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A Subband-Selective Broadband GSC with Cosine-Modulated Blocking Matrix

A Subband-Selective Broadband GSC with Cosine-Modulated Blocking Matrix
A Subband-Selective Broadband GSC with Cosine-Modulated Blocking Matrix
In this paper, a novel subband-selective generalized sidelobe canceller (GSC) 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 angles of arrival and frequencies. This results in highpass-type bandlimited spectra of the blocking matrix outputs, which is further exploited by subbands decomposition and suitably discarding the low-pass subbands prior to running independent unconstrained adaptive filters in each non-redundant subband. By these steps, the computational complexity of a GSC implementation is greatly reduced compared to fully adaptive GSC schemes, while performance is comparable or even enhanced due to subband decorrelation in both spatial and temporal domains.
0018-926X
813-820
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. (2004) A Subband-Selective Broadband GSC with Cosine-Modulated Blocking Matrix. IEEE Transactions on Antennas and Propagation, 52 (3), 813-820.

Record type: Article

Abstract

In this paper, a novel subband-selective generalized sidelobe canceller (GSC) 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 angles of arrival and frequencies. This results in highpass-type bandlimited spectra of the blocking matrix outputs, which is further exploited by subbands decomposition and suitably discarding the low-pass subbands prior to running independent unconstrained adaptive filters in each non-redundant subband. By these steps, the computational complexity of a GSC implementation is greatly reduced compared to fully adaptive GSC schemes, while performance is comparable or even enhanced due to subband decorrelation in both spatial and temporal domains.

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Published date: March 2004
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 259298
URI: https://eprints.soton.ac.uk/id/eprint/259298
ISSN: 0018-926X
PURE UUID: 72dc279f-a878-437c-be68-81ec7fe3a8ff
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 28 Apr 2004
Last modified: 20 Jul 2019 01:26

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