Lightning

adaptive huffman coding and decoding in matlab..

Program of publication "Fast Channel Shortening with Polynomial Weighting Functions" contient 3pg of fig4,5and6

说明：  原创_proney算法，现代谱估计的一种，在信号处理中应用广泛(Original _proney algorithm, a kind of modern spectral estimation, is widely used in signal processing)

先随机找寻一个合理的初始划分，然后试探将样本从一个群搬到另一个群，如果某次搬动能使准则函数值得到改进的话，则继续搬运，否则废除本次搬运，再继续其他搬运。(Randomly and find a reasonable initial division, and then test the sample from a group of moving to another group, if a move can make the criterion function is worth to improve, it continues to handling, otherwise the abolition of the handling, continue to other handling.)

说明：  EEMD将特殊幅值下的高斯白噪声引入到分解的过程，可以消除上包络和下包络之间存在的拟合误差，从而很好地避免不同尺度下IMF的模态混叠现象，(EEMD can eliminate the fitting error between the upper envelope and the lower envelope by introducing the Gaussian white noise with special amplitude into the decomposition process, so as to avoid the mode aliasing of IMF at different scales,)

说明：  仿真入射到理想导体平板的情形，边界为PML吸收边界，观察电磁波反射过程(Simulate the case of incident to the ideal conductor plate, the boundary is PML absorption boundary, observe the electromagnetic wave reflection process)

多项式提取一个数组或是曲线的趋势项 得到一个多项式表达式 以及拟合的新数组(Extract an array of polynomial curve or a polynomial trend item to get a new array of expressions and fitting)

说明：  用matlab程序仿真QPSK系统中调制、解调，懂得QPSK通信系统的真正内涵(QPSK simulation with matlab program system modulation, demodulation, QPSK communication system to understand the real meaning of)

Comparacion del BER de un canal AWGN y Rayleigh en matlab. 100 bien

This program code is used for compressing a content or image using LZW compression methods.