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Titolo: On the computation of an averaged coherence function
Autore: Brushe, GD; Waller, JR;
 Indirizzi:
 Def Sci & Technol Org, Signals Anal Discipline, Commun Div, Salisbury, SA 5108, Australia Def Sci & Technol Org Salisbury SA Australia 5108 ury, SA 5108, Australia
 Titolo Testata:
 DIGITAL SIGNAL PROCESSING
fascicolo: 2,
volume: 11,
anno: 2001,
pagine: 110  119
 SICI:
 10512004(200104)11:2<110:OTCOAA>2.0.ZU;26
 Fonte:
 ISI
 Lingua:
 ENG
 Keywords:
 averaged cross spectra; coherence function; averaging complex numbers; polar and Cartesian coordinates;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Engineering, Computing & Technology
 Citazioni:
 6
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Brushe, GD Def Sci & Technol Org, Signals Anal Discipline, Commun Div, POB1500, Salisbury, SA 5108, Australia Def Sci & Technol Org POB 1500 Salisbury SA Australia 5108 alia



 Citazione:
 G.D. Brushe e J.R. Waller, "On the computation of an averaged coherence function", DIGIT SIG P, 11(2), 2001, pp. 110119
Abstract
The coherence function provides a measure of the statistical independence of two stochastic processes and is computed by using the cross spectrum andauto spectra of those processes. This paper examines the computation of anaveraged coherence function from multiple blocks of data obtained from twosensors. In signal detection theory, it is generally assumed that the channels through which a signal passes are widesense stationary. However, in practical situations this assumption may not be valid and the signal may actually have passed through nonstationary phase channels. This paper demonstrates that in these situations it may be better to average the cross spectrum (used to compute the coherence function) in the polar coordinate system instead of the Cartesian coordinate system. It is demonstrated that averaging the coherence function under the Cartesian coordinate system can produce an averaged estimate that is inconsistent with the meaning of the individual coherence functions that have been averaged. However, averaging the coherence function under the polar coordinate system produces an averaged coherence function that is consistent with the meaning of the individual coherence functions that have been averaged. (C) 2001 Academic Press.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 07:34:21