package_emd

这里面有两个程序，两个都是采用4QAM调制。不过个人觉得第一个更容易懂，因为写的很有条理。我改的那个程序就是根据这个来的。 不过在这里面有个问题就是信道系数只能是由高到低，大家可以试试，改成[0.227 0.46 0.688 0.46 0.227]这个是老师给我的仿真中常用的信道系数，这个成为归一化信道，就是系数平方和为1. 第二个程序没有涉及到信道系数，但是这个程序当中，在128个子载波中，前后有32个空载波，这个在OFDM中也是经常用的，这样可以降低误码率。 (And there are two programs, two are based on 4QAM modulation. But personally feel that the first is easier, because the writing is organized. I changed that procedure is based on the past. However, there is a problem in that there is only channel coefficients from high to low, we can try and change into [0.227 0.46 0.688 0.46 0.227] This is the teacher gave me the simulation channel coefficient commonly used, this became normalized channel, is coefficient of the square and is 1. The second program is not related to channel coefficients, but this program which, in the 128 sub-carriers, the before and after the 32 air carriers, the in OFDM is also often used, which can reduce the error rate.)

现代通信系统（实用MATLAB)第二章程序(Modern communication systems (useful MATLAB) Chapter II procedure)

MATALB code to extract features from EEG signal

基于MATLAB的风险价值VAR计算，包含蒙特卡洛模拟等相关源码。(MATLAB VAR calculation )

这个程序能够降低OFDM的PAPR，是一个初始的程序，在这个基础上可以根据需要有很多改进(Reducing the Peak-to-Average Power Ratio of Multicarrier Modulation by Selected Mapping)

说明：  关于fft的相关问题都有``````` 1111111111111111(Some promblem about fft.```````111111111111``)

关于小波的matlab四种变换，研究小波应用的很需要(on four Matlab wavelet transform, the application of wavelet research is needed)

Simple GPS Simulation with RINEX Data

this file is about band structure of 3d photonic crystal.in this program we use the pwe methode for calculation of band structure

MATLAB中的语音信号分帧， 语音分析中的窗函数， 语音信号短时时域处理， 语音信号短时频域处理(MATLAB voice signal framing, Voice analysis window function, Short time-domain speech signal processing, Short speech signal in the frequency domain processing)