Title :
Very near ground RF propagation measurements for wireless systems
Author :
Welch, Thad B. ; Wood, John N. ; McParlin, R.W. ; Schulze, Logan K. ; Flaherty, Tom P. ; Carlone Hanson, S.G. ; Cahill, Ralph J. ; Foran, Ray A.
Author_Institution :
Dept. of Electr. Eng., US Naval Acad., Annapolis, MD, USA
Abstract :
Using a forward control channel of two different base stations as the signal source, we measure the effects associated with placing a cellular/PCS handheld transceiver very near the ground. A significant decrease in signal strength occurs when a system user drops from a standing to a lying position. As much as a 10.9 dB decrease in signal strength can result. This effect occurs with either a weak or strong specular signal component. Additionally, when a strong specular signal component, the shadowing caused by the system user´s head is small compared to the variations caused by antenna elevation
Keywords :
Rician channels; UHF radio propagation; cellular radio; emergency services; field strength measurement; personal communication networks; radiowave propagation; 450 m; 879.63 MHz; Rician K factor; UHF; antenna elevation; base stations; cellular/PCS handheld transceiver; emergency services; field pattern; forward control channel; head; lying position; shadowing; signal source; signal strength; standing position; strong specular signal component; very near ground RF propagation measurements; weak specular signal component; wireless systems; Antenna accessories; Base stations; Emergency services; FCC; Personal communication networks; Radio frequency; Rician channels; Shadow mapping; Telephony; Transceivers;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851734
