Re: [Discuss-gnuradio] PSD in dBm/Hz

[madengr]

Equivalent function here, which could be encapsulated into a GR block if you
don't need speed:

http://docs.scipy.org/doc/scipy-dev/reference/generated/scipy.signal.periodogram.html

I suppose it boils down to the difference between an FFT just normalized to
bandwidth, and the FFT of the autocorrelation; the latter is the true
definition of PSD.  I learned this once 20 years ago (power signals vs.
energy signals) but I don't remember anymore.  Maybe someone can chime in.

Lou
  


activecat wrote
> Dear Sirs,
> 
> Thanks for the answers. Let me further elaborate.
> 
> I could get what I want using Matlab, via below steps:
> 1).  Using GRC flowgraph, connect the USRP Source to a File Sink.
> 2).  Copy the file (says, test02.dat) to a PC running Matlab.
> 3).  Using Matlab, run these commands:
>        a).  c = read_complex_binary('test02.dat')
>        b).  figure; periodogram( c(1:100000), [], [], 10e6 )          #
> samp_rate is 10e6
> 
> In this case I am able to get a PSD plot.
> The question is, how to produce the PSD plot using only gnuradio (without
> Matlab) ?
> 
> Thank you very much.





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