simulation

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.)

DMCmatlab实现，方法有效，有详细说明，欢迎分享。(DMCmatlab realization, the method is effective, and have the detailed instructions, welcome to share. )

说明：  sift算法在matlab代码。对学习sift算法有很大帮助(sift algorithm in matlab code. Sift algorithm for learning a great help)

ber for mrc for bpsk . simply can add other modulation techniques

SVPWM异步电机矢量控制模型，适合初学者学习的异步电机矢量控制模型(Vector control model of SVPWM asynchronous motor)

filter for image de-noising

本程序针对信号检测与估计中极大极小化准则的仿真，画出贝叶斯风险曲线、极大极小化风险等，帮助大家更好理解极大极小化准则。(This procedure for signal detection and estimation of the minimax criterion simulation, draw the Bayesian risk curve, greatly minimizing risk, to help you better understand the enormous minimization criterion.)

使用matlab软件对信号去噪处理，并显示出图像。(The use of MATLAB software for signal denoising, and display the image.)

This functions models the pression profile with height

地球物理领域地震波在随机介质中的多次散射波，采用解析解模拟。经典的Foldy 方法(Geophysics seismic waves in random media multiple scattering waves, using analytical solution. The classic Foldy method )