You can definitely do that! In fact, it's pretty easy. Really, read the
tutorials I've linked to, and you'll quickly get an idea what to do
when you want a moving average of the power of a signal (namely,
convert it to it's magnitude┬▓, then apply a moving average), and once
you have that, it's really only building basic math to calculate the
variance :)

GNU Radio comes both with the possibility to interface with SDR
hardware, so that you can assess real-world signals and propagations,
as well as with several channel models that you can use to simulate.

Best regards,
Marcus

On Tue, 2018-03-06 at 16:50 +0300, Roman wrote:
> Marcus, 
> 
> Sorry for confusion, language problem.
> I would like to calculate first and second statistical moments (mean and 
> variance) for received signal level. 
> 
> Regards,
> Roman
> 
> On Tuesday, March 6, 2018, M├╝ller, Marcus (CEL) <muel...@kit.edu> wrote:
> > Hi Roman,
> > 
> > probably, it's possible, but I have no idea what you mean with "signal
> > deviation". Maybe you could elaborate?
> > 
> > To give you a quick look into what GNU Radio can do for you: see https:
> > //tutorials.gnuradio.org
> > 
> > Happy signal processing,
> > Marcus
> > On Tue, 2018-03-06 at 08:50 +0300, Roman wrote:
> > > Hi group,
> > >
> > > I would like to evaluate the signal deviation in different propagation 
> > > conditions. Is there a way to calculate this in gnuradio or should I 
> > > export data for further external processing?
> > > Thanks for replying!
> > > Roman
> > > _______________________________________________
> > > Discuss-gnuradio mailing list
> > > Discuss-gnuradio@gnu.org
> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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