Prediction of LOS based Path-Loss in Urban Wireless Sensor Network Environments

In this paper, to model the path-loss characteristics in urban line-ofsight(LOS) propagation, we performed measurements in Goyang, Republic of Korea, at a frequency of 2.4GHz using the IEEE 802.15.4 standard. Although path-loss variance for any street existed, measurements yielded a typical pathloss of PL(dB) = L r    ) ( log 10 10  , where  is the path-loss coefficient, r is the street length, and L is the additional loss incurred at the streets. The pathloss coefficient was measured with a variation of 7 . 3 5 . 2    in experiments. This measurement will be useful for the estimation of the shadowing area that appears in urban environments, and is motivated by its potential in determining efficient placement strategies for urban coverage.