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Re: [Discuss-gnuradio] Synchronizing N210 TX and RX channels

From: Stefan Wunsch
Subject: Re: [Discuss-gnuradio] Synchronizing N210 TX and RX channels
Date: Tue, 22 Jul 2014 19:14:05 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Hey Daniele,

I have done the radar toolbox and implemented a synced USRP interface
(USRP Echotimer).

You are right, the USRP Echotimer does align the timestamps of the TX/RX
commands on both USRPs. But if you connect them by MIMO, the time and
clock are pretty good in sync. Therefore I think the Echotimer can
provide a sync with an accuracy of at least +- 1 sample. Check out [0]
for a video of the sync. There is also a sync setup for testing
(gr-radar/examples/usrp). Unfortunately the documentation is not
finished yet.

But care: The Echotimer bursts only a packet in sync, it does not stream
the whole time! The packet is defined by a tagged stream.



Am 22.07.2014 18:40, schrieb Daniele Nicolodi:
> On 22/07/2014 18:18, Martin Braun wrote:
>> On top of what Marcus' has said,
>> the gr-radar toolbox might be helpful. It has a block that takes a
>> tagged stream, and outputs a signal it acquired synchronously to the
>> transmitted one.
> Thanks Martin.  This seems to imply that there is no way to actually
> synchronize the hardware, and that the synchronization can only be done
> in software aligning the timestamps of the two streams. Is that the case?
> Thanks. Cheers,
> Daniele
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