[Discuss-gnuradio] semi OT - data-aided SNR estimate of a complex signal
From:
William Cox
Subject:
[Discuss-gnuradio] semi OT - data-aided SNR estimate of a complex signal in MATLAB/Octave
Date:
Mon, 23 Aug 2010 13:04:07 -0400
I'm working on processing, in MATLAB/Octave, some data that I've taken with a communication device we've built. We're planning on moving to USRP/GNURadio, but before that happens, I've got to get this data processed.
Previously we've done communication with an on-off-keying signal (OOK with a laser). We wanted to estimate the SNR of the signal, so we use a data-aided approach. Now I'm changing the system to use complex signaling and I'm struggling with how to do the SNR estimation with complex signals. Previously, we did this:
Now I need to modify this for complex signals. Should I: a) compute the SNR for the real and imaginary components separately and then somehow combine them? b) compute the SNR on the complex signals directly.
If a), then how should I combine them? It's AWGN noise, btw. If b), then I need to take the covariance of Y, but I don't know how to take the two variances and use them.
I've never been all that good at this stuff and I'm learning slowly.
Thanks for your help.
-William
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