Πλοήγηση ανά Θέμα "Antennas"
Αποτελέσματα 1-20 από 28
-
5G-XHaul: A Novel Wireless-Optical SDN Transport Network to Support Joint 5G Backhaul and Fronthaul Services
(2019)The increased carrier bandwidth and the number of antenna elements expected in 5G networks require a redesign of the traditional IP-based backhaul and CPRI-based fronthaul interfaces used in 4G networks. We envision future ... -
An assessment of a unmanned aerial vehicle-based broadcast scenario assuming random terrestrial user locations
(2021)With the advent of the new decade, unmanned aerial vehicles (UAVs) will increasingly play an active role mainly as broadband transmission relays for broadcast applications. In the present study, we consider a feasible ... -
CDMA RoFSO Links with Nonzero Boresight Pointing Errors over M Turbulence Channels
(2018)Radio-on-Free-Space Optical systems constitute a very attractive option for interconnecting central base stations with remote antenna units. Nonetheless, the optical signal propagation through the atmosphere is tremendously ... -
Chemical composition and bioactive properties of: Sanguisorba minor Scop. under Mediterranean growing conditions
(2019)Sanguisorba minor Scop. is a perennial plant native to the Mediterranean region which exhibits several medicinal activities. In the present study, plant growth, chemical composition, and antitumor and antimicrobial properties ... -
Effect of phosphorus application rate on Mentha spicata L. grown in deep flow technique (DFT)
(2019)The present study evaluated the impact of phosphorus application rate on plant growth and physiological parameters, antioxidant activity, chemical composition, and essential oil yield and composition of hydroponically grown ... -
Energy aware buffer aided cooperative relay selection
(2016)In this paper we evaluate an energy-aware relay selection mechanism which exploits channel state information and the availability of buffers at relays to perform flexible relaying based on a backpressure-driven optimization ... -
Energy-Efficient UAV-Relaying 5G/6G Spectrum Sharing Networks: Interference Coordination with Power Management and Trajectory Design
(2022)As massive ground users access wireless networks with limited available spectrum, coexisting users that share the same spectrum band severely interfere with each other. Moreover, communication pairs without direct communication ... -
Enhancing QoS Through Fluid Antenna Systems over Correlated Nakagami-m Fading Channels
(2022)Fluid antenna systems (FAS) enable mechanically flexible antennas that offer adaptability and flexibility for modern communication devices. In this work, we present a conceptual model for a single-antenna N-port (SANP) FAS ... -
An Event-triggered Visual Servoing Predictive Control Strategy for the Surveillance of Contour-based Areas using Multirotor Aerial Vehicles
(2022)In this paper, an Event-triggered Image-based Visual Servoing Nonlinear Model Predictive Controller (ET-IBVS-NMPC) for multirotor aerial vehicles is presented. The proposed scheme is developed for the autonomous surveillance ... -
Exploring the Random Location Problem Inside a Truncated Conic Shape: Application in UAV Communications
(2022)More often than not, transmitters (Txs) in wireless networks operate using directional radiation patterns where the main radiation lobe creates a three-dimensional conic-shaped volume. In this context, any receiver (Rx) ... -
A Fault-Tolerant Control Scheme for Fixed-Wing UAVs with Flight Envelope Awareness
(2021)In this work a vertically integrated fault-tolerant control scheme for fixed-wing Unmanned Aerial Vehicles (UAVs) is presented. At its core, an online approximate Trim Flight Envelope generator yields the motion constraints ... -
A Fault-Tolerant Control Scheme for Fixed-Wing UAVs with Flight Envelope Integration
(2020)Fault-tolerant control is currently the most important step towards increased autonomy for Unmanned Aerial Vehicles (UAVs). In this work, we consider actuator and airframe faults in fixed-wing UAVs and show that an online ... -
Feedback-Based SSK Modulation: Constellation Design and Performance Results
(2020)In this article, we propose a limited feedback-based space-shift keying (SSK) modulation scheme where transmitter (Tx) obtains partial channel state information (CSI) via a feedback link from receiver (Rx). More specifically, ... -
Formation Control and Target Interception for Multiple Multi-rotor Aerial Vehicles
(2020)In this paper, we present a distance-based formation control strategy for multiple multi-rotor aerial vehicles participating in a target interception mission. The target moves arbitrarily, following a smooth 3D trajectory, ... -
Indoor Visual Exploration with Multi-Rotor Aerial Robotic Vehicles
(2022)In this work, we develop a reactive algorithm for autonomous exploration of indoor, unknown environments for multiple autonomous multi-rotor robots. The novelty of our approach rests on a two-level control architecture ... -
Joint beamforming and power control for CDMA uplink throughput maximization
(2007)We consider joint beamforming and power control as a means to maximize throughput in a CDMA wireless uplink, where a base station equipped with multiple antennas receives from single - antenna wireless users. Throughput ... -
Joule heating in the mid-latitude ionosphere by high power HF radio waves
(2022)We present an estimation of the heating rate due to Joule heating in the F region of the ionosphere as a result of its interaction with high-power HF O-mode radio waves transmitted by a ground-based antenna. We refer to ... -
Mixed THz/FSO Relaying Systems: Statistical Analysis and Performance Evaluation
(2022)In this paper, the performance of a mixed Terahertz/free-space optical (THz/FSO) wireless transmission system is studied, where the joint effects of channel fading and pointing errors are considered for both THz and FSO ... -
A modular simulation environment for multiple UAVs with virtual WiFi and sensing capability
(2018)Experiments with real unmanned aerial vehicles (UAVs) need considerable preparation, raise safety concerns, often require official flight permissions by authorities, and can be very costly in case of hardware or software ... -
MONITORING CASTOR BEANS MATURITY VIA REMOTE SENSING
(2022)Castor is a crop with an evergreen habit so artificial induced ripening is an essential precondition for mechanical harvesting of new dwarf annual hybrids. Plants water content impose a determinant effect both on preharvest ...