RE: [Discuss-gnuradio] How to decode the convolutional code in the GRC

[intermilan]

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: address@hidden
> To: address@hidden; address@hidden
>
> 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 <address@hidden>:
> > 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.
> >
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> > address@hidden
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> >
> >