Frequency Division Multiplexing (FDM) is a form of signal multiplexing where multiple signals are modulated on different carrier frequencies and modulated signals are added together to create a composite signal. Frequency division multiplexing divides the total bandwidth available to a system into different frequency sub-bands, each of which is assigned to different signals. It prevents interference between signals because input signals are assigned to different frequencies. Figure 1 shows the spectrum of multiplexed signal at the output of transmitter.

Figure 1: Spectrum of multiplexed output

The FlexTrainer can be used to demonstrate frequency division multiplexing with amplitude modulation. In this experiment, you will be able to amplitude modulate two input signals by selecting two different carrier frequencies and modulation indices.

The questions at the end of this experiment encourage students to investigate important features related to frequency division multiplexing and its frequency domain representation