Iterative MAP decoding for serial concatenated convolutional codes

Author

Ambroze, A. ; Wade, G. ; Tomlinson, M.

Author_Institution

Satellite Centre, Plymouth Univ., UK

Volume

145

Issue

2

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

53

Lastpage

59

Abstract

The paper provides detailed computational steps for implementing an iterative serial concatenated convolutional code (SCCC) decoder. These are based on maximum a posteriori probability (MAP) decoding of a single, rate 1/2, recursive, systematic convolutional code, which is reduced to easily implemented equations for forward and backward recursion. In particular, the crucial information exchange between MAP decoders is clarified. Simulation of a rate 1/3 SCCC with memory-2 codes and a coding delay of N=1000 shows a bit error rate of 10^-6 for E_b/N₀=1.5 dB, and gives a typical interleaver gain of N^-3

Keywords

concatenated codes; convolutional codes; delays; error statistics; iterative methods; maximum likelihood decoding; recursive estimation; MAP decoders; MAP decoding; SCCC decoder; backward recursion; bit error rate; coding delay; computational steps; forward recursion; information exchange; interleaver gain; iterative MAP decoding; maximum a posteriori probability decoding; memory-2 code; rate 1/2 recursive systematic convolutional code; rate 1/3 SCCC; serial concatenated convolutional codes;

fLanguage

English

Journal_Title

Communications, IEE Proceedings-

Publisher

iet

ISSN

1350-2425

Type

jour

DOI

10.1049/ip-com:19981876

Filename

677586