A Simplified Log-MAP Algorithm for Turbo Equalization

Author

Talakoub, S. ; Sabeti, L. ; Shahrrava, B. ; Ahmadi, M.

Author_Institution

Dept. of Electr. & Comput. Eng., Windsor Univ., Ont.

Volume

3

fYear

2005

fDate

16-19 May 2005

Firstpage

1591

Lastpage

1595

Abstract

A simplification of the Log-MAP algorithm for turbo equalization is presented. The simplified algorithm is based on the MacLaurin series expansion of the logarithmic term in the Jacobian logarithmic function used in the Log-MAP algorithm. In terms of complexity the proposed algorithm can easily be implemented using adders and comparators as this is the case for the Max-Log-MAP algorithm. Also, simulation results show that the proposed algorithm has performance very close to the Log-MAP algorithm for turbo equalization, even in a high loss intersymbol interference (LSI) channel where there is a wide gap between the performance of the Log-MAP and the Max Log-MAP turbo equalizers

Keywords

equalisers; intersymbol interference; iterative decoding; turbo codes; Jacobian logarithmic function; Log-MAP algorithm; MacLaurin series expansion; intersymbol interference channel; iterative detection; max-Log-MAP algorithm; turbo equalization; Approximation algorithms; Binary phase shift keying; Equalizers; Finite impulse response filter; Frequency; Intersymbol interference; Iterative algorithms; Iterative decoding; Matched filters; Performance loss; Log-MAP algorithm; Log-MAP approximation; MAP algorithm; Max Log-MAP algorithm; iterative detection; turbo equalization;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2005. IMTC 2005. Proceedings of the IEEE

Conference_Location

Ottawa, Ont.

Print_ISBN

0-7803-8879-8

Type

conf

DOI

10.1109/IMTC.2005.1604435

Filename

1604435