Extrinsic information in iterative decoding: a unified view

Author

Colavolpe, Giulio ; Ferrari, Gianluigi ; Raheli, Riccardo

Author_Institution

Dipt. di Ingegneria dell´´Inf., Parma Univ., Italy

Volume

49

Issue

12

fYear

2001

fDate

12/1/2001 12:00:00 AM

Firstpage

2088

Lastpage

2094

Abstract

We address the use of the extrinsic information generated by each component decoder in an iterative decoding process. The BJCR algorithm proposed by Bahl et al. (1974) and the soft-output Viterbi algorithm (SOVA) are considered as component decoders. In both cases, we consider, in a unified view, various feedback schemes which use the extrinsic information in different fashions. Numerical results for a classical rate-1/2 turbo code and a serially concatenated code transmitted over a memoryless additive white Gaussian noise (AWGN) channel are provided. The performance of the considered schemes leads to interesting remarks about the nature of the extrinsic information

Keywords

AWGN channels; Viterbi decoding; concatenated codes; convolutional codes; feedback; iterative decoding; memoryless systems; turbo codes; AWGN channel; BCJR algorithm; RSC codes; SOVA; feedback; iterative decoding; memoryless additive white Gaussian noise channel; recursive systematic convolutional codes; serially concatenated; soft-output Viterbi algorithm; turbo codes; AWGN; Additive white noise; Associate members; Concatenated codes; Convolutional codes; Feedback; Iterative algorithms; Iterative decoding; Turbo codes; Viterbi algorithm;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.974255

Filename

974255