CDMA digital systems get their name, Code Division Multiple Access, by assigning a unique code to each user and by spreading the transmission of all users in parallel across a wide band of frequencies. In the TIA-95 implementation of CDMA, the bandwidth of a single channel is 1.25 MHz, which is claimed to support 10 to 20 times as many users as the equivalent spectrum dedicated to analog cellular.
The TIA-95 CDMA digital cellular standard is described, from a network perspective, in the February, 1996 and March, 1996 issues of Cellular Networking Perspectives. An update on the TIA/EIA-95 standards known as cdma2000 or IS-2000 was given in our January, 2001 issue.
Updates on the progress of CDMA standards development by TIA TR-45.5 and 3GPP2 TSG-C are given in our May and November issues.