SNR or Other Metrics

GNU Radio
#1

I’d like to report some signal metrics for satellite downlinks. SNR
would
seem to be one example, but most algorithms I see for SNR assume that
you
are generating a signal from a separate clean signal and noise source,
each
with known power. What I have are recordings of real, narrow-band,
digital
FM signals. I don’t have a very strong DSP background.

Can anyone point me to a good textbook that covers such practical
applications?

Thanks for your help!

#2

On Mon, Dec 16, 2013 at 11:22 PM, Dan CaJacob [email protected]
wrote:

I’d like to report some signal metrics for satellite downlinks. SNR would
seem to be one example, but most algorithms I see for SNR assume that you
are generating a signal from a separate clean signal and noise source, each
with known power. What I have are recordings of real, narrow-band, digital
FM signals. I don’t have a very strong DSP background.

Can anyone point me to a good textbook that covers such practical
applications?

Thanks for your help!

Hi Dan,

SNR estimations are quite tricky in real life. If you look at the
digital::mpsk_snr_est blocks, there are multiple implementation inside
that do SNR estimations for M-ary PSK constellations. The different
algorithms have varying accuracy and (mostly) proportional complexity.
But as the name implies, this won’t work for FM.

Looking at Google, I found a short paper from Virginia Tech,
co-authored by Steve Ellingson. I know Steve a bit, though he came
just as I was finishing up my work there, and he tends to be pretty
good with these things. So it’s likely a good start mathematically for
what you need.

http://www.ece.vt.edu/swe/asmr/docs/ASMR_R16_Kumar2.pdf

Tom

#3

Thanks, Tom! Yeah, I have avoided the MPSK SNR blocks because I figured
they were specific to PSK.

Very Respectfully,

Dan CaJacob