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

From: Daniele Nicolodi
Subject: Re: [Discuss-gnuradio] Synchronizing N210 TX and RX channels
Date: Tue, 22 Jul 2014 19:25:48 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Hello Stephan,

thank for your reply.  What I would like to do is more simple than that:
I need to synchronize tx and rx of the same USRP, not of two different
devices.  But I need continuous streaming and not burst.

Any help in this direction is much appreciated.

Thanks. Best,

On 22/07/2014 19:14, Stefan Wunsch wrote:
> 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.
> Greetings,
> Stefan
> [0]
> https://grradar.wordpress.com/2014/06/17/synchronisation-echotimer-usrp-interface/
> 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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