Question regarding compute and plot DC-centered Power Spectral Density for Time Autocoorelation function , Rx(tau)=exp(-tau/T) , I have 3 different T values ( 1 , 5 , 10 ) , code below but it is not showing PSD as expected

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Mohamad 2019-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/441438-question-regarding-compute-and-plot-dc-centered-power-spectral-density-for-time-autocoorelation-func

编辑： madhan ravi 2019-1-25

% script plotting Autocorrelation function for different T values
% Plotting Power Spectral Density 
% Rx(tau)=exp(-tau/T)Rx(tau)=exp(-tau/T)
clc
clear
m=5;
tau=-10:0.01:10;
L=length(tau);
T=[1 5 10];
for j=1:3
xt(:,j)=exp(-abs(tau)/T(j));
[Pxx(:,j),f(:,j)] = periodogram(xt(:,j));
figure(1)
subplot(3,1,j)
plot(tau,xt(:,j))
grid on
grid minor
xlabel('Tau in Seconds')
ylabel('R_x(Tau)')
figure(2)
subplot(3,1,j)
plot(f,10*log10(Pxx(:,j)))
grid on
grid minor
xlabel('Hz')
ylabel('dB')
end

How to compute and plot DC-centered Power Spectral DensityDC-centered Power Spectral Density for Time Autocoorelation function , Rx(tau)=exp(-tau/T) Time Autocoorelation function , Rx(tau)=exp(-tau/T) , I have 3 different T values ( 1 , 5 , 10 ) , code below but it is not showing PSD as expected