Re: [Discuss-gnuradio] How to calculate SNR?

[Martin Braun]

On 03/25/2014 05:00 PM, Azza Ben Mosbah wrote:
> In order to calculate the SNR at the receiver, I have generated a QPSK
> signal, sent it with an USRP through a canal and then received it with
> another USRP. 
> So, I have used The "MPSK SNR Estimator" block at the receiver to
> monitor the SNR values. But values are not correct, I have tried "MPSK
> SNR Estimator Probe" block, but values still not correct.
> 
> I am wondering what is the proper way to use "MPSK SNR Estimator" block?
> or if there is another block or method to retrieve SNR values correctly?
> So that I can find correct results.
> Any help is appreciated. Thank you.

Estimating SNR is a bit of a science. How do you know your SNR values
are incorrect?
In general, our SNR estimators have been tested a lot and should work.
Post your rx flow graph and your results, that way we can tell what
you've been doing.

M