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Re: [Discuss-gnuradio] atsc speed boost

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] atsc speed boost
Date: Thu, 18 May 2006 17:56:09 -0700
User-agent: Mutt/1.5.9i

On Wed, May 17, 2006 at 04:22:09PM -0400, Chuck Swiger wrote:
> On Wed, 2006-05-17 at 15:52 -0400, Charles Swiger wrote:
> > just collect data with decim = 10, then interp by 3 (6.4Msps to
> > 19.2Msps), then upshift.   The 0.9 code need two changes, one to
> Some more fat can be squeezed out of the pipeline if the 'upshift
> to 5.75MHz' and FPLL could be combined. Both are in the gr2 realm,
> but as it is, the FPLL is just a 2.0 wrapper on the old code, which
> takes float in/out so the spectrum has to be all real positive
> frequencies. A complex version that can take a pilot freq of -2.69Mhz
> I think would help. It would also eliminate the need for a mixer image
> lp filter.
> --Chuck

Now you're getting closer.  If you start with the complex baseband
from the USRP, and rework the FPLL so that it works with complex
input, you can get rid of a bunch more ;)


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