On the scatterers' mobility and second order statistics of narrowband fixed outdoor wireless channels

Authors:
Petros Karadimas;Efstathios D. Vagenas;Stavros A. Kotsopoulos
Affiliations:
Centre for Wireless Network Design, Department of Computer Science and Technology, University of Bedfordshire, Luton, UK and Wireless Telecommunications Laboratory, Department of Electrical and Co ...;Wireless Telecommunications Laboratory, Department of Electrical and Computer Engineering, University of Patras, Rio-Patras, Greece;Wireless Telecommunications Laboratory, Department of Electrical and Computer Engineering, University of Patras, Rio-Patras, Greece
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

In this paper, we study the temporal behavior of narrowband fixed outdoor wireless channels by modeling the impact of scatterers' mobility on the second order statistics of such channels. We show that the Nakagami-m, gamma, Weibull and lognormal probability density functions (PDFs) can adequately approximate the scatterers' mobility at outdoor environments by comparing the theoretically derived autocorrelation functions (ACFs) with measured ACFs. These theoretical ACFs arise after considering several candidate PDFs for the impact of scatterers mobility. We select that PDF whose ACF provides the best fitting to measurements. The modeling of scatterers' mobility lead us to present analytical expressions for the level crossing rate (LCR) and average fade duration (AFD) together with an exact expression for the power spectral density (PSD).