Communication System Fundamentals

Communication System Fundamentals

Our Target

  • Communication
  • Channel or medium or media
  • Frequency
  • Wavelength
  • Modulation
  • Demodulation
  • Baseband and Broadband
  • Noise
  • Attenuation

Communication

Communication is the process of exchanging information

Electronic Communication

A communication which takes place in the form of electronic or electrical signals

Electronic Communication System

It consist of transmitter, receiver and communication channel or medium

Communication Channel / medium / media

It is a path by which electronic signal is sent from one place to another place

It may be

  • Electrical conductor
  • Optical media
  • Free space

Frequency

Cycle per second is called frequency 

Wavelength

It is the distance covered  by one cycle

Modulation and Demodulation    

Modulation is a process in which we transmit low-frequency signal over a high-frequency signal

Demodulation is the reverse process

Baseband Transmission and Broadband Transmission

Transmission of information without modulation is baseband

Transmission of information with modulation is broadband

Reasons for modulation

  • Data rate
  • Antenna size
  • Long distance communication

Noise

Noise is a term which applies to any phenomenon that is used to degrade the message or information.

Attenuation

It is proportional to the distance between transmitter and receiver

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