EFFECTS OF ANTENNA HEIGHT, ANTENNA GAIN, AND PATTERN DOWNTILTING FOR CELLULAR MOBILE RADIO

Results of wideband path loss and delay spread measurements using high gain, high and low antenna heights with pattern tilting are presented . The measurements were done in the frequency range 905-915 MHz, at tw o existing cellular mobile radio (CMR) sites. Also presented are poten tial approaches for analyzing data from high gain antennas. It is show n that, to a large extent, existing models can be used to predict path loss for high gain antennas with downtilting. The results further sup port the notion that high sites together with high gain antennas and s uitably selected pattern tilting can result in a significant reduction in path loss and delay spread, as well as reduction in power transmit ted from the cell site and reduction in system interference.