A delay-tolerant asynchronous two-way-relay system over doubly-selective fading channels

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dc.citation.epage3865en_US
dc.citation.issueNumber7en_US
dc.citation.spage3850en_US
dc.citation.volumeNumber14en_US
dc.contributor.authorSalim, A.en_US
dc.contributor.authorDuman, T. M.en_US
dc.date.accessioned2016-02-08T09:48:54Z
dc.date.available2016-02-08T09:48:54Z
dc.date.issued2015en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractWe consider design of asynchronous orthogonal frequency division multiplexing (OFDM) based diamond two-way-relay (DTWR) systems in a time-varying frequency-selective (doubly-selective) fading channel. In a DTWR system, two users exchange their messages with the help of two relays. Most of the existing works on asynchronous DTWR systems assume only small relative propagation delays between the received signals at each node that do not exceed the length of the cyclic-prefix (CP). However, in certain practical communication systems, significant differences in delays may take place, and hence existing solutions requiring excessively long CPs may be highly inefficient. In this paper, we propose a delay-independent CP insertion mechanism in which the CP length depends only on the number of subcarriers and the maximum delay spread of the corresponding channels. We also propose a symbol detection algorithm that is able to tolerate very long relative delays, that even exceed the length of the OFDM block itself, without a large increase in complexity. The proposed system is shown to significantly outperform other alternatives in the literature through a number of specific examples. © 2015 IEEE.en_US
dc.identifier.doi10.1109/TWC.2015.2413776en_US
dc.identifier.issn1536-1276
dc.identifier.urihttp://hdl.handle.net/11693/21625
dc.language.isoEnglishen_US
dc.publisherInstitute of Electrical and Electronics Engineers Inc.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/TWC.2015.2413776en_US
dc.source.titleIEEE Transactions on Wireless Communicationsen_US
dc.subjectOFDMen_US
dc.subjectTwo-way relay channelsen_US
dc.subjectCommunication channels (information theory)en_US
dc.subjectFading channelsen_US
dc.subjectFrequency division multiplexingen_US
dc.subjectMultiuser detectionen_US
dc.subjectOrthogonal frequency division multiplexingen_US
dc.subjectSignal detectionen_US
dc.subjectSynchronizationen_US
dc.subjectUnderwater acousticsen_US
dc.subjectDoubly selective fading channelsen_US
dc.subjectInsertion mechanismen_US
dc.subjectMaximum delay spreaden_US
dc.subjectPropagation delaysen_US
dc.subjectTime-varying frequencyen_US
dc.subjectTwo-way relay channelsen_US
dc.subjectTwo-way relay systemsen_US
dc.subjectUnderwater acoustic communicationsen_US
dc.subjectFrequency selective fadingen_US
dc.titleA delay-tolerant asynchronous two-way-relay system over doubly-selective fading channelsen_US
dc.typeArticleen_US
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