-------- Original message --------
From: Matt E.
Date:2014/10/16 22:42 (GMT+00:00)
To: John M.
Cc: David Halls ,GNURadio
Subject: Re: [Discuss-gnuradio] Source Block - Flow Control
On Thu, Oct 16, 2014 at 8:40 AM, John M.
<[email protected]mailto:[email protected]>
wrote:
I’m happy this is working for you, David. So do I understand correctly,
that the adding tx_time finally made the MIMO case work?
I’d never done burst transmission with multiple USRP outputs. I’m not
totally surprised but I wasn’t sure what would happen.
Maybe someone from Ettus can comment on this? Since UHD is trying to do
time alignment in the multi_usrp class, what happens to time alignemt in
the non-continuous-streaming case if you don’t include a tx_time tag?
Noncontinuous streaming means there is some amount of down time. If you
don’t include tx_time tags, the device doesn’t know when to start back
up again, so each antenna is going to start at a different time.
Matt
That seemed exactly the kind of behaviour I saw where sync between the
two streams was lost. Matt, can you comment on whether I need to put
dummy padding items before the first burst? to flush buffers and is
there a delicate way to do this?
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