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Filter bank based fractional delay filter implementation for widely accurate broadband steering vectors

Alrmah, Mohamed Abubaker and Weiss, Stephan (2013) Filter bank based fractional delay filter implementation for widely accurate broadband steering vectors. In: The Fifth IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, 2013-12-15 - 2013-12-18.

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Abstract

Applications such as broadband angle of arrival estimation require the implementation of accurate broadband steering vectors, which generally rely on fractional delay filter designs. These designs commonly exhibit a rapidly decreasing performance as the Nyquist rate is approached. To overcome this, we propose a filter bank based approach, where standard fractional delay filters operate on a series of frequency-shifted oversampled subband signals, such that they appear in the filter's lowpass region. Simulations demonstrate the appeal of this approach.