On Wed, Sep 1, 2010 at 9:15 PM, Sam Keene <samke...@yahoo.com> wrote:
> Ok, thanks, One more question... So does that mean we control the NCO from > the software? > > I will have a look at those blocks. > > thanks, > > -Sam No, the NCO is free running. We compensate for it in software. Tom > --- On *Wed, 9/1/10, Tom Rondeau <trondeau1...@gmail.com>* wrote: > > > From: Tom Rondeau <trondeau1...@gmail.com> > Subject: Re: [Discuss-gnuradio] Newbie question on USRP2, synchronization > done by the FPGA?, > To: "Sam Keene" <samke...@yahoo.com> > Cc: discuss-gnuradio@gnu.org > Date: Wednesday, September 1, 2010, 9:03 PM > > > On Wed, Sep 1, 2010 at 8:52 PM, Sam Keene > <samke...@yahoo.com<http://mc/compose?to=samke...@yahoo.com> > > wrote: > > Hi, > > Thanks for the reply. I guess I am just trying to better understand this > diagram: > > > http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/073/7319/7319f3.inline.jpg > > I understand what the decimating filters are doing, but I'm a little > unclear about the NCO. Does this component phase and frequency lock for me, > or will I have to code that myself? > > thanks, > > -Sam > > > No, there is no freq/phase lock in the USRP/USRP2. We have to do this in > software. > > You can reference the dbpsk and dqpsk blocks that we have already written > or the newer dbpsk2/dqpsk2 blocks that use newer techniques for the phase, > frequency, and timing locks. > > Tom > > >
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