smith_chart

code for contrast stretching

cs4vm算法，是实现半监督学习的较好的方法，能够对多种数据集进行测试，代码中包含例子，下载即可以使用(cs4vm algorithms, semi-supervised learning is to achieve a better way to test a variety of data sets, the code contains examples that can be used to download)

WiMAX Physical layer simulator in Matlab

去斜率（strech）参考信号与回波信号混频后得到中频输出信号S(t)=Aexp(j*2*pi*f0*t+phase) 其中f0与回波延时的关系为： f0=k*delay_t K为线性调频斜率，delay_t为回波延时 将s(t)采样，FFT变换即可得到目标距离与频谱的关系。 Strech 信号测距 输入混频后的中频信号（图一），经采样及FFT变换得到频谱（图二） 再根据频谱与距离的关系式R=Tcf/2B显示出距离(图三) (Go slope (strech) obtained after the reference signal and the echo signal mixer IF output signal S (t) = Aexp (j* 2* pi* f0* t+phase) f0 and echo delay relationship: f0 = k* delay_t K chirp slope, delay_t the echo delay sampling s (t), the FFT transform to the target distance spectrum of relations. Strech signal ranging input mixer IF signal (Figure 1), sampling and FFT transform spectrum (Figure 2) according the the spectrum distance relationship R = Tcf/2B shows the distance (Figure 3))

This is a two stage method in which at first image RGB compensated and then converted to YCbCr to normalise overall illumination of image.Its cascaded implementation of section 2.A of paper "A FAST SKIN REGION DETECTOR" by Phil Chen, Dr.Christos Greecos, ESC Division Research 2005,and section 2.1 of paper "Simple and Accurate Color Face Detection Algorithm in Complex Background" by YUI TING PAI et al. ICME 2006 . Please go through those papers for more details.

个给定一段信号，采用不同的方法实现QPSK和OQPSK调试信号仿真(A given period of the signal, using different methods to achieve QPSK and OQPSK signal simulation debugging)

二阶和三阶锁相环实现costas环，能够实现载波跟踪(Second and third order phase-locked loop to achieve costas, to achieve carrier tracking)

主要是基于mtlab的程序，DoIqpNo参数是机器学习的例程，预报误差法参数辨识-松弛的思想，具有丰富的参数选项,Uwcywde条件基于matlab GUI界面设计,采用了小波去噪的思想。( Mainly based on the mtlab procedures, DoIqpNo parameter Machine learning routines, Prediction Error Method for Parameter Identification- the idea of relaxation, It has a wealth of parameter options, Uwcywde condition Based on matlab GUI interface design, Using wavelet denoising thought.)

boost型平均电流APFC,输出波形完美，输入电流thd低于4%(boost type average current control APFC)

利用MATLAB语言编写的腐蚀模拟程序，可以用于MATLAB软件的腐蚀计算(The corrosion simulation program written by MATLAB language can be used to calculate the corrosion of MATLAB software.)