Also, my understanding for the PLL blocks were that they were ideal for "strong carrier" signals like AM. When I say strong carrier i mean a signal that has an obvious carrier which isn't "hidden" under modulation..
Anyway, the GMSK block might be a good place to start. -John On Fri, Oct 17, 2014 at 7:35 AM, John Malsbury <jmalsbury.perso...@gmail.com > wrote: > It doesn't have frequency correction - I can probably follow up with some > ideas on how to implement that part. But the GMSK demod might do OK for > you initially. It doesn't do anything intelligent to deal with the data > shaping - its just a non-coherent slicer. > > If you want to design in GRC but keep your top-level application as is, > you can use a hier block. You can also use a command line parameter or > other mechanism to select your demodulator at start-time for easy > comparisons. > > [typed one handed.. my daughter has my other and] > > -John > > On Fri, Oct 17, 2014 at 7:08 AM, Luke Berndt <l...@robotastic.com> wrote: > >> Thanks for looking into it! To be honest, I am not really good at RF. I >> based my code off the python code in gr-smartnet. The fsk-demod python file >> is here: >> https://github.com/bistromath/gr-smartnet/blob/master/src/python/fsk_demod.py >> >> It is quite possible that it just happened to work because of an error >> that got patched in Gr 3.7. >> >> Are there some good examples for GMSK/FSK demodulation that I could >> borrow from instead? >> >> Recreating this in GRC sounds like a great idea so I can scope along the >> way. I will give that a try next. >> >> Thanks again for the pointers, fresh eyes are really helpful when you >> have been staring at it for so long. >> >> - Luke >> >> On Fri, Oct 17, 2014 at 8:18 AM, Martin Braun <martin.br...@ettus.com> >> wrote: >> >>> On 10/17/2014 08:28 AM, John Malsbury wrote: >>> > Also also, is the Band-Edge FLL ideal for GMSK? My possibly, incorrect >>> > understanding of that block is that it was more ideal for PAM with >>> > common RRC. >>> >>> For the record: It might work coincidentally because of the rolloff-y >>> shape of GMSK, but it's derived for and designed for common PAM/RRC, as >>> John says and I wouldn't recommend it for anything else. >>> To look up the math, I suggest Harris' works. >>> >>> >>> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >
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