A Novel Method for Partially Adaptive Broadband Beamforming

Authors: Liu W.; Weiss S.; Hanzo L.

Source: The Journal of VLSI Signal Processing, Volume 33, Number 3, March 2003 , pp. 337-344(8)

Publisher: Springer

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Abstract:

In this paper, a novel subband-selective generalized sidelobe canceller (GSC) for partially adaptive broadband beamforming is proposed. The blocking matrix of the GSC is constructed such that its columns constitute a series of bandpass filters, which select signals with specific angles of arrival and frequencies. This results in bandlimited spectra of the blocking matrix outputs, which is further exploited by a subband decomposition prior to running independent unconstrained adaptive filters in each non-redundant subband. We discuss the design of both the blocking matrix using a genetic algorithm for an efficient sum-of-power-of-two coefficient format and the filter bank for the subsequent subband decomposition. By these steps, the computational complexity of our subband-selective GSC is greatly reduced compared to other adaptive GSC schemes, while performance is comparable or even enhanced due to subband decorrelation, as simulations indicate.

Keywords: broadband beamforming; subband processing; adaptive filters; low complexity implementation

Language: English

Document Type: Research article

Affiliations: 1: Department of Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK

Publication date: 2003-03-01