How To Make Noise Signal After Estimate Noise Variance

Question

For Blind Source Separation (Adapative Filtering , LMS Algorithm), i need two input. a)noisy signal, 2)noise signal. But How can i make the noise signal. If i can estimate the noise variance of noisy signal, then how can i make a noise signal from noise variance in matlab. I am new in signal processing.

Answer 1

try this (matlab):

noise = normrnd(mean ,sqrt(variance) ,rows ,columns);

it will generate random numbers from the normal distribution (mean,variance). rows and columns will dictate the result matrix dimensions.