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正交相移键控 (Quadrature Phase Shift Keying)简称“QPSK”，是一种数字调制方式。它分为绝对相移和相对相移两种。由于绝对相移方式存在相位模糊问题，所以在实际中主要采用相对移相方式DQPSK。目前已经广泛应用于无线通信中，成为现代通信中一种十分重要的调制解调方式。(QPSK THAT IS TO SAY....)

矢量水声信号的matlab仿真程序，里面包含文字说明与程序代码(Vector underwater acoustic signal matlab simulation program, which contains the text description of the program code)

如何使用MATPOWER,方便易懂,值得学习(How to use the MATPOWER, easy to understand, it is worth learning)

Automatic Gray-Scale Image Thresholding methods: Tsai, Prewitt, Rosenfeld, Otsu, Kittler, Ridler.

TCS 230 color sensor user guide.

U盘控制芯片CH331,CH331 是一个小容量U 盘的控制芯片，只要外加一个串行存储器芯片，就可以实现2KB 到512KB 的小容量U 盘。(U disk controller IC CH331, CH331 is a small-capacity USB control chip, As long as plus a serial memory chips, we would achieve 2 KB to 512 KB of small U disk capacity.)

随机信号谱分析 基于matlab 随机信号的频域谱分析 自谱 互谱 窗函数等 十分实用(Spectral analysis of random signals Matlab random signals based on spectral analysis of frequency-domain cross-spectral window function from the spectrum of other very useful)

matlab的文档，想要学习matlab的同学可以看看。(The people who wants to learn the Matlab well can download the PDF documents.)

这是有关遗传算法的，在学习工作中都很实用，尤其是数据分析的时候，相信会对大家有所帮助(This is the genetic algorithm, in study and work in very useful, especially when the data analysis, we believe it will help)

说明：  刘金锟先进PID第二版程序，需要的可以下载。(Liu Kun, the second edition of the advanced PID procedures needed can be downloaded.)