Wireless Networking Tutorial

Wireless Transmission :

Terrestrial Microwave

•         Parabolic dish

•         Focused beam

•         Line of sight

•         Long haul telecommunications

•         Higher frequencies give higher data rates

Satellite Microwave

•         Satellite is relay station

•         Satellite receives on one frequency, amplifies or repeats signal and transmits on another frequency

•         Requires geo-stationary orbit

—      Height of 35,784km(distance from earth)

•         Television

•         Long distance telephone

•         Private business networks

Satellite Point to Point Link

Broadcast Radio

v      Omnidirectional

v      FM radio

v      UHF and VHF television

v      Line of sight

v      Suffers from multipath interference

—      Reflections

Infrared

�      Modulate noncoherent infrared light

�      Line of sight (or reflection)

�      Blocked by walls

�      e.g. TV remote control, IRD port

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