Dr. Arjuna Madanayake Profile

Dr. Arjuna Madanayake

at Florida International Univ

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Publications (6)

Proceedings Article | 19 June 2014 Paper

Low-complexity multiplierless DCT approximations for low-power HEVC digital IP cores

Sunera Kulasekera, Arjuna Madanayake, Renato Cintra, Fabio Bayer, Uma Potluri

Proceedings Volume 9089, 90890W (2014) https://doi.org/10.1117/12.2050715

KEYWORDS: Field programmable gate arrays, Image compression, Video compression, Video, Video coding, Multimedia, Digital imaging, Video processing, Imaging systems, Computer programming

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Proceedings Article | 29 May 2014 Paper

Wideband aperture array using RF channelizers and massively parallel digital 2D IIR filterbank

Arindam Sengupta, Arjuna Madanayake, Roberto Gómez-García, Erik Engeberg

Proceedings Volume 9077, 90771G (2014) https://doi.org/10.1117/12.2053050

KEYWORDS: Digital filtering, Optical filters, Filtering (signal processing), Electronic filtering, Antennas, Fluctuations and noise, Clocks, Phased arrays, Finite impulse response filters, Digital signal processing

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Wideband receive-mode beamforming applications in wireless location, electronically-scanned antennas for radar, RF sensing, microwave imaging and wireless communications require digital aperture arrays that offer a relatively constant far-field beam over several octaves of bandwidth. Several beamforming schemes including the well-known true time-delay and the phased array beamformers have been realized using either finite impulse response (FIR) or fast Fourier transform (FFT) digital filter-sum based techniques. These beamforming algorithms offer the desired selectivity at the cost of a high computational complexity and frequency-dependant far-field array patterns. A novel approach to receiver beamforming is the use of massively parallel 2-D infinite impulse response (IIR) fan filterbanks for the synthesis of relatively frequency independent RF beams at an order of magnitude lower multiplier complexity compared to FFT or FIR filter based conventional algorithms. The 2-D IIR filterbanks demand fast digital processing that can support several octaves of RF bandwidth, fast analog-to-digital converters (ADCs) for RF-to-bits type direct conversion of wideband antenna element signals. Fast digital implementation platforms that can realize high-precision recursive filter structures necessary for real-time beamforming, at RF radio bandwidths, are also desired. We propose a novel technique that combines a passive RF channelizer, multichannel ADC technology, and single-phase massively parallel 2-D IIR digital fan filterbanks, realized at low complexity using FPGA and/or ASIC technology. There exists native support for a larger bandwidth than the maximum clock frequency of the digital implementation technology. We also strive to achieve More-than-Moore throughput by processing a wideband RF signal having content with N-fold (B = N F_clk/2) bandwidth compared to the maximum clock frequency F_clk Hz of the digital VLSI platform under consideration. Such increase in bandwidth is achieved without use of polyphase signal processing or time-interleaved ADC methods. That is, all digital processors operate at the same F_clk clock frequency without phasing, while wideband operation is achieved by sub-sampling of narrower sub-bands at the the RF channelizer outputs.

Proceedings Article | 29 May 2014 Paper

FPGA architectures for electronically scanned wide-band RF beams using 3-D FIR/IIR digital filters for rectangular array aperture receivers

Sewwandi Wijayaratna, Arjuna Madanayake, Brandon Beall, Len Bruton

Proceedings Volume 9077, 907702 (2014) https://doi.org/10.1117/12.2050664

KEYWORDS: Antennas, Field programmable gate arrays, Filtering (signal processing), Electronic filtering, Digital filtering, Optical filters, Receivers, Infinite impulse response filters, MATLAB, Prototyping

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Proceedings Article | 21 May 2014 Paper

Direction/location estimation and modulation detection for RF sources using steerable 3D IIR digital beam filters

Nilan Udayanga, Arjuna Madanayake, Chamith Wijenayake

Proceedings Volume 9103, 91030F (2014) https://doi.org/10.1117/12.2050800

KEYWORDS: Modulation, Antennas, Signal detection, Signal processing, Environmental sensing, Digital filtering, Correlation function, Feature extraction, Receivers, Chromium

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Proceedings Article | 31 May 2013 Paper

Rejection of interference and near-field coupled LNA-noise on FPA-fed multibeam dish antennas using 3D analog filters

Arjuna Madanayake, Chamith Wijenayake, Thushara Gunarathne, Leo Belostotski, Yongsheng Xu, Len Bruton

Proceedings Volume 8714, 871412 (2013) https://doi.org/10.1117/12.2016093

KEYWORDS: Staring arrays, Interference (communication), Antennas, Beam shaping, Optical filters, Analog electronics, Analog filtering, Receivers, 3D modeling, Filtering (signal processing)

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Proceedings Article | 28 May 2013 Paper

Low-complexity algorithms for spatio-temporal directional spectrum sensing with applications in cognitive radio

Arjuna Madanayake, Chamith Wijenayake, Uma Potluri, Judith Abeysekara, Dale Mugler

Proceedings Volume 8753, 87530G (2013) https://doi.org/10.1117/12.2016107

KEYWORDS: Detection and tracking algorithms, Antennas, Beam shaping, Chromium, Array processing, Sensing systems, Signal processing, Phased arrays, Prototyping, Signal detection

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Showing 5 of 6 publications

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