ZF-Demodulator

将声音文件在时间轴上分割成几段，分别将段的秩序及某些段内的秩序颠倒，从而实现了对声音文件的加密。首先，先读取一个声音信号，对信号做1024点FFT变换，取完点之后，分成四个向量，四个向量组成一个矩阵，再对每一个向量进行转置，再重新整合，从而就实现了回密的过程。(Sound files on the timeline will be divided into paragraphs, each paragraph of the order and reversed the order of some paragraphs to realize the encryption of sound files. First, the first reading of a voice signal, the signal was 1024 points FFT transform, check after the completion point, divided into four vectors, the four vectors form a matrix, then for each vector transpose, re-integration, which will achieve a return to close the process.)

集总元件电阻、电感、电容的模拟，用不同大小的电感和电容加载，看天线的辐射方向图，从而分析加载天线的特性(Lumped resistance, inductance, capacitance of the simulation, using different sizes of inductors and capacitors to load to see if the antenna radiation pattern, to analyze the characteristics of the antenna load)

内有7位巴克码、13位巴克码的产生程序以及有两个目标时产生回波并对回波进行I/Q（正交）解调，并显示压缩后时域信号(There are 7 Barker code, 13 Barker code generation process, and generate two target echo and echo for I/Q (quadrature) demodulation, and display time-domain signal after compression)

说明：  matlab实现BP模型。注释明白直观，使用方便。(Matlab implements BP model. The notes are clear, intuitive and easy to use.)

有关Matlab课件，效果好值得借鉴，希望大家喜欢(On the Matlab software, the effect is worth learning well, I hope you like)

信道编码中的霍夫曼编码在matlab环境下的实现(Huffman coding)

说明：  创建bp神经网络，实现对车辆速度进行预测的matlab程序(Establish BP neural network to realize the matlab program of vehicle speed prediction)

详细的汉明码讲解及编程，本程序只适用传送语音信号等N*1维的矩阵数据，要是想传送灰度或者彩色图片，需要修改一下。(Hamming code in detail to explain and programming, this procedure applies only to transmission of voice signals, such as N* 1-dimensional matrix of data, if would like to send grayscale or color images, the need to make some corrections.)

比较BLAST_STBC_STTC三种空时编码方式性能(Comparison BLAST_STBC_STTC performance of three space-time coding)

基于Scilab的粒子群算法代码，Scilab是一个功能和matlab差不多的开源软件(Based on the Particle Swarm Optimization Scilab code, Scilab is a functional and open source software similar to matlab)