psat2.1.8

基于直接扩频通信基础框架，在matlab程序下运行。基于直接扩频通信基础框架，在matlab程序下运行( Basic framework based on direct spread spectrum communication, running under matlab program. Basic framework based on direct spread spectrum communication, running under matlab program.)

不是matlab本身的小程序，自己编写的语音分帧程序供大家参考(Matlab itself is not a small procedure, I have written procedures for voice sub-frame reference to U.S.)

采用离散余弦变换DCT，通过MATLAB实现数字水印（包括水印的嵌入和盲提取）。( Uses discrete cosine transformation DCT, realizes the digital watermark through MATLAB (including watermark inserting and blind extraction). )

非线性系统线性化的相关材料,对学习非线性的朋友很有帮助.(nonlinear systems of linear related materials for the study of nonlinear helpful friends.)

二维变系数分数阶偏微分方程有限差分格式,拥有周期边界条件，和零初始条件(finite difference scheme for two-D fractional PDE)

a.阅读的图像img_1.tif，img_2.png的文件夹中，并 他们展示于一体，这两个数字分别。 （参考函数：imread, imshow, figure, subplot） b.在matlab，观察从工作区中的图像信息面板 c.分别使用size, imfinfo,whos等功能获得的图像信息 d.添加标题的图像。 （参考函数：title） Ë 。下面的代码实现的M文件编辑器 f=imread(‘img_1.tif’) imshow(f) set(figure(1), NumberTitle , off , Name , my first image’) 观察结果，并确定的功set() f。保存img_1.tif目录“D： imagetest”。如果该文件夹不 存在，请首先创建这个新的文件夹。 （参考函数：imwrite） (a. Read the images img_1.tif, img_2.png given in the folder, and show them in one and two figures respectively. (referenced function: imread, imshow, figure, subplot) b. In matlab, observe the images information from the workspace Panel c. Use size, imfinfo,whos,etc functions to obtain image information respectively. d. Add title to the images. (referenced function: title) e. Implement the following codes in the M-file Editor f=imread(‘img_1.tif’) imshow(f) set(figure(1), NumberTitle , off , Name , my first image’) observe the result, and determine the function of set() f. Save img_1.tif to the directory “d:imagetest”. If the folder does not exist, please create this new folder first. (referenced function: imwrite))

说明：  傅立叶采样数据生成程序，由matlab语言编写，并有详细注释(Fourier sampling data generation process, from matlab language and detailed notes)

偏移四相移相键控调制，也就是OQPSK，输出信号为OQPSK调制信号的复包络(Offset four-phase phase shift keying modulation, that is, OQPSK, the output signal for the OQPSK modulated signal complex envelope)

说明：  4阶经典龙格库塔格式解常微分方程y =f(x, y), y(x0)=y0 marunge4 用途：三阶样条插值（一阶导数边界条件）maspline(w)

说明：  数字基带传输系统仿真及性能分析 数字基带传输系统仿真及性能分析(matlab base system )