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Distributed Consensus Over Wireless Sensor Networks Affected by Multipath Fading

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2 Author(s)
Scutari, G. ; Dept. of Infocom, Univ. of Rome La Sapienza, Rome ; Barbarossa, S.

The design of sensor networks capable of reaching a consensus on a globally optimal decision test, without the need for a fusion center, is a problem that has received considerable attention in the last years. Many consensus algorithms have been proposed, with convergence conditions depending on the graph describing the interaction among the nodes. In most works, the graph is undirected and there are no propagation delays. Only recently, the analysis has been extended to consensus algorithms incorporating propagation delays. In this correspondence, we propose a consensus algorithm able to converge to a globally optimal decision statistic, using a wideband wireless network, governed by a fairly simple MAC mechanism, where each link is a multipath, frequency-selective, channel. The main contribution of the correspondence is to derive necessary and sufficient conditions on the network topology and sufficient conditions on the channel transfer functions guaranteeing the exponential convergence of the consensus algorithm to a globally optimal decision value, for any bounded delay condition.

Published in:

Signal Processing, IEEE Transactions on  (Volume:56 ,  Issue: 8 )

Date of Publication:

Aug. 2008

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