Digital Radiocommunication Systems Tetrapol and Tetra

Import 01/09/2009HÁNA, I. Digitální radiokomunikační systémy Tetrapol a Tetra. Diplomová práce, Ostrava, VŠB-TU, FBI, 2009, 82 s. Diplomová práce se zabývá popisem a porovnáním digitálních radiokomunikačních systémů Tetrapol a Tetra. V první části jsou uvedeny současně používané digitální radiokomunikační systémy ve světě a v Evropě. V dalších částech jsou podrobněji popsány digitální radiokomunikační systémy Tetrapol a Tetra a jsou porovnány jejich vlastnosti. Součástí práce je také průzkum požadavků uživatelů na radiokomunikační systém a průzkum spokojenosti se stávajícím systémem. V závěrečné části práce je nastíněna prognóza rozvoje národní radiokomunikační sítě Pegas včetně návrhu způsobu spojení Hasičského záchranného sboru ČR.HÁNA, I. Digital radio-communication systems Tetrapol and Tetra. The Diploma thesis, Ostrava, VŠB-TU, FBI, 2009, 82 p. Diploma thesis deals with the description and comparition of the digital radio–communication systems Tetrapol and Tetra. In the first part I specify contemporary used digital radio-communication systems in the world and Europe. In further parts the digital radio-communication systems are described in detail and their system attributes compared. The part of the thesis is also a user request survey on radio-communication system and content survey with the present system. Diploma thesis outlines the development forecast of national radio-communication network Pegas including suggestion of communication method of Fire rescue service of the Czech Republic.Prezenční030 - Katedra požární ochrany a ochrany obyvatelstvavýborn

Improved electromagnetic compatibility standards for the interconnected wireless world

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The future is wireless, a world where everything is interconnected. However, the current standards for ensuring the electromagnetic compatibility (EMC) and the coexistence of such wireless systems urge for a major update. It is shown how novel statistical approaches based on the amplitude probability distribution detector and time-domain measurements are better suited for estimating the degradation caused by electromagnetic interferences on digital communication systems than the established practice of determining compliance according to the quasi-peak detector levels using a pass/fail criterion. Therefore, a redefinition of the test methods and of the compliance requirements in terms of EMC standards must be a priority of the international standardization bodies. Finally, a discussion of the fundamental challenges involved in this standardization breakthrough for EMC is delivered.Postprint (author's final draft

Uncoordinated access schemes for the IoT: approaches, regulations, and performance

Internet of Things (IoT) devices communicate using a variety of protocols, differing in many aspects, with the channel access method being one of the most important. Most of the transmission technologies explicitly designed for IoT and Machine-to-Machine (M2M) communication use either an ALOHA-based channel access or some type of Listen Before Talk (LBT) strategy, based on carrier sensing. In this paper, we provide a comparative overview of the uncoordinated channel access methods for IoT technologies, namely ALOHA-based and LBT schemes, in relation with the ETSI and FCC regulatory frameworks. Furthermore, we provide a performance comparison of these access schemes, both in terms of successful transmissions and energy efficiency, in a typical IoT deployment. Results show that LBT is effective in reducing inter-node interference even for long-range transmissions, though the energy efficiency can be lower than that provided by ALOHA methods. The adoption of rate-adaptation schemes, furthermore, lowers the energy consumption while improving the fairness among nodes at different distances from the receiver. Coexistence issues are also investigated, showing that in massive deployments LBT is severely affected by the presence of ALOHA devices in the same area

RADIOGIS software that can be incorporated to ArcView 9 as a new toolbar for the calculation of radioelectric coverage of radiocommunication systems.

[ESP]1. Cálculos: • Coberturas de potencia, de campo eléctrico o de densidad de potencia. Modelos de propagación: Entorno rural: Meeks y UITR-526- Entorno urbano: Hata, COST231 y Xia-Bertoni.- Indoor: Trazado de rayos y UTD.• Porcentaje sobre umbral: utilizando una capa vectorial que contenga términos municipales, términos provinciales, carreteras, comarcas, distritos municipales, etc.; o bien sobre un polígono, línea o rectángulo.2. Gestión de Bases de Datos. • De emplazamientos.• De coberturas radioeléctricas de potencia.• De mapas de densidad de potencia o de campo eléctrico.• De sistemas de potencia. • De mapas múltiples de potencia o de campo eléctrico.• Campañas de medidas.• Operaciones de gran utilidad con información raster.[ENG] 1. Calculations • Power, electric field or power density coverage • Propagation models: - Rural environment: Meeks and UITR-526 - Urban environment: Hata, COST231 and Xia-Bertoni - Indoor: Ray tracing and UTD • Percentage over threshold using a vectorial layer which includes municipal areas, provincial areas, roads, districts, etc. or with reference to a polygon, a line or a rectangleB. Management of Databases• Location databases • Power radioelectric coverage databases • Power density or electric field maps databases• Power systems databases • Multiple power or electric field maps databases • Measurement campaigns • Highly useful operations with raster information databases[ESP]RADIOGIS es una herramienta basada en el Sistema de Información Geográfica (SIG) ARCVIEW 9 y desarrollada por el Grupo (SiCoMo) de la Universidad Politécnica de Cartagena, España. RADIOGIS aprovecha todas las facilidades de tratamiento de la información de los SIG, y es tanto un software de gestión de bases de datos de sistemas de radiocomunicaciones como una potente herramienta para el cálculo radioeléctrico. Nuestro objetivo es alcanzar acuerdos de cooperación tecnológica para ofrecer la tecnología al mercado. Los potenciales clientes son pequeñas empresas que deseen planificar sistemas de radiocomunicaciones como GSM, UMTS, TETRA, LMDS, MMDS, WiFi o TDT.[ENG]RADIOGIS is a radio planning tool based on the Geographic Information System (GIS) ARCVIEW 8.2 and developed by the SiCoMo Group at the Technical University of Cartagena, Spain. RADIOGIS takes advantage of all of the SIG facilities for treatment of information and therefore, is both a software for the management of radiocommunication systems databases and a powerful tool for radioelectric calculation. Our aim is to achieve tecnological agreement to offer this technology to the market. The potential clients are telecommunication enterprises, which need application for planning radio communication systems GSM, UMTS, TETRA, LMDS, MMDS, WiFi o TDT.[ESP]- Reducción de costes - Versatilidad [ENG] - Reduction in costs - Versatility[ESP]“Desarrollo e implementación de modelos de propagación electromagnéticos para la predicción de parámetros del canal de radiocomunicaciones.”Las medidas que se realizan están encaminadas a validar y ajustar los modelos de propagación desarrollados y a conocer las particularidades del canal de radiocomunicaciones en cada tipo de entorno (rural, urbano, interiores, etc.). Además de medidas en banda estrecha para estimar las pérdidas por propagación y que encuentran aplicación en la planificación de sistemas de comunicaciones móviles de primera y segunda generación (como el GSM), en estos momentos, se están llevando a cabo medidas de banda ancha que evalúan no sólo las pérdidas sino también la dispersión del canal en el tiempo y en el espacio y que encuentran aplicación en sistemas de tercera generación como el UMTS. Las medidas se centran en entornos microcelulares y entornos especiales como túneles.“Desarrollo de aplicaciones informáticas basadas en sistemas de información geográfica (SIG) para la planificación de sistemas de comunicaciones móviles.” Las herramientas informáticas son cada vez más necesarias para la planificación óptima y eficiente de los sistemas de comunicaciones móviles. Estas herramientas tienen que ser capaces de manejar gran volumen de información espacial (modelo digital del terreno, mapas de tráfico, mapas de cobertura radioeléctrica, etc.). Por ello, en el grupo se desarrollan aplicaciones que basadas en sistemas de información geográfica, encuentran aplicación en la planificación de sistemas de radiocomunicaciones digitales.[ENG] “Development and implementation of electromagnetic propagation models for the prediction of radio channel parameters.”This line of research concerns propagation models which forecast the propagation losses as well as the dispersion in time and space introduced by the radio channel. These models are developed from electromagnetic theories based on Physical Optics and Geometrical Optics in addition to ray tracing techniques, and are implemented in a high-level programming language such as C++. Currently, microcellular urban environments as well as special ones such as tunnels are under study, achieving MIMO-channel models (Multiple Inputs Multiple Outputs) which yield a higher speed data transmission in the radio interface without needing greater bandwidth. “Experimental radio channel measurements.” The undertaken measurements are aimed at validating and refining the developed propagation models and at studying the particularities of the radio channel in every kind of environment (rural, urban, indoor, etc.). Apart from narrow-bandwidth measurements to estimate the propagation losses, which can find application in the planning of first and second generation mobile communications systems (as GSM), at the present time, wide-bandwidth measurements as well as MIMO channel measurements are also being carried out. The wide-bandwidth measurements are undertaken in order to evaluate, not only the mentioned propagation losses, but the channel dispersion in time and space, and could be applied in third generation systems such as UMTS. The MIMO channel measurements use multiple antennas in both the transmission and reception and significantly succeed in improving the channel capacity. Both kind of measurements are focused on microcellular environments and special ones such as tunnels. “Software development based on Geographic Information Systems (GIS) for the planning of mobile communication systems.” Computing tools are turning out to be an essential step for an optimal and efficient planning of mobile communication systems. These tools must be able to handle a big amount of spatial information (digital terrain model, traffic maps, radioelectric coverage, etc.). Therefore, the research group is developing applications which, based on Geographic Information Systems, can be applied in the planning of digital radiocommunication systems

SymbioCity: Smart Cities for Smarter Networks

The "Smart City" (SC) concept revolves around the idea of embodying cutting-edge ICT solutions in the very fabric of future cities, in order to offer new and better services to citizens while lowering the city management costs, both in monetary, social, and environmental terms. In this framework, communication technologies are perceived as subservient to the SC services, providing the means to collect and process the data needed to make the services function. In this paper, we propose a new vision in which technology and SC services are designed to take advantage of each other in a symbiotic manner. According to this new paradigm, which we call "SymbioCity", SC services can indeed be exploited to improve the performance of the same communication systems that provide them with data. Suggestive examples of this symbiotic ecosystem are discussed in the paper. The dissertation is then substantiated in a proof-of-concept case study, where we show how the traffic monitoring service provided by the London Smart City initiative can be used to predict the density of users in a certain zone and optimize the cellular service in that area.Comment: 14 pages, submitted for publication to ETT Transactions on Emerging Telecommunications Technologie

Novel EMI assessment method based on statistical detectors to protect sensitive digital radio receivers

© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper presents a methodology to assess the degradation performance caused by EMI to digital radio receivers. The procedure developed employs statistical information of the interference and the communication signal to create estimators capable of classifying the disturbances according to metrics like the BER. The estimator is computed using machine learning techniques to relate the changes introduced to the APD diagram with the BER. The methodology has been validated through a laboratory experiment, where a narrowband QPSK system is interfered by additive white gaussian noise with different duty cycle and power level parameters. The validation results show that the estimator operates correctly and overcomes the problematics of relaying on the peak or weighting detectors with fixed resolution bandwidth.The project on which these results are based has received funding from the European Union's Horizon 2020 research and innovation programme under Marie Skłodowska-Curie grant agreement No. 801342 (TecniospringINDUSTRY) and the Government of Catalonia's Agency for Business Competitiveness (ACCIÓ). This work was supported by the Spanish “Agencia Estatal de Investigación” under project PID2019- 106120RB-C31/AEI/10.13039/501100011033.Peer ReviewedPostprint (author's final draft

Electronic Signature Technology in Hungarian Governmental IT Projects in 2010-2015

To improve Hungarian e-governance capabilities by developing new IT services, the Hungarian Government has spent more than one hundred million Euros since 2010. As the base pillars of the Hungarian Digital State, a number of Controlled Electronic Administration Services (CEAS) have been implemented. The usability of any digital system which can be linked to trust depends on the authenticity of stored and processed information. Using unauthentic information may result in fraudulent activities, which should be avoided in the Administration. Electronic signatures are methods of authentication as defined by the 93/1999 Union enacted the Regulation (EU) No 910/2014 of the European Parliament and the Council called eIDAS. in September of 2014. eIDAS contains comprehensive and obligatory rules for applying electronic identification and electronic signature in Europe. It is the continuation of 93/1999 EU Directive, therefore addressing this topic is expected in IT projects in 2015. The examination was performed on IT projects coordinated by the Hungarian Governmental – Information Technology Development Agency. The analysis focuses on three questions: 1. Is electronic signature technology applied in project administration? 2. Which electronic signature attributes appear in the final results of the projects? 3. What kind of electronic signature dimensions appear in the projects? The presentation summarizes the main attributes of the examined projects, describes conceptual definitions of authenticity, gives a brief introduction into the electronic signature dimensions, and formulates conclusions about the success and lack of applying electronic signature elements in Hungarian Governmental IT projects