Add random noise to electric field

[nsw1216]

Dear all,

I am new to noise generation. I would like to add a random noise to my signal but I failed to create the desired signal with noise.

What I did is just adding a random number to my signal but resulting signal seems like different from I want. It appears above of my original signal in magnitude instead of merge into mixed into my original signal.

May I know the correct way to add noise into a signal ?

Hope to get a reply from anyone who expert in it soon.

Thanks in advance.

Best Regards.

 

[jiripolivka]

Without any information about your frequency and power it is difficult to enter.
Noise can be generated in noise generators and added to a signal using a directional coupler. Noise can be also amplified to desired levels. You can check "www.noise.com" how they do it.

 

[nsw1216]

I am doing a simulation involving microwave antennas for image reconstruction. I would like to add white gaussian noise to my image in order to apply analog filter to filter out the noise.

However, I have to no idea on how to add the noise to my image.

Hope to get some ideas from fellow experts.

Thanks in advance.

Best Regards.