[USRP-users] USRP noise

Josh Blum josh at ettus.com
Wed Sep 19 05:19:17 EDT 2012



On 09/19/2012 04:01 AM, Farrukh Aziz wrote:
> Hi, I am using USRP N210. I have recorded the USRP noise on the PC
> and it looks bizarrehttp://tinypic.com/view.php?pic=21acyl2&s=6 I
> have examined several noise measurements and they are similar to this
> shown in link. During the measurements I ensured that there were no
> impulses arising on the Fourier plot and the spectrum was pretty
> flat. I record the complex samples as two floating points to have
> good resolution. I understand that due to filtering USRP noise may
> not be pure AWGN, but what I see here is unacceptable. Is it due to
> the low resolution that cannot distinguish samples at such low
> values? I would be extremely grateful for any clarifications. Farrukh
> Aziz Bhatti
> 

Can you share the data type of the samples and what the plot scaling
means? The plots are showing 1.0*10^-21, but the smallest sample value
possible is 1.0/32767 when using complex floats.

-josh

> Department of Electrical & Computer Engineering University of
> Auckland
> 
> 
> 
> 
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