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OFDM demodulation in underwater time-reversed shortned channels

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dc.contributor.authorGomes, João
dc.contributor.authorSilva, A.
dc.contributor.authorJesus, S. M.
dc.date.accessioned2014-10-09T13:37:25Z
dc.date.available2014-10-09T13:37:25Z
dc.date.issued2008
dc.description.abstractThis work addresses the problem of OFDM transmission in dispersive underwater channels where impulse responses lasting tens of miliseconds cannot be reliably handled by recently proposed methods due to limitations of channel estimation algorithms. The proposed approach relies on passive time reversal for multichannel combining of observed waveforms at an array of sensors prior to OFDM processing, which produces an equivalent channel with a shorter impulse response that can be handled much more easily. A method for tracking the narrowband residual phase variations of the channel after Doppler preprocessing is proposed. This is a variation of an existing technique that can improve the spectral efficiency of OFDM by reducing the need for pilot symbols. This work also examines techniques to handle sparse impulse responses and proposes a channel estimation method where an l1 norm is added to the standard least-squares cost function to transparently induce sparseness in the vector of channel coefficients. Algorithms are assessed using data collected during the UAB’07 experiment, which was conducted in Trondheim fjord, Norway, in September 2007. Data were transmitted with bandwidths of 1.5 and 4.5 kHz, and recorded at a range of about 800 m in a 16-hydrophone array. Significant multipath was observed over a period of at least 30 ms.por
dc.description.sponsorshipFCTpor
dc.identifier.citationJ.P. GOMES, A. SILVA and S.M. JESUS, ''OFDM Demodulation in Underwater Time-Reversed Shortned Channels'' in OCEANS'08, Quebec, Canada, pp. 1-8, September.por
dc.identifier.doihttp://dx.doi.org/ 10.1109/OCEANS.2008.5152034
dc.identifier.isbn978-1-4244-2619-5
dc.identifier.isbn978-1-4244-2620-1
dc.identifier.otherAUT: ASI00912; SJE00662;
dc.identifier.urihttp://hdl.handle.net/10400.1/5234
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherIEEE Explorepor
dc.relationPHITOM - Probabilistic High-Frequency Ocean Tomography for Underwater Communications and Navigation
dc.relation.publisherversionhttp://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5152034&tag=1por
dc.subjectBandwidthpor
dc.subjectChannel estimationpor
dc.subjectCost functionpor
dc.subjectDemodulationpor
dc.subjectDispersionpor
dc.subjectNarrowbandpor
dc.subjectOFDM modulationpor
dc.subjectQuadrature phase shift keyingpor
dc.subjectSensor arrayspor
dc.subjectUnderwater communicationpor
dc.titleOFDM demodulation in underwater time-reversed shortned channelspor
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitlePHITOM - Probabilistic High-Frequency Ocean Tomography for Underwater Communications and Navigation
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FEEA-TEL%2F71263%2F2006/PT
oaire.citation.conferencePlaceQuebecpor
oaire.citation.endPage8por
oaire.citation.startPage1por
oaire.citation.titleOCEANS 2008por
oaire.fundingStream3599-PPCDT
person.familyNameSilva
person.familyNameJesus
person.givenNameAntónio
person.givenNameSergio
person.identifier.ciencia-idEB17-11D8-E7BD
person.identifier.orcid0000-0002-1724-7777
person.identifier.orcid0000-0002-6021-1761
person.identifier.ridN-6554-2013
person.identifier.scopus-author-id55846463600
person.identifier.scopus-author-id7003729485
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublication564df7bf-2e6e-46bf-a80b-d37570d3b78d
relation.isAuthorOfPublicatione0226ece-3767-4beb-ab80-868e8897c14a
relation.isAuthorOfPublication.latestForDiscovery564df7bf-2e6e-46bf-a80b-d37570d3b78d
relation.isProjectOfPublicationc9b222f1-9894-4dc9-8b11-a673666e34fb
relation.isProjectOfPublication.latestForDiscoveryc9b222f1-9894-4dc9-8b11-a673666e34fb

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