pathloss

lambda=0.3;
ht100=100;
ht30=30;
ht2=2;
hr=2;
axis=[];
p100=[];
p30=[];
p2=[];
pfs1=[];
for i=1000:5000
    d=10^(i/1000);
    axis=[axis d];
    fspower=(lambda/(4*3.1415*d))^2;
    power100=fspower*4*(sin(2*3.1415*hr*ht100/(lambda*d)))^2;
    power30=fspower*4*(sin(2*3.1415*hr*ht30/(lambda*d)))^2;
    power2=fspower*4*(sin(2*3.1415*hr*ht2/(lambda*d)))^2;
    p100=[p100,10*log10(power100)];
    p30=[p30,10*log10(power30)];
    p2=[p2,10*log10(power2)];
    pfs1=[pfs1,10*log10(fspower)];
end
text('FontSize',18);
semilogx(axis,p100,'g-',axis,p30,'b-',axis,p2,'r',axis,pfs1,'y-');
xlabel('distance in m');
ylabel('pathloss');
text(1000,-66,'blue: hr=30m');
text(1000,-74,'red: hr=2m');
text(1000,-58,'green: hr=100m');
text(1000,-50,'yellow:freespace');
text(50,-180,'lambda=0.30m');
text(50,-190,'hr=2m');