SNR question

Hi

I would want to know if there a way to calculate SNR for a qpsk, 16 QAM
and
64 QAM signals. I have been using the “divide” block, which has as
inputs,
the signal that entries to the channel and a noise source fixed with the
voltage of noise that is fixed in the “channel model” block. Then, the
“divide” block’s output goes to the “log10” block Would this be
correct?

I copied this idea from another discussion.

http://gnuradio.4.n7.nabble.com/file/n47229/flowgraph.png

Thank you


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