DOPPLER SPECTRUM IN MOBILE-TO-MOBILE COMMUNICATIONS IN THE PRESENCE OF 3-DIMENSIONAL MULTIPATH SCATTERING

This paper provides analytical expressions for the time-autocorrelatio n function and the Doppler spectrum in a mobile radio channel in the p resence of three-dimensional (3-D) multipath scattering, Mathematical modeling of the transmission channel is based on the assumption of wid e-sense stationary (WSS) scattering, This paper deals with the case of a mobile-to-mobile radio link and derives formulas for the mobile-to- radiobase link as a special case, The Doppler spectrum examples provid ed are typical when assuming mobile terminal(s) located in densely bui lt-up urban areas and simple dipole terminal antenna(s). Furthermore, the Doppler spectrum for transmission between a nongeostationary satel lite and a mobile terminal located on the ground is analyzed, If diffe rent antenna patterns are to be considered and detailed knowledge is a vailable on the multipath distribution, realistic Doppler spectra may be calculated using the approach presented in this paper.