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

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ainun syafiqah
ainun syafiqah 2021-1-12
回答： SaiDileep Kola 2021-1-15
%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');
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ainun syafiqah
ainun syafiqah 2021-1-12
can i also know what type of demodulation is this?
dpb
dpb 2021-1-12
编辑：dpb 2021-1-12
"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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回答（1 个）

SaiDileep Kola
SaiDileep Kola 2021-1-15
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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