xiaozhenqi

This is the demodulation for EPSK modulation technique

最经典的算法，LBG算法，其计算量大，可在进一步改进得到更好的效果(The most classical algorithm, LBG algorithm, the calculation volume can be further improved to get better results)

non local mean filter commande example I =mat2gray(imread( eight.tif )) mn= 0 vr= 0.02 J = imnoise(I, gaussian ,mn,vr) add noise output=NLmeansfilter3(J,7,3,0.1)

一个OFDM符号128个有效符号，插入128个虚拟子载波 符号率（即有效数据率）fsymbol，而发送速率（需要包括虚拟子载波）2fsymbol 输入的数据需要2倍的发送数据率，以便进行内插，实现位定时跟踪，即4倍fsymbol采样率的调制信号 OFDM symbol Nfft=128 points 一个OFDM符号数据点 Nfft*2 = 256 ， Guard Interval点 ＝Ng*2=64 ( a OFDM symbol 128 effective symbols, insert 128 virtual sub-carrier symbol rate (i.e. valid data rate), and fsymbol sending rate (need to include virtual sub-carrier) 2fsymbol input data need 2 times the sending data rate for interpolation, realize a timing tracking, namely fsymbol sampling rates four times the modulation signal OFDM symbol Nfft = 128 points a OFDM symbol of data points Nfft* 2 = 256, Guard Interval point = Ng* 2 = 64 )

Drop-Dead Simple Monte Carlo Codes 数个文件啊 好东西(Drop-Dead Simple Monte Carlo Codes several documents ah good things! !)

modulation en quadrature QAM

This program simulates the bit-error-rate (BER) performance of OSTBC with L=4 antennas over the frequency flat Rayleigh block fading channel The code is developed for real orthogonal design, code rate 1/2 modulation- 16 QAM with gray coding resulting in 2 bits/sec/Hz.(This program simulates the bit-error-rate (BER) performance of OSTBC with L = 4 antennas over the frequency flat Rayleigh block fading channel The code is developed for real orthogonal design, code rate 1/2 modulation-16 QAM with gray coding resulting in 2 bits/sec/Hz.)

this is a brain image

基于matlab实现SIFT算法,好用！！(Based on matlab realize SIFT, easy to use! !)

这是很实用的一个matlab的录音界面小程序，经行语音录制，分析等。(This is a very useful little program matlab recording interface, the line of voice recording and analysis.)