Mumbai University > Electronics Engineering > Sem4 > Fundamentals of Communication Engineering

Marks: 5M

Year: May 2015

1. The operation of the FDM is based on sharing the available bandwidth of a communication channel among the signals to be transmitted
2. That means many signals are transmitted simultaneously with each signal occupying a different frequency slot within a common bandwidth
3. Each signal is transmitted modulates a different carrier. The modulation can be AM, SSB, FM or PM
4. The modulated signals are then added together to form a composite signal which is transmitted over a signal channel.

Advantages

1. A large number of signals channels can be transmitted simultaneously

2. FDM does not need synchronization between its transmitter and receiver for proper operation

3. Demodulation of FDM is easy

4. Due to narrow band fading only a single channel gets affected

Disadvantages

1. The communication channel must have a very large bandwidth
2. Intermodulation distortion takes place
3. Large number of modulators and filters are required
4. FDM suffers from the problem of crosstalk’s
5. All the FDM channels get affected due to wideband fading

Applications

1. Used in telephonic systems
2. Am and FM radio broad casting
3. TV broad casting
4. First generation of cellular phones used in FDM