edgefold

用Arnold方法对图像进行置乱，目的使图像随机分布均匀(Arnold method using the image scrambling, the purpose of uniform random distribution of the image)

A program for computing the fast forier transformation (FFT).

How to Use This Book 1 2 Mathematical and Simulation Models in Business Economics 16 3 MATLAB and Simulink Design Guidelines 26 4 Importing and Reporting Your Data 53 5 Library Functions for Business Economics 83 6 Economic Impact Models 110 7 Fiscal Impact Models 137 8 Tax Revenue and Tax Policy 149 9 Regional Economics 164 10 Applications for Business 182 11 Business Valuation and Damages Estimatio

算术编码的Matlab实现，用于该编码的各种压缩、加密应用中，参考程序。(Arithmetic Coding program using Matlab.)

filename: rayleigh_fading.m function: rayleigh fading input parameters: multipath_ID (user, multipath) output parameters: envelope read files: no generate files: no call functions: no called by: wireless_UL, wireless_DL Execution Time: case 1: 29/100 Seconds(100 times called)(N=25) case 2: 4.4/100 Seconds(100 times called)(N=25) Sun Jianxun, Apr., 02, 2001

一个定时误差检测器的特性由其曲线来表征。误差检测灵敏度一般取误差检测器曲线在零定时误差附近的斜率。(The characteristics of a timing error detector is characterized by the curve. Error detection sensitivity generally take near zero timing error detector curve slope.)

OFDM仿真包括信号源,卷积码编码，交织，qpsk调制，IFFT，组帧，上采样，通过FIR滤波器 通过高斯信道，再经过低通FIR滤波器，下采样，拆帧，FFT，qpsk解调，接收数据；计算误比特率(OFDM simulation including the signal source, sampling convolutional encoding, interleaving, QPSK modulation, IFFT, frame,, through the FIR filter through Gauss channel, and then through the low pass FIR filter, sampling, demolition of frame, FFT, QPSK demodulation, the received data bit error rate calculation)

说明：  异步电动机直接转据控制系统中电流信号的AD转换，可直接用于工程项目中(direct asynchronous motor control system according to which the current signal AD conversion, can be used directly in projects)

基本的粒子群优化算法代码 开发环境matlab7.0(The basic particle swarm optimization algorithm code development environment matlab7.0)

通过步进频率技术实现二维信号的带宽合成，提高雷达信号的距离向分辨率。(Through the step frequency technology to 2 d signal bandwidth synthesis, improve the distance of the radar signal to the resolution. )