An introduction to the WCDMA techniques to be used in third-generation (3G) cell phones.
http://www.iec.org/online/tutorials/wcdma/
Focuses on the CDMA standard used in cellular phones, rather than on CDMA concepts in general. Gives good background on spread spectrum.
http://www.bee.net/mhendry/vrml/library/cdma/cdma.htm
Discusses FDMA and TDMA too.
http://www.umtsworld.com/technology/cdmabasics.htm
Discusses FDMA and TDMA too.
http://www.tsp.ece.mcgill.ca/Telecom/Docs/cdma.html