The code at:
http://sourceforge.net/p/freetel/code/HEAD/tree/codec2/src/fdmdv.c#l1021
no worky... Change to:
for(c=0; c<Nc; c++) {
norm = 1.0/(cabsolute(prev_rx_symbols[c])+1E-6);
phase_difference[c] = cmult(cmult(rx_symbols[c],
fcmult(norm,cconj(prev_rx_symbols[c]))), pi_on_4);
}
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