error in matlab code
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i want to add noise just in a part of signal
3 个评论
houssem alimi
2019-3-14
KSSV
2019-3-14
for t=0.4:0.01:0.5
x(t)=y+awgn(y(t,5);
end
The above code is not correct.......you need to rethink on it.
houssem alimi
2019-3-14
回答（1 个）
KALYAN ACHARJYA
2019-3-14
编辑：KALYAN ACHARJYA
2019-3-14
Replace the complete for loop by following line
x=y+awgn(y,10); % Here 10 represents SNR, change accordingly
No need of for loop for adding noise, awgn represents white Gaussian Noise
A1=1;A2=1; %amplitude of the signal
f1=1;f2=3; %frequency sinusoidal signal
Fs=100; %sampling rate
Ts=1/Fs; %sampling period
fi=0; %phase shift
t=0:Ts:1; %time vector
y=A1*sin(2*pi*f1*t+fi)+A2*sin(2*pi*f2*t+fi); %generated signal
subplot(121), plot(t(1:100),y(1:100),'k','LineWidth',2),grid on
axis([0 1 -Inf Inf])
title('Addition deterministic and random signal','FontWeight','Bold','FontSize',14)
xlabel('time t(second)','FontWeight','normal','FontSize',12)
ylabel('amplitude u(volt)','FontWeight','normal','FontSize',12)
x=y+awgn(y,10);
subplot(122),plot(t,x,'k','LineWidth',2),grid on
axis([0 1 -Inf Inf])
I didnot check the logic of the code. Hope it clered your error doubt.
The Reason of error, you use the for loop
for t=0.4:0.01:0.5
x(t)=.....,
which means x(0.4) is not allowed, array indxing should always in positive integer x(1), x(2)........
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2019-3-14
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2021-8-20
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