There are so many factors to consider before thinking about putting carpet into a basement. The main issue is moisture. You have to ask yourself when this pad was poured did they put a vapor barrier underneath?
A good test is to tape down an 18inch by 18 inch piece of plastic in your basement and let it sit for 24 hours. If you find moisture or a darkened concrete under the plastic, then that means that there wasn’t a moisture barrier in place and you will have to build one before you lay your carpeting.