Blind turbo receivers with fast least-squares channel estimation and soft-feedback equalisation

Author

Loiola, Murilo B. ; Lopes, Renato R. ; Romano, Joao Marcos Travassos

Author_Institution

Centro de Eng., Modelagem e Cienc. Sociais Aplic. (CECS), Univ. Fed. do ABC (UFABC), Santo Andre, Brazil

Volume

46

Issue

21

fYear

2010

fDate

10/1/2010 12:00:00 AM

Firstpage

1464

Lastpage

1465

Abstract

Low-complexity blind turbo receivers composed of a soft-feedback equaliser (SFE) and fast least-squares (FLS) channel estimators are proposed. To reduce the complexity of the SFE computation, a function approximation is proposed instead of numerical algorithms in a specific step of the equaliser´s computation. Concerning FLS channel estimators, a specific filter parameters initialisation procedure is proposed in each turbo iteration to avoid possible numerical instabilities. Estimation of noise variance is also considered. The proposed scheme can perform as the turbo equaliser with perfect channel knowledge from a certain signal-to-noise ratio.

Keywords

blind equalisers; channel estimation; iterative methods; least squares approximations; radio receivers; fast least-squares channel estimation; function approximation; low-complexity blind turbo receivers; noise variance estimation; numerical algorithms; signal-to-noise ratio; soft-feedback equalisation; turbo iteration;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2010.1819

Filename

5604812