Meteor-M2 signal analysis: supporting material to http://jmfriedt.free.fr/glmf_meteor_eng.pdf presented at FOSDEM2019.
extrait.s is a sample data acquisition: soft bits encoded as signed 8-bit integers (char)
go_viterbi1.m (GNU/Octave) will search for all possible permutation of the header bits to identify the QPSK phase rotation in the dataset
The output should look like
with correlation peaks every 16384 samples for one of the constellation rotation/permutation state.
go_viterbi2.m aims at demonstrating how the synchronization header is encoded (demonstrated with some dummy sentence to justify the correlation word used in go_viterbi1.m)
viterbi.m convolutional encoding decoder taken from https://github.com/Filios92/Viterbi-Decoder/blob/master/viterbi.m