Low complexity turbo equalization based on soft feedback interference cancellation

Author

Vogelbruch, Fabian ; Haar, Sven

Author_Institution

Inst. for Integrated Syst.-BridgeLab., Munich Univ. of Technol., Germany

Volume

9

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

586

Lastpage

588

Abstract

This letter presents a new soft feedback interference cancellation (SFIC) based equalizer suitable for iterative receivers applying turbo equalization. SFIC offers a very low computational complexity depending only linearly on the channel memory length. Despite its low complexity, SFIC shows a very good BER performance. Simulation results for the severely intersymbol interference distorted Proakis C channel show, that our approach performs within 0.5 dB to the powerful turbo equalization scheme based on MMSE linear filtering with time-varying coefficients and fails the mathematical optimum maximum a-posteriori (MAP) equalizer only by 1.2 dB.

Keywords

equalisers; error statistics; filtering theory; interference suppression; intersymbol interference; iterative methods; least mean squares methods; radio receivers; signal detection; BER; MMSE linear filtering; SFIC; bit error rate; channel memory length; distorted Proakis C-channel; intersymbol interference; iterative receivers; soft feedback interference cancellation; turbo equalization; AWGN; Computational complexity; Equalizers; Feedback; Information filtering; Interference cancellation; Intersymbol interference; Maximum likelihood detection; Maximum likelihood estimation; Nonlinear filters;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2005.1461672

Filename

1461672