CDMA is one of many technologies for digital transmission of radio signals between, for example, mobile telephones and radio base stations. In CDMA, which is a spread-spectrum modulation technology, each call is assigned a unique “pseudorandom” sequence of frequency shifts that serve as a code to distinguish it. The mobile phone is then instructed to decipher only a particular code to pluck, as it were, the right conversation off the air.
CDMA (Code-Division Multiple Access) refers to any of several protocols used in so-called second-generation (2G) and third-generation (3G) wireless communications. As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth. The technology is used in ultra-high-frequency (UHF) cellular telephone systems in the 800-MHz and 1.9-GHz bands.