fdtd3D

the matlab code of fading channel

说明：  T型三相两电平DCAC仿真，中间利用PI调节PWM对逆变器进行控制(T-type three-phase two-level DCAC simulation)

2D FDTD Codes with: standar formulation, flux density formulation, Mur ABC 1st and 2nd order, for TM mode

首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。(First, according to the characteristics of the short training word correlation operation, the signal reaching the detector, when the detected correlation value is greater than the threshold after a certain number of times that a signal arrives. And then the characteristics of long training word, the correlation operation for the FFT window starting position of an OFDM symbol estimate. The estimated position of the FFT window, the first small frequency offset in the time domain estimation, the two long training word small frequency offset compensation, the FFT operation, the FFT result of the operation for integer frequency offset estimate. These parameter estimation is completed, the data can be demodulated on. The first portion of the data for a complete frequency offset compensation, and based on the estimated FFT window position of the FFT operation to obtain frequency domain data, demodulated. Then corresponding to the position of the pilot subcarriers are extracted on pilot inform)

canny边缘算法的实现，代码比较简单，能实现。(canny edge algorithm, the code is relatively simple to achieve.)

一维卡尔曼滤波在matlab下的仿真 结合阈值判断剔除杂波干扰(A Kalman filter in matlab simulation combined with the threshold value judgment removed the clutter)

说明：  很好的一个电磁波散射的有限时域差分法一维程序(a 1D code for computing eletrimagnetic waves with FDTD)

给出了通过MATLAB设计FIR滤波器的程序，只需要输入滤波器类型和参数就能设计出特定滤波器，并产生DSP需要的数据，很有意义。(MATLAB is given through the FIR filter design process, only the type and parameters of input filter will be able to design a specific filter, and DSP have the data needed and meaningful.)

Matlab灰色预测成语代码，方便大家实用(Matlab work huiseyuce)

七自由度动力学模型的加速度分析，加速度响应信号(Acceleration analysis of the dynamic model of the seven degrees of freedom, and acceleration response signal)