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matlab code, discrete time processing vverlap and add example

Power Systems Debbs Solution

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 CalTy 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．)

可以对工程上测得的信号进行求奇异普熵，提取特征向量(Seeking singular Pu entropy, extracting a feature vector can be the signal measured in the engineering)

WiFi Direct直连，实现了直连，能正常检测链接，没问题(WiFi Direct Direct Connect, to achieve a straight, normal detection link, no problem)

基于matlab的水果分类识别，将图中水果进行识别(Matlab fruit-based classification, the fruit will be identified in Figure)

经典pso的matlab程序，只需修改适应值函数即可(Matlab program of classic pso matlab program.We simply can modify the fitness function can be)

GSM中GMSK调制信号的产生，这是一个好用的频偏估计算法的matlab仿真程序,迭代自组织数据分析。( GSM is GMSK modulation signal generation, This is a useful frequency estimation algorithm matlab simulation program, Iterative self-organizing data analysis.)

模拟退火算法，模拟退火算法来源于固体退火原理，将固体加温至充分高，再让其徐徐冷却，加温时，固体内部粒子随温升变为无序状，内能增大，而徐徐冷却时粒子渐趋有序，在每个温度都达到平衡态，最后在常温时达到基态，内能减为最小。(Simulated annealing algorithm, simulated annealing algorithm derived from the principle of solid annealing, heating the solid to the full high, let it slowly cooling, heating, the solid particles with the internal temperature rise to disorder symptoms, which can be increased, and slowly gradually cooling particles in an orderly manner, at each temperature to reach equilibrium, and finally at room temperature reaches the ground state, which can be reduced to a minimum.)

说明：  40节点39支路的配电网潮流计算。可计算网损和节点电压。(40 nodes with 39 branch power flow calculation. Calculate the net loss and node voltage.)