"Adaptive Pilot Patterns for CA-OFDM Systems in Non-stationary Wireless Channels"

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dc.contributor.authorRao, Raghunandan M.en
dc.contributor.authorMarojevic, Vuken
dc.contributor.authorReed, Jeffrey H.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2017-11-13T15:38:06Zen
dc.date.available2017-11-13T15:38:06Zen
dc.date.issued2017-09-12en
dc.description.abstractIn this paper, we investigate the performance gains of adapting pilot spacing and power for Carrier Aggregation (CA)-OFDM systems in nonstationary wireless channels. In current multi-band CAOFDM wireless networks, all component carriers use the same pilot density, which is designed for poor channel environments. This leads to unnecessary pilot overhead in good channel conditions and performance degradation in the worst channel conditions. We propose adaptation of pilot spacing and power using a codebook-based approach, where the transmitter and receiver exchange information about the fading characteristics of the channel over a short period of time, which are stored as entries in a channel profile codebook. We present a heuristic algorithm that maximizes the achievable rate by finding the optimal pilot spacing and power, from a set of candidate pilot configurations. We also analyze the computational complexity of our proposed algorithm and the feedback overhead. We describe methods to minimize the computation and feedback requirements for our algorithm in multi-band CA scenarios and present simulation results in typical terrestrial and air-to ground/ air-to-air nonstationary channels. Our results show that significant performance gains can be achieved when adopting adaptive pilot spacing and power allocation in nonstationary channels. We also discuss important practical considerations and provide guidelines to implement adaptive pilot spacing in CAOFDM systems.en
dc.description.notesfalse (Extension publication?)en
dc.description.versionAccepted versionen
dc.format.extent1 - 1 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1109/TVT.2017.2751548en
dc.identifier.issn0018-9545en
dc.identifier.issue99en
dc.identifier.orcidReed, J [0000-0003-3494-1901]en
dc.identifier.urihttp://hdl.handle.net/10919/80346en
dc.identifier.volumePPen
dc.language.isoenen
dc.publisherIEEEen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.title"Adaptive Pilot Patterns for CA-OFDM Systems in Non-stationary Wireless Channels"en
dc.title.serialIEEE Transactions on Vehicular Technologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dcterms.dateAccepted2017-09-03en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/Electrical and Computer Engineeringen
pubs.organisational-group/Virginia Tech/Faculty of Health Sciencesen

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