The most important application of FDM (frequency division multiplexing)  is broadcasting, telephone communications. In this article, you will find a lot of pros and cons of FDM to better understand this topic. 
Advantages of FDM:
Advantages of FDM:
- It does not need synchronization between its transmitter as well as receiver
 - FDM is simpler and easy demodulation
 - Less expensive
 - FDM system does not need synchronization but TDM needs synchronization. It is an advantage of FDM over TDM
 - FDM provides more latency than TDM
 - Using FDM system multimedia data can be transferred with very high efficiency and low noise and distortion
 - FDM system has high reliability
 - It is used for analogue signals
 - In this system due to slow narrowband fading, only one channel gets affected
 - A large number of the signal can be transmitted simultaneously
 
Disadvantages of  FDM:
- It is suffering the problem of cross talk
 - FDM is only used only when a few low-speed channels are desired
 - Intermodulation distortion takes place
 - The circuitry for FDM is complex than TDM
 - FDM requires more hardware than TDM
 - FDM system extremely expensive
 - FDM provides less throughput
 - FDM has not dynamic coordination
 - The full bandwidth of the channel cannot be used on the FDM system
 - The communication must have very large bandwidth
 - A large number of modulator and filter required
 - FDM channel can get affected wideband fading
 - FDM system needs a carrier wave or carrier signal but TDM does not need carrier signal
 
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