I don't have the words to describe the fact that between you and the person you replied to, just recommended a masters degree worth of textbooks to some strangers inconspicuous comment. I mean, if someone could read and understand all the textbooks you two listed, they could get a research level radar position.
It's safe to assume that this person, along the rest who clicked on the thread may already have an appropriate background, pursuing or have obtained a degree in EE/CS/Math, that will allow them to self study Signal Processing. Or at least are aware there's a lot more to AI than ChatGPT.
The math behind ML are of similar difficulty yet when there are thousands of grifters promising your average front-end wevdev AI expertise in N number of videos, no one bats an eye.
Unfortunately, the barrier to research level positions is much higher than simply having the capability of going through an arbitrary list of textbooks: a number of publications in large relevant conferences or journals, e.g. ICASSP, IEEE Transactions on Wireless Communications, is what will make you an attractive candidate for them.
