nat

超宽带信号的生成，以及用UWB信号实现MUSIC算法，得到AOA(Ultra-wideband signal generation, as well as the realization of MUSIC algorithm for UWB signals, the AOA)

本代码是单相正弦电压锁相环程序，用于根据单相正弦电压生成其相位角度信息，包括：正交处理、坐标变换、PI运算、积分运算、取模运算等步骤。(This code is a single-phase sinusoidal voltages phase-locked loop program for generating the phase angle information based on single-phase sinusoidal voltage, comprising: an orthogonal processing, coordinate conversion, PI operation, integral operation, the modulo operation and other steps.)

KNN Classification Matlab

机器学习中关于朴素贝叶斯（NB）方法的Matlab源代码，附带四个数据集用于实验(Machine Learning on Bayesian (NB) method of Matlab source code, with four data sets for experiments)

样本熵是时间序列复杂度的一种度量, 在上个世纪末期由几位非线 性动力学研究者提出。样本熵比近似熵更具有相对一致性(Sample entropy is a measure of the complexity of the time series, at the end of the last century by several non-linear dynamics researchers. Sample entropy more than approximate entropy relative consistency)

This is a matlab code of LEACH protocol that simulates the life of the sensor network.

彩色多普勒成像分析，通过多普勒频谱进行彩色成像(Color Doppler)

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)

图像插值程序，可以实现对图像的任意缩放，即可以图像尺寸改变为任意大小。(Image Interpolation procedures can realize arbitrary scaling of images, namely image size can be changed to any size.)

Matlab/Simulink model of asynchronous machine