期刊名称：International Journal of Advanced Computer Science and Applications(IJACSA)
印刷版ISSN：2158-107X
电子版ISSN：2156-5570
出版年度：2019
卷号：10
期号：10
页码：219-225
出版社：Science and Information Society (SAI)
摘要：Countries with tropical climates experience various
weather changes throughout the year. The weather can
drastically change from extremely hot and humid to a complete
downpour in a twenty-four-hour cycle. Different atmospheric
conditions such as atmospheric gas attenuation, cloud
attenuation, and rain attenuation can cause interruption of
electromagnetic signals and weaken the radio signals. The
amount of attenuation is mostly depending on the raindrops.
Rate of attenuation by rain depends on the composition,
temperature, orientation, shape and fall velocity of raindrops. In
this paper, we measure the effect of different atmospheric
attenuations, particularly due to rain for non-line-of-sight
environments and proposed a LoRa (Long Range) based wireless
mesh network to enhance packet delivery ratio (PDR). We
experimented with the LoRa based wireless network by taking
the packet delivery ratio at different times of the day when there
was no rain and performed some experiments while raining. The
experiments conclude that PDR is affected by different volumes
of rain where PDR decreases significantly from 100% when it
was not raining and decreases to 89.5% when it rains. The results
also show that the LoRa device can successfully transmit up to
1.7km in a line-of-sight environment and around 1.3km in a nonline-of-sight
environment without rain. The results show the
effect of atmospheric attenuation to LoRa wireless network and
become a consideration factor when designing any LoRa
applications for outdoor deployment.
