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      • Department of Electrical and Electronics Engineering
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      Positioning algorithms for cooperative networks in the presence of an unknown turn-around time

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      Author(s)
      Gholami, M.R.
      Gezici, Sinan
      Ström, E.G.
      Rydström, M.
      Date
      2011
      Source Title
      2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications
      Publisher
      IEEE
      Pages
      166 - 170
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      This paper addresses the problem of single node positioning in cooperative network using hybrid two-way time-of-arrival and time-difference-of-arrival where, the turn-around time at the target node is unknown. Considering the turn-around time as a nuisance parameter, the derived maximum likelihood estimator (MLE) brings a difficult global optimization problem due to local minima in the cost function of the MLE. To avoid drawbacks in solving the MLE, we obtain a linear two-step estimator using non-linear pre-processing which is algebraic and closed-form in each step. To compare different methods, Cramér-Rao lower bound (CRLB) is derived. Simulation results confirm that the proposed linear estimator attains the CRLB for sufficiently high signal-to-noise ratios. © 2011 IEEE.
      Keywords
      Cooperative positioning
      Global optimization problems
      High signal-to-noise ratio
      Linear estimators
      Local minimums
      Lower bounds
      Maximum likelihood estimator
      Non-linear
      Nuisance parameter
      Positioning algorithms
      Pre-processing
      Simulation result
      Target nodes
      Time-difference-of-arrival
      Time-of-arrival
      Estimation
      Fading (radio)
      Global optimization
      Maximum likelihood estimation
      Signal processing
      Signal to noise ratio
      Wireless telecommunication systems
      Wireless sensor networks
      Permalink
      http://hdl.handle.net/11693/28347
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/SPAWC.2011.5990386
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      • Department of Electrical and Electronics Engineering 3702
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