Title :
Effects of directional antennas at the base station on the Doppler spectrum
Author :
Petrus, Paul ; Reed, Jeffrey H. ; Rappaport, Theodore S.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
fDate :
3/1/1997 12:00:00 AM
Abstract :
We analyze the effect of directional antennas at the base station on the Doppler spectrum. It is well known that the Doppler spectrum is dependent on the probability density function (pdf) of the angle-of-arrival (AOA) of the multipath components at the mobile unit and the direction of the motion of the mobile. The Doppler spectrum is U-shaped, when the pdf of the AOA of the multipath components at the mobile is uniform. Here, however, we study the Doppler fading at the base station and assume that the scatterers are uniformly located around the mobile within a circle and derive the pdf of the AOA of the multipath components at the mobile when directional antennas are used at the base station.
Keywords :
Doppler effect; cellular radio; directive antennas; fading; land mobile radio; multipath channels; probability; Doppler fading; Doppler spectrum; angle-of-arrival; base station; directional antennas effect; mobile unit; multipath components; probability density function; uniformly located scatterers; Antenna accessories; Base stations; Calculus; Directional antennas; Distribution functions; Fading; Geometry; Mobile antennas; Probability density function; Scattering;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.559358
