Code Division Multiple Access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (channels) without interference.
CDMA is used as the access method in many mobile phone standards including IS-95, W-CDMA, and CDMA2000. It is also used in some satellite communication systems such as the Iridium system and Globalstar system. CDMA has been shown to provide better capacity for voice and data communications than other multiple access schemes such as time division multiple access (TDMA).
There are two types of CDMA systems: direct sequence CDMA (DS-CDMA) and frequency-hopped CDNA (FH-CDNA). In DS-CDAM, each user’s signal is spread across the entire frequency band using a pseudorandom noise code. This makes it difficult for an eavesdropper to intercept or jam the signal from a specific user.
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