Commercial wireless technologies and examples…………

Here is a list of commercial wireless technologies available today.

AM radio

Amplitude modulated radio used for long range audio broadcasting. For example, Akashavani.

FM radio

Frequency modulated radio, provides better quality of sound for short range broadcasting. For example, Radio City.

Short wave radio

Used for communications, handheld radios and walkie talkies.

For example, radio handsets used by law enforcement agencies.

TV broadcasting

Digitally modulated signals carrying live audio and video for television audience. For example, Tata Sky.

Satellite communications

Satellites in geostationary orbits are used to capture and rebroadcast signals for intercontinental communications. For example, the INSAT series.

GSM

Global system for mobile communications is a cellular telephony technology based on time division and frequency division multiplexing. Operates at 900, 1,800 and 2,700 MHz. For example, Airtel, Idea, etc.

CDMA

This is a cellular telephony technology based on code division multiplexing. For example, Tata Indicom and Reliance Communications.

Infrared

TV remote controls use this as a means of communication.

Cordless telephones

Use radio waves to avoid the wire connecting the handset and the base unit.

GPS

Satellite-based positioning service that uses radio waves.

Wireless peripherals

Use radio waves instead of wires to connect to the PC. For example, wireless keyboard and mice.

Bluetooth

5-GHz short range wireless technology that allows several types of equipped electronic devices to interconnect.

Wi-Fi

Also known as IEEE 802.11a, b, g and n, this allows wireless local area networks to be set up. It also allows local wireless internet connections called hotspots.

RFID

Radio frequency identification devices, in which objects/ humans/animals wear small radio tagged devices that allow them to be located. For example, radio collars for dogs.

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