NDLI: Tuning the performance of the superdirective frequency-invariant beamforming applied to end-fire arrays

Content Provider	IEEE Xplore Digital Library
Author	Traverso, F. Crocco, M. Trucco, A. Vernazza, G.
Copyright Year	2011
Description	Author affiliation: Italian Institute of Technology (IIT), Genoa, Italy, Via Morego 30, 16163, Genova, Italy (Crocco, M.) \|\| Department of Biophysical and Electronic Engineering, University of Genoa, Via all'Opera Pia 11, 16145, Genova, Italy (Traverso, F.; Trucco, A.; Vernazza, G.)
Abstract	In this paper, starting from a frequency-invariant filter-and-sum beamformer, we propose and assess a technique to tune the trade-off between the directivity and the robustness of the related beam pattern, without the need to modify the designed FIR filters. Our technique can be seen as a post-synthesis optimization that allows to choose a given system performance, after the investigation of a wide space of realistic possibilities. It can be applied only to end-fire array and will be referred to as oversteering. The idea is to steer the beam pattern past end-fire (i.e., to steer the beam pattern outside the visible region) in order to tune the beamformer performance without actually change the main response axis of the array, which remains pointed to end-fire. The oversteering is obtained just by applying opportune delays to the signals received by the array transducers, and for each steering direction past end-fire a different balance between directivity and robustness occurs. By analyzing the results of the proposed technique it is possible to evaluate the effectiveness in producing frequency-invariant beam patterns with an end-fire looking direction and a number of interesting trade-offs between directivity and robustness.
Starting Page	1
Ending Page	7
File Size	1539275
Page Count	7
File Format	PDF
ISBN	9781457700866
e-ISBN	9781457700880
DOI	10.1109/Oceans-Spain.2011.6003579
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic beams Finite impulse response filter Cost function Robustness Array signal processing Sensor arrays Broadband communication
Content Type	Text
Resource Type	Article

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