Typical and worst case channel path loss, RMS delay spreads, and excess delay spreads (10 dB down) at 900 MHz in four European cities using typical cellular and microcellular antenna locations are presented. It is shown that a change in reference distance from 1 km to 100 m can change the perceived propagation power law exponent from 30 to 2-7, where free space propagation is assumed from the transmitter to the reference distance. This is a significant result, since the path loss directly affects the frequency reuse efficiency in CDMA spread spectrum systems. Measured data show that for microcellular sites, RMS delay spreads are less than 2µzs, with excess delay spreads (lOdB) less than 6µs. At typical cellular locations with high base antennas, RMS delay spreads are generally less than 8µs and excess delay spreads (10dB) are less than 16µis. Worst case measurements resulted in a RMS delay spread of 19-6µiS and an excess delay spread of 51-3µS.
- Cellular radio systems
- Personal communications
- Radiowave propagation
ASJC Scopus subject areas
- Electrical and Electronic Engineering