Hi Activecat,
I still don't understand; do you really just want a offline data
periodogram?
In that case, have a look at the python matplotlib library examples.
Also, Martin's and Lou's statements still stand: just by labeling an
axis dBm doesn't make the data actually represent that physical
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
On 03/06/2015 10:12 AM, Marcus Müller wrote:
Hi Activecat,
I still don't understand; do you really just want a offline data
periodogram?
In that case, have a look at the python matplotlib library examples.
Also, Martin's and Lou's statements still stand: just by labeling an
axis dBm doesn't
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
The gr-specest toolbox has all sorts of spectrum estimation algorithms,
but they also don't calibrate your device. A periodogram would be in
there, called 'welch'.
M
On 06.03.2015 05:54, Activecat wrote:
Dear Sirs,
Thanks for the answers. Let me further elaborate.
I could get what I want
Activecat,
this is actually on our FAQ:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-do-I-know-the-exact-voltagepower-of-my-received-input-signal
This is a very difficult problem to solve and it requires expensive lab
equipment.
Regards,
Martin
On 04.03.2015 23:43, Activecat
Do you mean adding a text label on the vertical axis, or scaling the
spectrum? For the latter, you would have to feed the USRP a known
(calibrated) noise source that is well above the USRP noise floor such as an
HP 346 noise source. Then read the value from the spectrum and just
re-scale the
Dear Sir,
I am using USRP to receive signal, and then plot the signal using WX GUI
FFT Sink.
I hope to get the vertical axis as Power Spectral Density in dBm/Hz.
Is there any way to do that?
Regards.
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