15 papers
Resource Slicing for Time-Sensitive Data Traffic in Non-Terrestrial Networks with FSO ISLs
Abid Afridi, Alexis A. Dowhuszko, Risto Wichman +1
In multi-hop Low Earth Orbit (LEO) satellite networks, time-sensitive packets experience queueing across multiple satellite hops, causing per-hop waiting times that accumulate and…
Spatial and Temporal Correlation of Interference in a Narrow Multibeam LEO Satellite Random Access Network
Ilari Angervuori, Abid Afridi, Risto Wichman
Interference is a limiting factor in the emerging dense low Earth orbit (LEO) networks. In the LEO network, the interference is spatially and temporally correlated. At narrow-beam…
Stochastic Analysis of Successive Interference Cancellation in a Narrow-Beam LEO Uplink
Ilari Angervuori, Risto Wichman
This paper investigates uplink coverage probability, i.e., the SIR distribution, and SIR order statistics at a low Earth orbit satellite base station (LEO BS) with narrow Gaussian…
Risk-Aware AoII-Based Scheduling with Hybrid Transmission for a Semi-Markov Source
Saeid Sadeghi Vilni, Risto Wichman
We consider a multi-receiver status update system in which a transmitter monitors a finite-state semi-Markov source and decides whether to stay idle, unicast an update, or broadcas…
Load Balancing in Non-Terrestrial Networks Using Free Space Optical Inter-satellite Links
Abid Afridi, Alexis A. Dowhuszko, Jevgenij Krivochiza +2
Non-terrestrial networks (NTNs) increasingly rely on non-geostationary (NGSO) constellations that combine radio frequency (RF) feeder links (FLs) with free space optical (FSO) inte…
Symbol Rate Maximization in Rolling-Shutter OCC: Design and Implementation Considerations
Xinyu Zhang, Alexis A. Dowhuszko, Miguel Rêgo +4
Optical Camera Communication (OCC) systems can take advantage of the row-by-row scanning process of rolling-shutter cameras to capture the fast variations of light intensity coming…
Guaranteeing Line-of-Sight Wireless Connectivity in Stochastic Environments with Random Obstacles
Mohsen Abedi, Alexis A. Dowhuszko, Mehdi Sookhak +1
Advancements in high-frequency communication technologies using millimeter waves (mmWave), Tera- Hertz (THz), and optical wireless frequency bands are key for extending wireless co…
Statistical Modeling for Accurate Characterization of Doppler Effect in LEO-Terrestrial Networks
Islam M. Tanash, Risto Wichman, Nuria Gonzalez-Prelcic
Low Earth Orbit (LEO) satellite communication is a promising solution for global wireless coverage, especially in underserved and remote areas. However, the high relative velocity…
On the Average Secrecy Performance of Satellite Networks in Short Packet Communication Systems
Ramin Hashemi, Graciela Corral Briones, Risto Wichman
This paper investigates the secrecy performance of satellite networks in short packet communication systems under shadowed Rician fading (SRF). We derive a lower bound on the avera…
Real-time Tracking System with Partially Coupled Sources
Saeid Sadeghi Vilni, Risto Wichman
We consider a pull-based real-time tracking system consisting of multiple partially coupled sources and a sink. The sink monitors the sources in real-time and can request one sourc…
3D Reconfigurable Intelligent Surfaces for Satellite-Terrestrial Networks
Islam M. Tanash, Risto Wichman
This paper proposes a three-dimensional (3D) satellite-terrestrial communication network assisted with reconfigurable intelligent surfaces (RISs). Using stochastic geometry models,…
On array geometry and self-interference in full-duplex massive MIMO communications
Robin Rajamäki, Risto Wichman
This paper studies the role of the joint transmit-receive antenna array geometry in shaping the self-interference (SI) channel in full-duplex communications. We consider a simple s…
Indoor Planning of Optical Wireless Networks for LoS Condition in Access and Backhauling
Mohsen Abedi, Alexis A. Dowhuszko, Risto Wichman
Optical wireless technology has the potential to complement the wireless access services provided so far over RF. Apart from the abundant unlicensed bandwidth available for ultra-d…
Deployment of Reference Nodes to Guarantee a LoS Condition for Accurate Indoor Positioning
Mohsen Abedi, Alexis A. Dowhuszko, Risto Wichman
Accurate and precise positioning is required to guarantee the massive adoption of a wide range of 5G indoor applications, such as logistics and smart manufacturing. Native support…
Index Modulation-based Information Harvesting for Far-Field RF Power Transfer
M. Ertug Pihtili, Mehmet C. Ilter, Ertugrul Basar +2
While wireless information transmission (WIT) is evolving into its sixth generation (6G), maintaining terminal operations that rely on limited battery capacities has become one of…