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Generalized Clarke Model for Mobile Radio Rauf Iqbal, Thushara D. Abhayapala and Tharaka A. Lamahewa

Summary: 1
Generalized Clarke Model for Mobile Radio
Rauf Iqbal, Thushara D. Abhayapala and Tharaka A. Lamahewa
Clarke's classical model of mobile radio reception assumes isotropic rich scattering around the mobile receiver
antenna. The assumption of isotropic scattering is valid only in limited circumstances. In this contribution
we develop a generalized Clarke model, which is applicable to mobile radio reception in general scattering
environments. We give expressions for the autocorrelation and power spectral density (PSD) of the channel fading
process and demonstrate the generality of the model by applying it to different non-isotropic scattering scenarios.
Using the generalized model, we analyze the effect of mobile direction of travel and the non-isotropicity on the
statistics of the channel fading process. We also show that if the mobile direction of travel is equiprobable in all
directions, a non-isotropic scattering environment on average is as good as an isotropic scattering environment.
Index Terms
Non-Isotropic scattering, Rayleigh fading, Autocorrelation, Power Spectral Density, Power Azimuth Spec-
trum, mobile fading channel
In real world communication scenarios, the transmitter and/or the receiver may be in motion. In a mobile-
radio situation in which the transmitter is fixed in position while the receiver is moving, the direct line between
the transmitter and receiver may be obstructed by buildings. At ultra high frequencies and above, therefore, the


Source: Abhayapala, Thushara D. - Department of Information Engineering, Australian National University


Collections: Computer Technologies and Information Sciences