5-chapter

说明：  本程序用matlab实现了求不规则图形的最小外接矩形和最大内接矩形，实验用的图形也附在了文件中，可直接运行(This matlab program graphical the irregular circum-rectangle minimum and maximum inscribed with rectangular, experiment graphics attached the documents and can be directly run)

this document is a project documentation perfomed in matlab

这是我在通信原理课程设计中自己做的程序，是关于数字调制中几个方法的画图与各自的误码率分析(包括画图），供大家参考(This is my design in the communication theory course do their own procedures, several methods of digital modulation in the drawing and their error rate analysis (including drawing), for your reference)

主要用途是对抗多径衰落。由于多径衰落的存在，使得同一个帧由于路径不同，到达用户端的时延有先有后。在相关的频域上的会造成子载波之间的相互干扰，影响 性能。另外，由于有了循环前缀，使得IFFT FFT操作把原来的线性卷积变成循环卷积，大大简化了相应的信号处理复杂度(The main purpose is to fight against multipath fading. Due to the presence of multipath fading, the first after they have the same frame different paths to reach the client delay. Would cause mutual interference between sub-carriers in the frequency domain, affecting performance. In addition, thanks to the cyclic prefix, so IFFT FFT operation to the linear convolution of the original into a circular convolution, greatly simplifying the corresponding signal processing complexity)

File with compression factor of the particle swarm algorithm, the weight to improve particle swarm optimization, adaptive weighting method, the random weighting method, particle swarm optimization variable learning factor, learning factor of asynchronous change, the second-order particle swarm optimization, second-order oscillating particle swarm algorithm, chaotic particle swarm optimization, hybrid particle swarm optimization, hybrid particle swarm optimization, simulated annealing algorithm

介绍了数字通信中的QPSK调制解调的原理，通过用Matlab编写脚本程序对QPSK通信系统的发射和接收过程的具体实现进行模拟仿真，绘出信号在理想信道和加噪信道中模拟传输时的时域图，并对各模块进行了频谱分析，所得到的结果与理论基本相符，对于理解QPSK系统的性能并在系统的实际应用上作进一步的设计，提供了有效的参考依据(The introduction was done with the principle of the QPSK modulation and demodulation in digital communications, a script was written by using Matlab program to carry out a simulation of the QPSK communication system ,which contains the concrete realization of transmit and receive process. The time-domain diagram is drew separately when the signal transmits in the ideal channel and in the channel with noise, spectral analysis of each module is also done, the results obtained with theoretical results in the main, which provides an effective frame of reference for understanding the performance of QPSK systems, and the practical application in the system to make further designed.)

source code for OCR in matlab using NN

synopsis on speaker recognition

多基站雷达距离和多普勒分辨率；距离模糊函数；多普勒模糊函数(Range and Doppler resolution functions Range ambiguity functions Doppler ambiguity functions)

matlab超强的数值计算和图形处理能力，模拟最简单的简谐运动问题。M文件。(matlab the superior numerical computation and graphics processing power, analog easiest free fall. M-file.)