% 信道容量與帶寬及信噪比的關系
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%
%
%
echo off
w=[1:5:20,25:20:100,130:50:300,400:100:1000,1250:250:5000,5500:500:10000];
pn0_db=[-20:1:30];
pn0=10.^(pn0_db/10);

for i=1:45
    for j=1:51
        c(i,j)=w(i)*log2(1+pn0(j)/w(i));
    end
end
echo on
pause
k=[0.9,0.8,0.5,0.6];
s=[-70,35];
surfl(w,pn0_db,c',s,k)

title('信道容量與帶寬及SNR的關系')