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Ítem A statistical channel model for on body Area networks in Ultra Wide Band Communications(IEEE, 2009-09-10) Cardona, NarcisThis paper presents a novel statistical channel model for Ultra Wide Band Communications when On Body Area Networks Environments are considered. Results and Analysis of frequency measurements from 1GHz to 12GHz for body area networks are described. We propose a modified Saleh-Valenzuela statistical channel model considering different assumptions for small scale statistics in the model. Results show that the small scale amplitude follows a log normal distribution, the inter arrival times between multi path components are poisson process; the decay factor, the number of paths and clusters follow exponential distributions. The proposed model can be used for realistic simulations for on body communications in Ultra Wide Band systems. © 2009 IEEE.Ítem Redes de área corporal. Una perspectiva al futuro desde la investigación(Universidad Icesi, 2011-03-01) Betancur, LeonardoBody Area Networks (BAN) is a growing field for such applications like Health monitoring and health related issues. Recently, new standards and technologies have been proposed, like Bluetooth, ZigBee, Ultra Wide Band (UWB), ECMA 386, WiFi, LTE, etc, oriented to provide solutions to different problems and requirements arising from our current life style. This document presents a revision of the current developments in Body Area Networks from a research point of view, revising aspects of standardization, applications and future trends in this amazing field.Ítem Modelo de simulación de la capa MAC IEEE 802.16-2004 para modo Mesh(Universidad Icesi, 2007-03-08T21:50:16Z) Sierra, Javier Emilio; Bustamante Miller, Roberto; Betancur, Leonardo; Hincapié Reyes, Roberto CarlosIEEE 802.16-2004 standard supports mesh networks topology and its important to realize the performance of such systems. Simulation of communication systems allows its optimization in performance measures. In this article we present a model developed over Network Simulator 2 to simulate data link layer operation in mesh topologies based on that standard. We present the results based on a link scheduler and the model developed, as the mean queue length, mean queue delay and the system capacity for different topologies.Ítem A novel SNR estimation algorithm for MB OFDM ultra wide band communications(IEEE, 2014-09-10) anavarro@icesi.edu.coIn this paper we propose a novel signal to noise ratio algorithm based on the moments of the received signal. The novel algorithm has been designed for Multi Band Orthogonal Frequency Division Multiplexing (MB-OFDM) communication systems in ultra wide band channels. The proposed algorithm is a switched estimator that uses two equation models, one is for large SNR scale and the other for low SNR scale. The proposed model can be used for SNR estimation in adaptive modulation and channel estimation and link quality control in MB OFDM systems. This algorithm can be implemented in receivers with simple structures. The performance of the proposed SNR estimation algorithm and its comparison with other SNR estimators was achieved through simulations. © 2009 IEEE.