Talk:Hata model for urban areas

Walfisch and Bertoni Model
A model developed by Walfisch and Bertoni [Wa]88] considers the impact of rooftops and building height by using diffraction to predict average signal strength at street level. The model considers the path loss, S, to be a product of three factors. S = Po Q2 P1 where P0 represents free space path loss between isotropic antennas given by

Po = (lambda / 4 pai R)2 (whole square) The factor Q2 gives the reduction in the rooftop signal due to the row of buildings which immediately shadow the receiver at street level. The P1 term is based upon diffraction and determines the signal loss from the rooftop to the street. In dB, the path loss is given by S(dB) =Lo+Lrts+Lms

where L0 represents free space loss, Lrts represents the "rooftop-to-street diffraction and scatter loss", and Lms denotes multiscreen thffiaction loss due to the rows of buildings [X1a92]. This model is being considered for use by ITU-R in the IMT-2000 standards activities. — Preceding unsigned comment added by Mapabhi1234 (talk • contribs) 13:52, 30 May 2011 (UTC)