A5036448295- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- RFID technology advancements
- Full-Duplex Wireless Communications
- Underwater Vehicles and Communication Systems
- Antenna Design and Analysis
- IoT Networks and Protocols
- Innovative Energy Harvesting Technologies
- Advanced MIMO Systems Optimization
- Satellite Communication Systems
- Microwave Engineering and Waveguides
- Bluetooth and Wireless Communication Technologies
- Advanced Sensor and Energy Harvesting Materials
- Advanced Wireless Communication Technologies
- Opportunistic and Delay-Tolerant Networks
- Radio Frequency Integrated Circuit Design
- IoT-based Smart Home Systems
- Bat Biology and Ecology Studies
- Face recognition and analysis
- PAPR reduction in OFDM
- Advancements in PLL and VCO Technologies
- Geothermal Energy Systems and Applications
- IoT and Edge/Fog Computing
- Wireless Body Area Networks
- Indoor and Outdoor Localization Technologies
Polytechnic Institute of Viseu
2020-2024
Instituto de Telecomunicações
2015-2024
University of Aveiro
2014-2023
Portuguese Air Force Academy
2019-2023
University of Lisbon
2023
Inform (Germany)
2021
Weatherford College
2021
University of Helsinki
2020
Universidade Federal de Alagoas
2020
As 5G New Radio (NR) is being rolled out, research effort focused on the evolution of what to come in post-5G era. In order meet diverse requirements future wireless communication terms increased capacity and reduced latency, technologies such as distributed massive Multiple-Input Multiple-Output (MIMO), sub-millimeter wave Tera-hertz spectrum become technology components interest. Furthermore, demands connectivity anywhere at anytime, non-terrestrial satellite networks will be needed, which...
This invited paper presents potential solutions for tackling some of the main underlying challenges toward developing sustainable Internet-of-things (IoT) devices with a focus on eco-friendly manufacturing, powering, and wireless connectivity next-generation IoT devices. The diverse applications systems, such as smart cities, wearable devices, self-driving cars, industrial automation, are driving up number systems at an unprecedented rate. In recent years, rapidly-increasing...
This paper presents a holistic and authoritative review of the role microwave technologies in enabling new generation wearable devices. A human-centric Internet Things (IoT) covering remote healthcare, distributed sensing, consumer electronics, calls for high-performance devices integrated into clothing, which require interdisciplinary research efforts to emerge. Microwaves, "interconnect" wireless networks, can enable, rather than solely connect, next autonomous, sustainable,...
Radio frequency (RF) energy harvesting and wireless power transmission (WPT) technologies —both near-field far-field—have attracted significant interest for applications RFID systems. We already utilize WPT products in our life it is expected that RF EH far-field systems can drive the future low-power In this article, we initially present a brief historical overview of these technologies. The main technical challenges rectennas transmitters are discussed. Furthermore, paper presents recent...
Fully passive wireless networks are a key-enabling technologies for the internet of things. Backscatter radios hypothesis to design these networks. modulation allows remote device wirelessly transfer information without requiring traditional transceiver. Instead, backscatter leverages carrier transmitted by an access point or base station. Nevertheless, approach is use amplitude shift keying phase solutions which limits data rate sensors, since it transfers only one bit per symbol period. We...
Providing energy to Internet of Things (IoT) apparatuses is ever more challenging. Humans are increasingly invested in the revolutionary new scenario that experts call <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Industry 4.0</i> , where billions electronic devices interconnected with one another. The operations battery charging or replacement for these will soon become infeasible. As a consequence, radiative wireless power transfer (WPT)...
Nowadays wireless sensor networks (WSNs) depend on the battery duration and there is a lot of interest in creating passive network scheme area Internet Things (IoT) space-oriented WSN systems. Radio frequency (RF) energy harvesting enables control delivery power to RF devices. All devices made with this technology can be sealed, embedded these structures, or mobile, so they battery-independent. In paper, we show that it possible have complete could potentiate IoT space craft sensing. This...
Ambient backscatter uses radio frequency signals available in the environment (e.g., broadcasting, television, or mobile telephony) to transmit data effectively leading significant energy and cost efficiency increase. This paper presents a novel wireless tag, which for first time utilizes 4-pulse amplitude modulation technique modulate ambient backscattered FM order send nearby low-cost software defined reader. The tag is based on an RF front-end that single transistor controlled by...
This paper addresses backscatter communications as a new paradigm for Internet of Things (IoT) sensor wireless solutions. The clearly presents the history background technology and then makes summary more recent developments form several groups around world, with emphasis in US Europe groups. analysis done this will address circuit physical layer approaches such solution its real implementations, having mind IoT sensors long range high speed communications.
The rapid increase in the progress and development of wireless communications identification has led to billions devices applied Internet Things (IoT) context. Low-power sensors, passive-backscatter radios such as passive radio frequency identifications (RFIDs), RFID-enabled sensors are seen key-enabling technologies realize future ubiquitous IoT. This letter presents a system composed backscatter modulator at 2.45 GHz that consumption 61.5 fJ/b with power transfer capabilities 1.7 GHz....
This article describes the design of an IQ impedance modulator radio front-end which is used to generate long range (LoRa) symbols with backscattering techniques, allowing building low-power devices that may be compatible current LoRa networks. It shown a linear frequency modulated (LFM) chirp can generated by properly varying phase reflected wave instead directly its instantaneous frequency. The proposed device consists two (RF) transistors set impedances changing their gate bias,...
Fully passive wireless networks are an enable for the internet of things. One hypothesis this network implementation is to use backscatter radio nodes. Nevertheless, traditional approach ASK or PSK solutions that limits data rate sensors, since it transfers only one bit per symbol period. In order overcome these limitation, in paper we propose a novel sensor based 4-QAM modulation. The design strategy high level modulations will be explained and presented manuscript.
Let?s conform electronics to objects! Up now, the most common approach has been exactly opposite: size, weight, and shape of electronic devices around us have conformed electronics. However, Internet Things (IoT) vision will necessarily lead a paradigm shift, where need objects.
Wireless sensor networks depend strongly on the battery duration, creating a passive network scheme is one of key strategies for IoT and or space oriented WSN systems. One possibilities implementing this to use backscatter radios, which uses mechanism switching antenna load between two values with that implement simple low power modulation scheme. Nevertheless, depending load, energy harvesting degraded in impedance loads. This paper presents rectifier design harvest electrical powering...
Despite the rapid and continuous development of communication networking technologies, goal universal connectivity (i.e., ability to communicate with any user at time in place) is still unrealized. In 2019, a study <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref> found that 40% Earth’s regions lack network coverage, which means there are 4 billion people on planet without Internet access. Moreover, even as...
The research of safety applications in vehicular networks has been a popular topic an effort to reduce the number road victims. Advances on communications are facilitating information sharing through real time communications, critical for development driving assistance systems. However, communication by itself is not enough reach most desired target as we need know which safety-related should be disseminated. In this work, bring passive sensors and backscatter network world. idea increase...
In this letter, the authors present first millimeter-wave (mm-wave) high-order backscatter modulator, based on a BiCMOS technology for 5G/Internet of Things (IoT) applications. The design and implementation proposed system are described, followed by considered characterization measurement setup. This work presents chip that performs different orders modulation, M-quadratic-amplitude modulation (QAM), wide range operation both in frequency (20-28 GHz) as well with multiple values input power....
Wireless sensor nodes growth is limited by high cost and energy consumption. Backscatter communication over ambient sources has the potential to overcome these limitations since eliminate need of an active RF transmitter. In this work, we propose a dual-band 4-QAM backscatter circuit, which employs Wilkinson power divider combined with modulator composed two transistors responsible for generating modulation. The design strategy level order modulations will be explained approach presented in...
This paper provides a comprehensive study of the harmonics generated by frequency shifted backscatter communication system. The suppression and manipulability different are importance to avoid detrimental inter-user interference when number backscattering nodes (and perhaps also other active wireless users) operate simultaneously in network. In this widely adopted open-short tag architecture is firstly presented. Then ideal system which generates no unwanted discussed, inspires various...
This letter presents an mm-wave hybrid RF-dc converter based on a gallium arsenide (GaAs) chip for wireless power transmission (WPT) applications. Both and external low-pass networks are described, different scenarios considered measured. work very versatile system capable of operating at several frequencies, loads, scenarios. The proposed was evaluated considering on-chip measurement approach fully assembled circuit. In both scenarios, the circuit results close to simulated, where...
This work presents a novel wireless tag operating solely with ambient backscatter signals while featuring high-order modulation capabilities. Specifically, the proposed communicates low-cost software defined radio reader using principles on commercial FM station signals, sensing information from sensors can be modulated analog 4-pulse amplitude (4-PAM). The transceiver implementation is based an ultra-low-power microcontroller for data processing and RF frontend communication. A...
Backscatter communication has emerged as a promising technology for green communications and future IoT. This paper studies high order backscatter over OFDM carriers. For this purpose, bank of four band-pass filters been designed implemented well 4-QAM modulators. A prototype the system is proposed which operate in different frequencies, 2.39 GHz, 2.46 2.57 GHz 2.67 GHz. Further developments could fulfill promise ambient carriers air.
Applications on wireless sensing and internet of things (IoT) require communication systems based low power with high data rates. Thus, backscatter plays an important role in the new emerging IoT communications. In literature, several works have been reported about modulators high-order modulation formats. However, only square quadrature amplitude (S-QAM) scheme is considered, although it not optimal sense efficiency. this letter, performance two dimensional (2-D) signal constellations...