2D space-time wave-digital multi-fan filter banks for signals consisting of multiple plane waves Article

Rajapaksha, N, Madanayake, A, Bruton, LT. (2014). 2D space-time wave-digital multi-fan filter banks for signals consisting of multiple plane waves . MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING, 25(1), 17-39. 10.1007/s11045-012-0183-6

cited authors

  • Rajapaksha, N; Madanayake, A; Bruton, LT

authors

abstract

  • Two dimensional space-time fan filters may be used for the highly-selective enhancement of spatio-temporal plane-waves on the basis of their directions of arrival. Unlike uniform bandwidth beam filters, ideal fan filters transmit passband signals over a range of directions of arrival that is independent of their 1D temporal spectrum. In this work, closed-form 2D wave-digital filter design equations and corresponding hardware architectures are proposed for realizing M independent fan-shaped passbands having independently steerable directionality and selectivity. A design method based on LCR ladder networks is proposed and implemented using a 2D time-multiplexed raster-scanned architecture that is suitable for low frequency applications such as audio, multimedia, seismic and ultrasonic beamforming. The architectures are designed, simulated, physically realized and tested on FPGA-based prototypes. Examples of 2D IIR M-fan filterbanks with FPGA implementations, together with measured results from on-chip hardware verifications, show the successful design and hardware realization. The filterbanks and hardware architectures are shown to be suitable for real-time sensor-array beamforming applications using custom VLSI circuits. © 2012 Springer Science+Business Media, LLC.

publication date

  • January 1, 2014

published in

Digital Object Identifier (DOI)

start page

  • 17

end page

  • 39

volume

  • 25

issue

  • 1