Jamal

2013-05-24 09:39:08 UTC

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Hi,Raw Message

I work on cooperative spectrum sensing for cognitive radio, energy detection;

I have this code there is somthing wrong which I can't find it

anyone can tell me whats wrong in this code

clc; clear all; close all;

u = 5;

sigma = 0:0.2:5;

snr = 20;

pf = gammainc(u,sigma/2)/gamma(u);

g=0;

h=0;

for p=0:(u-2)

gg = (1/factorial(p)) * (sigma./2).^p;

g = g + gg;

hh = (1/factorial(p)) * ((sigma.*snr)/(2*(1+snr))).^p;

h = h + hh;

end

pd = exp(-(sigma/2)) .* g + ((1+snr)./snr)^(u-1) .*(exp(-(sigma./(2+(1+snr)))) - exp(-(sigma/2)) .* h);

pm = 1 - pd;

loglog(pf,pm)

xlabel('Pf: Probability of Fals alarm');

ylabel('Pm: Probability of missed detection');

legend('20 dB');

grid on