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Overlap-save frequency invariant generalised sidelobe canceller

Koh, C.L. and Weiss, S. (2005) Overlap-save frequency invariant generalised sidelobe canceller. In: 8th International Symposium on Signal Processing and Its Applications, 2005-08-28 - 2005-08-31.

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In this paper, we propose a frequency invariant adaptive broadband beamformer based on an overlap-save frequency domain implementation of the generalised sidelobe canceller (GSC). Broadband signals drawn from a nested array are decomposed into frequency bins which are grouped into octaves. Subsequently, frequency dependent weighting assigned to individual frequency bins restricts the variation in spatial resolution usually associated with broadband arrays of fixed aperture. A GSC beamformer is incorporated to achieve adaptive nulling of interferers, but requires modifications to the constraint equation of the standard GSC in order to account for the frequency-dependent weighting of sensors. Simulation results highlighting the benefits of the proposed approach are presented.