153 citations · 815 across the 39 of their papers we have counts for
39 papers
Agentic Physical-AI for Self-Aware RF Systems
Linuka Ratnayake, Danidu Dabare, Sanuja Rupasinghe +4
Intelligent control of RF transceivers adapting to dynamic operational conditions is essential in the modern and future communication systems. We propose a multi-agent neurosymboli…
A Light Weight Neural Network for Automatic Modulation Classification in OFDM Systems
Indiwara Nanayakkara, Dehan Jayawickrama, Dasuni Jayawardena +2
Automatic Modulation Classification (AMC) is a vital component in the development of intelligent and adaptive transceivers for future wireless communication systems. Existing stati…
General Framework for Array Noise Analysis and Noise Performance of a Two-Element Interferometer With a Mutual-Coupling Canceler
Leonid Belostotski, Adrian T. Sutinjo, Ravi Subrahmanyan +2
This article investigates the noise performance of a two-element phased array and interferometer containing a recently introduced self-interference canceler, which in the context o…
A Low-complexity Structured Neural Network Approach to Intelligently Realize Wideband Multi-beam Beamformers
Hansaka Aluvihare, Sivakumar Sivasankar, Xianqi Li +2
True-time-delay (TTD) beamformers can produce wideband, squint-free beams in both analog and digital signal domains, unlike frequency-dependent FFT beams. Our previous work showed…
Fast Data-independent KLT Approximations Based on Integer Functions
A. P. Radünz, D. F. G. Coelho, F. M. Bayer +2
The Karhunen-Loève transform (KLT) stands as a well-established discrete transform, demonstrating optimal characteristics in data decorrelation and dimensionality reduction. Its ab…
Revealing Invisible Scattering Poles via Complex Frequency Excitations
Deepanshu Trivedi, Arjuna Madanayake, Alex Krasnok
Recent research in light scattering has prompted a re-evaluation of complex quantities, particularly in the context of complex frequency signals, which exhibit exponential growth o…
Anomalies in Light Scattering: A Circuit Model Approach
Deepanshu Trivedi, Arjuna Madanayake, Alex Krasnok
In experimental physics, it is essential to understand electromagnetic (EM) wave scattering across EM spectrum, from radio waves to X-rays, and is pivotal in driving photonics inno…
Cellular Wireless Networks in the Upper Mid-Band
Seongjoon Kang, Marco Mezzavilla, Sundeep Rangan +6
The upper mid-band - roughly from 7 to 24 GHz - has attracted considerable recent interest for new cellular services. This frequency range has vastly more spectrum than the highly…
Fano-Qubits for Quantum Devices with Enhanced Isolation and Bandwidth
Deepanshu Trivedi, Leonid Belostotski, Arjuna Madanayake +1
Magneto-optical isolators and circulators have been widely used to safeguard quantum devices from reflections and noise in the readout stage. However, these devices have limited ba…
Vision Transformer with Convolutional Encoder-Decoder for Hand Gesture Recognition using 24 GHz Doppler Radar
Kavinda Kehelella, Gayangana Leelarathne, Dhanuka Marasinghe +5
Transformers combined with convolutional encoders have been recently used for hand gesture recognition (HGR) using micro-Doppler signatures. We propose a vision-transformer-based a…
Low-Complexity Loeffler DCT Approximations for Image and Video Coding
D. F. G. Coelho, R. J. Cintra, F. M. Bayer +6
This paper introduced a matrix parametrization method based on the Loeffler discrete cosine transform (DCT) algorithm. As a result, a new class of eight-point DCT approximations wa…
Fast Radix-32 Approximate DFTs for 1024-Beam Digital RF Beamforming
A. Madanayake, R. J. Cintra, N. Akram +6
The discrete Fourier transform (DFT) is widely employed for multi-beam digital beamforming. The DFT can be efficiently implemented through the use of fast Fourier transform (FFT) a…
Towards a Low-SWaP 1024-beam Digital Array: A 32-beam Sub-system at 5.8 GHz
Arjuna Madanayake, Viduneth Ariyarathna, Suresh Madishetty +8
Millimeter wave communications require multibeam beamforming in order to utilize wireless channels that suffer from obstructions, path loss, and multi-path effects. Digital multibe…
Block-Parallel Systolic-Array Architecture for 2-D NTT-based Fragile Watermark Embedding
H. P. L. Arjuna Madanayake, R. J. Cintra, V. S. Dimitrov +1
Number-theoretic transforms (NTTs) have been applied in the fragile watermarking of digital images. A block-parallel systolic-array architecture is proposed for watermarking based…
Radix-2 Self-Recursive Sparse Factorizations of Delay Vandermonde Matrices for Wideband Multi-Beam Antenna Arrays
S. M. Perera, A. Madanayake, R. J. Cintra
This paper presents a self-contained factorization for the Vandermonde matrices associated with true-time delay based wideband analog multi-beam beamforming using antenna arrays. T…
Efficient and Self-Recursive Delay Vandermonde Algorithm for Multi-Beam Antenna Arrays
S. M. Perera, A. Madanayake, R. J. Cintra
This paper presents a self-contained factorization for the delay Vandermonde matrix (DVM), which is the super class of the discrete Fourier transform, using sparse and companion ma…
Orbital Angular Momentum (OAM) Carrying Vortex Wave generation in Dielectric Filled Circular Waveguide
Md Khadimul Islam, Arjuna Madanayake, Shubhendu Bhardwaj
In this paper, we propose a method to generate Orbital Angular Momentum (OAM) carrying vortex waves inside a metallic circular waveguide (CW). These waves feature ability to carry…
Design of Maximum-Gain Dielectric Lens Antenna via Phase Center Analysis
Md Khadimul Islam, Arjuna Madanayake, Shubhendu Bhardwaj
In this work, a method is presented to maximize the obtained gain from millimeter-wave (mm-wave) lens antennas using phase center analysis. Commonly, for designing a lens antenna,…
Low-complexity Scaling Methods for DCT-II Approximations
D. F. G. Coelho, R. J. Cintra, A. Madanayake +1
This paper introduces a collection of scaling methods for generating -point DCT-II approximations based on -point low-complexity transformations. Such scaling is based on th…
Millimeter-Wave Antenna Array Diagnosis with Partial Channel State Information
George Medina, Akashdeep Singh Jida, Sravan Pulipati +5
Large antenna arrays enable directional precoding for Millimeter-Wave (mmWave) systems and provide sufficient link budget to combat the high path-loss at these frequencies. Due to…
A Passive STAR Microwave Circuit for 1-3 GHz Self-Interference Cancellation
Udara De Silva, Sravan Pulipati, Satheesh Bojja Venkatakrishnan +2
Simultaneous transmit and receive (STAR) allows full-duplex operation of a radio, which leads to doubled capacity for a given bandwidth. A circulator with high-isolation between tr…
Xilinx RF-SoC-based Digital Multi-Beam Array Processors for 28/60~GHz Wireless Testbeds
Sravan Pulipati, Viduneth Ariyarathna, Aditya Dhananjay +6
Emerging wireless applications such as 5G cellular, large intelligent surfaces (LIS), and holographic massive MIMO require antenna array processing at mm-wave frequencies with larg…
A Direct- Conversion Digital Beamforming Array Receiver with 800 MHz Channel Bandwidth at 28 GHz using Xilinx RF SoC
Sravan Pulipati, Viduneth Ariyarathna, Udara De Silva +5
This paper discusses early results associated with a fully-digital direct-conversion array receiver at 28~GHz. The proposed receiver makes use of commercial off-the-shelf (COTS) el…
Low-complexity 8-point DCT Approximation Based on Angle Similarity for Image and Video Coding
R. S. Oliveira, R. J. Cintra, F. M. Bayer +3
The principal component analysis (PCA) is widely used for data decorrelation and dimensionality reduction. However, the use of PCA may be impractical in real-time applications, or…