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the main difference is the access method.
CDMA stands for code division multiple access.
here, users share the same frequency band but in GSM, the users are associated to various frequency channels on which TDMA scheme is also used.
this scheme causes the modulation scheme to be different.
check this link:
hi.... unfortunately i couldnt download those files bcoz i dont have enough points, anyway i wanna ask u what are the hot research topics regaring CDMA? i will be more than happy if u could help me ...........
GSM is 2G mobile technology where TDMA and FDMA is utilized for simultanuous access of different mobile users, while CDMA is mobile communication system which is wideband and in this system each user signal is spread according to a specified code so that signals from each user can be separated at the receiver end.
This is just a basic different,, but there are number of other technical difference too....
The topic about CDMA you can search by Google, you can see the fundamental about it!
This is book for WCDMA:
W-CDMA and cdma2000 for 3G Mobile Networks
Author:M.R. Karim and M. Sarraf
Link:**broken link removed**
This is the useful book for everybody who wants to research about WCDMA!