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Ítem The UWB-OFDM Channel Analysis in Frequency(IEEE, 2009-06-12) Llano Ramírez, GonzaloIn this paper, the ultra-wideband channel with orthogonal frequency division multiplexing (UWB-OFDM) is analyzed in the frequency domain. For UWB-OFDM channels with log-normal fading in the time domain, we show that the amplitude of each subcarrier can be approximated by a Nakagami-m random variable, where the fading parameter, the mean power and the correlation coefficient are expressed in terms of the following parameters: time arrival of the clusters, inter-arrival time of rays inside clusters, and power decay constants of rays and clusters.Ítem Revisión del estado del arte de IR-Ultra-Wideband y simulación de la respuesta impulsiva del canal IEEE 802.15.4a(Universidad EAFIT, 2010-01-01) Suárez Páez, JulioThis paper reviews the state of the art of the technology based in channels of Ultra Wide band (UWB Ultra–Wideband) focusing on its regulation, standardization, basic applications, IEEE 802.15.4a channel model and simulation of the impulsive response of this type of channel. Also, it aims to introduce the reader to the technologies based on IR–UWB channels and the parameters for modeling and simulation of IEEE 802.15.4a UWB channel.