shortestpath

codings for fiber optics

Channel estimator with SFBC

nlms算法的实验，仿真，在白噪声下的情况(nlms is simulated on matlab)

一个学习电磁波时域有限差分法的程序 适合初学者(a code for studying finite difference time domai9n method for elctromagnetic waves )

Description All the filters have needed neighbor data the current pixel in the image,here this function(res_window=cover_window(how many neighbor value for row ,how many neighbor value for column ,input image) produce the result( res_window(row,col,total size)) input inp_img=2d data(row * col) w=cover size w=[3 3] = 3x3 cover pixel generation output o_img=result 3d o_img(w(1),w(2),r*col) if inp_img=[1 2 3 4 5 6 ] w=[3 3] Soloution it will construct new image new_img=[0 0 0 0 0 0 1 2 3 0 0 4 5 6 0 0 0 0 0 0] result o_img(:,:,1)=[0 0 0 0 1 2 0 4 5] o_img(:,:,2)=[0 0 0 1 2 3 4 5 6] finally o_img(1:3,1:3,6) example a=imread( pears.png ) b=rgb2gray(a) c=cover_window( b,[3 3]) 3x3 window construction

对信号进行小波包分解，得出能量分布图，然后根据分解结果处理信号！(Wavelet packet decomposition of signals obtained energy distribution and signal processing based on decomposition!)

Good practical guide to Matlab

用matlab写的经验模式分解程序。可作希尔伯特-黄变换，画时频图。(Empirical mode decomposition process Written by matlab .It Can be used for Hilbert- Huang Transform and time-frequency analysis.)

说明：  对高斯光束在不同位置的光强分布进行模拟仿真，主要是光腰和焦点位置(The intensity distribution of Gaussian beam in different positions is simulated, mainly in the waist and focus position)

实现快速傅里叶变换，自编函数FFT.而不需使用matlab自带的FFT函数(it can realize the fast fuleir tansform)