Mixed microwave-digital and multi-rate approach for wideband beamforming applications using 2-D IIR beam filters and nested uniform linear arrays

The presented work explores novel methods for synthesizing approximately frequency independent array factors at lower hardware complexity for wideband beamforming applications. The proposed approach employs 2-D infinite impulse response (IIR) digital beam filters together with nested uniform linear...

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Bibliographic Details
Published in:Multidimensional systems and signal processing 2018-04, Vol.29 (2), p.703-718
Main Authors: Ariyarathna, Viduneth, Madanayake, Arjuna, Agathoklis, Panajotis, Bruton, Len T.
Format: Article
Language:English
Subjects:
Approximation
Artificial Intelligence
Beamforming
Broadband
Circuits and Systems
Electrical Engineering
Engineering
Hardware
Impulse response
Integrated circuits
Linear arrays
Microprocessors
Nesting
Power consumption
Signal processing
Signal,Image and Speech Processing
Very large scale integration
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Summary:The presented work explores novel methods for synthesizing approximately frequency independent array factors at lower hardware complexity for wideband beamforming applications. The proposed approach employs 2-D infinite impulse response (IIR) digital beam filters together with nested uniform linear arrays (ULAs). The array is designed to have multiple levels of nesting. Each level of nesting consists of a ULA covering a temporal subband of the incident wideband signal. The use of nested arrays provides the required aperture size using a smaller number of elements compared to using a single ULA to capture the entire wideband signal. The use of different levels of nesting allows the operation of the digital processor for each sub-band at different clock rates. This is a hierarchical approach that saves both digital VLSI hardware and power consumption. The 2-D IIR digital beam filters that process each subband signal from each of the nested subarray achieves wideband beamforming. Simulations illustrate approximately frequency independent passbands as required in wideband beamforming.
ISSN:0923-6082
1573-0824
DOI:10.1007/s11045-016-0422-3