qanben

基于S变换的短时电能质量扰动检测方法，从S变换的结果S模矩阵及S复矩阵中提取出所需数据并以此来对各种扰动情况下的电压暂降的幅值、相位跳变、持续时间和谐波含量进行分析(Disturbance detection method based on the results of short-term power quality S transform from S Mode S transform matrix and complex matrix S to extract the required data and use it to various disturbances in case of voltage dips in amplitude, phase jump variable, duration and content of harmonic analysis)

This matlab code is to make understand the concept of space time block codes in mimo wireless communication system

说明：  利用最速下降法可以求得非线性方程的最优解，运算过程简单易懂。(By using the steepest descent method, the optimal solution of nonlinear equation can be obtained, and the operation process is simple and easy to understand.)

有关MATLAB基础教程的程序，希望对下载的人有所帮助。(based on MATLAB Guide to the procedure, hoping to download the help.)

在不考虑时滞的条件下，建立PH中和过程的数学模型，利用反S变换和线性PI控制器对其进行控制仿真实验。(Without considering the delay conditions, establish mathematical models of PH in the process ,and anti-S-transform and linear PI controller is used to simulater control performance in matlab.)

Particle Filter的matlab仿真(Particle Filter matlab simulation)

利用SVM做回归线性测试。对于大盘指数的有效预测可以从整体上观测股市的变化提供强有力的信息，所以对上证指数的预测很有意义。通过对上证指数从1990.12.20-2009.08.19每日的开盘数进行回归分析，最终拟合的结果是：均方误差MSE=2.35705 e-005，平方相关系数 R=99.9195 。SVM的拟合结果还是比较理想的。(Make use of SVM linear regression testing. For the market index can predict the observed changes in the stock market as a whole to provide a strong information, so it makes sense to predict the Shanghai index. Through the Shanghai Composite Index opened daily from 1990.12.20-2009.08.19 number of regression analysis, the results of the final fit are: mean square error MSE = 2.35705 e-005, the square of the correlation coefficient R = 99.9195 . SVM fitting result is quite satisfactory.)

This program includes: [5 7] convolutional code (encoder) + BPSK + AWGN + MAP (decoder). It evaluates Bit Error Rate and plots it versus SNR(signal to Noise Ratio). (This program includes: [5 7] convolutional code (encoder)+ BPSK+ AWGN+ MAP (decoder). It evaluates Bit Error Rate and plots it versus SNR(signal to Noise Ratio). )

這是一個可以自動尋找图像中的長方形, 正方形, 圓形, 菱形的程式(1- Read the RGB (colored) image in from user. 2- Convert image from (RGB) colored to gray image. 3- Threshold the image (convert gray image to binary image). 4- Invert the binary image (in order to speed up the time of processing). 5- Find the boundaries concentrate. 6- Determine shapes properties (ratio of dimensions, roundness). 7- Classify shapes according to its properties. )

数字无线通信系统之有码间干扰的BPSK调制与解调MATLAB仿真(digital wireless communication systems are inter-symbol interference BPSK modulation and demodulation MATLAB)