based-in-matlab-of-16QAM-modulation-

有关LFBG光纤光栅的matlab仿真编程(Related LFBG fiber grating matlab simulation program.)

对模拟信号抽样，然后进行离散傅里叶变换，利用自编DFT函数，得到频谱，然后进行频谱的还原。(Sampling the analog signal, then the discrete Fourier transform, DFT self function obtained spectrum and the spectrum reduction.)

系统辨识工具箱的参考说明，很有用，虽是英文的，但不难懂(Matlab System Identification Toolbox reference books)

This file is to optimize functions

K-means algorithm code matlab

Wavelet denoising For using this code need to use signal toolbox and general toolbox in your matlab In the first part of this assignment, we asked to obtain a (black-and-white) digital image of size 512 by 512 and then generate noisy image by adding a Gaussian noise but under the condition of having SNR=20dB by select the suitable value of variance for Gaussian noise formula. Second step is performing wavelet denoising using the hard thresholding (Use the db 6 for four levels) in the condition of finding the optimal thresholding value of T in terms of the SNR obtained. It means that, we should find the highest SNR value by finding the suitable value for threshold. Then we asked to do the same process but this time using soft thresholding. Finally for the last part of question one, we should compare the results of the obtained SNR with the recommendations of 3*sigma for the hard thresholding and 3/2*sigma for the soft thresholding.

说明：  利用邻域粗糙集进行属性约简，里面加入了8个数据集，有离散型数据，连续性数据，字母型数据。因此程序也加入了数据类型转换和归一化处理。程序函数在最下面部分。(using the neighborhood rough set to attribute reduction)

可实现鱼眼校正功能，主要包括有效区域的提取与鱼眼校正(The function of ROI extract and fisheye correction is written by matlab)

说明：  3.使用梯度的两次分水岭分割程序 可以实现相关功能(The use of gradient watershed segmentation of the two procedures)

Natural Gas Prediction Using The Group Method of Data Handling