Wireless Data Transmission

For wireless data transmission to occur you need three things

• A transmitter

• A receiver

• A wireless channel– The higher the frequency of the channel the

more information it can transfer.

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http://www.amazon.com/Samsung-WIS09ABGN-LinkStick-Wireless-Adapter/dp/B0021LA1BE

Short Range Data Transmissions

Bluetooth Wifi

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Bluetooth

• Range is up to 10 feet and in some cases reach up to 100 meters

• Small Bluetooth chip inserted into the device along with software to run it.

• Invented in 1994 by engineers at Ericsson• In 1998 a group of companies joined forces to add it into

their technology so no company ‘owns’ the rights to it. The group is called SIG (special interest group)

• Meant to be a collaborative tool between various types of technology.

Wi-Fi

• Wireless fidelity• Small Hotspots

– Accessible with a router, and a

• Transmit at frequencies of 2.4 GHz or 5 GHz

• WiFi radios can transmit on any of three frequency bands – They can also hop between the frequencies to

that more devices can be in the network.

Types of Wifi Networks

Long Range Data Transmissions

• WiMax

• Satelite

• Cellphone 3G and 4G services

• UWB (Ultra wide bandwidth)

WiMAX

• Worldwide Interoperability for Microwave Access

• Range - 30-mile (50-km) radius from base station

• Speed - 70 megabits per second • Line-of-sight not needed between user

and base station • Frequency bands - 2 to 11 GHz and 10 to

66 GHz (licensed and unlicensed bands)

Satelitte

• receive (download) at a speed of about 1 Mbps

• send (upload) at a speed of about 200 kbps.

• http://www.fcc.gov/cgb/consumerfacts/highspeedinternet.html

Cell Phone 3G and 4G Services

• Generally slower than broadband

• Mindprod.com/igloss/transmissionspeed.html

Network Standards802.11a IEEE wireless

networking standard 54Mbps 5GHz

802.11b IEEE wireless networking standard 11Mbps 2.4GHz

802.11g IEEE wireless networking standard 54Mbps

g+ up to 125Mbps

2.4GHz

802.11n MIMO (multiple-input multiple-output) technology

540Mbps

•http://www.newegg.com/product/CategoryIntelligenceArticle.aspx?articleId=232