FDMA (Frequency Division Multiple Access)

• Vary frequencies for each user.
• If number of users increases, it becomes complicated.

TDMA (Time Division Multiple Access)

• Using same frequency, divide into many time slots.
• Allocating different time slot for each user.
• They can speak only when their turns.

CDMA (Code Division Multiple Access)

• Each pair communicates in different languages.
• The mobile and base station are able to distinguish between signals transmitted simultaneously over the same frequency allocation.