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.

Short Range Data Transmissions Bluetooth Wifi Ad hoc

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. speedinternet.html

Cell Phone 3G and 4G Services Generally slower than broadband

Mindprod.com/igloss/transmissionspeed.ht ml

Network Standards a IEEE wireless networking standard 54Mbps5GHz b IEEE wireless networking standard 11Mbps2.4GHz g IEEE wireless networking standard 54Mbps g+ up to 125Mbps 2.4GHz n MIMO (multiple-input multiple-output) technology 540Mbps