Visual_Cryptography

LEGClust算法更新，上次上传的代码发现有些问题，现已更正，A Clustering Algorithm Based on Layered Entropic Subgraphs(LEGClust algorithm update, last upload the code found in some of the problems have been corrected, A Clustering Algorithm Based on Layered Entropic Subgraphs)

本文在分析移动无线信道衰落特性的基础上,阐述了OFDM系统的基本原理,主要研究了OFDM通信系统中的基于导频符号的信道估计问题,分析了几种经典的信道估计算法以及相关的关键技术环节。 在此基础上介绍了OFDM技术在现实中的一个应用——WLAN IEEE802.11a系统模型,利用Matlab仿真软件完成OFDM系统信号生成、噪声生成、导频插入、循环前缀、调制、解调等部分的设计,最后结合计算机仿真对系统关键技术(导频、循环前缀、估计算法)的有效性和可行性进行了全面的分析与比较。适合matlab研究(Based on the analysis of mobile channel fading characteristics based on the OFDM system on the basic principles of research in the OFDM communication system of the pilot symbols based on channel estimation problem, an analysis of several classical channel estimation algorithm and the associated key technical links. On this basis, introduced OFDM technology in a practical application- WLAN IEEE802.11a system model, using Matlab simulation software to complete OFDM signal generation, noise generation, pilot insertion, cyclic prefix, modulation, demodulation and other parts of the design, the final combination of computer simulation of the system of key technologies (pilots, cyclic prefix, it is estimated that algorithm) the effectiveness and feasibility of a comprehensive analysis and comparison. Suitable for research matlab)

This is a MATLAB® instrument driver for use with v2.0 of the Instrument Control Toolbox™ and higher. It supports the Agilent E3647A power supply.

卷积码编码以及8PSK调制解调程序，卷积码编码采用（7,5）生成多项式的（2,1,3）编码结构(Convolution coding and 8PSK modulation and demodulation process)

对qpsk一个整体的仿真，从源信号的生成，调制，加载波，解调等，步骤清晰，与通用教材原理图逐步仿真而来(Qpsk simulation of a whole, the signal generated from a source, modulation, plus carrier demodulation step clarity, and general simulation of materials gradually from the schematic)

有限体积法求解一维欧拉方程，采用二阶MUSCL迎风格式，计算一维等熵喷管的流程，喷管扩张段有正激波。有助于理解和学习MUSCL格式()

BP神经网络作为若分类器，反复训练BP神经网络预测样本输出(As if the BP neural network classifier, repeated training samples of BP neural network output)

psk技术实现，并有详细的程序，有助于通信软件的开发(psk technology, and the detailed procedures, contribute to the development of communications software)

能够很好的实现hilbert变化，结果和matlab基本一样，已经通过实验。(Hilbert can achieve very good changes, results and basic matlab, as the experiment has passed.)

matlab 读取气象上的grib资料，包括插件和作为例子的程序(matlab read the grib weather information, including plug-ins and the program as an example)