Title :
Effects of down tilt antenna on the multipath propagation characteristics in the presence of an imperfect obstacle
Author :
Soma, P. ; Ong, L.C. ; Chia, Y.W.M.
Author_Institution :
Centre for Wireless Commun., Nat. Univ. of Singapore, Singapore
Abstract :
This paper presents the effects of transmitter antenna down tilting on the propagation channel characteristics applicable to mobile radio communications for PCS. The transmitting antenna is assumed with a directional radiation pattern. The total received signal strength is the vectorial summation of the various multipath signals (reflected diffracted, and mixed, i.e., diffracted-reflected) in addition to the direct line-of-sight signal, if it exists. The results include path loss, Doppler power spectrum, level crossing rates and delay characteristics. These characteristics provide valuable information on the area coverage, selection of optimum transmitter location and the choice of suitable data rates of the digital communication system
Keywords :
antenna radiation patterns; digital radio; directive antennas; land mobile radio; multipath channels; transmitting antennas; Doppler power spectrum; PCS; area coverage; channel characteristics; delay characteristics; direct line-of-sight signal; directional radiation pattern; down tilt antenna; imperfect obstacle; level crossing rates; mobile radio communications; multipath propagation characteristics; optimum transmitter location; path loss; received signal strength; transmitter antenna; vectorial summation; Antenna radiation patterns; Antennas and propagation; Diffraction; Directive antennas; Land mobile radio; Mobile antennas; Mobile communication; Personal communication networks; Radio transmitters; Transmitting antennas;
Conference_Titel :
Microwave Conference, 1999 Asia Pacific
Print_ISBN :
0-7803-5761-2
DOI :
10.1109/APMC.1999.833665
