A5007934338- Advanced MIMO Systems Optimization
- Advanced Wireless Network Optimization
- Wireless Communication Networks Research
- Cooperative Communication and Network Coding
- Wireless Networks and Protocols
- Telecommunications and Broadcasting Technologies
- Energy Harvesting in Wireless Networks
- Wireless Body Area Networks
- Energy Efficient Wireless Sensor Networks
- Power Line Communications and Noise
- Millimeter-Wave Propagation and Modeling
- Cognitive Radio Networks and Spectrum Sensing
- Advanced Wireless Communication Techniques
- ICT Impact and Policies
- IoT-based Smart Home Systems
- Network Traffic and Congestion Control
- Antenna Design and Analysis
- Mobile Ad Hoc Networks
- IoT Networks and Protocols
- Bluetooth and Wireless Communication Technologies
- Software-Defined Networks and 5G
- Smart Materials for Construction
- Wireless Power Transfer Systems
- Advanced Wireless Communication Technologies
- Advanced Queuing Theory Analysis
University of Beira Interior
2015-2024
Instituto de Telecomunicações
2014-2024
Universidad Carlos III de Madrid
2020-2023
IS-Wireless (Poland)
2022
University of Lisbon
2002-2022
National and Kapodistrian University of Athens
2022
Carnegie Mellon University
2017-2022
Universidade Nova de Lisboa
2022
Technology Innovation Institute
2022
International Hellenic University
2022
Nowadays, wireless sensor network (WSN) users are demanding more and in terms of choice diversity applications. Hence, as the applications is increasing, it worthwhile to propose a structure for set characterization parameters that allows sketching taxonomy WSN This established via an application-oriented approach, identifying specific services offered by each application. In this survey, we fill gap literature describing parameters, organized into six different categories. Our application...
In this study, we propose a novel, to the best of our knowledge, all-optical Galois field (AOGF) adder that utilizes logic XOR gates. The design is founded on optical beams' constructive and destructive interference phenomenon incorporates phase shift keying technique within two-dimensional linear photonic crystal (2D-LPhC) structure. suggested AOGF comprises eight input ports four output ports. We employ finite difference time domain (FDTD) procedure obtain electric distribution in FDTD...
Wearable wireless medical sensors beneficially impact the healthcare sector, and this market is experiencing rapid growth. In United States alone, telecommunications services for sector forecast to increase from $7.5 billion in 2008 $11.3 2013. Medical body area networks improve mobility of patients personnel during surgery, accelerate patients’ recovery, facilitate remote monitoring suffering chronic diseases. Currently, MBANs are being introduced unlicensed frequency bands, where risk...
The radio frequency spectrum is getting more congested day by due to the growth of wireless devices, applications, and arrival fifth generation (5G) mobile communications. This happens because a natural resource that has restricted existence. Access all devices can be granted, but in efficient way. To resolve issue, cognitive technology come out as way, it possible sense neighboring. Spectrum sensing been recognized an important technology, networks, allow secondary users (SUs) detect holes...
Some applications of Wireless Sensor Networks (WSNs) to the automobile are identified, and use Crossbow MICAz motes operating at 2.4 GHz is considered together with TinyOS support. These WSNs conceived in order measure, process supply user diverse types information during an journey. Examples acceleration fuel consumption, identification incorrect tire pressure, verification illumination, evaluation vital signals driver. A brief survey on concepts presented, as well way wireless sensor...
In this paper, we identify the spectrum opportunities for radio frequency (RF) energy harvesting through power density measurements from 350 MHz to 3 GHz. The field trials have been performed in Covilhâ by using NAKDA-SMR analyser with a measuring antenna. Based on identification of most promising opportunities, dual-band band printed antenna operating at GSM bands (900/1800) is proposed, gains order 1.8-2.06 dBi and efficiency 77.6-84%. Guidelines design RF circuits choice textile materials...
This paper presents a study of the electrical and mechanical behavior several continuous carbon fibers epoxy composites for both strengthening monitoring structures. In these composites, arrangement was deliberately diversified to test understand ability self-sensing low strains. Composites with different arrangements textile weaves, mainly unidirectional reinforced were tested at dynamometer. A two-probe method considered measure relative resistance during loading. The measured includes...
The use of wearable biomedical sensors for the continuous monitoring physiological signals will facilitate involvement patients in prevention and management chronic diseases. fabrication small transmitting data wirelessly is possible as a result tremendous advances ultra-low power electronics radio communications. However, widespread adoption these devices depends very much on their ability to operate long periods time without need frequently change, recharge or even batteries. In this...
We introduce the concept of "pluralistic licensing", which we describe as award licenses under assumption that opportunistic secondary spectrum access will be allowed, and interference may caused to primary with parameters rules are known at point obtaining license. A key aspect is choose from a range offered licenses" each associated fees, specifying alternative characteristics. Our proposal novel means take forward licensing fair both users takes into account requirements parties. The...
This paper seeks to explore the integration of spectrum and network resource management functionalities benefit achieving higher performance capacity gains in an IMT-A scenario. In particular, we investigate allocation users over two frequency bands (i.e., 2 GHz 5 ones) for a single operator The same type RAT is considered both bands. It assumed that this work has gained access pool with certain portion available spectrum. non-shared band part (or all) at GHz. gain analyzed terms data...
The availability of relatively capable and inexpensive hardware components has made it feasible to consider large-scale systems autonomous aquatic drones for maritime tasks.In this paper, we present the CORATAM HANCAD projects, which focus on fundamental challenges related communication control in swarms drones.We argue for: (i) adoption a heterogeneous approach small subset have long-range capabilities while majority carry only short-range hardware, (ii) use decentralized facilitate...
This paper presents spectrum opportunities for radio frequency (RF) energy harvesting identified through power density measurements from 350 MHz to 3 GHz. The field trials have been performed in two different cities (Covilha and Lisbon), by using the NARDA-SMR analyser with measuring antenna, Signal Hound analysers, respectively. scope of our research considers RF devices, enabling convert direct current (DC), providing an alternative source supply wireless sensor network (WSN) devices....
In this paper, we discuss wireless sensor and networking technologies for swarms of inexpensive aquatic surface drones in the context HANCAD project. The goal is to enable swarm perform maritime tasks such as sea-border patrolling environmental monitoring, while keeping cost each drone low. Communication between essential success Preliminary experiments show that XBee modules are promising energy efficient multi-hop drone-to-drone communication.
To fulfil the requirements of 5G vision "everything everywhere and always connected", a new waveform must contain features to support greater number users on high data rate. Although Orthogonal Frequency Division Multiplexing (OFDM) has been widely used in 4th generation, but it can hardly meet needs vision. However, many waveforms have proposed cope with challenges. In this paper, we presented comparative analysis several candidates (FBMC, GFDM, UFMC, F-OFDM) basis complexity, hardware...
A classification for mobile broadband services and applications is proposed that distinguishes between interactive distribution services, identifies the types of information supporting each one. taxonomy also applications' characterization parameters, divided into five different types: service characteristics, traffic communications components, operation environments. Because multiservice analysis a system, with given mixture applications, requires definition their main environments,...
In the past years low power circuits design and networking techniques not only reduce total power, requirements for Wireless Sensor Networks (WSNs) but also allow supporting more complexity. this paper we present solutions WSN applications, aspects in context of patient
Smart Clothing is a project that combines research in textiles materials and wireless sensor actuator networks the context of human body monitoring with statistical methods for data analysis treatment. This aims mainly to aid foetal movement last four weeks pregnancy. Besides integration sensors garment there will be needed hierarchical communication system allows delivery collected from pregnant wearing doctor. The can either at home or hospital. In first stage tests are being made using...
IEEE 802.15.4 Medium Access Control (MAC) layer does not include the Request-To-Send/Clear-To-Send (RTS/CTS) handshake mechanism, in order to overcome hidden node problem that affects Wireless Sensor Networks (WSNs). In this paper we propose and analyse use of RTS/CTS for nonbeacon-enable mode. The proposed solution shows by considering mechanism combined with packet concatenation improve network performance terms maximum throughput, minimum delay bandwidth effciency. RTS/CTS, backoff...
This work proposes an empirical propagation model to obtain the path loss, and therefore determine average received power, of a signal for specific outdoor urban scenario with UAVs. The proposed 3D terrestrial cellular networks generalizes LUI is valid in frequency ranges from GSM, UMTS LTE technologies. We report experimental space, considering height, antennas base station tilt, sectorization, angle distances profile. included this study appropriately agrees theoretical model; hence,...