This document discusses the basic components of a radio communication system. It explains that a communication system exchanges information between two points by transmitting and receiving messages. The three main components are the transmitter, which modulates the message signal; the channel, which connects the transmitter to the receiver; and the receiver, which demodulates the received signal to reproduce the original message. The document also categorizes communication systems as either wired or wireless depending on the type of transmission channel used.

1. RADIO ENGINEERING
Week 2 Lecture 2
Understand the basics radio communication
MD.Sharif Uddin Shajib
Teaching Assistant
Department of EEE
World University of Bangladesh

2. Weekly Class Contents
 Basic components of Communication system
 Transmitter
 Receiver
 Channel

3. Communication:
The communication system is a system that describes the information exchange between two
points. The process of transmission and reception of information is called communication.

4. Components of Communication:
 The three essential components of a communication system are:
 Transmitter:
 The transmitter modulates the message signal.
 Modulation is the process of converting a signal into a form suitable for transmission.
 A transmitter is a telecommunications electrical device that generates radio waves so that data may
be transferred or received through an antenna.
 The transmitter may generate an alternating current of radio frequency, which is then applied to the
antenna, which radiates it as radio waves.

5.  Channel:
 A communication channel is a physical transmission channel in telecommunications and computer
networking.
 A channel is a device that delivers data from one or more senders (or transmitters) to one or more
receivers.
 Or in other words, the channel is what connects the output of the transmitter to the receiver
input.
 Receiver:
 The receiver does the demodulation. Demodulation is the process of recovering the correct
message signal.
 The received signal, which is picked up from the broadcast signal at the channel output, is
processed by the receiver to reproduce the original message signal in a recognizable form for
transmission.
 A radio receiver, also known as an FM receiver, is a device that receives radio waves and converts
the data carried by them into useable information.
 The desired frequency waves are caught using an antenna.

6. Block Diagram of Communication System

7.  Depending on the communication channel, the communication system is categorised as
follows:
 1. Wired (Line communication)
 Parallel wire communication
 Twisted wire communication
 Coaxial cable communication
 Optical fibre communication
 2. Wireless (Space communication)
 Ground wave communication
 Skywave communication
 Space wave communication
 Satellite communication