xiaobobao_tuxiang

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. )

已知观测数据为A+W(n)，其中A为直流信号，W为复高斯噪声，服从CN（0， ），在统计N次下，计算X的统计平均值 ，求T(x)= 的pdf：p(T(x)|H0)、p(T(x)|H1)。 H0： W H1： A+W (Known observation data A+W (n), where A is the DC signal, W is the complex Gaussian noise, subject CN (0,), N times in the statistics, the calculation of the statistical mean of X, find T (x) = a pdf : p (T (x) | H0), p (T (x) | H1). H0: W H1: A+W)

对frame1进行一个简化的帧内编码方案: A)将图像分为8x8的块. B)将图像每一块做DCT2变换. C)将DCT系数采用11.ppt page 35的亮度量化表量化. 量化系数 = 取整 (DCT系数./量化表). D) 统计整个图像中非零量化系统的比重, 该比重可反映什么? E) 将量化系数进行 IDCT2, 绘制出重建图像.(a example for matlab to deal with a picture)

Femtocell. Wireless communication introduction

This is power converter in matlab with no transformer. The full control is using. PID controller for the gating signal of SCR. The phase angle has been controlled

说明：  应用FFT对信号进行频谱分析 IIR数字滤波器的直接设计 窗函数法设计FIR滤波器 用双线变换法设计IIR滤波器(Application of FFT spectral analysis of signals directly to design IIR digital filter design FIR filter window function with a double transform IIR filter design)

matlab/simulink建的混合动力汽车制动回馈数学模型。可以根据速度与soc的大小判断是否进行回馈(Matlab/Simulink to build hybrid vehicles braking feedback mathematical model. According to the size of the judgment of the speed with the soc feedback)

MATLAB图片点的像素坐标（读入图片，点击就能显示像素坐标）(MATLAB image point in pixel coordinates (read pictures, you can click the display pixel coordinates))

基于matlab编程的叶片泵在过渡区中的升压梯度曲线，升压曲线。(Vane pump matlab programming voltage gradient in the transition region based curve, boost curve.)

利用双线性变换法设计Chebyshev高通滤波器，体会其性质和特点。(Bilinear transform Chebyshev high-pass filter design, understand the nature and characteristics.)