Results 91 to 100 of about 2,316 (239)

A Risk-Aware Robust Navigation Framework for UAVs in GNSS-Degraded Low-Altitude Environments

Drones
To address the critical issues of geometric ill-conditioning and non-line-of-sight (NLOS) interference faced by broadcast radio positioning systems in long-distance transmission (≥200 km) and low-altitude flight scenarios (1000 m to 3000 m), this paper ...
Yuan Ma, Guifen Chen, Yijun Wang, Dakun Liu   +3 more
doaj   +1 more source

Directive Antenna Clutter Loss in Slant Paths

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper investigates the development of a clutter loss model specifically for slant paths involving directive antennas. Conventionally, clutter loss is characterized by using isotropic antennas to facilitate standard link budget calculations via single antenna gain values.
Fernando Pérez Fontán, Vicente Pastoriza‐Santos, Fernando Machado Domı́nguez, Thomas Prechtl, Pavel Pechac   +4 more
wiley   +1 more source

CLEAR Interference Cancellation in a Wideband Dual‐Channel Receiver for Independent Satellite Multi‐Connectivity Links

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT In this paper, the correlation learning estimation and adaptive reduction (CLEAR) of interference, an adaptive, blind and transparent interference compensation method applied in a wideband dual‐channel receiver, is studied for a pair of independent satellite multi‐connectivity links, using the same carrier frequency and signal bandwidth in use
Svilen Dimitrov
wiley   +1 more source

Integrating Image Segmentation and Deep Learning to Improve Radio Frequency Propagation Models

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper proposes a multi‐sensor approach to improve radio frequency (RF) propagation models, which play a key role in the rapidly expanding field of connected vehicle technology. Focusing on the 1‐ to 20‐GHz frequency range, which is critical for both satellite‐to‐vehicle and base station‐to‐vehicle communications, our study introduces a ...
Jonathan Israel, Xavier Boulanger, Vegard Arneson   +2 more
wiley   +1 more source

Task Duration-Constrained Joint Resource Allocation and Trajectory Design for UAV-Assisted Backscatter Communication System

Applied Sciences
Backscatter communication (BackCom) has emerged as an energy-efficient and low-cost communication paradigm, in which wireless devices transmit information by reflecting incident signals rather than actively generating radio frequency signals.
Wenxin Zhou, Long Suo
doaj   +1 more source

Geometric Characterization of LEO–GEO Inter‐Satellite Links for Bidirectional Communications

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Incorporating geosynchronous Earth orbit (GEO) and low Earth orbit (LEO) satellites can extend communication services far beyond the reach of terrestrial infrastructure. A key enabler of such architectures is the establishment of inter‐satellite links (ISLs) between LEOs and GEOs to support bidirectional communications.
Muhammad Furqan, Lingfeng Ye, Yanming Feng   +2 more
wiley   +1 more source

Visionary, engineer, and experimenter: Three forms of entrepreneurship in the quest for product–market fit

Strategic Entrepreneurship Journal, EarlyView.
Abstract Research summary Entrepreneurship unfolds under uncertainty, which complicates entrepreneurs' efforts to align idea, action, and environment to reach product–market fit. To illuminate how entrepreneurs perform such alignment, we complement the theory‐based view and its focus on cognitive uncertainty with a discussion of behavioral uncertainty.
Thomas Zellweger, Djordje Djokovic
wiley   +1 more source

Strategy for One‐Step Optimization of Metal Oxide Passivating Contact Materials for Si Heterojunction Solar Cells through Growth Angle Variation

Small, EarlyView.
A one‐step oblique angle reactive sputtering approach enables simultaneous tuning of bulk and interfacial stoichiometry in a metal oxide/ silicon heterojunction. In case of vanadium oxides, growth angle variation controls the formation of stoichiometric SiO2, ternary SiOx(V) interlayer, and phase purity of vanadium oxide, considerably simplifying the ...
Aparajita Mandal, Alexis Franquet, Hans Hofsäss, Tapobrata Som   +3 more
wiley   +1 more source

Decentralized Aggregation for Energy-Efficient Federated Learning in mmWave Aerial-Terrestrial Integrated Networks

IEEE Transactions on Machine Learning in Communications and Networking
It is anticipated that aerial-terrestrial integrated networks incorporating unmanned aerial vehicles (UAVs) mounted relays will offer improved coverage and connectivity in the beyond 5G era.
Mohammed Saif, Md. Zoheb Hassan, Md. Jahangir Hossain   +2 more
doaj   +1 more source

Minimal Input, Maximum Insight: Inferring Material Parameters From Solar Cell JV Curves Alone

Small Methods, EarlyView.
A machine‐learning framework is presented for extracting key material parameters directly from standard current‐voltage measurements of organic solar cells. By combining physics‐based simulations with a differential learning approach and residual neural networks, the method infers quantities such as mobility and recombination lifetime as probability ...
Cai Williams, Chen Wang, Alexander Ehm, Dietrich R. T. Zahn, Maria Saladina, Carsten Deibel, Roderick C. I. Mackenzie   +6 more
wiley   +1 more source