Abstract
Line-of-sight (LOS) attenuation at 7.2GHz was measured in Lagos (6 o 26N, 3 o 52E) for twelve months (Aug ‘08-July'09) using one of the Nigerian Telecommunications radio signal. The measurement was carried out with the intent of highlighting microwave signal attenuation in Harmattan and rain weather conditions. The results are presented in terms of mean signal level, received signal level and fog attenuation, rain attenuation, multipath fading, free space loss and link availability. The observed attenuation values due to Harmattan (fog) and rain attenuation was calculated (using Altshuler's model). Also, the statistics of fade distribution show fast fading of longer duration of the order of 16 to 39 fades per hour during this period (Harmattan) and 24 to 48 fades per hour during the period of rain. This shows that microwave LOS link in this region and regions with similar climatic characteristics are prone to signal degradation as well as fading in the Harmattan and rain season.
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