Code Division Multiple Access (CDMA) is a multiple access technology whereby a number of users share the same frequency channel at the same time. Each user is assigned a unique code.
CDMA is a so-called “spread-spectrum technique” because the data signal is spread over a larger bandwidth than strictly needed to transmit it.
CDMA is used in a number of mobile communications systems. The second generation standard cdmaOne as well as the 3rd generation standards CDMA2000 and UMTS use CDMA.