corner-analysis

Construct the short length of QC LDPC codes without girth 4 and girth 6(The Program to construct the short length of QC LDPC codes without girth 4 and girth 6 Copyright (C) Yang XIAO, Jun FAN, BJTU, July 26, 2007, E-Mail: yxiao@bjtu.edu.cn. This program presents an approach [1] for constructing the short length of LDPC codes with girth 8. First, we design 3 submatrices with different shifting functions given by our schemes, then combine them into a matrix according to our approach, finally, expand the matrix into a desired parity-check matrix using identity matrices and cyclic shift matrices of the identity matrices. The simulation results in AWGN channels show that the codes which can be obtained by the generator matrix derived from this check matrix for encoding the random information bits are as good as random LDPC codes [1]. Ref: [1] J. Fan, Y. Xiao, “A design of LDPC codes with large girth based on the sub-matrix shifting”, IET International Conference on Wireless Mobile and Multimedia Networks Proceedings (ICWMMN 2006), (CP525), p. )

光纤中光脉冲演化方程的数值解的计算机仿真研究(The fiber optical pulse evolution equation of the numerical solution of simulation research)

matlab code for Ncut segmentation algorithm

采样定理的验证，即采样信号的频率大于等于原信号频率的两倍时才能准确的恢复原信号(Verification sampling theorem, the sampling frequency of the signal frequency is greater than or equal to twice the original signal in order to accurately restore the original signal)

algorihtmo the ant metaheurist

电压电流负反馈的仿真程序，用matlab语言实现，经过测试可以运行(Voltage and current negative feedback of the simulation program, using matlab language, tested can run)

SAVEPPT(filespec,title,prnopt) saves the current Matlab figure window or Simulink model window to a PowerPoint file designated by filespec.(SAVEPPT (filespec, title, prnopt) saves the current Matlab figure window or Simulink model window to a PowerPoint file designated by filespec.)

基天子matlab的双缝干涉从单缝(线光源)发出的单色光射到与之平行的双缝上，即可在双缝屏后获得来自双缝(相干光源)的两束相干光在空间叠加，用光屏承接后可获得干涉图样(在一定范围内出现等间隔明暗相间的平行干涉条纹；用白光做实验则可获得彩色干涉图样)．如果能在计算机上模拟出来.对(Matlab-based emperor s double-slit interference from a single slit (line source) the issue of parallel monochromatic light reach the double-slit can be in the double-slit screen was from the double-slit (coherent light source) of two coherent light beam in the space superimposed with光屏available to undertake after the interference pattern (in a certain range interval appears parallel white light interference fringes experiments using white light interference pattern, they can get color). If we can come out on the computer simulation. On)

speech enhance matlab

说明：   计算群体感应模型的分叉图，直接描述模型随时滞变化的(Computing the bifurcation digram of quorum sensing and decribing the change with delay)