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介绍了数字通信中的QPSK调制解调的原理，通过用Matlab编写脚本程序对QPSK通信系统的发射和接收过程的具体实现进行模拟仿真，绘出信号在理想信道和加噪信道中模拟传输时的时域图，并对各模块进行了频谱分析，所得到的结果与理论基本相符，对于理解QPSK系统的性能并在系统的实际应用上作进一步的设计，提供了有效的参考依据(The introduction was done with the principle of the QPSK modulation and demodulation in digital communications, a script was written by using Matlab program to carry out a simulation of the QPSK communication system ,which contains the concrete realization of transmit and receive process. The time-domain diagram is drew separately when the signal transmits in the ideal channel and in the channel with noise, spectral analysis of each module is also done, the results obtained with theoretical results in the main, which provides an effective frame of reference for understanding the performance of QPSK systems, and the practical application in the system to make further designed.)

用此程序中您可以控制鼠标并单击或双击您想要的位置，而不必鼠标！这些项目有利于教学软件。这些程序中还用到C库！(With this program you can control mouse and click or double click anywhere you like without touching mouse ! also upload keyboard_simulation for controlling keyboard without touching it ! These programs is good for teaching softwares. In these programs c library is used ! )

本程序利用matlab实现2维栅格地图建模，调试成功，有兴趣的可以下载(This procedure using matlab to achieve a two-dimensional grid map modeling, debugging success, interested can download)

卡尔曼滤波的国外论文，详细讲述了卡尔曼滤波的提出背景，以及应用场合，是卡尔曼那滤波的经典论文(kalman filter )

说明：  BPSKD Matlab Code for simulation in Matlab

线性方程直接解法的matlab程序，可作为数值分析等的学习工具。(The direct solution of linear equations matlab program, can be used as numerical analysis , and other learning tools.)

K近邻法的matlab程序，发现大家都在找它！(K-nearest neighbor method of Matlab procedures, I found that we all have to find it!)

关联维计算程序，以GP算法为主，计算2范数(Correlation dimension calculation program for GP-based algorithm to calculate the 2-norm)

《PID Controller Design》PID控制器设计的经典教程，内涵大量实例(《PID Controller Design》)

<空间谱估计理论与算法> 信号源个数估计 AIC MDL HQ 算法(spatial spectrum estimation source number estimation AIC MDL HQ)