Calculate the system bandwidth capacity in a FDM system having 200 users with individual BW of 3MHz.

Concept:

In FDM, the total bandwidth is divided into a set of frequency bands that do not overlap. Each of these bands is a carrier of a different signal that is generated and modulated by one of the sending devices. The frequency bands are separated from one another by strips of unused frequencies called the guard bands, to prevent overlapping of signals.

Let, there is n number of signals that have been multiplexed.

Each signal has individual bandwidth B and there is a Guard band (G.B) between the adjacent signals.

Total Bandwidth required (BW) = nB + (n-1)GB

Calculation:

GIven;

n = 200

B = 3MHz

Consider the guard band to be zero by default as it is not mentioned.

BW = nB + (n - 1)GB = 200 × 3 = 600 MHz

Additional Information

•  FDM allows sharing of a single transmission medium like a copper cable or a fiber optic cable, among multiple independent signals generated by multiple users.
• FDM has been popularly used to multiplex calls in telephone networks. It can also be used in cellular networks, wireless networks, and for satellite communications.