Title :
Multipath measurements over obstructed radio transmission paths
Author :
Ahmed, M. Jantil ; Garrison, G. Jack ; Gosse, W.
Author_Institution :
MPR Teltech, Burnaby, BC, Canada
Abstract :
To provide PSTN to isolated subscribers BC TEL employs Exchange Area Radio telephone Service (EARS) in the 409 MHz/420 MHz UHF band. Usually LOS communication is not possible, and repeaters are used. To determine if diversity techniques could be used to improve performance and eliminate the use of repeaters, a measurement program was undertaken. The two-channel measurement system to detect and only record propagation fades in mountainous area over an obstructed LOS path is described. The fading results are presented, and the mechanisms for fading are explained. The PDF and CDF of the measured signals are compared with Rayleigh distributions, and the performance improvement that can be realized is given. Finally, a suitable diversity technique is identified
Keywords :
diversity reception; fading; measurement systems; mobile radio systems; probability; radio stations; radiotelephony; radiowave propagation; telecommunication channels; 409 MHz; 420 MHz; BC TEL; CDF; EARS; Exchange Area Radio telephone Service; LOS communication; PDF; PSTN; Rayleigh distributions; UHF band; diversity technique; fading; measured signals; mobile radio; mountainous area; multipath measurements; obstructed LOS path; obstructed radio transmission paths; performance improvement; propagation fades; repeaters; two-channel measurement system; Circuits; Ear; Fading; Geometry; Radio link; Rayleigh channels; Repeaters; Scattering; Telephony; UHF measurements;
Conference_Titel :
Electrical and Computer Engineering, 1993. Canadian Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-2416-1
DOI :
10.1109/CCECE.1993.332187
