FDMA (Frequency Division Multiple Access)

The oldest and simplest method for accommodating multiple simultaneous users in a band of radio frequency spectrum. FDMA means simply dividing the band into smaller bands.

While original analog (AMPS) mobile phone systems used only FDMA, modern digital systems use FDMA to separate groups of users, and some form of CDMA and/or TDMA to separate individual users within those groups.

Sharing is happiness: