Roberto Bustamante

Universidad de Los Andes

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Roberto Hincapié

Universidad Pontificia Bolivariana

Jian Tang

Midea Group (China)

Javier E. Sierra

Instituto Politécnico Nacional

Leonardo Betancur

Universidad Pontificia Bolivariana

Guoliang Xue

Arizona State University

Carlos-Iván Páez-Rueda

Pontificia Universidad Javeriana

Cristina Gómez

Madrid Health Service

Roberto G. Rojas

MIT Lincoln Laboratory

Carlos A. Díaz

Eduardo Rodríguez Araque

Fundación Universitaria Cafam

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Universidad Pontificia Bolivariana

Universidad de Los Andes

Universidad Politécnica de Madrid

Consejo Superior de Investigaciones Científicas

The Ohio State University

Montana State University

Universidad Complutense de Madrid

Museum of Decorative Arts in Prague

Polytechnic University of Puerto Rico

Universidad de Valladolid

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Modelo de simulación de la capa MAC IEEE 802.16-2004 para modo Mesh

Javier E. Sierra Roberto Hincapié Roberto Bustamante Leonardo Betancur

IEE E 802.16-2004 standard supports mesh networks topology and its important to realize the performance of such systems. Simulation of communication systems ...

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Efficient Recovery Algorithms for Wireless Mesh Networks with Cognitive Radios

IEEE International Conference on Communications (2009)

Roberto Hincapié L. Zhang Jian Tang Guoliang Xue R. S. Wolff

Cognitive radios allow unlicensed wireless users to access channels that are in the licensed spectrum bands. However, in a wireless network with cognitive radios, when a licensed user becomes active on a channel in a certain area, nodes and links that were using that channel must release it, which will cause traffic failures. Simple and effective recovery schemes are needed to re-allocate available resources for the failed traffic. In this paper, we study the failure recovery in wireless mesh networks with cognitive radios. We formally formulate the corresponding problems as integer linear programming problems. By solving them, we can obtain optimal solutions. Moreover, an efficient distributed heuristic algorithm is presented for fast recovery. Simulation results show that the performance given by our distributed algorithm is close to that of the optimal solutions.

Mesh networking

10.1109/icc.2009.5198977

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Consolidación y restauración de la fachada norte del Senado de España mediante reanclados, armados, sellados y coberturas

Informes de la Construcción (2015)

Roberto Bustamante Juan Monjó Carrió

los contenidos de la edición electrónica de Informes de la Construcción se distribuyen bajo una licencia de uso y distribución Creative Commons Reconocimiento no Comercial 3.0.España (cc-by-nc). RESUMENLa consolidación y restauración de elementos existentes en la fachada norte del antiguo edificio del Senado de España se ha basado en el reanclado de las molduras macizas del recercado de huecos y de las molduras huecas de cornisas, ambas de piedra artificial, con varillas de poliéster reforzado con fibra de vidrio; en la eliminación del revoco existente y la realización de uno nuevo en dos capas, armando con malla de fibra de vidrio la capa base de cal hidráulica previamente a la aplicación de la capa de terminación de cal aérea; en la apertura de juntas de retracción selladas con silicona neutra, tanto de las molduras como del revoco, y en la cobertura de las superficies horizontales de los elementos salientes con chapa de zinc (molduras, guardapolvos y vierteaguas).Se exponen los estudios previos con los resultados de la documentación histórica, el análisis de los materiales y el diagnóstico de las lesiones que sustentan la intervención.

10.3989/ic.14.078

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Combining beamforming and spatio-temporal coding in macrocell channels with known transmit matrix correlation

Cristina Gómez Roberto Bustamante

This article proposes a novel method to fully exploit the diversity gain of a system with multiple antenna elements at the transmitter and receiver in the downlink of a single user macrocell scenario including important effects of the channel as frequency selectivity and spatial correlation. The scheme obtained is composed of an eigenbeamformer, a power loading algorithm, an Orthogonal Space-Time Block Code (OSTBC) and a pre-delayer, which combined extract the maximum spatial and multipath diversity of the system. A geometrically based stochastic channel model is used to evaluate the performance of the system. Simulation and analytical results are presented comparing the performance of the proposed system with previous schemes. Finally results regarding the impact of physical parameters of the channel in the system are also included.

Macrocell

Spatial correlation

Antenna diversity

Diversity gain

Transmit diversity

Transmitter power output

10.1109/colcomcon.2013.6564833

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Interfaz de gravilla de los frisos de cal de las casas del centro histórico de Maracaibo, Venezuela = Gravel Interface of Lime Rendering of the Houses of Historical Centre of Maracaibo, Venezuela

S. Pineda Muñoz Roberto Bustamante

Resumen Se analizan los frisos o revocos de las pocas viviendas construidas a fines del siglo XIX, y que aun existen, en el casco historico de Maracaibo, cuya caracteristica peculiar es que se componen de dos capas, con una gravilla en la interfaz de contacto entre ambas. Los granos proceden de la desagregacion de la misma piedra con la cual se ha levantado la mamposteria de estas construcciones, una arenisca lutitica ferruginosa conocida como “piedra de ojo”, cuya formacion esta ligada a la sedimentacion del lago Maracaibo. Estos revocos amasados con agua salada son de cal y una carga inerte compuesta de arena, arcilla, oxidos de depositos fluviales y adiciones de fibras vegetales. A partir del analisis granulometrico se ha determinado aproximadamente la composicion en volumen de cal/arena-arcilla de las muestras analizadas, con una alta proporcion de agregados. Son muy porosos y con baja resistencia mecanica, habiendose determinado solamente en una de las muestras el modulo de elasticidad dinamico. Abstract Renderings of a few still standing houses, built around the end of the XIX Century, and located in Maracaibo Historical Center were analyzed, and it was noted, as a particular characteristic, that said renderings are made up of two layers, having a gravel interface between both layers. Grains come from the disintegration of the same stone used in building the masonry of these constructions, which is a lutitic (shaley) sandstone with ferruginous matrix known as “eye stone sandstone”, which is intimately linked to the sedimentation of the Lake of Maracaibo. These lime renderings were mixed with salt water, and they are made of lime and an inert charge composed of sand, clay, fluvial oxide deposits and vegetable fiber additions. From samples grain size analysis the volumetric composition of the lime/sand-clay has been approximately determined, having a high proportion of aggregates. They are quite porous and have low mechanical resistance, and the dynamic elasticity modulus was determined only in one of the samples.

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Novel computational approach to solve convolutional integral equations: method of sampling for one dimension [Online First]

Ingenieria y Universidad (2019)

Carlos-Iván Páez-Rueda Roberto Bustamante

Objective: This paper proposes a new methodology to solve one-dimensional cases of integral equations with difference kernels using Fourier analysis. Methodology: In this study, it was proven that any Fredholm equation of the first kind can be expressed as an extended convolutional problem; consequently, a new approach to solve that problem, using the nonideal instantaneous sampling theory and Fourier analysis, can be developed. Results and Discussion: The proposal was extensively evaluated and compared with the method of moments by considering two benchmarks. The first was a narrowband problem related to a second-order differential equation with specific boundaries. The second was a standard wideband problem related to wire antenna radiation in electrodynamics, known as the Pocklington equation. In both cases, we derived new interpretations and different approaches to solve the problems efficiently. Conclusions: The new proposal generalized the method of moments via new interpretations, strategies and design rules. We found that the techniques based on the method of moments are point-matching procedures independent of the weighting functions; the basis functions can be designed as generalized interpolation functions with more information provided by the original domain; the weighting functions literally represent a sampled linear filter; the unknown continuous function can be approximated without using the classical variational approach; and several new strategies based on the Fourier transform can be used to reduce the computational cost

Basis function

Interpolation

10.11144/javeriana.iyu23-2.ncas

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Remote locations coverage analysis with wireless mesh networks based on IEEE 802.16 Standard

IEEE Communications Magazine (2007)

Roberto Hincapié Javier E. Sierra Roberto Bustamante

This article analyzes the wireless coverage problem of remote regions with low user density and propagation problems due to irregular terrain and high tree density. The use of a wireless mesh network is proposed as a solution where user data is transmitted directly to a base station when it is possible or relayed through other nodes in a multi-hop manner when there is not a direct link. The mesh topology uses short links with higher capacity instead of long links with low capacity. We analyze radio propagation and MAC protocols, including random sources, queues, and packet delays. The article is based on the coverage of a realistic rural region near Medellin, a mid size city in Colombia, and it shows that a wireless mesh network is an alternative to a typical cell based solution. It includes propagation analysis and MAC protocol behavior, so it is not limited to a radio coverage problem but also traffic, scheduling, and routing analysis

Switched mesh

Shared mesh

IEEE 802.11s

Mesh networking

10.1109/mcom.2007.284547

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QoS Routing in Wireless Mesh Networks with Cognitive Radios

Roberto Hincapié Jian Tang Guoliang Xue Roberto Bustamante

In this paper, we study QoS routing in wireless mesh networks with cognitive radios, which involves route selection, channel allocation and scheduling. It turns out to be a hard problem because of the impact of interference and channel heterogeneity. We formally model it as an optimization problem and present an integer linear programming (ILP) formulation to provide optimal solutions. We then present a distributed routing protocol which can select a route and allocate resources for a connection request to satisfy its end-to-end bandwidth requirement. NS2 based simulation results show the performance given by our protocol is close to that of the optimal solution.

Channel allocation schemes

10.1109/glocom.2008.ecp.933

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Integrated simulation of distributed generation systems for the design of telecommunication networks with IEC61850-7-420 standards

José González Roberto Bustamante

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Multiuser system with joint transmit-receive space-time equalization and power control in outdoor channels

Cristina Gómez Roberto Bustamante

Cochannel interference (CCI) and InterSymbol Interference (ISI), are two main impairments that affect the performance of a wireless system. In this article the Duality Principle widely known is used to propose a Multiuser system with antenna arrays and equalization at both ends of the wireless link. For this system a Joint Multitap Transmit-Receive and Power Control algorithm for a channel with ISI, is obtained as an extended version of a previous proposal made for a joint single tap transmit-receive and power control algorithm for channels with no ISI, with the objective to Minimize the sum of the Total Transmitted Power while keeping the Signal to Interference plus Noise Ratio (SINR) above a target at all links. Channel estimation is also included, in order to study its impact on the performance of the system and have more realistic approximations of its behavior. Simulations were performed in order to obtain numerical results in terms of Interference Probability.

Transmitter power output

Signal-to-interference ratio

10.1109/colcomcon.2013.6564835

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