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Driving innovations in manufacturing: Open Access research from DMEM

Strathprints makes available Open Access scholarly outputs by Strathclyde's Department of Design, Manufacture & Engineering Management (DMEM).

Centred on the vision of 'Delivering Total Engineering', DMEM is a centre for excellence in the processes, systems and technologies needed to support and enable engineering from concept to remanufacture. From user-centred design to sustainable design, from manufacturing operations to remanufacturing, from advanced materials research to systems engineering.

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Self-orthogonalizing overlap-save GSC

Koh, C.L. and Weiss, S. and Peterson, J.M. and Bharitkar, S. (2005) Self-orthogonalizing overlap-save GSC. In: 39th Asilomar Conference on Signals, Systems and Computers, 1900-01-01.

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Abstract

This paper discusses a computationally inexpensive and fast converging approach to broadband beamforming. Exemplarily utilising the generalised sidelobe canceller (GSC), accurate low-cost implementations in the DFT domain based on overlap-save techniques have been previously suggested, which however suffer from slow convergence when used in combination with the least mean squares algorithm. To overcome this limitation, the beamformer proposed here exploits decorrelation of the input signal within the overlap-save architecture. By inclusion of a self-orthogonalizing component into the adaptive algorithm, the eigenvalue spread of the covariance matrix of the input signal is reduced, thereby increasing the adaptation rate. Simulation results indicate that the convergence speed of the proposed beamformer is comparable to a time domain realisation, albeit at a much reduced cost.