munjiu

A common garch model used in everywhere

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. )

LDA降维是常用的降维手段之一，其本质假设为数据的高斯分布。是有效常用的有监督学习降维工具。(LDA dimension reduction is one of the commonly used dimensionality reduction methods, and its essence is assumed to be the Gauss distribution of data. It is an effective and commonly supervised learning dimensionality reduction tool.)

说明：  Canny Edge Detector Algorithm and Matlab Codes

the introduction to matlab is lecture of MIT. it is very good for beginner(the introduction to Matlab is lecture of MI T. it is very good for beginner)

本文件详细描述了如何利用matlab代码去实现边缘的检测，hough变换检测图像几何形状时的边缘问题(This document describes in detail how to use matlab code to achieve edge detection, hough transform to detect the edge of the image geometry problem)

Video Game Theory to develop game

辅助粒子滤波程序，是对粒子滤波程序的改进(Auxiliary particle filter program, the program is to improved particle filter)

说明：  8，16，64进制的qam 星座图转换，MATLAB程序(8,16,64 qam constellation hex conversion, MATLAB program)

程序仿真得图为原信号与u律压扩信号的互补累积函数曲线图。仿真参数：子载波N=128，采用QPSK调制。(The photo shows the original simulation program was u-law signal and the signal of the complementary cumulative function expansion curve. Simulation parameters: sub-carriers N = 128, using QPSK modulation.)