Signal_and_Systems_Lab_1

用于计算标准化降水指数，广泛用于气象等行业(Used to calculate the standardized precipitation index, widely used in meteorological and other industries)

说明：  here i have attached teh 2d fdtd codes sample codes

关于说话人识别的matlab源程序，另外还包括关于系统各个模块的说明(On Speaker Recognition Matlab source also includes instructions on the various modules of the system)

这个主要是提取特征之后利用LDA线性分析来进行多类分类，采用一对多策略。本例中是有六个类别(multiple patterns recognition using LDA, which is about one-vs-rest)

PSO OPTIMIZATION, THIS FILE CONTAINS PARTICLE SWARM OPTIMIZATION ALGORITHM IN MATLAB AND SOME BENCHMARK FUNCTIONS FOR TRY IT

在相控阵基础上，每个阵元增加一个小的频偏形成的频率分集阵列方向图(the pattern of frequency diverse array)

基于高斯混合模型和EM（Expectation Maximization）算法的SAR影像变化监测算法，并附带示例。总体思路是首先将两个时期的SAR影像做log和ratio运算，生成差分影像，然后通过EM算法估计高斯混合模型的参数，最后根据高斯混合模型最大概率，生成变化监测结果。(Unsupervised change detection method for SAR images using EM algorithms of Gaussian mixture model)

这是使用RBF进行分类的matlab代码(This is done using RBF classified matlab code)

说明：  利用双边滤波器实现图像的去噪处理，BF是一种有效的边缘保持滤波器，可以获得较好的去噪效果。(The image denoising is realized by using bilateral filter. BF is an effective edge preserving filter, which can obtain better denoising effect.)

OFDM信道估计代码，通过LMMSE估计、LS估计、SVD估计进行研究。并通过MATLAB仿真平台进行仿真，对三种信道估计算法及它们的性能进行了仿真分析和比较。(OFDM channel estimation)