EM based MAP iterative channel estimation for turbo coded SFBC-OFDM systems

Hakan Dogan, Hakan A. Çirpan, Erdal Panayirci

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We consider the design of turbo receiver structures for space-frequency block coded (SFBC-) OFDM systems in unknown frequency selective fading channels. The Turbo receiver structures for SFBC-OFDM systems under consideration consists of an iterative MAP Expectation/Maximization (EM) channel estimation algorithm, soft MMSE SFBC decoder and a soft MAP outer-channel-code decoder. MAP-EM employs iterative channel estimation and it improves receiver performance by re-estimating the channel after each decoder iteration. Moreover, the MAP-EM approach considers the channel variations as random processes and applies the Karhunen-Loeve (KL) orthogonal series expansion. The performance of the proposed approaches are studied in terms of mean square error and bit-error rate. Through experimental results, the effect of a pilot spacing on the channel estimator performance and sensitivity of turbo receiver structures on channel estimation error are studied.

Original languageEnglish
Title of host publicationTurbo Codes and Related Topics; 6th International ITG-Conference on Source and Channel Coding (TURBOCODING), 2006 4th International Symposium on
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9783800729470
Publication statusPublished - 2006
Externally publishedYes
Event6th International ITG-Conference on Source and Channel Coding and 2006 4th International Symposium on Turbo Codes and Related Topics, TURBOCODING 2006 - Munich, Germany
Duration: 3 Apr 20067 Apr 2006

Publication series

NameTurbo Codes and Related Topics; 6th International ITG-Conference on Source and Channel Coding (TURBOCODING), 2006 4th International Symposium on

Conference

Conference6th International ITG-Conference on Source and Channel Coding and 2006 4th International Symposium on Turbo Codes and Related Topics, TURBOCODING 2006
Country/TerritoryGermany
CityMunich
Period3/04/067/04/06

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