Looks like there is a random phase. Every time you start, the phase of the clock maybe different. Hence when you plot the signal, it's going to be different. I can observe the same random phase in my BPSK program.
Bakshi, Arjun via USRP-users <[email protected]>于2017年9月1日周五 下午2:48写道： > Hi all, > > > Had posted about this before, but focusing on 1 simple case here. > > > I'm observing a change in a wired channel every time I restart my flow > graph. I'm using 1 USRP + WBX board, i.e. tx and rx on the same USRP. So > time/frequency sync should not be a factor, I believe. > > > I simply do: start-> sleep(2)-> stop->wait->start->sleep(2).... looped 10 > times, and record the rxed signal. I see that during the 2 seconds the > channel remains constant, however after the restart the channel changes. > > > Any ideas on why this is happening? I was expecting to see the same > channel no matter how many times I restart the flow or even power cycle the > USRP. > > > Figures attached: Real and imaginary part of rxed signal, subsampled ~110 > to fit it all in. > > > Thank you, > > > Arjun > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
_______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
