yietao

this program to help you in detection the edge of greylevel image

这是一个Matlab开发的数字波束形成源代码，仿真正确(This is a developed Matlab source code for digital beamforming, simulation correctly)

这是一个matlab的初学者的小算例，非常适合于初学者学习(This is a beginner' s small matlab example is very suitable for beginners to learn)

erpPCA可用于特征提取，是对pca的优化(erpPCA can be used for feature extraction, is to optimize the pca)

Decompose image into subbands (undecimated wavelet), denoise, and recompose again. fh = decomp_reconst_wavelet(im,Nsc,daub_order,block,noise,parent,covariance,optim,sig) im : image Nsc: Number of scales daub_order: Order of the daubechie fucntion used (must be even). block: size of neighborhood within each undecimated subband. noise: image having the same autocorrelation as the noise (e.g., a delta, for white noise) parent: are we including the coefficient at the central location at the next coarser scale? covariance: are we considering covariance or just variance? optim: for choosing between BLS-GSM (optim = 1) and MAP-GSM (optim = 0) sig: standard deviation (scalar for uniform noise or matrix for spatially varying noise) Javier Portilla, Univ. de Granada, 3/03 Revised: 11/04

实现了无线通信中需要使用的信道模型，分析各种模型下的输入信号后的仿真和分析(On the basis of the study in multi-path propagation theory, characteristics and mathematics models of wireless channels, and the analysis of references from both domestic and international realm, this thesis will generalize the detailed classification of wireless mobile communication channels, and the typical small-scale fading modules (Rayleigh fading and Rice fading), which the signals has encountered while transmitted in communication channels. )

homework 4 given to me by my lecturer enjoy

说明：  电离层射线追踪模型：计算射线在电离层中的传播路径(Ionospheric ray tracing model: calculating ray paths in the ionosphere)

用Matlab编写的功率谱估计，输入数据是100年太阳黑子活动记录，用周期图法、最大熵值估计（AR法及Burg法），画出信号功率谱进而算出太阳黑子活动周期。(Matlab prepared using power spectrum estimation, input data is 100-year record of sunspot activity, using periodogram method, the estimated value of maximum entropy (AR Law and Burg method), draw the signal power spectrum and then calculate the sunspot activity cycle.)

this is the Broyden s method for solving nonlinear system of equations