On 02/23/2016 11:22 PM, Justyn wrote:
Hello,
I'm experimenting with the MIMO capabilities of the N210s with WBX
daughter cards and seeing how far I can get before I need the MIMO
breakout cable or GPSDO.
One of the first things I'd like to see is if both receivers on the
WBX daughter card can run at the same time (TX/RX and RX2).
Unfortunately, if I add two USRP source blocks with the same IP to my
flow graph and try it out, I get D's on the output.
According to
http://files.ettus.com/manual/page_general.html#general_ounotes, it
seems that I'm getting "discontinuous packets" and are subsequently
dropping data (which I can confirm). I assume it's because I'm
receiving data packets with the same source address, and probably
duplicated sequence numbers which GNU Radio thinks are discontinuous.
Is there a way around this? Is this a bug? It seems if I have the
bandwidth and physical hardware, I should be able to leverage those
capabilities, no?
This USRP and my workstation are connected through a switch, but if I
add a separate identical N210 with WBX to the switch, I get both sets
of data, so it's not a bandwidth issue.
--
Justyn
There is only a single receive chain on a WBX card--there are, granted,
two ANTENNA PORTS that may be selected that the receive chain
attaches to, but there really is only one receive chain on a WBX card.
The fact that you have two distinct UHD/USRP objects trying to
communicate with the same physical USRP is going to create a fair amount
of confusion in the lower layers which will result in unpredictable
behaviour.
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