what is the Matlab code for Duobinary Encoding and Decoding?

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Virupaksha
Virupaksha 2014-12-27
回答： Krishna Lankipalli 2021-9-23
function [c,b_r]=Duobinary_EncDec(b)
% Precoded Duobinary coder and decoder
% b = input binary sequence:precoder input
% c = duobinary coder output
%b_r = duobinary decoder output
a(1) = xor(1,b(1));
if(a(1)==1)
a_volts(1) = 1;
end
for k =2:length(b)
a(k) = xor(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:')
endfunction
  1 个评论
Geoff Hayes
Geoff Hayes 2014-12-27
What exactly is your question, as you have seemed to have answered it by posting some MATLAB code to do the encoding and decoding....?

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回答（1 个）

Krishna Lankipalli
Krishna Lankipalli 2021-9-23
function [c,b_r]=Duobinary_EncDec(b)
% Precoded Duobinary coder and decoder
% b = input binary sequence:precoder input
% c = duobinary coder output
%b_r = duobinary decoder output
a(1) = xor(1,b(1));
if(a(1)==1)
a_volts(1) = 1;
end
for k =2:length(b)
a(k) = xor(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:')
endfunction

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