Structured variational methods for distributed inference in wireless ad hoc and sensor networks

Authors:
Yanbing Zhang;Huaiyu Dai
Affiliations:
Department of Electrical and Computer Engineering, NC State University, Raleigh, USA;Department of Electrical and Computer Engineering, NC State University, Raleigh, USA
Venue:
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Year:
2009

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Structured variational methods for distributed inference: convergence analysis and performance-complexity tradeoff

ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2

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Abstract

In this paper, a variational message passing framework is proposed for Markov random fields, which is computationally more efficient and admits wider applicability compared to the belief propagation algorithm. Based on this framework, structured variational methods are explored to take advantage of both the simplicity of variational approximation (for inter-cluster processing) and the accuracy of exact inference (for intra-cluster processing). Its performance is elaborated on a Gaussian Markov random field, through both theoretical analysis and simulation results.