G. Durgin et Ts. Rappaport, Basic relationship between multipath angular spread and narrowband fading in wireless channels, ELECTR LETT, 34(25), 1998, pp. 2431-2432
A novel relationship between the azimuthal distribution of multipath power
and narrowband small-scale fading characteristics is developed. The fundame
ntal relationship is useful for studying adaptive arrays, smart antennas, e
qualisation, diversity, and any other wireless technology or concept that d
epends on the spatial characteristics of radiowave and microwave propagatio
n.