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This model shows the implementation of a QPSK transmitter and receiver. The receiver addresses practical issues in wireless communications, e.g. carrier frequency and phase offset, timing offset and frame synchronization. The receiver demodulates the received symbols and outputs a simple message to the MATLAB command line.

基于snell定律的射线追踪，与一般算法不一样，精度比较高(Based on Snell s Law ray tracing, and the general algorithms are not the same, relatively high accuracy)

地震ppp波射线追踪模拟，由matlab语言编写，是学习地震方面的好资料。(Ppp seismic wave ray tracing simulation, written by matlab language, learning good information earthquake area.)

求希尔伯特变换后的瞬时频率,经过信号的解析，反正切变换，求导得出(instant frequency)

A pv module is modeled in MATLAB/SIMULINK environment with use of mathematical equations that describe pv module s schematic model. This model has 2 inputs named Vpv and insolation and has 2 outputs named Ipv and Ppv. Insolation signal is varying.

大津算法的MATLAB代码，很好的代码值得做图像处理初学者参考(The Otsu algorithm MATLAB code, good code worth doing image processing beginners reference)

说明：  利用 matlab 分别基于 ACF 和 W-AMDF 求基音频率，程序均调试通过。其中的 word 文档为下载资源，供大家参考对比(compute fundamental frequency of speech signal base on ACF and W-AMDF respectively, while the download word document for your reference.)

说明：  脉冲响应不变法实现音频滤波功能，并且含有GUI界面设计，数字信号课程设计专用(Realization of audio filtering function with pulse response invariable method.)

小波构造MATLAB源程序代码，希望对大家有帮助！(Wavelet MATLAB source code for all of us want to help!)

锁相环和微分方法的介绍和matlab仿真步骤(Phase-locked loop and an introduction to the differential method and the matlab simulation steps)