What are the basic differences between FDMA, TDMA, and CDMA?

FDMA (Frequency Division Multiple Access): Divides the spectrum into frequency channels; each user gets a dedicated frequency band. TDMA (Time Division Multiple Access): Users share the same frequency but are assigned different time slots in a repeating frame. CDMA (Code Division Multiple Access): All users share the same frequency and time but are separated by unique spreading codes. FDMA is simple but inefficient; TDMA improves efficiency by time-sharing; CDMA provides soft capacity and better resistance to interference but requires power control.