Add noise to multi-signals

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Chen
Chen on 2 Aug 2018
Edited: KALYAN ACHARJYA on 4 Aug 2018
I want to simulate a received signal which has three sins-wave signals at different frequencies with difference amplitudes and phases, say: (f(i), a(i), p(i)), i=1,2,3. The receiver has certain noise. The Rx noise compares with the received signal powers, we have SNR(i).
How do I model this signal in time-domain?
  1 Comment
KALYAN ACHARJYA
KALYAN ACHARJYA on 3 Aug 2018
%Here Sine signals, what you are expecting next?

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Answers (1)

KALYAN ACHARJYA
KALYAN ACHARJYA on 3 Aug 2018
%Change the paramerts as per requirements
t=0:.01:13;
noiseAmplitude=randi(5);
noise=noiseAmplitude* rand(1, length(t));
w1=3;w2=4;w3=5;
amp=6;
phase=30;
y1=amp*sin(w1*t+phase)+ noise;
plot(y1,'r','linewidth',1.5);
hold on;
y2=1.3*amp*sin(w2*t+phase+10)+noise;
plot(y2,'linewidth',1.5);
y3=1.5*amp*sin(w3*t+phase+20)+noise;
plot(y3,'g','linewidth',1.5);
hold off;
  2 Comments
KALYAN ACHARJYA
KALYAN ACHARJYA on 4 Aug 2018
For that you have to use some fixed value, I have used the random value
rand(1, length(t))
  • Just assign data (Not random)
  • find the SNR of the signal
  • Do the back calculation, how much data assign required to find the required SNR
I have answered it as per question at the heading.

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