SSP'05 -- Proceedings

	IEEE/SP 13th workshop on Statistical Signal Processing July, 17-20, 2005 - Bordeaux - France

Information regarding the paper

Title

Constant Beamwidth Generalised Sidelobe Canceller

Author(s)

Choo Leng Koh	University of Southampton
Stephan Weiss	University of Southampton

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Abstract

In this paper, we proposed a constant beamwidth discrete Fourier transform (DFT) beamformer based on the generalised sidelobe canceller (GSC). Broadband signals are decomposed into frequency bins which are grouped into octaves and tapered individually. The resulting beampattern possesses constant beamwidth across the entire operating spectrum, thus ensuring uniform spatial resolution. Further incorporation of the GSC allows adaptive nulling of interference to coincide with uniform resolution, enhancing the beamformer's performance. However, modification to the constraint equation of the standard GSC is required to account for the frequency-dependent weighting of sensors.