[USRP-users] Direction finding using the B210

Soumen Banerjee soumen08 at gmail.com
Wed Oct 29 02:03:42 EDT 2014

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) ?


On Tue, Oct 28, 2014 at 5:21 PM, Martin Braun via USRP-users <
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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> USRP-users at lists.ettus.com
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