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关于OFDM的调制仿真，其中使用是QPSK调制，包含FFT、循环前缀、加窗等基本过程。(OFDM modulation on the simulation, in which a QPSK modulation, contains the basic process FFT, cyclic prefix, windowing and so on.)

Md5 matlab source code

三相光伏逆变并网的仿真，本科毕设要求参见标准测试模型，自写曲率计算函数 。( Three-phase photovoltaic inverter and network simulation, Undergraduate complete set requirements refer to the standard test models, Since writing the curvature calculation function.)

说明：  最速下降法是迭代法的一种,可以用于求解最小二乘问题(线性和非线性都可以)。在求解机器学习算法的模型参数，即无约束优化问题时，梯度下降（Gradient Descent）是最常采用的方法之一，另一种常用的方法是最小二乘法。在求解损失函数的最小值时，可以通过梯度下降法来一步步的迭代求解，得到最小化的损失函数和模型参数值。反过来，如果我们需要求解损失函数的最大值，这时就需要用梯度上升法来迭代了。在机器学习中，基于基本的梯度下降法发展了两种梯度下降方法，分别为随机梯度下降法和批量梯度下降法。(The steepest descent method is a kind of iterative method, which can be used to solve the least squares problem (both linear and nonlinear). In solving the model parameters of machine learning algorithm, that is, unconstrained optimization, gradient descent is one of the most commonly used methods, and the other is the least square method. When solving the minimum value of loss function, the gradient descent method can be used step by step to get the minimum value of loss function and model parameters. Conversely, if we need to solve the maximum value of the loss function, then we need to use the gradient rise method to iterate. In machine learning, two kinds of ladders are developed based on the basic gradient descent method)

3机9节点系统PSS&TCSC比例积分控制器布点(3 machine 9-bus system PSS & TCSC distribution proportional-integral controller)

此函数为多径信道的仿真函数，非常不错的函数，有需要的请下载。(This function is multi-path channel matlab function, a very good program, there is a need for download.)

伪Wigner-Ville分布对实验采集外圈故障的振动信号进行分析，看出信号存在故障引起的冲击分量(The pseudo Wigner-Ville distribution is analyzed to the vibration signal of the outer ring fault, and the impact component caused by the signal is found.)

说明：  针对NL-Mreans算法运算时间较长的问题，提出了优化，大大缩短了时间。(To solve the problem of long operation time of NL-Means algorithm, an optimization method is proposed, which greatly shortens the time.)

QPSK传输系统在随机高斯信道和瑞利衰落信道下的误码率计算。(QPSK transmission system in the random Gaussian channels and Rayleigh fading channel bit error rate.)

《MATLAB/Simulink建模与仿真实例精讲》第5章相关例子程序，可以运行。(" MATLAB/Simulink modeling and the simulation example 精讲" Chapter 5 example program can run.)