Generalized EXIT chart and BER analysis of finite-length turbo codes

Author

Lee, Jeong W. ; Blahut, Richard E.

Author_Institution

Illinois Univ., Urbana, IL, USA

Volume

4

fYear

2003

fDate

1-5 Dec. 2003

Firstpage

2067

Abstract

We propose a tool for the analysis of the finite-length iterative turbo decoding algorithm. The proposed tool is a generalized EXIT (extrinsic information transfer) chart based on the mutual information transfer characteristics of the extrinsic information in the iterative turbo decoding algorithm. The proposed tool can describe the probabilistic convergence behavior of the iterative decoding algorithm. By using this tool, we obtain the BER estimates of the finite-length turbo codes in the form of a lower bound, which shows a gentle waterfall over a wide waterfall region. The obtained lower bound is in reasonable agreement with the BER obtained by simulations of the iterative decoding algorithm.

Keywords

convergence; error statistics; iterative decoding; parameter estimation; turbo codes; BER estimation; EXIT chart; extrinsic information transfer chart; finite-length iterative turbo decoding algorithm; finite-length turbo codes; gentle waterfall; iterative decoding algorithm; lower bound; mutual information transfer; probabilistic convergence behavior; wide waterfall; AWGN; Algorithm design and analysis; Bit error rate; Convergence; Information analysis; Iterative algorithms; Iterative decoding; Mutual information; Performance analysis; Turbo codes;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE

Print_ISBN

0-7803-7974-8

Type

conf

DOI

10.1109/GLOCOM.2003.1258600

Filename

1258600