Effects of Temperature and Humidity on Radio Signal Strength in Outdoor Wireless Sensor Networks
Luomala, J., & Hakala, I. (2015). Effects of Temperature and Humidity on Radio Signal Strength in Outdoor Wireless Sensor Networks. In M. Ganzha, L. Maciaszek, & M. Paprzycki (Eds.), Proceedings of the 2015 Federated Conference on Computer Science and Information Systems (pp. 1247-1255). Annals of Computer Science and Information Systems, 5. IEEE. doi:10.15439/2015F241
Published inAnnals of Computer Science and Information Systems;5
© 2015 IEEE. This is a final draft version of an article whose final and definitive form has been published by IEEE. Published in this repository with the kind permission of the publisher.
Many wireless sensor networks operating outdoors are exposed to changing weather conditions, which may cause severe degradation in system performance. Therefore, it is essential to explore the factors affecting radio link quality in order to mitigate their impact and to adapt to varying conditions. In this paper, we study the effects of temperature and humidity on radio signal strength in outdoor wireless sensor networks. Experimental measurements were performed using Atmel ZigBit 2.4GHz wireless modules, both in summer and wintertime. We employed all the radio channels specified by IEEE 802.15.4 for 2.4GHz ISM frequency band with two transmit power levels. The results show that changes in weather conditions affect received signal strength. Of the studied weather variables, variation in signal strength can be best explained by the variation in temperature. We also show that frequency diversity can reduce the effects of channel-specific variation, and the difference between the transmit power levels. ...