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      • Department of Electrical and Electronics Engineering
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      Enhanced position estimation via node cooperation

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      Author
      Sahinoglu, Z.
      Gezici, Sinan
      Date
      2010
      Source Title
      2010 IEEE International Conference on Communications
      Print ISSN
      0536-1486
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
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      Abstract
      Two-way time-of-arrival (TW-ToA) is a widely used ranging protocol that can provide the distance between two devices without time synchronization. One drawback of the TW-ToA is poor positioning accuracy in the absence of a sufficient number of reference ranging devices. Also, for a self-positioning system with a limited battery life, it might be necessary to limit the number of transmissions while satisfying accuracy constraints. In this paper, a cooperative positioning protocol [1] is studied, which can improve positioning accuracy compared to the conventional TW-ToA based positioning systems and also facilitate positioning with fewer packet transmissions; hence, it can prolong battery life on average. The maximum likelihood estimator is obtained for the cooperative technique and the limits on the positioning accuracy are quantified in terms of the Cramer-Rao lower bound (CRLB). Simulation results are provided in order to show performance improvements. ©2010 IEEE.
      Keywords
      Cooperative positioning
      Cramer-Rao lower bound (CRLB)
      Maximum likelihood
      Time-of-arrival (ToA)
      Battery life
      Cooperative positioning
      Cramer-rao lower bound
      Maximum likelihood estimator
      Node cooperation
      Packet transmissions
      Performance improvements
      Position estimation
      Positioning accuracy
      Positioning system
      Self-positioning
      Simulation result
      Time synchronization
      Time-of-arrival
      Cramer-Rao bounds
      Maximum likelihood estimation
      Permalink
      http://hdl.handle.net/11693/28558
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ICC.2010.5502319
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      • Department of Electrical and Electronics Engineering 3524
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