Serial concatenated convolutional codes: Difference between revisions

Revision as of 18:27, 4 June 2014

Revision as of 02:23, 9 June 2014

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[[File:SCCC_Encoder.png|thumb|none|500px|Fig. 1. SCCC Encoder]]

The example encoder is comprisedcomposed of a 16-state outer convolutional code and a 2-state inner convolutional code linked by an interleaver. The natural code rate of the configuration shown is 1/4, however, the inner and/or outer codes may be punctured to achieve higher codes rates as needed. For example, an overall code rate of 1/2 may be achieved by puncturing the outer convolutional code to rate 3/4 and the inner convolutional code to rate 2/3.

A recursive inner convolutional code is preferable for turbo decoding of the SCCC. The inner code may be punctured to a rate as high as 1/1 with reasonable performance.