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dc.contributor.authorVajapeyam, Madhavan  Concept link
dc.contributor.authorVedantam, Satish  Concept link
dc.contributor.authorMitra, Urbashi  Concept link
dc.contributor.authorPreisig, James C.  Concept link
dc.contributor.authorStojanovic, Milica  Concept link
dc.date.accessioned2009-06-15T13:33:57Z
dc.date.available2009-06-15T13:33:57Z
dc.date.issued2008-10
dc.identifier.citationIEEE Journal of Oceanic Engineering 33 (2008): 489-501en
dc.identifier.urihttps://hdl.handle.net/1912/2848
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): 489-50, doi:10.1109/JOE.2008.2005338.en
dc.description.abstractIn resource limited, large scale underwater sensor networks, cooperative communication over multiple hops offers opportunities to save power. Intermediate nodes between source and destination act as cooperative relays. Herein, protocols coupled with space-time block code (STBC) strategies are proposed and analyzed for distributed cooperative communication. Amplify-and-forward-type protocols are considered, in which intermediate relays do not attempt to decode the information. The Alamouti-based cooperative scheme proposed by Hua (2003) for flat-fading channels is generalized to work in the presence of multipath, thus addressing a main characteristic of underwater acoustic channels. A time-reversal distributed space-time block code (TR-DSTBC) is proposed, which extends the dual-antenna TR-STBC (time-reversal space-time block code) approach from Lindskog and Paulraj (2000) to a cooperative communication scenario for signaling in multipath. It is first shown that, just as in the dual-antenna STBC case, TR along with the orthogonality of the DSTBC essentially allows for decoupling of the vector intersymbol interference (ISI) detection problem into separate scalar problems, and thus yields strong performance (compared with single-hop communication) and with substantially reduced complexity over nonorthogonal schemes. Furthermore, a performance analysis of the proposed scheme is carried out to provide insight on the performance gains, which are further confirmed via numerical results based on computer simulations and field data experiments.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherIEEEen
dc.relation.urihttps://doi.org/10.1109/JOE.2008.2005338
dc.subjectCooperative diversity methodsen
dc.subjectMultiple-input– multiple-output (MIMO) fading channelsen
dc.subjectUnderwater sensor networksen
dc.titleDistributed space–time cooperative schemes for underwater acoustic communicationsen
dc.typeArticleen
dc.identifier.doi10.1109/JOE.2008.2005338


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