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dc.contributor.authorLi, Baosheng  Concept link
dc.contributor.authorZhou, Shengli  Concept link
dc.contributor.authorStojanovic, Milica  Concept link
dc.contributor.authorFreitag, Lee E.  Concept link
dc.contributor.authorWillett, Peter  Concept link
dc.date.accessioned2009-01-02T19:50:52Z
dc.date.available2009-01-02T19:50:52Z
dc.date.issued2008-04
dc.identifier.citationIEEE Journal of Oceanic Engineering 33 (2008): 198-209en
dc.identifier.urihttps://hdl.handle.net/1912/2632
dc.descriptionAuthor Posting. © IEEE, 2008. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 33 (2008): 198-209, doi:10.1109/JOE.2008.920471.en
dc.description.abstractUnderwater acoustic (UWA) channels are wideband in nature due to the small ratio of the carrier frequency to the signal bandwidth, which introduces frequency-dependent Doppler shifts. In this paper, we treat the channel as having a common Doppler scaling factor on all propagation paths, and propose a two-step approach to mitigating the Doppler effect: 1) nonuniform Doppler compensation via resampling that converts a "wideband" problem into a "narrowband" problem and 2) high-resolution uniform compensation of the residual Doppler. We focus on zero-padded orthogonal frequency-division multiplexing (OFDM) to minimize the transmission power. Null subcarriers are used to facilitate Doppler compensation, and pilot subcarriers are used for channel estimation. The receiver is based on block-by-block processing, and does not rely on channel dependence across OFDM blocks; thus, it is suitable for fast-varying UWA channels. The data from two shallow-water experiments near Woods Hole, MA, are used to demonstrate the receiver performance. Excellent performance results are obtained even when the transmitter and the receiver are moving at a relative speed of up to 10 kn, at which the Doppler shifts are greater than the OFDM subcarrier spacing. These results suggest that OFDM is a viable option for high-rate communications over wideband UWA channels with nonuniform Doppler shifts.en
dc.description.sponsorshipB. Li and S. Zhou are supported by the ONR YIP grant N00014-07-1-0805 and the NSF grant ECCS-0725562. M. Stojanovic is supported by the ONR grant N00014-07-1-0202. L. Freitag is supported by the ONR grants N00014- 02-6-0201 and N00014-07-1-0229. P. Willett is supported by the ONR grant N00014-07-1-0055.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherIEEEen
dc.relation.urihttps://doi.org/10.1109/JOE.2008.920471
dc.subjectUnderwater acoustic communicationen
dc.subjectMulticarrier modulationen
dc.subjectOFDMen
dc.subjectWideband channelsen
dc.titleMulticarrier communication over underwater acoustic channels with nonuniform Doppler shiftsen
dc.typeArticleen
dc.identifier.doi10.1109/JOE.2008.920471


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