Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup

[CEL]

Hey Marcus,

yep, good catch: 64 kHz is far too low a sampling rate; Ayaz, start
with something like 1 MS/s. (also, what kind of CSI will you be getting
when observing a 64 kHz wide channel?
Are you looking for reflections that have a path length difference
larger than (sandy gears turning in my head… ) more than 4.6 km?

(by the way, your 1 kHz OFDM subcarrier spacing is something that you'd
actually encounter in digital broadcast standards – DAB/DAB+ does
exactly that, and that 1 kHz essentially allows for delay spread of up
to 300 km)

I'd agree, the easiest solution here would be just splitting your
output sample stream in two, and multiplying one with 0 while the other
is 1, and vice versa.


Best regards,
Marcus (the other one)

On Fri, 2018-07-13 at 15:20 -0400, Marcus D. Leech wrote:
> On 07/13/2018 01:08 PM, Ayaz Mahmud wrote:
> > Hi Marcus,
> >  
> > Here the .grc file. You might have to change the File Source (tx) &
> > destination folder(rx)
> >  
> > Ayaz
> >  
> > 
>  I get that you want to alternate "active" antennae, and there are
> probably burst-tagging schemes that will do this, but I'm not an
> expert on those.
> 
> I'll also observe that you're asking for a 64K sample-rate.  I'm not
> sure that the B210 will go down that low in sample rate, so you may
> have to
>   interpolate up to the minimum sample rate.
> 
> If it were *my* problem, I'd probably have a couple of vector sources
> of alternating 1s and 0s, interpolate them up to the desired sample
> rate
>    X the switching interval, and multiply the stream going into the
> USRP by that stream of 1s and 0s.
> 
> 
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