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How can I add gaussian noise in a specific percentage (e.g. add 5% gaussian noise to a signal)?

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Pedro Alejandro Garza Juarez 2017-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/336004-how-can-i-add-gaussian-noise-in-a-specific-percentage-e-g-add-5-gaussian-noise-to-a-signal

评论： Jubeyer Rahman 2020-4-7

采纳的回答： Image Analyst

I have a regular signal in a vector, I want to add 5% gaussian noise to it, anyone got ideas? Thanks

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Pedro Alejandro Garza Juarez 2017-4-19

It's 5% uncorrelated Gaussian random noise.

Image Analyst 2017-4-19

So, did my code below do what you want? If not, what do you want?

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Image Analyst 2017-4-18

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Try this:

period = 20;
t = linspace(-20, 20, 500);
signal = 10*sin(2 * pi * t / period);
noiseSigma = 0.05 * signal;
noise = noiseSigma .* randn(1, length(signal));
noisySignal = signal + noise;
plot(t, noisySignal, 'r.', 'MarkerSize', 10);
hold on;
plot(t, signal, 'b-', 'LineWidth', 3);
grid on;

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kasimala venkatanagaraju 2019-4-6

sir, I want to generate noise contaminated signal with zero mean and standard deviation of 2%. Can you help me how to generate it.

Jubeyer Rahman 2020-4-7

Shouldn't be there be an sqrt before sigmanoise?

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