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Fifth International Symposium on Signal Processingand its Applications, ISSPA `99, Brisbane,Australia, 22-25 August, 1999
 

Summary: Fifth International Symposium on Signal Processingand its Applications,
ISSPA `99, Brisbane,Australia, 22-25 August, 1999
Organisedby the Signal ProcessingResearch Centre, QUT, Brisbane,Australia
~~ ~
NEARFIELDBROADBANDADAPTIVE BEAMFORMING
ThusharaD.Abhayapala Rodney A. Kennedy
TelecommunicationsEng. Group, RSISE
The Institute of Advanced Studies
AustralianNational University
ACT 0200 Australia
ABSTRACT
A nearfield broadband adaptive beamforming approach
based on the modal expansion of the solutionto the spheri-
cal wave equation is formulated. It provides an efficientpa-
rameterization for the nearfield beamforming problem with
a single parameter to focus the beamformer to a desired
operating radius and a set of modal coefficients to con-
trol the angular response. As a consequence, the adaptive
beamfonnerhas a frequencyinvariantresponsefor nearfield
sources, decorrelates coherent interferers (thus combating

  

Source: Abhayapala, Thushara D. - Department of Information Engineering, Australian National University

 

Collections: Computer Technologies and Information Sciences