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