Browse the site http://www.cdg.org/ to learn more about CDMA
If you want to learn about GSM, which is the TDMA wireless standard that is the main competition to CDMA, see http://ccnga.uwaterloo.ca/~jscouria/GSM/trio.html
Other links are available at http://www.eg.bucknell.edu/~kozick/elec470/links.html