In this paper, we present a generalized theoretical model for the angle of arrival (AOA) in wireless channels when the scattering is two-dimensional (2-D) anisotropic. This model can constitute a platform for creating new angular distributions for the propagating multipath power and as such, a new distribution accounting for multi-modal arrival will be presented. The latter will represent the case that multipath power arrives into four angular sectors being parametrically defined with respect to the direction of the receiver motion. From the AOA, the power spectral density (PSD) of the received complex signal is analytically derived. Further generalization with multi-modal arrival into an arbitrary number of angular sectors can be treated similarly.
Karadimas, P., & Zhang, J. (2011). Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering. In PIERS 2011 in Marrakesh Proceedings (613-617)