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//Chapter 24: Space Wave Propagation
//Example 24-12.1
clc;
//Variable Initialization
gain = 10 //Gain of transmitting antenna (dB)
P = 100 //Radiating power (W)
f = 1e6 //Frequency (Hz)
rx_gain = 15 //Gain of receiving antenna (dB)
d = 20e3 //Distance (m)
c = 3e8 //Speed of light (m/s)
v = 1000 //Scattering volume (m^3)
sigma = 0.1 //Effective scattering cross-section (m^2)
//Calculations
wl = c/f //Wavelength (m)
Pr_a = P*gain*rx_gain*(wl**2)/(4*%pi*(4*%pi*(d**2))) //Received power in case (a) (W)
F = (2*sqrt(sigma*v))/(d*sqrt(%pi)) //Attenuation Factor (unitless)
Pr_b = Pr_a*F //Received power in case (b) (W)
//Result
mprintf("The received power in case (a) is %.5f W", Pr_a)
mprintf("\nThe received power in case (b) is %e W", Pr_b)
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