feature_selection

说明：  独立成分分析算法降低原始数据噪声，并提取特征值，非常有用得数据去噪程序。(Independent component analysis algorithm reduces the raw data noise, and extract characteristic value, is more helpful data denoising procedure.)

ch3=softt(h3,thr1 clear clc I=imread( lena512.bmp ) imshow(I) I=double(I) II=I+30*randn(size(I)) figure imshow(II,[]) [a1,h1,v1,d1]=dwt2(II, sym8 ) [a2,h2,v2,d2]=dwt2(a1, sym8 ) [a3,h3,v3,d3]=dwt2(a2, sym8 ) sigma=median(abs(d1(:)))/0.6745 x=3*sigma thr1=x*2^(-1) thr2=x*2^(-0.5) thr3=x 小波图像去噪( ch3=softt(h3,thr1 clear clc I=imread( lena512.bmp ) imshow(I) I=double(I) II=I+30*randn(size(I)) figure imshow(II,[]) [a1,h1,v1,d1]=dwt2(II, sym8 ) [a2,h2,v2,d2]=dwt2(a1, sym8 ) [a3,h3,v3,d3]=dwt2(a2, sym8 ) sigma=median(abs(d1(:)))/0.6745 x=3*sigma thr1=x*2^(-1) thr2=x*2^(-0.5) thr3=x )

信号的频谱分析函数，输入复信号，fft的长度和Fs，可以直接输出信号频谱图。(Signal spectrum analysis function, the input complex signal, fft length and Fs, can be directly output signal spectrum.)

信道仿真,小尺度衰落信道的MATLAB仿真源码（jakes仿真模型）(Channel simulation, small-scale fading channel MATLAB simulation source (jakes simulation model))

matlab对EXCEL进行操作，包含xlswrite函数和xlsread函数。(matlab for EXCEL operation, including xlswrite functions and xlsread function.)

直流有刷电机MATLAB模型(MATLAB model of DC brushed motor)

ofdm系统的matlanb仿真，包含星座图，加窗，误码率等，希望对大家有帮助(ofdm system matlanb simulation, including the constellation, adding windows, error rate, we want to help)

2003-2011年的全国大学生数学建模题目(2003-2011 subject of mathematical modeling)

These MATLAB programs in this directory belong to the book titled "MIMO-OFDM Wireless Communication with MATLAB㈢", which has been authored by Yong Soo Cho, Jaekwon Kim, Won Young Yang, and Chung G. Kang and published by John Wiley & Sons (Asia) Pte Ltd in 2010. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher.

该文介绍基于Matlab/Simulink进行雷达系统仿真的基本规范 ,开发了有关的雷达系统仿真模型库 ,并在该平台上对某脉冲多普勒雷达系统进行了仿真 ,给出了仿真结果和分析。(This paper introduces the basic specifications of the radar system simulation based on Matlab/Simulink, developed a radar system simulation model library, on the platform of a pulse Doppler radar system simulation, the simulation results and analysis are given.)