pid_prog

here are the codes in matlab for effects of temperature ,refractive index and length of the grating in FBG spectra,and reflection spectrum of TE and TM modes of 1D photonic crystals

清华大学张旭东老师现代信号处理第二次matlab习题(The second matlab exercise in modern signal processing by Xudong Zhang, Tsinghua univ.)

运用此程序来去除光谱中的宇宙射线。。。。。。。。。。。。。。(use this promgram to denoise ray from unniversal.)

通过Gallager和边增长算法生成LDPC码校验矩阵(generate the check matrix of LDPC code by using the Gallager method and progressive-edge-growth algorithm)

说明：  这个仿真程序用于实现DS-CDMA通信系统仿真 (The simulation program used to implement DS-CDMA Communication System Simulation)

otsu thresholding method

能量谱分析计算,Gabor小波变换与PCA的人脸识别代码，主同步信号PSS在时域上的相关仿真。( Energy spectrum analysis and calculation, Gabor wavelet transform and PCA face recognition code, PSS primary synchronization signal in the time domain simulation related.)

matlab下实现降噪，功率谱计算。％程序中设定采样点数为256个，采样频率为10000hz， ％输入信号为随机噪声和两个正弦的合成信号 ％设定的滤波器的截止频率为3500hz ％通过挈比雪肤滤波器，运行程序，比较滤波前后的频域波形 ％滤波去除了高频信号(matlab achieve noise reduction, power spectrum calculation. Sampling procedure set for 256 points, the sampling frequency of 10000hz, input signal for the random noise and the two sinusoidal signals synthetic filter set a cut-off frequency 3500hz manner than through the filter雪肤, run procedures, compared before and after filtering in frequency domain waveforms filtering in addition to high-frequency signals)

利用幂法和反幂法求解按模最小特征值，按模最大特征值。与MATLAB中eig功能相似 (get the character value of a matrix, similiar with the function eig in matlab)

This is a file two compute the angle between two target