FDMA is nothing but Frequency Division Multiple Access), total available bandwidth of the channel(i.e common), which are divided into differnet bands as welll separed with guard bands. Every station already allocated with some band for sending data as well as uses a band pass filer for confine the all transmitter frequencies.
In TDMA(Time Division Multiple Access),the bandwidth is just one channel that is timeshared between different stations.Each station is allocated a time slot during which it can send data and each station transmits its data in is assigned time slot. | 
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