Matlab-mathematical-modeling

Iterative Solutions is committed to the mission of developing accurate and efficient software for the simulation of modern communication systems. All software is licensed as open source software under the Lesser GPL. The code is designed to run in matlab, though the compute-intensive portions are written in C and Java. A wide variety of error control codes are supported, including turbo and LDPC codes, and an emphasis is placed on nonbinary modulation formats such as QAM and nonbinary continuous-phase FSK. The software goes beyond the usual error rate analysis by including tools for determining the Shannon capacity of arbitrary modulation formats.

在加入高斯白噪声的情况下,假设信噪比为10dB，形成传统波束形成法、Bartlett波束形成法、Capon波束形成法的空间谱图(Prior to joining the case of white Gaussian noise, assuming the SNR is 10dB, the formation of conventional beamforming method, Bartlett beamforming method, Capon Beamforming spectrum of space law)

一维光子晶体透射率与折射率差值的关系示意图，总体上来说，不同介质的介电常数差别越大，带隙的宽度也越宽。(The diagram of photonic crystal transmittance of one-dimensional and refractive index difference)

M=63 J=(M-1)/2 Wp=0.5*pi Ws=0.6*pi Np=100 Ns=100 weightp=1 weights=100 通带和阻带的加权系数 WpN=linspace(0,Wp,Np) WsN=linspace(Ws,pi-0.05,Ns) Wm=[WpN WsN] p=[ones(1,50),ones(1,50)/2] d=[p,zeros(1,Ns)] W=diag([weightp*ones(1,Np),weights*ones(1,Ns)]) C=cos(Wm*[0:J]) Q=diag(cos(Wm*0.5)) g=(W*Q*C)(W*d) g=g h=(g(J:-1:2)+g(J+1:-1:3))/4 h=[g(J+1)/4 h g(1)*0.5+g(2)/4] h=[h fliplr(h)] W=linspace(0,pi-0.1,512) H=freqz(h,1,W) plot(W/pi,20*log10(abs(H))) (filter design)

在无线通信体系中,由于开放的通信信道条件,卫星通信系统中通信链路容易受到平均大气条件的影响,尤其是采用Ka波段的高频信号的系统,容易受到降雨造成的雨衰影响,严重影响了系统的有效性和可靠性。(In a wireless communication system, the communication channel open, average atmospheric conditions vulnerable to the communication link in satellite communication system, especially the system of high frequency signal using Ka band, vulnerable to the influence of rain attenuation caused by rainfall, seriously affect the validity and reliability of the system. In digital systems, channel coding is often used to improve reliability, while modulation is used to ensure effectiveness. Low order modulation and large redundancy coding are adopted to improve the reliability.)

GM(1,1) Predictor (Grey Model)

The most possible scenarios of system voltage collapse are investigated at different times of the study perio

最优分类法，用于找出数据的变差举证，并确定分类数(Optimal classification of evidence used to identify the data variation and to determine the number of classification)

这两个小程序是matlab的.m文件，06为采用二维中值滤波函数medfilt2对受椒盐噪声干扰的图像滤波，07采用matlab中的函数filter2对受噪声干扰的图像进行均值滤波。(these two small procedure is Matlab. M documents, 06 for 2D median filtering function medfilt2 right by the Salt and Pepper image noise filtering, 07 using Matlab filter2 the function of noise interference by the image filtering.)

离散的kalman滤波，计算信号的滤波值、预测值，估计误差及预测误差(kalman filter)