Similar to GSM, CDMA (Code Division Multiple Access) is a digital network protocol used in 2G and 3G wireless mobile communications. CDMA is a form of multiplexing that permits several signals to occupy a single transmission channel, maximizing the utilization of available network bandwidth.
CDMA is based on spread spectrum technology.
CDMA networks stack digitalized calls on top of one another, assigning unique codes to distinguish them. Every piece of encoded call data is then transmitted at the same time.