Saturday, June 25, 2011

Data Traffic [matlab code]


clear all;
clc;
use=input('Enter the no. of users: ');
ts=input('Enter the no. of time slots: ');
on=0.35;
ton=zeros(use,ts);
n=ton;
for i=1:use
for j=1:ts
ton(i,:)=poissrnd((on*10),1,ts);
if (ton(i,j)>=3.5)
n(i,j)=1;
end
end
end
test=randint(use,ts,[1,1000]);
data=n;
for i=1:use
for j=1:ts
if n(i,j)==1
if test(i,j)>=1 & test(i,j)<=980
data(i,j)=64000;
elseif test(i,j)>980 & test(i,j)<=990
data(i,j)=128000;
elseif test(i,j)>990 & test(i,j)<=998
data(i,j)=256000;
else
data(i,j)=512000;
end
end
end
end
%timeslot vs bandwidth
d= sum(data);
figure(1);
bar(d);
xlabel('Time slot');
ylabel('Bandwidth(bps)');
%timeslot vs error rate
e=zeros(1,ts);
bm=1540000;
for i=1:ts
if d(i)>bm
e(i)=d(i)-bm;
end
end
figure(2);
bar(e);
xlabel('Timeslot');
ylabel('Error rate (bps)');
avg=sum(e')/ts;
ber=avg/bm;
buff=0;
disp('Average bit error rate without buffering');
disp(ber);
while (ber)>1e-6
buff=buff+10;
bm=bm+10;
for i=1:ts
if e(i)>0
e(i)=d(i)-bm;
end
end
s=sum(e');
ber=s/(ts*bm);
end
disp('Bit error rate with buffer');
disp(ber);
disp('Optimum buffer size');
disp(buff);

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