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Supermodular Game for Power Control in TOA-Based Positioning | IEEE Journals & Magazine | IEEE Xplore

Supermodular Game for Power Control in TOA-Based Positioning


Abstract:

In this paper, we address the problem of minimizing the energy cost of positioning nodes in a wireless sensor network, using time of arrival measurements. A sensor needs ...Show More

Abstract:

In this paper, we address the problem of minimizing the energy cost of positioning nodes in a wireless sensor network, using time of arrival measurements. A sensor needs to receive at least three distance measurements to known anchors in order to position itself. The accuracy of its position estimation depends on the signal to noise ratio of the beacons from the anchor nodes, whose power levels are to be selected according to a two-fold criterion: minimum power level and desired positioning quality for users, determined by the error covariance metric. We derive a solution based on modeling the positioning problem as a non-cooperative game. We show that the resulting game is supermodular and that it possesses a unique Nash equilibrium, which can be quickly reached with best response dynamics. Finally, in the numerical results we find the price of anarchy of our game.
Published in: IEEE Transactions on Signal Processing ( Volume: 61, Issue: 12, June 2013)
Page(s): 3246 - 3259
Date of Publication: 19 April 2013

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