Re: [Discuss-gnuradio] FHSS

[Joshua Davis]

  I'm going to be frequency hopping on the IF, thus by controlling the
USRP.  Welp, I guess I'm the pioneer here.  Hopefully this works out
pretty good!  Thanks for the info!


   ----
   Joshua Davis
   Transient Infrastructure Security Solutions


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On Tue, 5 Jul 2005, Eric Blossom wrote:

> On Tue, Jul 05, 2005 at 04:45:06AM -0400, Joshua Davis wrote:
> >
> >   Hi.  First time caller.
>
> Welcome!
>
> > Are any FHSS (frequency hopping spread
> > spectrum) options avail in software for gnuradio/USRP?  Or do I need to
> > create one by hand?  If someone else has implemented this, can someone
> > provide a pointer to code, so that I can use their ideas?
>
> We haven't implemented anything at this point, but we've given it
> quite a bit of thought.  One of the questions that needs be answered
> depending on your application/hardware, is would you be hopping by
> controlling the RF front end, or are you hopping over a narrow enough
> range of frequencies that we could do it all in software/FPGA?
>
> There are of course the normal wide band / dynamic range issues if you
> try to do the hopping all in software/FPGA, but it would be pretty
> straight-forward.  You could also hop at a ridiculously high rate
> since you don't have to wait for an analog PLL to settle.
>
> It might we worth taking a look at the FM3TR spec for a starting
> point.
>
> http://mccoy.ucsf.edu/emondi/Public/FM3TR/FM3TR_Summary.html
> http://www.computing.surrey.ac.uk/personal/pg/E.Willink/wdl/Fm3tr.html
> http://www.sdrforum.org/MTGS/mtg_25_sep01/01_i_0056_v0_00_fm3tr_97_09_10_01.pdf
>
>
> Eric
>
> >    ----
> >    Joshua Davis
> >    Transient Infrastructure Security Solutions
> >
>
> Nice sig ;)
>
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