Convolutional code: Difference between revisions

Revision as of 13:52, 30 April 2006

Revision as of 13:55, 30 April 2006

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The encoder on the picture above is a ''non-recursive'' encoder. Here's an example of a recursive one:

[[Image:Convolutional_encoder_recursive.png|frameleft|thumb|340px|none|rate 1/2 recursive, systematic convolutional encoder with constraint length 4]]

One can see that a data sequence being encoded is here a part of the output (encoded) sequence too (look at the output 2). Such codes are referred to as ''systematic'', other are called ''non-systematic''.