chap4

一个原来绘制信号包络的函数，希望对大家有帮助(An original drawing signal envelope function, we want to help)

matlab离散系统仿真程序电子系课程设计(Department of Electronics, curriculum design of Matlab discrete system simulation program)

my other project cdma

基于最小二乘法和相关系数法的系统辨识方法(Based on the least squares method and correlation coefficient law system identification methods)

帧差法检测目标，简单适用，便于新手学习。(Homodyne detection target frame, simple to apply, easy to learn new)

simulation of communication systems and software defined radio from the book chapter 3

基于matlab的车牌识别，GUI图像显示，简洁明了，识别过程用的是模板匹配，文件齐全。(License plate recognition matlab-based GUI image display, concise, the identification process is the template matching, the file is complete.)

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. )

利用matlab自带的eig函数,对带非值二维场的eof分析(Using eig function in Matlab, eof for the two-dimensional field with some non-value data )

适用于matlab 的图形旋转代码，可自定义旋转角度，使用邻近插值不全图像(Applicable to matlab graphical rotation code, the rotation angle can be customized using the neighbor interpolation incomplete picture)