There are three common technologies used by mobile phone networks for transmitting information:
A. Frequency Division Multiple Access (FDMA)
B. Time Multiple Division Access (TDMA)
C. Code Division Multiple Access (CDMA)
A. Frequency Division Multiple Access (FDMA)
To understand FDMA, could be analogous on radio stations, radio stations transmit signals at different frequencies on the channel available to every mobile phone user. FDMA is used mainly for analog transmission. Time for carrying digital information, FDMA is no longer efficient.
B. Time Multiple Division Access (TDMA)
The use of frequency channels using a time limit. Sound enters the channel / channel into a compressed digital format and has a small size. It has a capacity of TDMA capacity calls broader than analog models in FDMA. TDMA operates at a frequency of 800 MHz or 1900 MHz.
Same TDMA to GSM. TDMA technology is sometimes referred to as the Global System for Mobile Communication (GSM). GSM uses encryption to use so that more safety. GSM operates in the 900 - 1800 MHz. Users simply use the GSM SIM (subscriber identification mobile).
C. Code Division Multiple Access (CDMA)
A mobile phone sends the data (voice) enters the channel / channel and will be broken up into small pieces and drain into separate frequencies, then data packets that are small will be deployed with a unique code and only acceptable to the recipient who has the suitability of the data to be retrieved.
