Modelado y Analisis en Frecuencia del Canal UWB con Estadistica Lognormal para un Sistema MB-OFDM (Modeling and Analysis in Frequency of the UWB Channel with Lognormal Statistics for MB-OFDM Systems)

Gonzalo Llano Ramirez (gonllara@doctor.upv.es), Juan Reig (jreigp@dcom.upv.es), Lorenzo Rubio (lrubio@dcom.upv.es)


Universidad Politecnica de Valencia
This paper appears in: Revista IEEE América Latina

Publication Date: March 2009
Volume: 7,   Issue: 1 
ISSN: 1548-0992


Abstract:
In this paper, the ultra-wideband channel with multiband orthogonal frequency division multiplexing (MB-OFDM-UWB) is analyzed in the frequency domain. For UWB channels with Lognormal small-scale fading in time domain, we obtain closed analytical expressions for the parameters that model the sub-carrier fading statistics of MB-OFDM-UWB system, and we show that magnitudes of the channel frequency responses of each subcarrier can be approximated by a Nakagami-m random variable, where the fading parameter (m), mean power \Omega and the correlation \rho_{ij} are expressed in terms of the following parameters: arrival time of the clusters, inter-arrival time of the rays inside the clusters, and power decay constants of the rays and clusters.

Index Terms:
Ultra – wideband, Lognormal, Nakagami-m, MB-OFDM,   


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