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1、白噪声的测试MATLAB程序学术篇2009-11-1322:18:03阅读232评论0 字号：大中小 订阅clear;clc;%生成各种分布的随机数x1=unifrnd(-1,1,1,1024);%生成长度为1024的均匀分布x2=normrnd(0,1,1,1024);%生成长度为1024的正态分布x3=exprnd(1,1,1024);%生成长度为1024的指数分布均值为零x4=raylrnd(1,1,1024);%生成长度为1024的瑞利分布x5=chi2rnd(1,1,1024);%生成长度为1024的k
2、aifang分布%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%求各种分布的均值m1=mean(x1),m2=mean(x2),m3=mean(x3),m4=mean(x4),m5=mean(x5)%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%求各种分布的方差v1=var(x1),v2=var(x2),v3=var(x3),v4=var(x4),v5=var(x5)%%%%%
3、%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%求各种分布的自相关函数figure(1);title('自相关函数图');cor1=xcorr(x1);cor2=xcorr(x2);cor3=xcorr(x3);cor4=xcorr(x4);cor5=xcorr(x5);subplot(3,2,1),plot(1:2047,cor1);title('均匀分布自相关函数图');subplot(3,2,2),plot(1:2047,cor2);title('
4、正态分布');subplot(3,2,3),plot(1:2047,cor3);title('指数分布');subplot(3,2,4),plot(1:2047,cor4);title('瑞利分布');subplot(3,2,5),plot(1:2047,cor5);title('K方分布');%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%求各种分布的概率密度函数y1=unifpdf(x1,-1,1);y2=no
5、rmpdf(x2,0,1);y3=exppdf(x3,1);y4=raylpdf(x4,1);y5=chi2pdf(x5,1);%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%各种分布的频数直方图figure(2);subplot(3,2,1),hist(x1);title('均匀分布频数直方图');subplot(3,2,2),hist(x2,[-4:0.1:4]);title('正态分布');subplot(3,
6、2,3),hist(x3,[0:.1:20]);title('指数分布');subplot(3,2,4),hist(x4,[0:0.1:4]);title('瑞利分布');subplot(3,2,5),hist(x5,[0:0.1:10]);title('K方分布');%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%各种分布的概率密度估计figure(3);[k1,n1]=ksdensity(x1);[k2,n2]=ksdensity(
7、x2);[k3,n3]=ksdensity(x3);[k4,n4]=ksdensity(x4);[k5,n5]=ksdensity(x5);subplot(3,2,1),plot(n1,k1);title('均匀分布概率密度');subplot(3,2,2),plot(n2,k2);title('正态分布');subplot(3,2,3),plot(n3,k3);title('指数分布');subplot(3,2,4),plot(n4,k4);title('瑞利分布');subplot(3,2,5),plot(n5
8、,k5);title('K方分布');%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%功率谱密度%plot(abs(fft(cor2,2^18)));plot(fft(cor2,2^18));plot(fft(cor3,2^18));plot(fft(cor4,2^18));plot
