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dc.contributor.authorPanayırcı, Erdal
dc.contributor.authorŞenol, Habib
dc.contributor.authorUysal, Murat
dc.contributor.authorPoor, H. Vincent
dc.date.accessioned2019-06-27T08:02:07Z
dc.date.available2019-06-27T08:02:07Z
dc.date.issued2016
dc.identifier.issn1053-587X
dc.identifier.issn1941-0476
dc.identifier.urihttps://hdl.handle.net/20.500.12469/551
dc.identifier.urihttps://doi.org/10.1109/TSP.2015.2477807
dc.description.abstractThis paper is concerned with a challenging problem of channel estimation and equalization for amplify-and-forward cooperative relay based orthogonal frequency division multi-plexing (OFDM) systems in sparse underwater acoustic (UWA) channels. The sparseness of the channel impulse response and prior information for the non-Gaussian channel gains modeled by an exact continuous Gaussian mixture (CGM) are exploited to improve the performance of the channel estimation algorithm. The resulting novel algorithm initially estimates the overall sparse complex-valued channel taps from the source to the destination as well as their locations using the matching pursuit (MP) approach. The effective time-domain non-Gaussian noise is approximated well as a Gaussian noise in the frequency-domain where the estimation takes place. An efficient and low complexity algorithm is developed based on a combination of the MP and the maximum a posteriori probability (MAP) based space-alternating generalized expectation-maximization technique to improve the estimates of the channel taps and their locations in an iterative manner. Computer simulations show that the UWA channel is estimated very effectively and the proposed algorithm exhibits excellent symbol error rate and channel estimation performance.
dc.language.isoEnglish
dc.publisherIEEE-INST Electrical Electronics Engineers Inc
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectAF relaying
dc.subjectContinuous Gaussian Mixture
dc.subjectMatching Pursuit
dc.subjectOFDM
dc.subjectSage
dc.subjectUnderwater Acoustic Channel Estimation
dc.titleSparse Channel Estimation and Equalization for OFDM-Based Underwater Cooperative Systemsw with Amplify-and-Forward Relaying
dc.typeArticle
dc.identifier.startpage214
dc.identifier.endpage228
dc.relation.journalIEEE Transactions on Signal Processing
dc.identifier.issue1
dc.identifier.volume64
dc.identifier.wosWOS:000366834300016
dc.identifier.doi10.1109/TSP.2015.2477807
dc.contributor.khasauthorPanayırcı, Erdal


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