Distributed frequency-locked loops for wireless networks

Document Type

Article

Publication Date

12-1-2011

Abstract

The establishment of a common frequency reference in a distributed wireless network is a critical factor in enabling any degree of node cooperation in communication and sensing functions. In this paper we introduce Distributed Frequency-Locked Loops (D-FLL's) to control the carrier frequencies of autonomous nodes with wireless communication capabilities. A novel frequency difference detector (FDD) is introduced allowing each node to estimate the frequency difference with respect to the ensemble of its neighbors. D-FLL's are characterized in terms of stability and tracking accuracy when the synchronization network has a peer-to-peer (mutually coupled - MC) or hierarchical (master slave - MS) topology. In particular, synchronization error accumulates in MS architectures as the distance from the reference node increases. MC architectures, instead, trade slower convergence times for a smoother error distribution. Overall, D-FLL's prove to be a robust and accurate technique for carrier frequency synchronization purposes that can be readily employed with any network architecture. © 2011 IEEE.

Identifier

84655164810 (Scopus)

Publication Title

IEEE Transactions on Communications

External Full Text Location

https://doi.org/10.1109/TCOMM.2011.101011.100458

ISSN

00906778

First Page

3440

Last Page

3451

Issue

12

Volume

59

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