A broadband unit-circle MVDR beamformer with spatial adaptive canceller

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Ebong, Frank E. and Weiss, Stephan and Tonello, Andrea M.; (2026) A broadband unit-circle MVDR beamformer with spatial adaptive canceller. In: ICASSP 2026 - 2026 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, ESP, pp. 1-5. ISBN 979-8-3315-6701-9 (https://doi.org/10.1109/ICASSP55912.2026.11460875)

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Abstract

We present a broadband unit-circle minimum variance distortionless response (UC-MVDR) beamformer and its extension with a spatial unit-circle generalized sidelobe canceller (UC-GSC). The proposed approach enforces per-bin unit-circle projection of polynomial zeros obtained from SMI-MVDR and GSC weights, thereby restoring the ensemble zero property while preserving the distortionless main-lobe constraint. Simulation results with multiple wideband interferers demonstrate that UC-MVDR achieves deeper and more stable notches than conventional spatial GSC, while UC-GSC further enhances interference suppression without compromising white noise gain. Both methods maintain positive WNG across the entire band, confirming unit-circle rectification as an efficient and robust strategy for broadband beamforming.

ORCID iDs

Ebong, Frank E., Weiss, Stephan ORCID logoORCID: https://orcid.org/0000-0002-3486-7206 and Tonello, Andrea M.;
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