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Subband-Selective Partially Adaptive Broadband Beamforming with Cosine-Modulated Blocking Matrix

Subband-Selective Partially Adaptive Broadband Beamforming with Cosine-Modulated Blocking Matrix
Subband-Selective Partially Adaptive Broadband Beamforming with Cosine-Modulated Blocking Matrix
A novel subband-selective generalized sidelobe canceller (GSC) with cosine-modulation for partially adaptive broadband beamforming is proposed. The columns of the blocking matrix are derived from a prototype vector by cosine-modulation, and the broadside constraint is incorporated by imposing zeros on the prototype vector appropriately. These columns constitute a series of bandpass filters, which select signals with specific direction of arrivals and frequencies. This results in highpass-type bandlimited spectra of the blocking matrix outputs, which is further exploited by subband decomposition and discarding the lowpass subbands appropriately prior to running independent unconstrained adaptive filters in each non-redundant subband. By these steps, the computational complexity of our GSC implementation is greatly reduced compared to fully adaptive GSC schemes, while performance is comparable or even enhanced due to subband decorrelation in both the spatial and temporal domain.
2913-2916
Liu, W.
af656440-51e8-45c8-b694-a802e71b671e
Weiss, S.
55a13123-6604-4dad-b647-7347683c8c49
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Liu, W.
af656440-51e8-45c8-b694-a802e71b671e
Weiss, S.
55a13123-6604-4dad-b647-7347683c8c49
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1

Liu, W., Weiss, S. and Hanzo, L. (2002) Subband-Selective Partially Adaptive Broadband Beamforming with Cosine-Modulated Blocking Matrix. of ICASSP'02, United States. pp. 2913-2916 .

Record type: Conference or Workshop Item (Paper)

Abstract

A novel subband-selective generalized sidelobe canceller (GSC) with cosine-modulation for partially adaptive broadband beamforming is proposed. The columns of the blocking matrix are derived from a prototype vector by cosine-modulation, and the broadside constraint is incorporated by imposing zeros on the prototype vector appropriately. These columns constitute a series of bandpass filters, which select signals with specific direction of arrivals and frequencies. This results in highpass-type bandlimited spectra of the blocking matrix outputs, which is further exploited by subband decomposition and discarding the lowpass subbands appropriately prior to running independent unconstrained adaptive filters in each non-redundant subband. By these steps, the computational complexity of our GSC implementation is greatly reduced compared to fully adaptive GSC schemes, while performance is comparable or even enhanced due to subband decorrelation in both the spatial and temporal domain.

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More information

Published date: May 2002
Additional Information: Event Dates: May 2002 Organisation: IEEE Address: Orlando, Florida
Venue - Dates: of ICASSP'02, United States, 2002-05-01
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 257487
URI: http://eprints.soton.ac.uk/id/eprint/257487
PURE UUID: 1f7f5d47-c2ed-45bb-a418-b22b94793c03
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 11 Dec 2003
Last modified: 05 Nov 2019 02:07

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