error in matlab code

Question

houssem alimi 2019-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/450052-error-in-matlab-code

关闭： MATLAB Answer Bot 2021-8-20

randomsig.m

i want to add noise just in a part of signal

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KSSV 2019-3-14

在 MATLAB Online 中打开

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

my goal is to add noise in a part of signal between t1 and t2

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Answer 1

KALYAN ACHARJYA 2019-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/450052-error-in-matlab-code#answer_365352

编辑：KALYAN ACHARJYA 2019-3-14

在 MATLAB Online 中打开

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])