Title :
Microwave path-loss characteristics in urban LOS and NLOS environments
Author :
Masui, Hironari ; Ishii, Masanori ; Sakawa, Kozo ; Shimizu, Hiroyuki ; Kobayashi, Takehiko ; Akaike, Masami
Author_Institution :
YRP Mobile Telecommun. Key Technol. Res. Labs. Co., Ltd, Kanagawa, Japan
Abstract :
To model the path-loss characteristics of microwave propagation in urban environments, we performed measurements at frequencies of 3.35, 8.45, and 15.75 GHz in metropolitan Tokyo. The actual breakpoint (BP) distance was shorter than the theoretical one because of the influence of vehicles, pedestrians, and other objects on the road. This effect can be characterized in terms-of the effective road height. We also found that the BP disappeared when the mobile-antenna height approached the effective road height. In non-line-of-sight (NLOS) areas, the corner losses and attenuation coefficients were greater than those of the UHF band. The attenuation coefficients increased with LOS distance between the base station and the corner into NLOS area
Keywords :
electromagnetic wave absorption; land mobile radio; loss measurement; microwave antennas; microwave links; microwave propagation; mobile antennas; 15.75 GHz; 3.35 GHz; 8.45 GHz; SHF; attenuation coefficients; breakpoint distance; effective road height; line-of-sight areas; metropolitan Tokyo; microwave path-loss characteristics; microwave propagation; mobile-antenna height; nonline-of-sight areas; pedestrians; urban LOS environments; urban NLOS environments; vehicles; Antenna measurements; Area measurement; Attenuation; Dipole antennas; Frequency measurement; Microwave bands; Microwave measurements; Microwave propagation; Performance evaluation; Road vehicles;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944872
