1预估计载波频率，final2_2预估计码元速率，final3进行载波同步，final4进行码元同步，进而解调出原信号。(PSK Blind Demodulation)