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

2014-03-31 Thread Azza
Thank you. That helps. Azza -- View this message in context: http://gnuradio.4.n7.nabble.com/How-to-calculate-SNR-tp47193p47354.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.or

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

2014-03-31 Thread Tom Rondeau
On Mon, Mar 31, 2014 at 2:56 PM, Azza Ben Mosbah wrote: > Hi All, > > I checked this document, it gives an idea about SNR estimators in GNU Radio: > http://www.trondeau.com/blog/2011/12/30/snr-estimators.html > And I checked this Python file: > http://gnuradio.org/redmine/projects/gnuradio/reposit

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

2014-03-31 Thread Azza Ben Mosbah
Hi All, I checked this document, it gives an idea about SNR estimators in GNU Radio: http://www.trondeau.com/blog/2011/12/30/snr-estimators.html And I checked this Python file: http://gnuradio.org/redmine/projects/gnuradio/repository/revisions/ef4d48de26b64d89851a93fc5402b33fcc1a809f/entry/gr-digi

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

2014-03-26 Thread Azza Ben Mosbah
Ah, ok thank you. Azza -- View this message in context: http://gnuradio.4.n7.nabble.com/How-to-calculate-SNR-tp47193p47237.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org htt

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

2014-03-26 Thread Tom Rondeau
On Wed, Mar 26, 2014 at 8:46 AM, Azza Ben Mosbah wrote: > Ok. Thank you. I will see that. > A one more question please: the SNR, is it in dB? and why the output for the > SNR block is complex? > > Azza Azza, Please try to be more specific with your questions. Notice that there are two blocks tha

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

2014-03-26 Thread Marcus Müller
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Azza, On 26.03.2014 16:46, Azza Ben Mosbah wrote: > Ok. Thank you. I will see that. A one more question please: the > SNR, is it in dB? and why the output for the SNR block is complex? This is a pass-through block; it just forwards the complex sampl

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

2014-03-26 Thread Azza Ben Mosbah
Ok. Thank you. I will see that. A one more question please: the SNR, is it in dB? and why the output for the SNR block is complex? Azza -- View this message in context: http://gnuradio.4.n7.nabble.com/How-to-calculate-SNR-tp47193p47233.html Sent from the GnuRadio mailing list archive at Nabble

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

2014-03-26 Thread Marcus Müller
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Ah, the picture of your flowgraph took some time to load, so I thought it was broken. First of all: to get truly comparable numbers, you should set the IIR alpha to the same value for the probe and the RMS blocks. Then: What you're doing with the RMS

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

2014-03-26 Thread Azza Ben Mosbah
As you can see from the flowgraph, I add noise to the signal to simulate a channel. And I calculate the SNR at the receiver. Since the noise is known, I can calculate my SNR. But, comparing to the output of the "MPSK SNR Estimator Probe", it is not the same. Azza -- View this message in context

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

2014-03-26 Thread Marcus Müller
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Azza, how do you know RMS(noise)? Greetings, Marcus On 26.03.2014 16:14, Azza Ben Mosbah wrote: > I calculate the SNR using the formula > SNR=20*log10[RMS(signal)/RMS(noise)]. You find attached my flow > graph.

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

2014-03-26 Thread Azza Ben Mosbah
I calculate the SNR using the formula SNR=20*log10[RMS(signal)/RMS(noise)]. You find attached my flow graph. Azza -- View this message in context: http://gnuradio.4.n7.nabble.com/How-to-calculate-SNR-tp47193p47229.html Sent from the

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

2014-03-26 Thread Martin Braun
On 03/25/2014 11:04 PM, zielalaoui wrote: > Hi azza and Martin, > I have the same problem, that is my flowgraph. > > The SNR values have not sens. For example, with 0.065 transmitting power i > had values between 0.06 and -0.012. may be the

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

2014-03-25 Thread zielalaoui
Hi azza and Martin, I have the same problem, that is my flowgraph. The SNR values have not sens. For example, with 0.065 transmitting power i had values between 0.06 and -0.012. may be the problem is how to use the block in the flowgraph. I

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

2014-03-25 Thread 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 val

[Discuss-gnuradio] How to calculate SNR?

2014-03-25 Thread Azza Ben Mosbah
Hi All, 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 "MP