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what does if(s(j+1)==y1(j+1)) mean?

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ainun syafiqah
ainun syafiqah on 12 Jan 2021
Answered: SaiDileep Kola on 15 Jan 2021
%Demodulation process
for i=1:6
for j=(i-1)*100:i*100
if(s(j+1)==y1(j+1))
x(j+1)=1;
else
x(j+1)=0;
end
end
end
%plot ASK Demodulated Signal
subplot(4,1,4);
plot(
t,x,'r');
title('ASK Demodulated Signal');
xlabel('time(s)');
ylabel('amplitude');
  3 Comments
dpb
dpb on 12 Jan 2021
"can i also know what type of demodulation is this?"
Dunno...what's a Modulated ASK signal?
Looks like the whole double loop could be dispensed with as
i1=1;
i2=601;
x=double(s(i1:i2)==y1(i1:i2));

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Answers (1)

SaiDileep Kola
SaiDileep Kola on 15 Jan 2021
Ask modulation is simply multiplying data sequence(0,1) with a continuous wave, so you get signal at places of 1's and get no signal at 0's, the reverse is done at demodulation to check if the signal is present and assign as 1 and others as 0.

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