On Sun, Feb 26, 2006 at 11:23:08AM -0500, Clark Pope wrote: > I've been collecting snapshots through my DBS and USRP to do DBPSK and > DQPSK bit error rate testing. I'm not able to get the BER below about 1e-5. > It seems that slips are occuring spontaneously in the data even though no > over/underflow is reported during the collection.
What are you using as your input signal? How's the level/gain? What is the avg peak signal level you are seeing from the USRP? What decimation rate are you using? Are you running some kind of symbol tracking algorithm? > Questions: > 1. Has anyone successfully done long term collections without any slips? Yes. I've run the gsmk2 code at 500k bit/sec with no FEC and no errors for many (10's ?) seconds at a time. > 2. Are the O/U flags sticky?, i.e. if I don't see an under or overflow > reported then I can be sure the fifos were okay? You're building from CVS, right? There was a xrun reporting problem that was fixed a couple of months ago. Yes, they are sticky. They are checked and cleared at about 10 Hz. > I've done BERs from 1 Mbaud to 11 Mbaud all with the same frequency of > slips so it does not appear to be speed related. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
