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dc.contributor.authorŞenol, Habib
dc.contributor.authorCirpan, Hakan Ali
dc.contributor.authorPanayirci, Erdal
dc.date.accessioned2019-06-28T11:11:43Z
dc.date.available2019-06-28T11:11:43Z
dc.date.issued2005
dc.identifier.issn16871472
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1678
dc.identifier.urihttps://dx.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.
dc.language.isoEnglish
dc.subjectChannel estimation
dc.subjectMMSE estimation
dc.subjectOFDM systems
dc.titleA low-complexity KL expansion-based channel estimator for OFDM systems
dc.typeArticle
dc.identifier.startpage163
dc.identifier.endpage174
dc.relation.journalEurasip Journal on Wireless Communications and Networking
dc.identifier.issue2
dc.identifier.volume2005
dc.identifier.doi10.1155/WCN.2005.163
dc.contributor.khasauthorŞenol, Habib
dc.contributor.khasauthorPanayirci, Erdal


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