Optimal rate allocation for multi-sensor distributed estimation

Authors:
Junyong Chen
Affiliations:
College of Automation Science and Engineering, South China University of Technology, Guangzhou, China
Venue:
CCDC'09 Proceedings of the 21st annual international conference on Chinese Control and Decision Conference
Year:
2009

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Abstract

This paper studies the optimal rate allocation (ORA) problem for multi-sensor distributed estimation in wireless sensor networks (WSNs) where a total bit rate constraint is imposed. We adopt the mean-square error (MSE) as the the performance criterion of the designed distributed estimator, and search for the optimal rate allocation scheme through minimizing the upper bound of the designed estimator MSE. We consider the two-sensor case in WSN, and obtain a optimal rate allocation scheme, where the optimal bit rate of each sensor is basically determined by the local signal-to-noise ratio (SNR). Simulation results show that the optimal rate allocation scheme improves evidently on the simple uniform rate allocation scheme.