EM

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. )

采样点分别为16和256时的频谱和高分辨频谱分析图(Sampling points 16 and 256 respectively when the frequency spectrum and high-resolution spectrum analysis chart)

This is the file mmasub.m(This function mmasub performs one MMA-iteration, aimed at solving the nonlinear programming problem)

time series prediction use ANN

产生一个中频正交的信号，叠加有载频信号，能提出载频并对其解调(Generate an IF quadrature signal, the carrier frequency signal is superimposed, can raise the carrier frequency and demodulating)

this is implementation huffman algorithm,you must try code. i think you must try.

Koch等人最新的注意力选择算法matlab工具箱2006版(Toolbox code of Attention Selection model by Koch 2006)

10年全国大学生数学建模全国特等奖的源程序代码大全。(MATLAB)

说明：  详细介绍matlab的函数工具及其使用方法(Detailed introduction matlab function tool and its use)

说明：  直流电机启动模型，自己做的，可以交流作业用(dc start)