Abstract
Two-year experimental research results of radio signal propagation and fading are presented in this paper. Microwave wireless links located in coastal and continental terrain and operated at 15 GHz were tested. The impacts of different atmosphere phenomena such as rain, brume, dew, weather, ground and dew point temperatures on the signal strength fading in these wireless links were assessed. Additionally, multipath effect origin and rain attenuation were analysed. DOI: http://dx.doi.org/10.5755/j01.eee.20.4.2921
Highlights
The availability of fixed broadband wireless networks significantly depends on atmosphere conditions
Having the graph of signal strength level and statistical distributions of separate atmospheric parameters one can define what conditions have an ultimate impact on signal fading or multipath propagation
It is noticed that the multipath propagation of radio waves in atmosphere is related with the rising dew frequently in the early morning time of the day during warm seasons of the year
Summary
The availability of fixed broadband wireless networks significantly depends on atmosphere conditions. ITU-R recommendations of P.530-x series give prediction methods required for design of terrestrial radio links It is indicated how very important is to evaluate real atmosphere characteristics of geographic terrains where the designed radio links should be installed. Results of practical observations of multipath propagation in different places of Latvia at link frequencies of 7 GHz– 8 GHz were presented in [3]. Research of seasonal rain attenuation and radio waves fading in LOS links at 19.5 GHz on South Africa terrain are presented in [5]. This work is about signal strength fading in the medium distance broadband LOS wireless links operated at 15 GHz frequencies. Of interest, is to contrast radio wave propagation conditions in different seasons of the year in different Lithuanian terrains attributed to multipath propagation phenomena of radio waves higher than 10 GHz
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