Answer Happy

Problem 1: The Hata model is an empirical formulation of the graphical path loss data provided by Okumura and is valid over roughly the same range of frequencies. 150-1500 MHz. The standard formula for empirical path loss in urban areas under the Hata model is Purtan(d)dB = 69.55 +26.1610610 () - 13.82 1050 (he) - (Ar) + (44.9 - 6,55 logo(he)) log:old). a(he) is a correction factor for the mobile antenna height based on the size of the coverage area For small to medium-sized cities, this factor is given by a(hr) = (1.1 logo(f) - 7))--(1.56 logo(2) - 8) dB, and for larger cities at frequencies fe> 300 MHz by a(h) = 3.2(108_o(11.75)) - 4.97 dB. Corrections to the urban model are made for suburban and rural propagation, so that these models are (respectively) Pesuburbund) dB = Purban(d) dB - 21080 S./28) -- 5.4 PL.mural(d) dB = Puhun (dl) dB - 4.78[log10 (S.)] +18.33 logo(s) - K where K ranges from 35.94 (countryside) to 40.94 (desert). Given that the carrier frequency is 900 MHz, ht=20 m, hr=5 m, and d = 100 m, a) Find the median path loss under the Hata model for: • a large urban city • a small urban city • a suburb • a rural area (find the range of pathloss based on the range of K) b) Explain qualitatively the path loss differences for these four environments.