hi there,

My issue is as follows: consider I have a low-pass filtered version of

a white noise signal (fc00 Hz, LPF) as my signal. I would like to add

different Gaussian white noise having different SNR referred to the LPF

signal. I do the following.

1. I get the power of the signal using = mean(original_signal.^2) ->

{say P_s}

2. standard deviation of the required noise = sqrt(P_s / SNR) ->

{noi_std}

3. construct noise using noise_trace = noi_std.*randn(1000,1)

Now the question is, in step 1 when I am computing the power of the

signal do I use the orginal signal or the original signal with the mean

removed ?

Thanks, BSG