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Homework Help: Plotting Power Spectrum Density in Matlab

  1. Sep 3, 2011 #1
    1. The problem statement, all variables and given/known data
    I have an autocorrelation function given by
    R([itex]\tau[/itex]) = [itex]J_0[/itex](2[itex]\pi[/itex][itex]f_d[/itex][itex]\tau[/itex])

    I have already plotted it in Matlab using the following commands
    ts=0.0000001;
    fs=1/ts;
    fd=100;

    tau=0:0.0000001:0.05;
    R=besselj(0,2*pi*fd.*tau);

    How do I plot its PSD in Matlab and the plotted picture looks like this:
    http://www.mypicx.com/09032011/Temp/

    2. Relevant equations



    3. The attempt at a solution
    When I use the command pwelch(R), it just won't yield the picture.
    http://www.mypicx.com/09032011/blabla/

    I will obtain something different. How do I scale it so that I will resemble the picture given. thanks
     
    Last edited: Sep 3, 2011
  2. jcsd
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