Synchronization Technique Used in Analog FDM

 Frequency division multiplexing (FDM) is an analog modulation technique that combines analog signals. In FDM several frequencies bandwidths are carried through a single line. Then it is transmitted to the receiver. In this case, in FDM we use guard bands within two bandwidths. Using guard band is a technique that use in FDM for synchronization. We can see it in this figure.

 

When we transmit these 10 kHz bandwidths (signals) to receiver without guard (5 kHz) bands, the receiver cant identity what is the 1^st, 2^nd, 3^rd signal. It hasn’t any understand about the bandwidth of the signal.

               We can see in this figure, if we use a guard band between them the receiver can identify the signals. It can know the bandwidth of the signal.

               That’s how synchronization technique used in analog FDM.

Throughout this article I hope you may get some thing. This provides very basic explanation and future will cover more. Comments are well come. Thank you.