Block diagram of communication system

Block diagram of communication system
Block diagram of communication system

The figure shows the block diagram of the communication system, as we can see communication blocks are been divided into two sections, one is transmitter section and the receiver section.

Transmitter section

  • Information source
  • Input transducer
  • Amplifier
  • Modulator
  • Transmission antenna

Intermediate section

  • Channel
  • Noise or interferences

Receiver section

  • Information source
  • Output transducer
  • Booster amplifier
  • Detector
  • Demodulator
  • Receiving antenna

Explain the important blocks of the transmission section

The transmission section of the communication system is one of the important blocks of communication.

  1. Information source

The source of information is a basic concept in the communication and processing unit, source is the block used to encode the information which may be transmitted via a channel.

  1. Input transducer

Input transducer
Input transducer

The input transducer is a block used at the transmitting section for the conversion of a physical quantity or non-electrical signal to an electrical signal.

  1. Amplifier

An amplifier is a circuit used to strengthen the signal voltage, current, and power, the amplifier is used at a wireless communication system for the amplification of the transmitting signal.

  1. Modulator


The modulator is the circuit used to vary different quantities of the transmitting signal or superimpose a high-frequency signal to the main signal, to protect the main signal from unwanted noise and interference.

  1. Transmission antenna

Transmission antenna
Transmission antenna

A transmission antenna is used to transmit a piece of information from transmitter to receiver, the signal we used to transmit will be an electromagnetic wave, so the antenna is used to emit the signal to the channel.

An explanation for the Intermediate section

  1. Channel

The channel is referred are the most important part of the communication system because the channel is the mediator between sender and receiver.

At wireless communication system air, the channel and on wired communication wire is the mediator, different type of channels are used as the channel at communication systems.

Explain the important blocks of the receiver section 

The receiver is the section used to receive the information we transmit, so naturally, the receiver section had the reverse order processing blocks when we compare to the transmitter.

  1. Receiving antenna

The receiving antenna is used to receive the information we sent from the transmitting antenna.

But the process that happens on the receiving antenna is opposite to the transmitting antenna, they receive the emitted signal and convert it into an electrical signal, then pass over to the next section.

  1. Demodulator

The demodulator is a circuit used to separate the wanted signal from the unwanted modulated signal, the modulator made a signal for the transmission.

The modulator varies different quantities of the signal and also imposes a higher frequency signal to the transmitting signal.

So the demodulator will separate the wanted signal and unwanted signal then passes over the wanted signal for further processing.

  1. Detector

The detector and demodulator is a combination arrangement used to separate the wanted signal we send from the transmitter, the detector is used to detect the wanted signal and pass over it to the next section.

  1. Booster amplifier

The booster amplifier at the receiver section is used to strengthen the weaken signal, the noise, and interferences mixed with the transmitted signal and it will cause signal loss, so the booster amplifier is used to amplify the signal and passes over to the next transducer circuit.

  1. Output transducer

Output transducer
Output transducer

The output transducer is a transducer present at the output side of the system, here at the communication system it is present at the receiver section.

The output transducer converts the electrical signal to a non-electrical signal, which may be sound, light, or vibration signals.

  1. Receiver information source

The receiver information source is a block used in the communication system for signal processing and decoding.

The adjacent block which is the output transducer will convert the electrical signal to non-electrical quantity, then the information source process the signal and completely decodes the wanted signal.

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