chapter-4

数字变频器仿真，能将信号的频率在一定范围内变频。(the stimulation of Digital Convert,which can change the frequence of signal )

说明：  基于德洛内三角分解的有限元划分，可形成刚度总阵(Delaunay triangulation based on decomposition of the finite element division, the total stiffness matrix can be formed)

传输线的工作状态波形，包括行波和驻波，当参数改变时，传输线的工作状态也因此而改变(The operating state of the waveform of the transmission line, including traveling wave and standing wave, when the parameter is changed, the working status of the transmission line can also be changed)

有两个程序一个是关于frft的源程序，一个是应用frft对线性调频信号进行检测的程序，原理是以变换阶数（不同的分数阶域）为变量对观测信号进行分数阶变换，形成信号能量在时频平面上的二维分布，在此平面上按阈值进行峰值点的二维搜索即可检测线性调频信号并估计其参数。(There are two procedures one on frft the source, one application frft linear FM signal detection process, the principle is to transform the order of (different fractional domain) as the independent variables on the observed fractional signal change, the formation of signal energy in two-dimensional time-frequency plane distribution in this plane, the peak threshold value by two-dimensional linear FM signal can be detected search and estimate its parameters.)

基于杂交的粒子群优化函数--借鉴遗传算法的杂交概念，在每次迭代中，根据杂交概率选取指定数量的例子放入杂交池中，里面的例子随机两两杂交，产生相同数目的子代例子(Hybridization-based particle swarm optimization functions- Reference hybrid genetic algorithm concepts, in each iteration, according to the selected crossover probability into a specified number of examples of hybrid pool, examples of which twenty-two random hybridization, the same number of offspring produced example)

This matlab code show the noise calculations in image like PSNR etc. Which helps in image processing projects.

control system block tool bar gives u more information LTI systems............

A study of the performance of LSE algorithm in OFDM channel estimation

matlab绘制图形完成后，在句柄窗口实现局部放大，通过鼠标键盘的操作来选择放大区域(matlab graphics rendering is completed, the handle of the window to achieve local amplification, through the operation of mouse and keyboard to select the magnified area)

ML estimation for linear regression model