Picture of person typing on laptop with programming code visible on the laptop screen

World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

Explore

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.

Full text not available in this repository. Request a copy from the Strathclyde author

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.