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//clear//
//Caption:Duobinary Encoding
//Example6.2: Precoded Duobinary coder and decoder
//Page 256
clc;
b = [0,0,1,0,1,1,0];//input binary sequence:precoder input
a(1) = bitxor(1,b(1));
if(a(1)==1)
a_volts(1) = 1;
end
for k =2:length(b)
a(k) = bitxor(a(k-1),b(k));
if(a(k)==1)
a_volts(k)=1;
else
a_volts(k)=-1;
end
end
a = a';
a_volts = a_volts';
disp(a,'Precoder output in binary form:')
disp(a_volts,'Precoder output in volts:')
//Duobinary coder output in volts
c(1) = 1+ a_volts(1);
for k =2:length(a)
c(k) = a_volts(k-1)+a_volts(k);
end
c = c';
disp(c,'Duobinary coder output in volts:')
//Duobinary decoder output by applying decision rule
for k =1:length(c)
if(abs(c(k))>1)
b_r(k) = 0;
else
b_r(k) = 1;
end
end
b_r = b_r';
disp(b_r,'Recovered original sequence at detector oupupt:')
//Result
//Precoder output in binary form:
//
// 1. 1. 0. 0. 1. 0. 0.
//
// Precoder output in volts:
//
// 1. 1. - 1. - 1. 1. - 1. - 1.
//
// Duobinary coder output in volts:
//
// 2. 2. 0. - 2. 0. 0. - 2.
//
// Recovered original sequence at detector oupupt:
//
// 0. 0. 1. 0. 1. 1. 0.
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