I'm trying to help you to help yourself. People aren't just going to hand you things in life, so it's best you learn that early on.
One has to wonder why you came here looking for help on your homework. Presumably you have a book, and someone is teaching this class are they not? Both of which are right there. So, if not for reasons that would qualify as academic dishonesty, why would you come here asking for the answer to homework questions?
I'll admit that my EE and CprE skills aren't quite up to snuff of knowing a detailed definition of a digital signal. Doesn't change the fact that your asking for the answer here is essentially soliciting plagiarism. You're looking to pass off someone else's work as your own. Expulsion would be the best you could hope for if caught. If you flunk out, you can always try again. If you're expelled for academic dishonesty, you'll be blackballed across the nation at accredited universities, and a degree from an unaccredited school isn't worth the paper its printed on in the real world unless you're looking into becoming a priest.