NDLI: Efficient frequency invariant beamforming using virtual arrays

Content Provider	IEEE Xplore Digital Library
Author	Pal, P. Vaidyanathan, P.P.
Copyright Year	2010
Description	Author affiliation: Dept. of Electrical Engineering, MC 136-93, California Institute of Technology, Pasadena, 91125, USA (Pal, P.; Vaidyanathan, P.P.)
Abstract	In wideband array processing, frequency invariant beamforming provides a popular means to make the beampattern allpass with respect to frequency. Traditionally, such beampatterns are realized as a two dimensional filter, using tapped delay-line (TDL) filters following each spatial sensor. However it has been recently shown that with the help of a rectangular antenna array, it is possible to generate fixed frequency invariant beampatterns without using filters. In this paper, this concept is generalized to the case of two dimensional arrays with elements on a (possibly nonseparable) lattice. Since performance of the frequency invariant beamformer depends on the number of sensors which could be large for a 2D array of size M × N, a novel approach to beamforming based on the difference co-array of a physical array is also proposed, which avoids use of additional physical sensors. The realization of the frequency invariant beams using second order statistics of the impinging signal with only M + N physical sensors, instead of the two dimensional array of size M×N, is demonstrated. The usefulness of the proposed method is verified through computer $simulation.^{1}$
Starting Page	1097
Ending Page	1101
File Size	485018
Page Count	5
File Format	PDF
ISBN	9781424497225
ISSN	10586393
e-ISBN	9781424497218
DOI	10.1109/ACSSC.2010.5757573
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Sensor arrays Lattices Wideband Narrowband Jamming Antenna arrays Difference co-array Frequency Invariant Beamforming Two Dimensional Array Lattice
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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