Showing papers by "Preben Mogensen published in 1991"

Urban area radio propagation measurements at 955 and 1845 MHz for small and micro cells

Abstract: Path-loss in urban area small and microcell environments is discussed. Results from dual-frequency measurements performed in urban areas at 955 MHz and 1845 MHz are presented. The mean difference in path loss between the two frequencies was found to be 10 dB, whereas the free-space loss is only 6 dB. The shadow-fading at the two frequencies was highly correlated. Therefore much of the experience from the 900-MHz band can be used for planning of new cellular systems in the 1800-2000-MHz band. M. Hata's (1980) prediction model was fitted to the data at both frequencies, but predicted too-low path loss at 1845 MHz. A modified Hata prediction model is proposed for use in the frequency range 1500 to 2000 MHz. The effect of low base station antenna heights is also discussed. >

Urban area radio propagation measurements for GSM/DCS 1800 macro and micro cells

Abstract: Extensive field strength measurements were made in Aalborg and Copenhagen at different base station locations and antenna heights in order to determine the antenna height influence on path loss. The measurements were performed simultaneously at 955 and 1845 MHz to get the exact difference in path loss between the two frequencies. Results from measurements in two areas in Aalborg are presented. They are compared with the path loss prediction model developed by Hata (1980) to see if it is suitable for very small cell size propagation modelling. The authors conclude that it is only applicable if extra terms are added. >