In the era of telecommunication technology, speed, and economic factors become the main focus in the delivery of information. This is what initiated the scientists to create a telecommunications technology that is fast, inexpensive, and broad coverage. These developments began to appear with the 1G technology. After a time, 1G technology is considered start obsolete then comes the 2G technologies are divided into two types, the GSM and Code Division Multiple Access (CDMA) technology.

Code Division Multiple Access or is often abbreviated with CDMA is a multiplexing (not a modulation scheme) and a common access method that divides the channel is not based on time (as in TDMA) or frequency (as in FDMA), but a way of encoding data with a special code associated with each channel that exists and uses the constructive interference properties of the code-it's a special code to do the multiplexing. CDMA refers to digital cellular telephone system that uses a shared access scheme was initiated as QUALCOMM.