Hi Supe,
A BTS is a telecom equipment that allows to send and receive data between mobile stations / antennas, and communicate with the BSC.
CDMA is a telecom protocol, and as such, it is comparable to GSM or GPRS. (however those protocols are different in the way they work or regarding what they offer)
IMO, you should buy a book talking about telecoms fundamentals, because you’re starting from scratch here…