Distributed digital locked loops for time/frequency locking in packet-based wireless communication

Umberto Spagnolini, Nicola Varanese, Osvaldo Simeone, Yeheskel Bar-Ness

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

In infrastructure-less wireless systems network-wise time and frequency synchronization can be achieved by exchanging mutual synchronization errors among neighboring nodes. Cooperative synchronization is based on the use of distributed digital locked loops (D-DLLs), as the extension to distributed systems of the classical concept of (analog or digital) locked loops. The convergence to a synchronized state depends ultimately on the degree of connectivity of the network. D-DLLs can be specialized for time or frequency synchronization by adopting an appropriate error detector, but preserving the same control loop. The focus of this paper is on distributed frequency synchronization for packet-based communication. A novel detector is proposed, which approximates the local mean frequency error from the uncoordinated transmission of packets by neighboring nodes. The performance of distributed frequency locked loops (D-FLLs) is evaluated for a wireless network employing packet-based cooperative relaying. Numerical validations are used to compare different frequency synchronization protocols in terms of speed of convergence and degradation of end-to-end performances.

Original languageEnglish (US)
Title of host publication2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
DOIs
StatePublished - 2008
Event2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008 - Poznan, Poland
Duration: Sep 15 2008Sep 18 2008

Publication series

NameIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

Other

Other2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
CountryPoland
CityPoznan
Period9/15/089/18/08

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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