Ben:
Thanks for your reply.I knew that block you mentioned.And I know if I use
the block chunks_to_symbols after the trellis_encoder,that parameter
constellation should be the same as the parameter symbol_table in the
chunks_to_symbols.And I think this is TCM.
But in my flow graph,there is no chunks_to_symbols block,then I do not
know how to set that parameter, so I do not know how to decode the data.Do you
know how to set that parameter constellation in the block
trellis_viterbi_combined if I used this block in my flow graph?
inter
> Date: Thu, 10 Mar 2011 22:33:36 -0700
> Subject: Re: [Discuss-gnuradio] How to decode the convolutional code in the
> GRC
> From: [email protected]
> To: [email protected]; [email protected]
>
> You probably want to use the trellis_viterbi_combined block.
>
> The documentation for the trellis blocks is in
> gnuradio/gr-trellis/doc/gr-trellis.xml.
> (if you have xmlto installed then an html file is also built.)
>
> Ben
>
> 2011/3/10 intermilan <[email protected]>:
> > Hi all:
> > Now I want to use the Trellis_encoder block in the GRC to make an
> > example for the convolutional code.In my opinion, I use Trellis_encoder to
> > produce the convolutional code, then make the convolutional code through
> > the modulator and demodulator(such as DPSK), finally use some block to
> > decode the convolutional code to get the original data.But after the data
> > get out the demodulator,I do not know how to decode it.
> > Here is the flow graph I used:
> >
> > vector_source->throttle->Packed_to_Unpacked->Trellis_encoder->Packet_encoder->DPSK_mod->DPSK_demod->Packet_decoder->?
> > Can anyone tell me which block I should use after the Packet_decoder to
> > decode the convolutional code?
> >
> >
> > Thank you in advance.
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > [email protected]
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
> >
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