DSP-LAB

arnold cat 映射实验，观察其迭代次数与置乱效果的关系，这是图像加密的典型算法(arnold cat mapping experiments to observe the number of iterations and the scrambling effect relationship, which is a typical image encryption algorithm)

FDTD仿真喇叭天线，能观察得到其电场在自由空间随时间的分布情况。(FDTD method is a time domain analysis.Here we first we design a wave-guide and there after we just increase its broad side.Our aim is to this simulation is plotting its electric field response with time and how will it response in outside free space. Here we just take 170 time steps one who can interested in antenna designing they can also plot the radiation pattern of this HORN antenna.Just take the field in the outside the mouth of HORN antenna and there do the simple formula to near filed far field transfer and measure it at your band of antenna.Best of LUCK all of you.)

LMS: Least Mean Square the source code for state space environment.

matlab标准遗传算法 优化函数为f=-(x-1)^2+4，其中，0<=x<=3(matlab)

线性调频信号短时傅里叶变换 线性调频信号短时傅里叶变换 (chirp signal stft chirp signal stft chirp signal stft)

说明：  导出立方非线性器的复低通等效模型,对带通模型和LPE模型进行仿真(Export control of complex cubic nonlinear low-pass equivalent model of band-pass simulation model and the LPE model)

本程序是计算深海远场情况下的声源定位，首先要编译海洋环境文件（包含阵元信息），利用Krakren程序计算本征函数和本征模态，再利用本程序的子程序计算拷贝向量，然后合成声源信号，最后根据匹配场的程序进行匹配定位，由于数据量比较大，计算区域如果选的比较大的话，计算时间就比较长，酌情选择。(This procedure is to calculate the far-field sound source localization in case of deep sea, we must first compile the marine environment file (containing the array element information), use Krakren program to calculate the intrinsic function and the intrinsic mode, and then use a subroutine to copy the program to calculate the vector then synthesized excitation signal, the final match to locate the matching field program, because a large amount of data to calculate the area if the election is relatively large, the calculation time is relatively long, discretionary selection.)

说明：  function [Sx,f,alpha] = Sa(s,fs,M,N,read_f,del_f) 计算信号的循环谱 [Sx,f,alpha] = Sa(s,fs,M,N,read_f,del_f) 输入： s 序列 fs 采用频率 M 滑动频率窗长 N fft计算点数 read_f 可视频率（一般为载频的整数倍） del_f 可视频率间隔 输出： Sx 信号的循环谱 f 频率轴 alpha 循环频率轴(Cyclosationary Spectrum)

matlab仿真,超宽带信号中,等概率二进制产生,重复码编码,th编码,PPM-TH调制,脉冲形成器,PPM-TH发射器等源程序.(matlab simulation, ultra-wideband signals, such as the probability of binary generation, duplicate coding, th coding, PPM-TH modulation, pulse forming device, PPM-TH transmitters, such as source code.)

this file is about beam forming with adaptive file