Principles of communication systems

Communication systems, block diagram of 'real time' communication system.



Only the purpose of each stage is required.

Transmission media

Transmission-path media: metal wire, optic fibre, electromagnetic (radio, microwave).

Ground wave, refraction and reflection of sky waves, diffraction of long-wavelength radiation around the Earth’s surface.

Satellite systems and typical transmission frequencies.

Students should recognise that up-links and down-links require different frequencies so that the receivers are not de-sensed.

Advantages and disadvantages of various transmission media. Students should consider data transmission rate, cost, and security issues.