marshi

说明：  通带截止频率 =1000Hz，阻带截止频率 =1200Hz，采样频率fs=5000Hz，通带衰减系数 =0.3dB，阻带衰减系数 =40dB。(The digital filter are the digital signal processing important content, the digital filter may divide into IIR and the FIR two main kinds. As for the IIR digital filter design, we need the help of analog prototype filter, and then transform analog filter into digital filter. )

模式识别MATLAB代码模式识别M模式识别MATLAB代码ATLAB代码(Pattern of all kinds of matlab algorithm )

this code is for simulation solution

简单的sparse coding的小程序，基本可以了解sparse coding的工作过程。(Simple sparse coding small procedures, the basic can understand the working process of sparse coding.)

接收端采用的算法和程序流程与发送端发送的OFDM符号的帧结构有关系。具体的帧结构，以及定时估计，频偏估计，剩余误差跟踪的算法可参考算法说明文档。这里对程序的流程进行说明。 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。 (The receiving end uses the algorithm and the program flow and the frame structure of the OFDM symbol transmitted by the sending end. Specific frame structure, and timing estimation, frequency offset estimation, residual error tracking algorithm can refer to the documentation. Here to illustrate the process of the program. First, according to the characteristics of the short training word correlation operation, the signal reaches the detection, when the correlation value is greater than the threshold of a certain number of times, that there is a signal to reach. Then, according to the characteristics of the long training word, the correlation operation is carried out, and the initial position of the OFDM symbol FFT is estimated. The estimated position of the FFT window, first in the time domain for small frequency offset estimation, two long training word for small frequency offset compensation, the FFT operation. According to the result of FFT for integer frequency bias estimation. Af)

Akaike阶次辨识在白噪声的情况下通过计算AIC的值得到最终的结果。(Akaike order identification in the case of white noise by calculating the AIC' s worth to the final result.)

MATLAB在通信系统仿真 第二版书中例题代码(MATLAB simulation of communication systems in the second edition of the book example code)

光纤光栅传输函数仿真，可以根据现实需要，更改各种参数(Optical fiber grating transmission function simulation and may, according to the need of reality, change all kinds of parameters )

sinc插值函数，在SAR、ISAR，通信等信号处理中有广泛的应用，是非常好的学习代码。(sinc interpolation function, there is a wide range of applications in the SAR, ISAR, communications and other signal processing, is a very good learning code.)

基于DV-Hop的定位算法，利用三边测量以及极大似然估计法实现定位，误差较低，有误差分析图。(Based on DV-Hop localization algorithm, using trilateration and maximum likelihood estimation method to achieve localization, lower error margin of error analysis chart.)