[USRP-users] Direction finding using the B210

Martin Braun martin.braun at ettus.com
Wed Oct 29 04:26:03 EDT 2014


On 10/29/2014 07:03 AM, Soumen Banerjee wrote:
> Hi Martin,
> 
> I completely understand what you are saying. Also, thanks a lot for the
> links. Any specific one among them that you would recommend for a simple
> explanation of complex baseband?
> 
> In fact, I just captured 1024 samples using the rx_samples_to_file
> example and got a file that is 4096 bytes long. Since the type defaults
> to short, Im guessing each sample is a complex number. A cursory look at
> the code seems to confirm this. Is this like A+jB where the magnitude of
> the complex number is the amplitude of the received signal and the phase
> is given by arctan(B/A) ?

That's correct. rx_samples_to_file --type will allow you to select other
data types (all complex).

M

> 
> Thanks,
> Soumen
> 
> On Tue, Oct 28, 2014 at 5:21 PM, Martin Braun via USRP-users
> <usrp-users at lists.ettus.com <mailto:usrp-users at lists.ettus.com>> wrote:
> 
>     On 10/28/2014 12:13 PM, Soumen Banerjee wrote:
>     > Hi,
>     > I do have gnuradio installed. I have been working with the uhd examples
>     > in C++ though. I guess Ill follow through with the rx_multi_samples
>     > example you suggested.
>     >
>     > Im afraid I dont completely understand your comments on baseband. If I
>     > understand correctly, what you are saying is that when we set the
>     > receiving center frequency on the B210, it automatically downconverts to
>     > baseband (removing the 5GHz carrier). Is this correct?
> 
>     'Removing the 5 GHz carrier' is a bit ambiguous, but yes.
> 
>     Not to sound patronizing here, but it's absolutely essential that you
>     understand what you're dealing with here before you start coding. The
>     concept of complex baseband is well explained in many textbooks and
>     websites, a list of them can be found here:
>     http://gnuradio.org/redmine/projects/gnuradio/wiki/SuggestedReading
> 
>     From your comments, it seems like you're probably on the right track
>     anyway, but I seriously recommend you have a look at some of those
>     ressources to make sure you're speaking the same language as the rest of
>     the SDR community.
> 
>     Have fun,
>     Martin
> 
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> 
> 





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