17 citations · 19 across the 10 of their papers we have counts for
11 papers
Low-Complexity Tensor-Based Channel Parameter Estimation for mmWave MIMO-Assisted Systems
Francisco I. T. Pires, Jean C. S. Ferreira, Fazal-E Asim
This paper presents a low-complexity tensor-based channel estimation framework for downlink mmWave massive MIMO systems using passive Butler-matrix beamforming. By modeling receive…
PARAFAC-Based Low-Latency Angular Tracking for RIS-Assisted Sensing
Kenneth Benício, André L. F. de Almeida, Bruno Sokal +3
This paper proposes adaptive tensor tracking for angular trajectories (ATTRACT), a structure-aware alternating least squares algorithm for low-latency target tracking in reconfigur…
Structured Channel Parameter Estimation for RIS-Assisted MIMO Systems via Kronecker and Tensor Factorizations
Melryllin G. O. Sousa, Jean C. S. Ferreira, Fazal-E Asim
This paper proposes structured channel-parameter estimators for reconfigurable intelligent surface (RIS)-assisted multiple-input multiple-output (MIMO) systems employing uniform re…
Low-Complexity Channel Parameter Estimation for Coprime HRIS-Assisted MIMO Systems
Jean C. S. Ferreira, Melryllin G. O. Sousa, Fazal-E Asim
This paper proposes a parameter estimation scheme for uplink MIMO systems assisted by a Hybrid Reconfigurable Intelligent Surface (HRIS). To reduce hardware complexity, the HRIS em…
Deconstructing the Composite Channel for Beyond Diagonal RIS: Channel Estimation and Beamforming Design
Fazal-E Asim, André L. F. de Almeida, Bruno Sokal +2
As beyond-diagonal reconfigurable intelligent surfaces (BD-RISs) gain increasing attention in high-frequency wireless communications, accurate and scalable channel-estimation metho…
Low-Complexity Tensor-Based Monostatic Sensing for IRS-Assisted Communication Systems
Kenneth B. A. Benício, Bruno Sokal, André L. F. de Almeida +3
This paper proposes a tensor-based parameter estimation algorithm for sensing in an intelligent reflecting surface-assisted system. We present a higher-order singular value decompo…
Decoupled Azimuth Elevation AoA Estimation Exploiting Kronecker Separable Steering Matrices
Faizan A. Khattak, Ian K. Proudler, Stephan Weiss +1
Uniform rectangular arrays (URA), structured non-uniform rectangular arrays (NURA), and parallelogram shaped (UPgA and NUPgA) arrays admit steering vectors that can be expressed as…
Multi-Target Estimation via Tensor Decomposition for Beyond Diagonal RIS-Aided Bistatic Sensing
Kenneth Benício, André L. F. de Almeida, Fazal-E Asim +4
We investigate the performance of beyond-diagonal reconfigurable intelligent surfaces (BD-RIS) for bistatic MIMO multi-target sensing using a two-stage tensor Doppler-delay-angle e…
Channel Estimation for Downlink Communications Based on Dynamic Metasurface Antennas
Amarilton L. Magalhães, Fazal E-Asim, André L. F. de Almeida +1
Dynamic metasurface antennas (DMAs) are emerging as a promising technology to enable energy-efficient, large array-based multi-antenna systems. This paper presents a simple channel…
Least-Squares Khatri-Rao Factorization of a Polynomial Matrix
Faizan A. Khattak, Fazal-E-Asim, Stephan Weiss +1
The Khatri-Rao product is extensively used in array processing, tensor decomposition, and multi-way data analysis. Many applications require a least-squares (LS) Khatri-Rao factori…
Channel Parameter Estimation for Millimeter-Wave Cellular Systems with Hybrid Beamforming
Fazal-E-Asim, Felix Antreich, Charles C. Cavalcante +2
To achieve high data rates defined in 5G, the use of millimeter-waves and massive-MIMO are indispensable. To benefit from these technologies, an accurate estimation of the channel…