%Problem 3.30;
%Attenuation of the received power with distance;

clear all; close all;
r=[2 3 3.84 4]; %power of distance in a propagation model;
x=[1:0.1:5]; %lg of distance;
y=-10*r'*x; %received power in dB;
semilogx(10.^x,y); xlabel('D/D_{0}'); ylabel('P_{r}/P_{r0}, dB'); grid; %plotting received power versus distance;
legend('r=2','r=3','r=3.84','r=4');