Re: [Discuss-gnuradio] IEEE802.11a/g/p OFDM Encoder for USRP2 released on CGRAN

[Paul Fuxjäger]

Am 25.01.10 04:20 schrieb "Yanjun Wu" unter <address@hidden>:

> Do you use any daughterboard sold by Ettus?
> I'm also interested in 802.11p, but I'm not sure whether USRP2 plug XCVR2450
> are appropriate for 802.11p 5.9GHz test.  
> 

Yes, we are using the XCVR2450 in the 5.9GHz band, so far without any big
problems. We do seem to have a little issue, that was discovered just
yesterday:

Using a second USRP2 to record the received baseband signal we see that each
sent frame is directly followed by a delayed and attenuated (around 25dB)
copy of it. This "artifact" is definitely not contained in the digital
baseband data that we generate on the transmitter-side, so it must be
introduced by the USRP2/Daughterboard system. Also these copies are not seen
when looking at the signals from another source - so they are not
measurement artifacts either. I currently busy trying to find out more...

Cheers
paul