i-ETC : ISEL Academic Journal of Electronics Telecommunications and Computers
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54 research outputs found
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Floating sensor platform for the monitoring of water quality in urban and white-water environments
Full text linkIn the present paper the project of an embeddedsolution for the realization of a floating sensor platform for themonitoring of the water and ambient quality in a flowing waterenvironment is described. First results regarding the monitoringof the water conductivity and the ambient noise level underharsh environmental conditions in a karstic river and in the finalpart of a river going towards the Mediterranean Sea arepresented. It is further discussed how this kind of system can bemodified in order to serve as urban waterway multisensoryplatform, adding important features like connectivity, energyharvesting and determination of the platform position.
Backscatter radio communication for IoT applications
Full text linkThe so called Internet of Things (IoT) is progressivelybecoming a normal thing in everyone daily lives. Thedesire of connecting everyday objects to the internet and to eachother, to interact with other users and machines, is increasinglybecoming a reality. In this context, where billions of connectedobjects are expected to be ubiquitously deployed worldwide, thefrequent battery maintenance of wireless nodes is undesirableor even impossible. The growth of the devices will be madepossible only if the sensors battery needs are eliminated orreduced significantly. For low power sensors and devices, carefulpower management and power conservation are critical to devicelifetime and effectiveness. One of the possible solutions is tochange completely the paradigm of the radio transceivers in thewireless nodes of the IoT system. The new paradigm should beable to communicate and to enhance the power to the sensor byusing only electromagnetic waveforms transmitted over the air,in order to make the Wireless Power Transfer (WPT) concept areality
An implementation on GNURadio of a new model to ISDB-Tb using FBMC
Full text linkThe modulation technique Filter Bank Multi Carrier (FBMC) is an alternative widely studied in order to replace Orthogonal Frequency Division Multiplexing (OFDM) in wireless telecommunications systems. The fact that FBMC does not use Cyclic Prefix and uses Polyphase Filters allows improvements in bit rate, bandwidth efficiency and robustness against multipath channel impairments. This implementation can bring advantages to Digital TV case in comparison to the traditional OFDM based systems because of the need to transmit higher resolution videos such as 4K and 8K. This article presents a study on the use of FBMC in Integrated System Digital Broadcasting Transmission B (ISDB-Tb), developing an application on GNURadio environment, analysing Bit Error Rate (BER) and power spectrum curves in a multipath channel
A Survey on the 5th Generation of Mobile Communications: Scope, Technologies and Challenges
Full text linkThe 5th Generation (5G) of mobile communicationswill impact the costumers Quality of Experience (QoE) by ad-dressing the current mobile networks usage trends and providingthe technological foundation for new and emerging services.Additionally, 5G may provide a unified mobile communicationplatform, with multiple purposes, leveraging industries, servicesand economic sectors. In this paper, a 5G tutorial is presented,including the 5G drivers, main use cases, vertical markets anda current status of the standardization process. Furthermore,several 5G key enabling technologies are presented, concerningthe Radio Access Network (RAN) and Core Network (CN)perspectives. Finally, a brief outline over the Internet of Things(IoT) concept and current research topics is presented
Cyber Physical System applied in poultry production
Full text linka use case of poultry counting on a production line in Portugal is presented as a first step for Industry 4.0 application. Along the poultry production line there are several transformation and translation steps in which the fowls are subjected to, and their quantity in the line may change; some are removed or fall out and others are recovered and inserted in precise places of the line. Those changes can be used as an indicator of the status of the production line at that may influence the improvement of its efficiency. This paper presents a working solution of five wireless devices along a poultry production line and the complete system where data is stored locally for maintenance and supervisor decisions, and also data is stored at a remote database for management purposes which can be accessed by a mobile application
Wireless Communication Based on Chirp Signals for LoRa IoT Devices
Full text linkThis paper presents the study of chirp signals for wireless communications between Internet of Thing devices used on low power wide area networks. Up and down chirp concept is introduced as well as the chirp spread spectrum concept. A computationally efficient symbol decoding method is presented based of discrete Fourier transform as an alternative to typical coherent detection. The proposed simulation LoRa model is implemented in MATLAB allowing the communication system evaluation based on bit error rate and packet error rate
Optics in Data Processing and Data Transmission
Full text linkToday optical systems are more and more important in data communications (optical fibers) and are also becoming important in data processing (optical and quantum computing) allowing for a fully optical communication network where all signals will be processed and transmitted in the optical domain. This paper gives an overview of optical fiber communications and analyses some optical devices and applications such as optical computing, holographic memory and optical pattern recognition
The Interface and Control System of the Upgraded HVOpto/HVRemote Card of the TileCal
Full text linkTo comply with the increase in luminosity of the LHC (Large Hadron Collider) in the next decades, the electronics of the ATLAS (A Toroidal LHC Apparatus) experiment is being upgraded. Included in the upgrade is the interfacing and control electronics system of the HVOpto/HVRemote cards in the TileCal (Tile Calorimeter) detector, which provides high voltages to about 104 photomultipliers (PMTs). This paper presents the new interfacing architecture for the system and details the design of a prototype control board (HVRemote-Ctrl) used for test and validation of the new architecture. The tests evaluate the system multiplexing capabilities needed to monitor all the TileCal PMTs in real time. The communication channels involved, supported in Ethernet and SPI interfaces/protocols, have been fully tested. Some results from the tests already completed are presented
Optimal Control of a Multi-field Irrigation Problem: validation of a numerical solution by the optimality conditions
Full text linkIn this paper, we address the problem of minimizing the total water consumption over the period of a year used to supply different fields with different types of crops.We start by recalling a previous study, where the authors developed an optimal control model for this problem by minimizing the water flowing into a reservoir and where the water from the precipitation can be collected. The numerical solution obtained using such model is analyzed.The main result in this paper is the theoretical validation of the numerical solution via a verifications that such solution satisfies the necessary conditions of optimality in the form of a Maximum Principle. This way, we are giving further evidence of the optimality of the numerical solution found
A Flexible Amorphous Silicon Photovoltaic Module for Portable Electronics
Full text linkThis article reports on a monolithic 10 cm × 10 cm area PV module integrating an array of 72 a-Si:H n-i-p cells on a thin polyethylene-naphtalate substrate. The design optimization and device performance analysis are performed using a two-dimensional distributed circuit model of the photovoltaic cell. Experimental results show that the shunt leakage is one of the factors reducing the device performance. Using the LBIC technique, the multiple micro-shunts in the n‑i‑p cell were detected. The mechanism of electrical shunts formation is proposed and discussed