adding 5% white gaussian noise
22 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
atabak mostafavi
el 4 de Jul. de 2020
Comentada: atabak mostafavi
el 4 de Jul. de 2020
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
0 comentarios
Respuesta aceptada
Image Analyst
el 4 de Jul. de 2020
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;
3 comentarios
Image Analyst
el 4 de Jul. de 2020
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.
Más respuestas (0)
Ver también
Categorías
Más información sobre Propagation and Channel Models en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!