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Re: [Discuss-gnuradio] continuous data collection?

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] continuous data collection?
Date: Sun, 26 Feb 2006 18:31:49 -0800
User-agent: Thunderbird 1.5 (X11/20051201)

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.
> Questions:
> 1. Has anyone successfully done long term collections without any slips?
> 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?
> 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.

Do the errors occur at uniform intervals?

This may actually be internal to GNU Radio.  Can you try demodulating a
signal which is generated in GNU Radio?  You should have no hardware in
the chain at all.  This will help tell us where the problem is.


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