Fractional delay and fractional doppler estimation and mitigation framework in otfs systems

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dc.contributor.authorZegrar, Salah Eddine
dc.contributor.authorSümer, Ahmet Sacid
dc.contributor.authorArslan, Hüseyin
dc.date.accessioned2025-10-01T07:41:58Z
dc.date.available2025-10-01T07:41:58Z
dc.date.issued2025
dc.departmentİstanbul Medipol Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü
dc.description.abstractOrthogonal time-frequency space (OTFS) modulation is fast becoming a popular modulation scheme for high-mobility wireless communication due to its ability to render time-varying channels invariant and sparse. However, due to the limited time duration and frequency bandwidth of the transmitted OTFS signal, the occurrence of fractional delay and Doppler shifts becomes inevitable, causing both inter-delay interference (IDeI) and inter-Doppler interference (IDI). In this paper, an impulse-based channel estimation method is used, which takes advantage of the fact that the pilot impulse is a pulse tone (pulsone). A pulsone maintains its shape despite time delay and Doppler shift operations, as well as being self-dual between time and frequency domains. Exploiting these two features, a low-complexity algorithm is proposed to estimate the fractional delay and fractional Doppler channel. We derive the Cramer-Rao lower bound (CRLB) of the estimated fractional channel and show that the developed estimator is efficient. Then, we provide the computational complexity analysis of the proposed algorithm. After that, we show and stress that the proposed channel estimation scheme is better in terms of the channel normalized mean squared error (NMSE) and the bit-error rate (BER). Lastly, the simulation results are confirmed via real experimental results.
dc.description.sponsorshipTürkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)
dc.identifier.citationZegrar, S. E., Sümer, A. S. ve Arslan, H. (2025). Fractional delay and fractional doppler estimation and mitigation framework in otfs systems. IEEE Transactions on Vehicular Technology, 74(2), 2884-2896. http://dx.doi.org/10.1109/TVT.2024.3470839
dc.identifier.doi10.1109/TVT.2024.3470839
dc.identifier.endpage2896
dc.identifier.issn0018-9545
dc.identifier.issn1939-9359
dc.identifier.issue2
dc.identifier.scopus2-s2.0-85205925839
dc.identifier.scopusqualityQ1
dc.identifier.startpage2884
dc.identifier.urihttp://dx.doi.org/10.1109/TVT.2024.3470839
dc.identifier.urihttps://hdl.handle.net/20.500.12511/13063
dc.identifier.volume74
dc.identifier.wosWOS:001422005800005
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorZegrar, Salah Eddine
dc.institutionauthorSümer, Ahmet Sacid
dc.institutionauthorArslan, Hüseyin
dc.institutionauthorid0000-0002-0536-4159
dc.institutionauthorid0000-0001-8866-8520
dc.institutionauthorid0000-0001-9474-7372
dc.language.isoen
dc.relation.ispartofIEEE Transactions on Vehicular Technology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.relation.tubitakinfo:eu-repo/grantAgreement/TUBITAK/SOBAG/123E514
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectChannel Estimation
dc.subjectFractional Delay
dc.subjectFractional Doppler
dc.subjectInter-Delay Interference
dc.subjectInter-Doppler Interference (IDI)
dc.subjectOTFS
dc.subjectPulsone
dc.titleFractional delay and fractional doppler estimation and mitigation framework in otfs systems
dc.typeArticle

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