clearall;
closeall;
warningoffall;
Fs=1000;
nfft=1024;
idx=0:round(nfft/2-1);
k=idx*Fs/nfft;
t=0:1/Fs:1;
x1=rand(1,1001);
[cor1lag1]=xcorr(x1,\'unbiased\');
figure(1);
subplot(211),plot(lag1/Fs,cor1),title(\'(0,1)均匀分布自相关函数\');
Xk1=fft(cor1,nfft);
Px1=abs(Xk1);
subplot(212),plot(k,10*log10(Px1(idx1))),title(\'(0,1)均匀分布功率谱密度\');
x2=normrnd(2,5,1,1001);
[cor2lag2]=xcorr(x2,\'unbiased\');
figure(2);
subplot(211),plot(lag2/Fs,cor2),title(\'(2,5)正态分布自相关函数\');
Xk2=fft(cor2,nfft);
Px2=abs(Xk2);
subplot(212),plot(k,10*log10(Px2(idx1))),title(\'(2,5)正态分布功率谱密度\');
x3=cos(600*pi*t)cos(640*pi*t)randn(1,1001);
[cor3lag3]=xcorr(x3,\'unbiased\');
figure(3);
subplot(211),plot(lag3/Fs,cor3),title(\'随机信号自相关函数\');
Xk3=fft(cor3,nfft);
Px3=abs(Xk3);
subplot(212),plot(k,10*log10(Px3(idx1))),title(\'随机信号功率谱密度\');
fai=2*pi*rand(1,1001);
x4=2*cos(1000*pi*tfai);
[cor4lag4]=xcorr(x4,\'unbiased\');
figure(4);
subplot(211),plot(lag4/Fs,cor4),title(\'随机相位信号自相关函数\');
Xk4=fft(cor4,nfft);
Px4=abs(Xk4);
subplot(212),plot(k,10*log10(Px4(idx1))),title(\'随机相位信号功率谱密度\');
<h4class=\"ask\">追问
非常感谢!感觉你很厉害。我这里还有几个题,如果有时间能不能也帮我解答下,追加分。谢谢!
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