8 citations · 11 across the 14 of their papers we have counts for
16 papers
On Models with Power Conservation in Reflective Intelligent Surfaces and their Design Implications
Robin J. Williams, Pablo Ramirez-Espinosa, Olena Semenovska +1
Reconfigurable intelligent surfaces (RISs) are potential enablers of future wireless communications and sensing applications and use-cases. The RIS is envisioned as a dynamically c…
Prediction of Rare Channel Conditions using Bayesian Statistics and Extreme Value Theory
Tobias Kallehauge, Anders E. Kalør, Pablo Ramírez-Espinosa +2
Estimating the probability of rare channel conditions is a central challenge in ultra-reliable wireless communication, where random events, such as deep fades, can cause sudden var…
A Tutorial on Fluid Antenna System for 6G Networks: Encompassing Communication Theory, Optimization Methods and Hardware Designs
Wee Kiat New, Kai-Kit Wong, Hao Xu +9
The advent of the sixth-generation (6G) networks presents another round of revolution for the mobile communication landscape, promising an immersive experience, robust reliability,…
A New Spatial Block-Correlation Model for Fluid Antenna Systems
Pablo Ramirez-Espinosa, David Morales-Jimenez, Kai-Kit Wong
Powered by position-flexible antennas, the emerging fluid antenna system (FAS) technology is postulated as a key enabler for massive connectivity in 6G networks. The free movement…
On the Statistical Relation of Ultra-Reliable Wireless and Location Estimation
Tobias Kallehauge, Martin Voigt Vejling, Pablo Ramìrez-Espinosa +3
Location information is often used as a proxy to guarantee the performance of a wireless communication link. However, localization errors can result in a significant mismatch with…
Electromagnetic Based Communication Model for Dynamic Metasurface Antennas
Robin Jess Williams, Pablo Ramirez-Espinosa, Jide Yuan +1
Dynamic metasurface antennas (DMAs) arise as a promising technology in the field of massive multiple-input multiple-output (mMIMO) systems, offering the possibility of integrating…
Delivering Ultra-Reliable Low-Latency Communications via Statistical Radio Maps
Tobias Kallehauge, Anders E. Kalør, Pablo Ramírez-Espinosa +2
High reliability guarantees for Ultra-Reliable Low-Latency Communications (URLLC) require accurate knowledge of channel statistics, used as an input for rate selection. Exploiting…
Performance Evaluation of Dynamic Metasurface Antennas: Impact of Insertion Losses and Coupling
Pablo Ramírez-Espinosa, Robin Jess Williams, Jide Yuan +1
This paper evaluates the performance of multi-user massive multiple-input multiple-output (MIMO) systems in which the base station is equipped with a dynamic metasurface antenna (D…
Predictive Rate Selection for Ultra-Reliable Communication using Statistical Radio Maps
Tobias Kallehauge, Pablo Ramìrez-Espinosa, Anders E. Kalør +2
This paper proposes exploiting the spatial correlation of wireless channel statistics beyond the conventional received signal strength maps by constructing statistical radio maps t…
Statistics of the Effective Massive MIMO Channel in Correlated Rician Fading
Jens Abraham, Pablo Ramirez-Espinosa, Torbjörn Ekman
Massive MIMO base stations use multiple spatial diversity branches, which are often assumed to be uncorrelated in theoretical work. Correlated branches are considered seldom since…
Radio Sensing with Large Intelligent Surface for 6G
Cristian J. Vaca-Rubio, Pablo Ramirez-Espinosa, Kimmo Kansanen +2
This paper leverages the potential of Large Intelligent Surface (LIS) for radio sensing in 6G wireless networks. Major research has been undergone about its communication capabilit…
A Primer on the Statistical Relation between Wireless Ultra-Reliability and Location Estimation
Tobias Kallehauge, Pablo Ramírez-Espinosa, Kimmo Kansanen +2
Location information is often used as a proxy to infer the performance of a wireless communication link. Using a very simple model, this letter unveils a basic statistical relation…
Multiuser MIMO with Large Intelligent Surfaces: Communication Model and Transmit Design
Robin Jess Williams, Pablo Ramírez-Espinosa, Elisabeth de Carvalho +1
This paper proposes a communication model for multiuser multiple-input multiple-output (MIMO) systems based on large intelligent surfaces (LIS), where the LIS is modeled as a colle…
Assessing Wireless Sensing Potential with Large Intelligent Surfaces
Cristian J. Vaca-Rubio, Pablo Ramirez-Espinosa, Kimmo Kansanen +3
Sensing capability is one of the most highlighted new feature of future 6G wireless networks. This paper addresses the sensing potential of Large Intelligent Surfaces (LIS) in an e…
A Primer on Large Intelligent Surface (LIS) for Wireless Sensing in an Industrial Setting
Cristian J. Vaca-Rubio, Pablo Ramirez-Espinosa, Robin Jess Williams +4
One of the beyond-5G developments that is often highlighted is the integration of wireless communication and radio sensing. This paper addresses the potential of communication-sens…
A New Approach to the Statistical Analysis of Non-Central Complex Gaussian Quadratic Forms with Applications
Pablo Ramírez-Espinosa, Laureano Moreno-Pozas, José F. Paris +2
This paper proposes a novel approach to the statistical characterization of non-central complex Gaussian quadratic forms (CGQFs). Its key strategy is the generation of an auxiliary…