TDOA based positioning in the presence of unknown clock skew

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buir.contributor.authorGezici, Sinan
dc.citation.epage2534en_US
dc.citation.issueNumber6en_US
dc.citation.spage2522en_US
dc.citation.volumeNumber61en_US
dc.contributor.authorGholami, M. R.en_US
dc.contributor.authorGezici, Sinanen_US
dc.contributor.authorStrom, E. G.en_US
dc.date.accessioned2015-07-28T12:03:38Z
dc.date.available2015-07-28T12:03:38Z
dc.date.issued2013-06en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractThis paper studies the positioning problem of a single target node based on time-difference-of-arrival (TDOA) measurements in the presence of clock imperfections. Employing an affine model for the behaviour of a local clock, it is observed that TDOA based approaches suffer from a parameter of the model, called the clock skew. Modeling the clock skew as a nuisance parameter, this paper investigates joint clock skew and position estimation. The maximum likelihood estimator (MLE) is derived for this problem, which is highly nonconvex and difficult to solve. To avoid the difficulty in solving the MLE, we employ suitable approximations and relaxations and propose two suboptimal estimators based on semidefinite programming and linear estimation. To further improve the estimation accuracy, we also propose a refining step. In addition, the Cramer-Rao ´ lower bound (CRLB) is derived for this problem as a benchmark. Simulation results show that the proposed suboptimal estimators can attain the CRLB for sufficiently high signal-to-noise ratios.en_US
dc.identifier.doi10.1109/TCOMM.2013.032013.120381en_US
dc.identifier.issn0090-6778
dc.identifier.urihttp://hdl.handle.net/11693/12881
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/TCOMM.2013.032013.120381en_US
dc.source.titleIEEE Transactions on Communicationsen_US
dc.subjectWireless Sensor Networken_US
dc.subjectTime-difference-ofarrival (tdoa)en_US
dc.subjectClock Skewen_US
dc.subjectSemidefinite Programmingen_US
dc.subjectLinear Estimatoren_US
dc.subjectMaximum Likelihood Estimator (mle)en_US
dc.subjectCramer-rao ´ Lower Bound (crlb)en_US
dc.subjectPositioningen_US
dc.subjectClock Synchronizationen_US
dc.titleTDOA based positioning in the presence of unknown clock skewen_US
dc.typeArticleen_US

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