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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