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FDM | TDM |
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Signals which are to be multiplexed are added in the time domain. But they occupy diff slots in the frequency. domain | The signals which are to be multiplexed can occupy the entire bandwidth but are isolated in the time domain |
FDM is usually preferred for the analog signals. | TDM is preferred for the digital signals. |
Synchronization is not required. | Synchronization required |
The FDM requires a complex circuiting at the transmitter and receiver. | TDM circuiting is not very complex. |
FDM suffers from the problem of crosstalk due to imperfect band filters. | In TDM the problem of crosstalk is not severe. |
Due to wideband fading in transmission medium, all FDM channels are affected | Due to fading only a few TDM channels will be affected |
Due to slow narrowband fading taking place in the transmission channel only a single channel may be affected in FDM | Due to slow narrow band fading all the TDM channels may get wiped out. |
Applications: