If the received power at a reference distance d0 = I km is equal to 1 micro-watt, find the received powers at distances of 2 km, 5 km, 10 km, and 20 km from the same transmitter for the following path loss models: 

(a) Free space;

(b) n = 3; I

c) n = 4; 

(d) 2-ray ground reflection using the exact expression; 

(e) extended Hata model. 

Assume f=1800 MHz, = 40m, hr = 3m, Q = = dB. 

Plot each of these models on the same graph over the range of 1 km to 20 km.