Problem in using trellis Error correction en- and decoder

GNU Radio
1

Hello ,

 I am using trellis encoder and trellis viterbi block, to get a

error corecction method.
i take a snapshot for you:
http://img213.imageshack.us/img213/3435/pantallazoxe.png
The flow:
—>Packet Encoder—>DBPSK Encoder–>DBPSK Decoder—>Packet
Decoder---->
works perfect.
Problem is trellis encoder input and trellis viterbi decoder output
do not match.
why don’t match?
I, read the documentation about the FSM file format. ( in gr-trellis
directory)
the example, in the directory don’t work (FILE error).
Need i chunks to symbols block as the example?
Thanks in advance
Francisco

2

please change the “prefix” variable in this grc graph to the
absolute path of your gnuradio tree.
Eg, in my machine it is
“/home/anastas/gnuradio_trunk/”

Also, you might want to put a throttle somewhere.

Achilleas