Hi, I am trying to get a better understanding of different receiver blocks. In the ais-tools-gnuradio-1.0.2 (http://funwithelectronics.com/sdr/ais.php) source code (aisrcv-usrp.py), once symbols are mapped to bits after demodulation and symbol clock recovery the signal is sent to the following blocks: gr.diff_decoder_bb() and ais.invert10_bb() I suppose gr.diff_decoder_bb() is a differential decoder and ais.invert10_bb() only inverts bits (a 0 becomes a 1 and inversely). Am I wrong? I have done some documentation research on AIS and the signal is NRZI encoded before modulation. I don’t understand how these blocks perform NRZI decoding. Can someone please give me a brief explanation? Thanks, Irene
-- View this message in context: http://www.nabble.com/NRZI-decoding-tp19389130p19389130.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
