A Multiple Time Scale Modularized Adaptive Beamformer


Journal Article

This paper analyzes the cascaded equivalent form of the min imum variance distortionless response (MVDR) beamformer. A unique feature of the modularized MVDR (M2 VDR) beamformer is the ability to distribute adaptive degrees of freedom (DOF) among beamformer stages. This property of the M2 VDR beamformer allows DOF to be adapted over different time scales. As a consequence of the multiple stage decomposition adaptive beamformer weights appear in a form which suggest an apparent increase in the number of DOF. To properly analyze this case an alternative interpretation of adaptive DOF is introduced to establish the equivalence between the MVDR beamformer and its cascaded realization. In the second part of this paper the distribution for the output power estimate of a P stage M2 VDR beamformer is derived. Analysis reveals the necessity of placing constraints on the adaptation time assigned to each beamformer stage. Simulation experiments are presented that demonstrate the applicability of the M2 VDR beamformer in resolving closely spaced sources under impulsive interference conditions. © 1994 IEEE

Full Text

Duke Authors

Cited Authors

  • Niezgoda, GH; Krolik, JL

Published Date

  • January 1, 1994

Published In

Volume / Issue

  • 42 / 5

Start / End Page

  • 1251 - 1256

Electronic International Standard Serial Number (EISSN)

  • 1941-0476

International Standard Serial Number (ISSN)

  • 1053-587X

Digital Object Identifier (DOI)

  • 10.1109/78.295189

Citation Source

  • Scopus