Improved EXIT Analysis for Turbo Decoding

Author

Tsai, Tsung-Ru ; Tseng, Der-Feng ; Han, Yunghsiang S. ; Pai, Hung-Ta

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan

Volume

15

Issue

9

fYear

2011

fDate

9/1/2011 12:00:00 AM

Firstpage

995

Lastpage

997

Abstract

Extrinsic information transfer (EXIT) chart is a useful tool for analyzing iterative decoding behavior. One crucial challenge in realizing it is that a precise estimate of the probability density function (PDF) of the extrinsic information at the output of a soft-input soft-output decoder must be made to obtain mutual information. To achieve this, we employed a kernel density estimator (KDE), as opposed to using the traditional histogram estimator, when a fairly small interleaver size is available. Simulation results showed that the KDE approach outperformed the histogram method for estimating the PDF in the EXIT band analysis in terms of bit error rate prediction.

Keywords

error statistics; iterative decoding; turbo codes; BER; EXIT band analysis; bit error rate prediction; extrinsic information transfer chart; histogram method; iterative decoding behavior; kernel density estimator; mutual information; probability density function; soft-input soft-output decoder; turbo decoding; Decoding; Estimation; Histograms; Kernel; Signal to noise ratio; Trajectory; Turbo codes; EXIT chart; Turbo code; histogram; kernel density estimation;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2011.071811.110842

Filename

5962069