CONVOLUTIONAL CODING

GSM Glossary

GSM — Convolutional Coding

 

 

 

 

 

 

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Information on Convolutional Coding

Convolutional coding extends the concept of a block code to allow memory from block to block. Each encoded symbol is therefore a linear combination of information symbols in the current block and a selected number of preceding blocks.
     In convolutional coding the encoder operates not on disjoint blocks, but on a running block of bits held in a shift register, generating a sequence of higher rate. This procedure is normally used for error detection and correcting, but the correcting capabilities are not so easily quantified as for block codes. Probabilistic decoding, approximating maximum likelihood, is generally used.
     GSM uses a half-rate convolutional coder. The output of the channel coder is punctured to reduce the data rate.


Other topics in our resources on GSM related to Convolutional Coding include: 
 
  • Channel coding
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  • punctured convolutional code

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