How to acquire physical noise samples I need to obtain some real (simulated) data to indicate noise in communication system.

How do I go about it? I need it for my thesis.

I don't know if denoising a set of signals will help so I can have the noise data samples.

I  just need the noise data samples.
One easy way to grab a set of samples of physical noise is by acquring a cheap SDR, such as an RTL, tuning it to an empty band, and just reading and saving the samples. This should give a you a nice set of mostly white noise samples.