4 citations · 12 across the 27 of their papers we have counts for
29 papers
Analysis of Non-Separable Scattering in WDM-Based NLoS Holographic MIMO
Ashutosh Prajapati, Prathapasinghe Dharmawansa, Italo Atzeni
Although scattering is inherently non-separable, holographic multiple-input multiple-output channels are commonly modeled using separable scattering across the source and receiver.…
Robust Near-Field Beam Focusing Under Imperfect Localization
Nima Mozaffarikhosravi, Amirhossein Azarbahram, Prathapasinghe Dharmawansa +1
The transition to 6G-and-beyond wireless systems with large-scale antenna arrays and high-frequency deployments significantly extends the near-field region, where channels exhibit…
The Effect of Noise Correlation on MMSE Channel Estimation in One-Bit Quantized Systems
Minhua Ding, Prathapasinghe Dharmawansa, Italo Atzeni +1
This paper analyzes the impact of spatially correlated additive noise on the minimum mean-square error (MMSE) estimation of multiple-input multiple-output (MIMO) channels from one-…
LoS+NLoS Holographic MIMO: Analysis and Application of Wavenumber-Division Multiplexing
Ashutosh Prajapati, Prathapasinghe Dharmawansa, Marco Di Renzo +1
Holographic multiple-input multiple-output (MIMO) enables electrically large continuous apertures, overcoming the physical scaling limits of conventional MIMO architectures with ha…
Wavenumber-Division Multiplexing in Holographic MIMO with NLoS Channels
Ashutosh Prajapati, Prathapasinghe Dharmawansa, Marco Di Renzo +1
Wavenumber-division multiplexing (WDM) was introduced as a counterpart of orthogonal frequency-division multiplexing in the spatial-frequency domain for line-of-sight holographic m…
Performance Analysis for Multi-User Holographic MIMO Downlink with Matched Filter Precoding
Gayathri Shekar, Saman Atapattu, Prathapasinghe Dharmawansa +1
Holographic MIMO (HMIMO) has emerged as a promising solution for future wireless systems by enabling ultra-dense, spatially continuous antenna deployments. While prior studies have…
Eigenvalue-Based Detection in MIMO Systems for Integrated Sensing and Communication
Alex Obando, Saman Atapattu, Prathapasinghe Dharmawansa +2
This paper considers a MIMO Integrated Sensing and Communication (ISAC) system, where a base station simultaneously serves a MIMO communication user and a remote MIMO sensing recei…
Localization-Based Beam Focusing in Near-Field Communications
Nima Mozaffarikhosravi, Prathapasinghe Dharmawansa, Italo Atzeni
Shifting 6G-and-beyond wireless systems to higher frequency bands and the utilization of massive multiple-input multiple-output arrays will extend the near-field region, affecting…
Max-Min Fairness for Stacked Intelligent Metasurface-Assisted Multi-User MISO Systems
Nipuni Ginige, Prathapasinghe Dharmawansa, Arthur Sousa de Sena +3
Stacked intelligent metasurface (SIM) is an emerging technology that uses multiple reconfigurable surface layers to enable flexible wave-based beamforming. In this paper, we focus…
Uniform Planar Array Based Weighted Cooperative Spectrum Sensing for Cognitive Radio Networks
Charith Dissanayake, Saman Atapattu, Prathapasinghe Dharmawansa +3
Cooperative spectrum sensing (CSS) is essential for improving the spectrum efficiency and reliability of cognitive radio applications. Next-generation wireless communication networ…
Detection of Signals in Colored Noise: Roy's Largest Root Test for Non-central -matrices
Prathapasinghe Dharmawansa, Saman Atapattu, Jamie Evans +1
This paper investigates the signal detection problem in colored noise with an unknown covariance matrix. In particular, we focus on detecting a non-random signal by capitalizing on…
Detection of Signals in Colored Noise: Leading Eigenvalue Test for Non-central -matrices
Prathapasinghe Dharmawansa, Saman Atapattu, Jamie Evans +1
This paper investigates the signal detection problem in colored noise with an unknown covariance matrix. In particular, we focus on detecting an unknown non-random signal by capita…
A Sample-Deficient Analysis of the Leading Generalized Eigenvalue for the Detection of Signals in Colored Gaussian Noise
Prathapasinghe Dharmawansa, Saman Atapattu, Jamie Evans +1
This paper investigates the signal detection problem in colored Gaussian noise with an unknown covariance matrix. To be specific, we consider a sample deficient scenario in which t…
Flex-Net: A Graph Neural Network Approach to Resource Management in Flexible Duplex Networks
Tharaka Perera, Saman Atapattu, Yuting Fang +2
Flexible duplex networks allow users to dynamically employ uplink and downlink channels without static time scheduling, thereby utilizing the network resources efficiently. This wo…
On the Convergence of Inexact Gradient Descent with Controlled Synchronization Steps
Sandushan Ranaweera, Chathuranga Weeraddana, Prathapasinghe Dharmawansa +1
We develop a gradient-like algorithm to minimize a sum of peer objective functions based on coordination through a peer interconnection network. The coordination admits two stages:…
The Eigenvectors of Single-spiked Complex Wishart Matrices: Finite and Asymptotic Analyses
Prathapasinghe Dharmawansa, Pasan Dissanayake, Yang Chen
Let be a {\it single-spiked} Wishart matrix in the class with…
Distribution of the Scaled Condition Number of Single-spiked Complex Wishart Matrices
Pasan Dissanayake, Prathapasinghe Dharmawansa, Yang Chen
Let () be a random matrix with independent columns each distributed as complex multivariate Gaussian with zero mean and {\it single-s…
Performance Analysis of a Two-Tile Reconfigurable Intelligent Surface Assisted MIMO System
Prathapasinghe Dharmawansa, Saman Atapattu, Marco Di Renzo
We consider a two--tile reconfigurable intelligent surface (RIS) assisted wireless network with a two-antenna transmitter and receiver over Rayleigh fading. We show that the averag…
Reconfigurable Intelligent Surface assisted Two-Way Communications: Performance Analysis and Optimization
Saman Atapattu, Rongfei Fan, Prathapasinghe Dharmawansa +3
In this paper, we investigate the two-way communication between two users assisted by a re-configurable intelligent surface (RIS). The scheme that two users communicate simultaneou…
Eigenvalue Based Detection of a Signal in Colored Noise: Finite and Asymptotic Analyses
Lahiru D. Chamain, Prathapasinghe Dharmawansa, Saman Atapattu +1
Signal detection in colored noise with an unknown covariance matrix has a myriad of applications in diverse scientific/engineering fields. The test statistic is the largest general…
Detection of a Signal in Colored Noise: A Random Matrix Theory Based Analysis
Lahiru D. Chamain, Prathapasinghe Dharmawansa, Saman Atapattu +1
This paper investigates the classical statistical signal processing problem of detecting a signal in the presence of colored noise with an unknown covariance matrix. In particular,…
Outage Analysis of MIMO-MRC in Correlated Rician Fading
Prathapasinghe Dharmawansa, Kumara Kahatapitiya, Saman Atapattu +1
This paper addresses one of the classical problems in random matrix theory-- finding the distribution of the maximum eigenvalue of the correlated Wishart unitary ensemble. In parti…
Traffic Minimizing Caching and Latent Variable Distributions of Order Statistics
Joonas Pääkkönen, Prathapasinghe Dharmawansa, Ragnar Freij-Hollanti +2
Given a statistical model for the request frequencies and sizes of data objects in a caching system, we derive the probability density of the size of the file that accounts for the…
Roy's largest root under rank-one alternatives:The complex valued case and applications
Prathapasinghe Dharmawansa, Boaz Nadler, Ofer Shwartz
The largest eigenvalue of a Wishart matrix, known as Roy's largest root (RLR), plays an important role in a variety of applications. Most works to date derived approximations to it…