Performance of multilevel-turbo codes with blind/non-blind equalization over WSSUS multipath channels

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dc.contributor.authorUçan, Osman N.
dc.contributor.authorBuyukatak, Kenan
dc.contributor.authorGöse, Ersin
dc.contributor.authorOsman, Onur
dc.contributor.authorOdabaşıoğlu, Niyazi
dc.date.accessioned2020-11-21T15:53:46Z
dc.date.available2020-11-21T15:53:46Z
dc.date.issued2006en_US
dc.departmentİstanbul Ticaret Üniversitesien_US
dc.description.abstractIn this paper, in order to improve error performance, we introduce a new type of turbo codes, called 'multilevel-turbo codes (ML-TC)' and we evaluate their performance over wide-sense stationary uncorrelated scattering (WSSUS) multipath channels. The basic idea of ML-TC scheme is to partition a signal set into several levels and to encode each level separately by a proper component of the turbo encoder. In the considered structure, the parallel input data sequences are encoded by our multilevel scheme and mapped to any modulation type such as MPSK, MQAM, etc. Since WSSUS channels are very severe fading environments, it is needed to pass the received noisy signals through non-blind or blind equalizers before turbo decoders. In ML-TC schemes, noisy WSSUS corrupted signal sequence is first processed in equalizer block, then fed into the first level of turbo decoder and the first sequence is estimated from this first Turbo decoder. Subsequently, the other following input sequences of the frame are computed by using the estimated input bit streams of previous levels. Here, as a ML-TC example, 4PSK 2 level-turbo codes (2L-TC) is chosen and its error performance is evaluated in WSSUS channel modelled by COST 207 (Cooperation in the field of Science & Technology, Project #207). It is shown that 2L-TC signals with equalizer blocks exhibit considerable performance gains even at lower SNR values compared to 8PSK-turbo trellis coded modulation (TTCM). The simulation results of the proposed scheme have up to 5.5 dB coding gain compared to 8PSK-TTCM for all cases. It is interesting that after a constant SNR value, 2L-TC with blind equalizer has better error performance than non-blind filtered schemes. We conclude that our proposed scheme has promising results compared to classical schemes for all SNR values in WSSUS channels. Copyright © 2005 John Wiley & Sons, Ltd.en_US
dc.identifier.doi10.1002/dac.752en_US
dc.identifier.endpage297en_US
dc.identifier.issn1074-5351
dc.identifier.issue3en_US
dc.identifier.scopus2-s2.0-33646087452en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage281en_US
dc.identifier.urihttps://doi.org/10.1002/dac.752
dc.identifier.urihttps://hdl.handle.net/11467/3679
dc.identifier.volume19en_US
dc.identifier.wosWOS:000236976200003en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.relation.ispartofInternational Journal of Communication Systemsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectCOST207en_US
dc.subjectEVAen_US
dc.subjectMultilevel-turbo codesen_US
dc.subjectWSSUSen_US
dc.titlePerformance of multilevel-turbo codes with blind/non-blind equalization over WSSUS multipath channelsen_US
dc.typeArticleen_US

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