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From: | Tom Rondeau |
Subject: | Re: [Discuss-gnuradio] Newbie question on USRP2, synchronization done by the FPGA?, |
Date: | Wed, 1 Sep 2010 21:19:22 -0400 |
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
--- On Wed, 9/1/10, Tom Rondeau <address@hidden> wrote:
From: Tom Rondeau <address@hidden>
Subject: Re: [Discuss-gnuradio] Newbie question on USRP2, synchronization done by the FPGA?,
To: "Sam Keene" <address@hidden>
Cc: address@hidden
Date: Wednesday, September 1, 2010, 9:03 PMOn Wed, Sep 1, 2010 at 8:52 PM, Sam Keene <address@hidden> 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,
-SamNo, 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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