A soft-input soft-output APP module for iterative decoding of concatenated codes

Concatenated coding schemes consist of the combination of two or more simple constituent encoders and interleavers. The parallel concatenation known as "turbo code" has been shown to yield remarkable coding gains close to theoretical limits, yet admitting a relatively simple iterative deco...

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Bibliographic Details
Published in:IEEE communications letters 1997-01, Vol.1 (1), p.22-24
Main Authors: Benedetto, S., Divsalar, D., Montorsi, G., Pollara, F.
Format: Article
Language:English
Subjects:
Capacity planning
Concatenated codes
Convolutional codes
Interleaved codes
Iterative algorithms
Iterative decoding
Laboratories
Propulsion
Space technology
Turbo codes
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Summary:Concatenated coding schemes consist of the combination of two or more simple constituent encoders and interleavers. The parallel concatenation known as "turbo code" has been shown to yield remarkable coding gains close to theoretical limits, yet admitting a relatively simple iterative decoding technique. The recently proposed serial concatenation of interleaved codes may offer superior performance to that of turbo codes. In both coding schemes, the core of the iterative decoding structure is a soft-input soft-output (SISO) a posteriori probability (APP) module. In this letter, we describe the SISO APP module that updates the APP's corresponding to the input and the output bits, of a code, and show how to embed it into an iterative decoder for a new hybrid concatenation of three codes, to fully exploit the benefits of the proposed SISO APP module.
ISSN:1089-7798
1558-2558
DOI:10.1109/4234.552145