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Replies: 49   Last Post: Mar 4, 2016 2:43 AM

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 amit Posts: 2 Registered: 11/21/12
Posted: Nov 21, 2012 10:05 AM

hi, im also stuck on my matlab code for cognitive radio, it doesnt seem to work. i need graphs for pf vs pd and then introduce noise later on. my code so far is:
Could really do with some help and pointers. thanks!
amit703@hotmail.com

%monte carlo simulation
function [y1,y2,y3,y4]= ed(SNRL,SNRS,SNRH,n) %ed is the energy detection
g1= SNRL:SNRS:SNRH;
g=10.^(g1/10);
beta=0.01; % is the probability of flase alarm

pf1=zeros(1,length(g));
pd1=zeros(1,length(g));
pf2=zeros(1,length(g));
pd2=zeros(1,length(g));

for i=1 : length(g)
y0 = randn(n,1000000);
y1= randn(n,1000000)*sqrt(g(i))+y0;

Tgam = gaminv(1-beta,n/2,2/n*(1+g(i))); %threshold
pf1(i)= gamcdf(Tgam,n/2,2/n*(1+g(i)))
pd1 (i) = gamcdf(Tgam,n/2,2/n); % prob of detection
pf2(i)= length (find(sum(y1.^2)/n<Tgam))/1000000;
pd2 (i) = length (find(sum(y0.^2)/n<Tgam))/1000000;

end
y1=pf1; y2=pd1; y3=pf2; y4=pd2;

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