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Summary: Proc. 19991EEE WorkshoponApplications of Signul Pmcessingto Audio anddcowiics, New Palfz,New York,Oct. 17-20,1999
ISOTROPIC NOISE MODELLING FOR NEARFIELD ARRAY PROCESSING
Thushara D.Abhayapala Rodney A. Kennedy Robert C. Williamson
Telecommunications Engineering Group
Research School of Information Sciences
and Engineering
The Institute of Advanced Studies
Australian National University
Canberra ACT 0200,Australia
thush@syseng.anu.edu.au
rodney.kennedy@anu.edu.au
ABSTRACT
In this paper, an exact series representation for a neareeld sphcri-
cally isotropic noise model is introduced. The inethodology uses
the spherical harmonics expansion of the wavelield at a sensor to
obtain the correlation between two sensors due to the nearfield
isotropic noise field. The result is useful in nearfield application
of sensor arrays. The proposed noise modcl can be utilized cf-
fectively to apply well established farfield array processing algo-
rithms for nearfield applications. Specifically, any signal process-
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