What is Frequency division multiplexing ?

What is Frequency division multiplexing ?

Frequency division multiplexing (FDM): 

• An analog technique that can be applied when BW of the link is greater than the combined BW of the signals to be TX 
• Signals generated by each sending device modulate difference carrier frequencies 
• These modulated signals are then combined into a single Composite signal that can be transported by the link 
• Carrier frequencies are separated by enough BW to accommodate the modulated signal 
• These BW ranges are the channels through which the various signals travel