#define POLYA   0x6d
#define POLYB   0x4f


If I modify viterbi.c in gr-fec/viterbi (swapping the polynomial coefficients)
#define POLYB   0x6d
#define POLYA   0x4f
then
$ xxd word.bin
00000000: 1acf fc1d 0000 0000                      ........
and
$ cat word.bin | ./encode > t
then t is
0000 0011 0101 1101 0100 1001 1100 0010 0100 1111 1111 0010 0110 1000 0110
  0    3    5    D    4    9    C    2    4    F    F    2    6    8    6...
=-0xfca2b63db00d9794
so while I am not sure I understand why ones and zeros are swapped using this
encoding, it does seem to me that the two polynomial coefficients of the
LRPT code are swapped in this example.

JM


--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000 Besancon, France

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