On 11/20/2020 11:49 AM, Rob Kossler wrote:
Hi Cameron,
Yes, this is possible. I'm not too familiar with gnuradio but in the
end you need to use a "timed start" to the receive streams.
Rob
On Fri, Nov 20, 2020 at 7:34 AM Cameron Matson via USRP-users
<usrp-us...@lists.ettus.com <mailto:usrp-us...@lists.ettus.com>> wrote:
Hello all,
I'm trying to implement a MIMO receiver using the 4 RF chains of
the N310. To test the timing of the system, at the transmitter
I'm simply sending a short pulse from one transmit antenna of one
USRP. At the receiver it looks like there is up to a ~20 ms
delay/offset between the pairs of antennas 0/1 and 2/3 and that
this delay changes each time I restart my GNURadio flowgraph. I
can see the delay both in GNURadio GUI Time Sink and in actual
samples that I write to file. I've tried various pulse widths and
sampling rates at both the tx and rx, and it seems invariant to these.
I'd really like to be able to synchronize the 4 RF chains in time
simultaneously. Is that possible?
Thanks
Cameron Matson
_______________________________________________
Cameron:
Can you share a simple Gnu Radio flow-graph that displays this
behavior? A 20ms offset is *HUGE*. Are all 4 streams being streamed out
of the same uhd_source object?
