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Energy-Constrained Distributed Estimation in Wireless Sensor Networks

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2 Author(s)
Junlin Li ; School of Electrical and Computer Engineering, Georgia Institute of Technology. Email: lijunlin@ece.gatech.edu ; A1Regib, Ghassan

We consider distributed parameter estimation in energy-constrained wireless sensor networks, where limited energy is allowed to be used by all sensors at each task period. Thus there exists a tradeoff between the number of active sensors and the energy used by each active sensor to minimize the estimation MSE. To determine the optimal energy scheduling of each sensor, a concept of the equivalent unit-energy MSE function is introduced. Based on this concept, an optimal distributed estimation algorithm for homogeneous sensor networks and a quasi-optimal distributed estimation algorithm for heterogeneous sensor networks are proposed. Moreover, a theoretical non-achievable lower bound of the estimation MSE under the total energy constraint is proved and it is shown that our proposed algorithm is quasi-optimal and within a factor 2 of the theoretical lower bound. Simulation results also show that a significant reduction in the estimation MSE is achieved by the proposed method when compared with other uniform schemes.

Published in:

Military Communications Conference, 2007. MILCOM 2007. IEEE

Date of Conference:

29-31 Oct. 2007