-------- Original message -------- From: Matt Ettus Date:2014/10/16 22:42 (GMT+00:00) To: John Malsbury Cc: David Halls ,GNURadio Subject: Re: [Discuss-gnuradio] Source Block - Flow Control
On Thu, Oct 16, 2014 at 8:40 AM, John Malsbury <jmalsbury.perso...@gmail.com<mailto:jmalsbury.perso...@gmail.com>> 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? ________________________________ NOTE: The information in this email and any attachments may be confidential and/or legally privileged. This message may be read, copied and used only by the intended recipient. If you are not the intended recipient, please destroy this message, delete any copies held on your system and notify the sender immediately. Toshiba Research Europe Limited, registered in England and Wales (2519556). Registered Office 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, England. Web: www.toshiba.eu/research/trl --------------------------------------------------------------------------------------- This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com ---------------------------------------------------------------------------------------
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