adding 5% white gaussian noise
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Hi everyone;
I need to add 5% noise to my signal (amplitude of noise = 0.05* signal amplitude) using "randn" as:
signal_noisy=signal+0.5*randn(signal) % (is it correct?)
is the genereated noise, whight gussion one?!
if I want to use "awgn" is it correct to say in this case SNR=13 ???
I realy appriciate your help here
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Image Analyst
2020년 7월 4일
Try this:
% Make sample data.
x = linspace(0, 3*pi, 640);
period = 2*pi;
y = cos(2 * pi * x / period); % Noise-free signal.
% Noise is 5% of the signal value at each location,
% which means sigma is not a constant at each location.
amplitudes = y * 0.05;
noise = amplitudes .* randn(1, length(y));
% Add the noise to the noise-free signal.
yNoisy = y + noise;
% Plot everything.
plot(x, yNoisy, 'r.', 'MarkerSize', 8);
hold on;
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
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Image Analyst
2020년 7월 4일
Yes, it's flat. The noise depends only on the signal and there is no spatial or time dependency on it, other than the signal itself of course.
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