fftfiltler

some matlab codes to practice matlab in the field of signal processing

DFT进行频谱分析时的三种现象 1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。 采样前加低通滤波器防混叠 2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。 改用其他窗函数（非矩形）改善泄漏。 3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。(DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.)

基于matlab的微波工程实验仿真：matlab波导中横截面电磁场的矢量力线图表示包括主要的矩形波导TE与TM模，与圆柱波导的TE与TM模(Based on the experimental simulation matlab Microwave Engineering: Vector power line graph matlab waveguide cross-sectional representation of the electromagnetic field, including the main rectangular waveguide TE and TM modes, and a cylindrical waveguide TE and TM modes)

本算例用正交多项式，采用最小二乘法拟合散点函数曲线，程序为MATLAB编写！(zuixiao ercheng duoxiangshi)

距离保护simulink程序，可实现相间短路和接地短路。(Distance protection simulink program.the distance protection of phase faults and earth faults can be realized.)

this code about mashin learning

提出了结构半随机LDPC码的编码协同方案，并对该方案在不同的源到中继信道特性下 的误比特性能进行了仿真评价，结果显示该协同方案在不增加传送和接收功率的情况下，能够提供 更好的性能。(Structure of semi-random LDPC codes coded cooperative programs, and of the program in different source to relay channel characteristics, bit error performance simulation evaluation results show that the synergistic programs without increasing the transmit and receive power able to provide better performance.)

matlab实现的RSA加密算法,非常易于使用(matlab implementation of the RSA encryption algorithm, very easy to use)

ADMM 交替方向乘子法Alternating Direction Method of Multipliers(Alternating Direction Method of Multipliers)

Image Super-Resolution via Sparse Representation