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dc.contributor.authorŞenol, Habib
dc.contributor.authorTepedelenlioğlu, Cihan
dc.date.accessioned2021-04-24T16:01:33Z
dc.date.available2021-04-24T16:01:33Z
dc.date.issued2021
dc.identifier.issn1053-587X
dc.identifier.urihttps://hdl.handle.net/20.500.12469/3998
dc.description.abstractIt is well-known that time-varying channels can provide time diversity and improve error rate performance compared to time-invariant fading channels. However, exploiting time diversity requires very accurate channel estimates at the receiver. In order to reduce the number of unknown channel coefficients while estimating the time-varying channel, basis expansion models can be used along with long transmission frames that contain multiple orthogonal frequency division multiplexing (OFDM) symbols that experience the channel variation. The design of these OFDM frames need to judiciously incorporate training and data insertions in the transmitted signal while maintaining orthogonality. In this work, we propose an inter channel interference (ICI)-free training model depending on pilot symbols only and provide a corresponding time-varying channel estimation method. This scheme relies on an algorithm to determine the number of OFDM symbols per frame and the number of basis functions per path with minimal information about the Doppler bandwidth. As a performance benchmark, Bayesian Cramer Rao lower bound (CRLB) and the corresponding MSE bound are derived analytically for the proposed training model. Theoretical MSE expressions of the proposed estimation scheme are also derived as well as the MSE expressions in the presence of Doppler frequency mismatch. Simulations exhibit substantial MSE improvement and the corresponding Symbol Error Rate (SER) performances of the low complexity estimation scheme. They also corroborate that, unlike the common results in the literature, an OFDM system can perform better as the Doppler frequency increases with judicious design of training and channel estimation schemes.en_US
dc.language.isoEnglishen_US
dc.publisherIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INCen_US
dc.subjectBasis expansion model (BEM)en_US
dc.subjectchannel estimationen_US
dc.subjectnull spaceen_US
dc.subjectorthogonal frequency-division multiplexing (OFDM)en_US
dc.subjectrapidly varying multipath channelen_US
dc.titleSubspace-Based Estimation of Rapidly Varying Mobile Channels for OFDM Systemsen_US
dc.typeArticleen_US
dc.identifier.startpage385en_US
dc.identifier.endpage400en_US
dc.relation.journalIEEE TRANSACTIONS ON SIGNAL PROCESSINGen_US
dc.identifier.volume69en_US
dc.identifier.wos000607794900005en_US
dc.identifier.doi10.1109/TSP.2020.3045562en_US
dc.contributor.khasauthorŞenol, Habiben_US


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