Hi Nick: On Wed, 2020-06-24 at 17:39 -0700, Nick Foster wrote: > Hi, > > I'm finally getting around to doing some more CPM work
I forgot to mention, my company found the GMSK demoulation technique found in this paper: https://www.researchgate.net/publication/241629765_Coherent_demodulation_of_AIS-GMSK_signals_in_co-channel_interference coupled with the "method 0" CFO correction in this paper: https://www.researchgate.net/publication/290776860_Preprocessing_AIS_Signals_for_Demodulation_in_Co-Channel_Interference along with analog RF components in front of an SDR, and precise timing with a GPSDO w/PPS to aid in looking for preambles, gave us fantastic results for AIS reception in GNURadio. Although it required quite a few custom blocks. Anyway, Douglas Nelson seems to have a lot of cool papers available in the public: https://www.researchgate.net/profile/Douglas_Nelson8 Regards, Andy > Best, > Nick
