How to measure the SNR?

[HustLiliAn]

Hi, everyone , I want to measure the noise power and signal noise ratio by usrp. How can I do this accurately ? for example, when this is no signal , I acquire the samples from usrp , and sum the  square of the sample then  average , whether is the way to get the noise power?  and  how can I measure the SNR? Is there any example about this ? thanks  

[Sarah_Y]

Hey HustLiliAn,

Here are 2 other forum posts that had good responses about SNR and VIs that can be used to take the measurement:

http://forums.ni.com/t5/LabVIEW/Signal-to-Noise-Ratio-SNR-measurement/td-p/99326

http://forums.ni.com/t5/LabVIEW/how-to-calculate-signal-to-noise-ratio-from-the-graph/td-p/813558

If you are looking at the average power, SNR is just Psignal/Pnoise.  If you are looking at the amplitude of your signal, then you need to look at the RMS amplitude.  In that case you would use the formula (Asignal/Anoise)^2.  

[rakesh_10]

Hi hustlin,

I am trying to know how to find SNR in realtime systems like USRP .If u are able to figure it out ,can u please tell me how to get started.