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dc.contributor.authorŞenol, Habib
dc.contributor.authorCirpan, Hakan Ali
dc.contributor.authorPanayırcı, Erdal
dc.date.accessioned2019-06-28T11:11:43Z
dc.date.available2019-06-28T11:11:43Z
dc.date.issued2005
dc.identifier.issn1687-1472en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1678
dc.identifier.urihttps://doi.org/10.1155/WCN.2005.163
dc.description.abstractThis paper first proposes a computationally efficient pilot-aided linear minimum mean square error (MMSE) batch channel estimation algorithm for OFDM systems in unknown wireless fading channels. The proposed approach employs a convenient representation of the discrete multipath fading channel based on the Karhunen-Loeve (KL) orthogonal expansion and finds MMSE estimates of the uncorrelated KL series expansion coefficients. Based on such an expansion no matrix inversion is required in the proposed MMSE estimator. Moreover optimal rank reduction is achieved by exploiting the optimal truncation property of the KL expansion resulting in a smaller computational load on the estimation algorithm. The performance of the proposed approach is studied through analytical and experimental results. We then consider the stochastic Cramér-Rao bound and derive the closed-form expression for the random KL coefficients and consequently exploit the performance of the MMSE channel estimator based on the evaluation of minimum Bayesian MSE. We also analyze the effect of a modelling mismatch on the estimator performance. To further reduce the complexity we extend the batch linear MMSE to the sequential linear MMSE estimator. With the fast convergence property and the simple structure the sequential linear MMSE estimator provides an attractive alternative to the implementation of channel estimator.en_US]
dc.language.isoengen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectChannel estimationen_US
dc.subjectMMSE estimationen_US
dc.subjectOFDM systemsen_US
dc.titleA low-complexity KL expansion-based channel estimator for OFDM systemsen_US
dc.typearticleen_US
dc.identifier.startpage163en_US
dc.identifier.endpage174
dc.relation.journalEurasip Journal on Wireless Communications and Networkingen_US
dc.identifier.issue2
dc.identifier.volume2005en_US
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Bilgisayar Mühendisliği Bölümüen_US
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik-Elektronik Mühendisliği Bölümüen_US
dc.identifier.doi10.1155/WCN.2005.163en_US
dc.identifier.scopus2-s2.0-24344497394en_US
dc.institutionauthorŞenol, Habiben_US
dc.institutionauthorPanayirci, Erdalen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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