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Signal Strength Localization Bounds in Ad Hoc and Sensor Networks when Transmit Powers are Random

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2 Author(s)
Patwari, N. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI ; Hero, A.O.

Sensor localization bounds have been derived assuming that received signal strength (RSS) measurements are performed with perfectly known sensor transmit powers. In this paper the Bayesian Cramer-Rao bound is derived assuming transmit powers are random with known prior distribution. Further, both directional measurements on each link, from i to j and from j to i, and their correlation, are explicitly considered. Results show that random transmit powers have a small (5-13%) impact on coordinate estimation bounds. However, using only the average of the directional measurements can significantly increase these bounds

Published in:

Sensor Array and Multichannel Processing, 2006. Fourth IEEE Workshop on

Date of Conference:

12-14 July 2006

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