Telecomunicaciones

URI permanente para esta comunidadhttp://hdl.handle.net/10906/2021

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Capacity analysis in CDMA systems using GIS based planning tools
(EUROCOMM 2000. Information Systems for Enhanced Public Safety and Security. IEEE/AFCEA, 2010-04-14T15:43:12Z) Navarro Cadavid, Andrés
We show a simulation model for capacity analysis in mobile systems using a geographic information system (GIS) based tool, used for coverage calculations and frequency assignment, and MATLAB. The model was developed initially for “narrowband” CDMA and TDMA, but was modified for WCDMA. We show also some results for a specific case in “narrowband” CDMA
Ciberseguridad: los datos tienen la respuesta.
(Universidad Icesi, 2022-08-01) Henao, Brayan Andrés; Prada, Juan Sebastián; Pérez Belalcázar, Andrés Felipe; Bernal Tovar, Steven; Gaviria Jaramillo, Julio César; Ramírez, Ánderson; Delgado Villarreal, Jhoan Steven; Huertas Trujillo, David Alejandro; Vargas Plaza, Brayan José; Campaz Hurtado, Bayron Daymiro; Díaz Monsalve, Juan David; Gutiérrez Bolaños, Santiago; Castillo Meneses, Cristhian Eduardo; Zarama Luna, Kevin Gianmarco; Díaz Cely, Javier; Urcuqui López, Christian Camilo; Navarro Cadavid, Andrés; Urcuqui López, Christian Camilo; Navarro Cadavid, Andrés; Coordinadores
Este libro presenta la importancia de la información y la manera de utilizarla para el proceso de ciencia de datos, para luego introducir los fundamentos teóricos de ambas disciplinas y presentar su aplicación en ocho proyectos de investigación, los cuales buscan orientar al lector sobre cómo utilizar la inteligencia artificial tanto desde la perspectiva defensiva como en la ofensiva. En el aspecto defensivo, en el libro se aborda la realización de experimentos precisos para el desarrollo de modelos para la detección de malware en dispositivos Android, cryptojacking, deepfakes y botnets maliciosas; y en el enfoque ofensivo, se exploran modelos para la generación de contenido multimedia no legítimo y se introduce el concepto de aprendizaje seguro y la aplicación de adversarial machine learning como enfoque para encontrar los valores que permiten sesgar los resultados de un modelo de aprendizaje de máquina.
Ciberseguridad: un enfoque desde la ciencia de datos - Primera edición
(Universidad Icesi, 2018-12-01) Urcuqui López., Christian Camilo; Navarro Cadavid, Andrés; Osorio Quintero, José Luis; García Peña, Melisa
La creatividad y la creciente capacidad tecnológica de los cibercriminales hacen que garantizar la confidencialidad, integridad y disponibilidad de la información sea una tarea cada vez más compleja. Las metodologías tradicionales, como los sistemas determinísticos basados en perfiles y firmas, y los análisis descriptivos y diagnósticos, ya no son suficientes, por lo que es necesario probar con técnicas más complejas. En este libro, a partir de experiencias y experimentos precisos, se propone un procedimiento –base para la construcción de un framework–, con las actividades necesarias para el entrenamiento y la evaluación de modelos de machine learning, útil para: detectar malware en dispositivos con sistema operativo Android e identificar a priori aplicaciones web maliciosas.
Factores que afectan la capacidad en WCDMA y su influencia en la planificación de sistemas de tercera generación
(Congreso Iberoamericano de Telematica CITA 2003, 2010-04-14T16:52:19Z) Navarro Cadavid, Andrés
In this paper we use a model that we have developed for CDMA capacity analysis to see how different conditions like propagation model, number of cells and overlapping affect the estimation of CDMA capacity. We will show that the overlapping is not a direct parameter that affect capacity, and there are other factors to consider.
Métodos deterministas : del problema canónico al modelado de propagación.
(Universidad Icesi, 2020-11-01) Triana, Hernán G.; Navarro Cadavid, Andrés; Navarro Cadavid
La propagación de ondas radio sobre la superficie de la tierra es de crucial importancia para el disefio y modelado de sistemas de comunicaciones fiables, sin embargo, obtener modelos para predecir la propagación de ondas radio es actualmente un problema muy difícil, no se ha encontrado una solución analítica que, evaluada numéricamente, reproduzca el comportamiento de una onda observable; tampoco se tiene una solución numérica tridimensional que sea aplicable de forma general a todas las situaciones. En este libro se estudia el problema desde los escenarios canónicos hasta los escenarios de propagación troposférica, pasando por los problemas de propagación en escenarios exteriores urbanos y se provee un panorama detallado y actual que permite plantearse nuevas alternativas de investigación en el modelado de propagación de ondas radio
Some parameters that affect CDMA capacity analysis. Results using GIS based simulation
(3G Mobile Communication Technologies, 2001. Second International Conference, 2001-01-01T15:55:51Z) Cardona Marcet, Narcís; 2nd International Conference on 3G Mobile Communication Technology
In previous papers we describe a model for capacity analysis in CDMA systems using DC-Cell, a GIS based planning tool developed at Universidad Politecnica de Valencia, and MATLAB. We show some initial results of that model, and now, we are exploring different parameters like cell size, proximity between cells, number of cells in the system and “clustering” CDMA in order to improve the planning process for third generation systems. In this paper we show the results for variations of some of these parameters, specifically the cell size and number of cells. In CDMA systems is quite common to suppose only one carrier frequency for capacity estimation, and it is intuitive to think that for more base stations, mean more users. However the multiple access interference problem in CDMA systems could establish a limit for that supposition in a similar way that occurs in FDMA and TDMA systems.
The Influence of Propagation Model and Sectorization over WCDMA Capacity
(IASTED International Conference Communication Systems and Networks (CSN 2002), 2002-09-09T16:05:48Z) Cardona Marcet, Narcís
In this paper we use a dynamic model that we have developed for WCDMA capacity analysis using MATLAB and a GIS based planning tool, to estimate the capacity of a mobile system under different conditions like number of cells, propagation model, sectorization and handover margin.
Up-Link/Down-Link capacity Unbalance analysis in UMTS using a GIS based Planning Tool and MATLAB simulation
(WNCG 2003 Wireless Networking Symposium, 2003, Austin, 2003-01-01T16:44:31Z) Navarro Cadavid, Andrés
Capacity analysis using simulation is not a new thing in literature. Most of the development process of UMTS standardization have used simulation tools; however, we thing that the use of GIS planning tools and matrix manipulation capacity of MATLAB can show us different scenarios and make a more realistic analysis. Some work is been doing in COST 273 in order to have more realistic scenarios for UMTS planning. Our work initially was centered in uplink analysis, but we are now working in downlink analysis, specifically in two areas: capacity in number of users for RT and NRT services, and Node B power. In this work we will show results for up-link capacity and some results for downlink capacity and BS power consumption.
W-CDMA capacity analysis using GIS based planning tools and MATLAB simulation
(IEEE, 2000-03-29) 1st International Conference on '3G Mobile Communication Technologies
The evolution of cellular systems towards third generation (3G) or IMT-2000 seems to have a tendency to use W-CDMA as the standard access method, as ETSI decisions have showed. However, there is a question about the improvements in capacity and the wellness of this access method. One of the aspects that worry developers and researchers planning the third generation is the extended use of the Internet and more and more bandwidth hungry applications. This work shows the performance of a W-CDMA system simulated in a PC using cover maps generated with DC-Cell, a GIS based planning tool developed by the Technical University of Valencia, Spain. The maps are exported to MATLAB and used in the model. The system used consists of several microcells in a downtown area. We analyse the interference from users in the same cell and in adjacent cells and the effect in the system, assuming perfect control for each cell. The traffic generated by the simulator is voice and data. This model allows us to work with coverage that is more accurate and is a good approach to analyse the multiple access interference (MAI) problem in microcellular systems with irregular coverage. Finally, we compare the results obtained, with the performance of a similar system using TDMA.

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Examinando Telecomunicaciones por Autor "Navarro Cadavid, Andrés"