xiaobobaochengxu

Reconstruction of magnetic resonance images from data not falling on a Cartesian grid is a Fourier inversion problem typically solved using convolution interpolation, also known as gridding. Gridding is simple and robust and has parameters, the grid oversampling ratio and the kernel width, that can be used to trade accuracy for computational memory and time reductions. We have found that significant reductions in computation memory and time can be obtained while maintaining high accuracy by using a minimal oversampling ratio, from 1.125 to 1.375, instead of the typically employed grid oversampling ratio of two. When using a minimal oversampling ratio, appropriate design of the convolution kernel is important for maintaining high accuracy

本人的毕业论文的PPT。关于图像标注的。使用GMM和CCA做的。(My thesis PPT. Marked on the image. Using GMM and CCA do.)

this file is about APSARA algorithm

this code generates transient signal

经典窄带信号含有两个干扰源，最后绘制方向图(Classic narrowband signal contains two sources of interference, the pattern drawn last)

讲述通信系统仿真的基本知识，包括基带数字传输和带限信道的数字传输的内容(Basic knowledge about the communications system simulation, including baseband digital transmission and digital transmission band-limited channel)

It includes coding for walsh code encoding in matlab.The Walsh functions can be generated (or computed) by many methods. We can construct the Walsh functions by: • Using Hadamard matrices • Exploiting the symmetry properties of Walsh functions themselves. • The Hadamard matrix is a square array of plus and minus ones, {+1, -1}, whose rows and columns are mutually orthogonal

是学习matlab的很好程序资料 可以用来方便计算潮流程序 (Matlab is a good learning process can be used to facilitate the procedures for calculating the tide)

直接序列扩频（Direct Sequence Spread Spectrum）工作方式，简称直扩方式（DS方式）。就是用高速率的扩频序列在发射端扩展信号的频谱，而在接收端用相同的扩频码序列进行解扩，把展开的扩频信号还原成原来的信号。(irect Sequence Spread Spectrum (Direct Sequence Spread Spectrum), hereinafter referred to as Direct expansion mode (DS). Is a high rate of spread spectrum sequence extension in signal spectrum, and at the receiving end with the same spread spectrum code sequence for expansion, the expansion of the spread spectrum signal back into the original signal. )

说明：  微型光伏并网逆变器，具有MPPT功能，采用推挽式电路，以及全桥spwm逆变，额定功率300w(this model is a micrc PV integration model with MPPT function)