Low-Complexity Wideband Transmit Array using Variable-Precision 2-D Sparse FIR Digital Filters

A low-complexity wideband transmit beamformer is proposed using a digitally-fed uniform linear array of broadband Vivaldi antennas operating in the S-band. The proposed transmit beamformer employs a novel DSP feeding network based on a transmit-mode 2-D sparse finite-extent impulse response (FIR) fi...

Full description

Saved in:
Bibliographic Details
Main Authors: Edussooriya, C. U. S., Wijenayake, C., Pulipati, S., Madanayake, A., Bruton, L. T.
Format: Conference Proceeding
Language:English
Subjects:
antenna arrays
Array signal processing
Complexity theory
Finite impulse response filters
Frequency-domain analysis
low-complexity
MIMO
Passband
phased arrays
sparse FIR filters
Transmit beamforming
Vivaldi antennas
Wideband
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A low-complexity wideband transmit beamformer is proposed using a digitally-fed uniform linear array of broadband Vivaldi antennas operating in the S-band. The proposed transmit beamformer employs a novel DSP feeding network based on a transmit-mode 2-D sparse finite-extent impulse response (FIR) filter having a planar passband in the 2-D frequency-wavenumber space. Electronic beam steering is achieved by changing the filter coefficients defined in closed-form and hard-thresholding (HT) is employed to obtain a sparse 2-D impulse responses of the filter. Full-wave electromagnetic simulations are used to obtain the far-field beam patterns produced by the 2-D sparse FIR filter in the frequency range 2-2.8 GHz for wideband signals with 33% fractional bandwidth. Computational complexity, beam directionality and side-lobe performance are investigated with varying HT along with quantitative comparisons with an equally selective wideband frequency-domain phased array.
ISSN:2158-1525
DOI:10.1109/ISCAS.2019.8702602