Abstract:
A 3-D FIR frustum filter having sparse coefficients
is proposed for enhancing broadband plane waves received by
uniform aperture arrays. Motivated by the design technique of
1-D interpolated FIR filters, the proposed filter is realized by
cascading a spatially-upsampled 3-D FIR prototype filter having
a frustum-shaped passband and a 3-D FIR masking filter having
a parallelepiped passband. Sparsity of the filter coefficients is
achieved through the spatial upsampling of the coefficients of the
prototype filter and by hard-thresholding the coefficients of both
prototype and masking filters. The proposed 3-D FIR frustum
filter saves 39:5% multiplications and 66:6% additions compared
to the state-of-the-art 3-D FIR frustum filters without degrading
the performance in enhancing broadband plane waves.
Citation:
Wijesekara, R., Edussooriya, C., Bruton, L. T., & Agathoklis, P. (2018). A 3-D Sparse FIR Frustum Filter for Enhancing Broadband Plane Waves. IEEE Transactions on Circuits and Systems II: Express Briefs, PP, 1–1. https://doi.org/10.1109/TCSII.2018.2856848