On Wed, Sep 1, 2010 at 8:52 PM, Sam Keene <[email protected]> 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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