Bit error rate estimation for turbo decoding

Author

Letzepis, Nick ; Grant, Alex

Author_Institution

Inst. for Telecommun. Res., Univ. of South Australia, Adelaide, SA

Volume

57

Issue

3

fYear

2009

fDate

3/1/2009 12:00:00 AM

Firstpage

585

Lastpage

590

Abstract

In this paper we propose a method for on-line estimation of bit error rate during turbo decoding. We model the log-likelihood ratios as a mixture of two Gaussian random variables and derive estimators for the mean and variance of these distributions based on a maximum-likelihood approach. The parameter estimates are then employed to calculate the cross-over area of the Gaussian tails to estimate BER at each decoder iteration. The performance of the BER estimator is analysed and compared.

Keywords

error statistics; maximum likelihood decoding; maximum likelihood estimation; turbo codes; BER; Gaussian random variables; bit error rate estimation; decoder iteration; log-likelihood ratios; maximum-likelihood approach; parameter estimation; turbo decoding; Bit error rate; Convergence; Estimation error; Iterative decoding; Maximum likelihood decoding; Maximum likelihood estimation; Parameter estimation; Performance analysis; Probability density function; Signal to noise ratio; Turbo codes, iterative decoding, BER estimation, Log-likelihood ratio, Gaussian approximation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2009.03.060410

Filename

4799028