FDMA, TDMA and CDMA

FDMA: Frequency Division Multiple Access is a type of channelization protocol. This bandwidth is divided into various frequency bands. Each station is allocated with the band to send data and that band is reserved for the particular station all the time.

TDMA: Time Division Multiple Access is the channelization protocol in which the bandwidth of the channel is divided into various stations on a time basis. There is a time slot given to each station, the station can transmit data during that time slot only.

CDMA: In Code Division Multiple Access, all the stations can transmit data simultaneously. It allows each station to transmit data over the entire frequency all the time. Multiple simultaneous transmissions are separated by unique code sequences. Each user is assigned a unique code sequence.