infrared and radio transmission
DESCRIPTION
Comparison between Infrared and Radio CommunicationsTRANSCRIPT
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Infrared &
Radio Transmission
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Infrared Transmission
• Infrared (IR) light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light
• Employed in short-range communication among computer peripherals and personal digital assistants and electronic devices
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• Uses infrared light-emitting diodes
• Receiver uses a silicon photodiode to convert the infrared radiation to an electric current
• Responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light
Propagation
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Uses
• Short Range Communication
• Indoor use
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Advantages
• Simple Circuit• Cheap• Low Power Consumption• No Licenses Needed• Higher Security• Simple Shielding• Portable
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Disadvantages
• Works ONLY on Line-of-Sight (LOS) Mode
• Short Range
• Blocked by common materials: people, walls, etc
• Low bandwidth
• Speed is comparatively slow
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Examples
• Remote Control
• Mobile Phones
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Radio Transmission
• Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light
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Propagation
• Radio waves travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space
• Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width
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Uses
• Audio• Telephony• Video• Navigation• Radar• Data (Digital Radio)• Radio control
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Advantages
• Simple Circuit
• Cheap
• No Licenses Needed
• High Speed/Bandwidth
• Covers Large Areas (Penetrates through walls)
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Disadvantages
• Limited number of free frequency bands
• Shielding is difficult
• Interference with other electrical devices
• Greater Power Consumption
• Limited Spectrum of Frequency
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Examples
• FM Channels
• Walkie Talkies