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本文主要利用matlab编程工具对直接序列扩频通信的捕获过程进行仿真。仿真主要基于滑动相关法的有关理论,先讨论扩频仿真中起着重要作用的m序列的生成问题,尔后讨论调制信号的产生,然后在信号的捕获中分步讨论,先对捕获的流程进行简单的仿真,再依次加入噪声和多普勒频移后进行捕获仿真(In this paper, using matlab programming tools for direct sequence spread spectrum communication capture process simulation. Simulation of the sliding correlation method is based on the theory, first discuss the simulation plays an important role in spreading the m sequence generation problem, the modulation signal generation and later discussed, and the signal captured by stepping discussion processes the captured first simple simulation, and then followed by adding noise and Doppler frequency shift after the capture simulation)

it tells about nakagami channel

《MATLAB 高级应用——图形及影像处理》一书的附录部分，包括功能、语法、示例，已为各函数做好书签(MATLAB advanced applications- graphics and image processing, an appendix to the book, including function, syntax, examples, has been doing a good job for the bookmark function)

QAM系统蒙特卡罗仿真，高斯Q函数，误差计算，图形分析，实验要求(QAM system Monte Carlo simulation, the Gaussian Q function, error calculation, graphical analysis, test requirements)

说明：  关于通信系统仿真中的直序扩频序列的仿真系统的仿真问题的解决方法(Communication System Simulation on Direct Sequence Spread Spectrum Sequences simulation system simulation solution to the problem)

3 phase single switch uni directional boost converter

erikson chapter8 solved problems

仿真实现调制解调的过程,使用此程序需要MATLAB开发工具(Simulation of the process of modulation and demodulation, using this program requires MATLAB development tools)

说明：  伪随机码或称PN码，是扩频通信中不可缺少的一种序列。扩频通信，简单的说来就是通过一组相关性很强的伪随机序列，使原有的信号按照伪随机序列的特性出现。从波形上看，原有信号完全淹没于随机的噪声中，达到隐藏信号和抗干扰的目的。接受方只要有相同的伪随机序列，就可以通过伪随机序列很强的相关性将信号还原出来。而m序列，是扩频系统中最长用的伪随机序列。下面的代码就是基于matlab的生成m序列的代码，通过改变初始多项式的值，就可以生成不同阶数的m序列。(Pseudo-random code or PN code, spread spectrum communication is indispensable to a sequence. Spread spectrum communication, a simple to say that the adoption of a group of highly related to pseudo-random sequence, so that the original signal in accordance with the characteristics of pseudo-random sequence there. From the wave point of view, the original signal completely submerged in the random noise to hide the purpose of signal and interference. As long as the recipient has the same pseudo-random sequence, the pseudo-random sequence can be a strong correlation to restore the signal out. And m sequence spread spectrum system is the longest of the pseudo-random sequence used. The following code is generated based on m sequences of matlab code, by changing the value of the initial polynomial, we can generate a different order of the m sequence.)

Design and Implementation of Motor Control Systems with MATLAB, Simulink, and TI C2000™ DSPs