Title :
Seasonal variability of a local multi-point distribution service radio channel
Author :
Papazian, Peter ; Lo, Yeh
Author_Institution :
Inst. for Telecommun. Sci., Nat. Telecommun. Inf. Adm., Boulder, CO, USA
Abstract :
This paper investigates the seasonal variability of an LMDS radio channel obscured by vegetation. A 1-km, 28.8 GHz radio link was established and monitored during spring and fall seasonal changes. The radio path was obscured by two deciduous trees but had more then two Fresnel zones of clearance over the roof of an adjacent building. Seasonal signal variability was caused by the presence or absence of leaves, which obscured the radio path. Averages of received power are presented to determine attenuation and seasonal variability. Attenuation caused by the trees is 16-18 dB with no leaves present and 26-28 dB with leaves present
Keywords :
attenuation measurement; electromagnetic wave absorption; meteorology; microwave propagation; radio access networks; radio broadcasting; telecommunication channels; 1 km; 16 to 18 dB; 26 to 28 dB; 28.8 GHz; Fresnel zones of clearance; LMDS broadcasting systems; LMDS radio channel; SHF; average received power; deciduous trees; fall; leaves; local multi-point distribution service radio channel; radio link; radio path; seasonal signal variability; seasonal variability; signal attenuation; spring; Attenuation; Band pass filters; Frequency synthesizers; Local oscillators; Monitoring; Radio link; Radio transmitters; Receivers; Springs; Vegetation;
Conference_Titel :
Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5454-0
DOI :
10.1109/RAWCON.1999.810967