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Cellular, Bluetooth/Wi-Fi, RFID

Cellular, Bluetooth/Wi-Fi, RFID. http://www.macos.utah.edu/documentation/hardware/bluetooth/mainColumnParagraphs/010/image/bluetooth_logitech_mx.png. http://www.mobile-review.com/phonemodels/sonyericsson/image/t610-1.jpg. http://img.alibaba.com/photo/11311936/A6sset_Tag.jpg.

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Cellular, Bluetooth/Wi-Fi, RFID

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  1. Cellular, Bluetooth/Wi-Fi, RFID http://www.macos.utah.edu/documentation/hardware/bluetooth/mainColumnParagraphs/010/image/bluetooth_logitech_mx.png http://www.mobile-review.com/phonemodels/sonyericsson/image/t610-1.jpg http://img.alibaba.com/photo/11311936/A6sset_Tag.jpg http://www.cnet.com.au/shared/images/products/wi-fi_200x150.jpg

  2. Frequency Range • Cellular phone systems • 824-894 MHz. (older system- no long in use) • 1850-1990 MHz. (Most common –PCS band0 • Bluetooth and Wi-Fi • 2400-2497 MHz. Unlicensed Band - ULB) • RFID • 850-980 MHz (Other frequencies also used)

  3. Cellular Phone System • Cell phones operate in “cells” which is a small geographic area • Calls are switched from cell to cell as needed. • Each cell varies in size based on demand • A cell can be looked at as a geographic coverage area with a base station (tower) which transmits signals to, and receive signals from, the mobile phones in its cell. • Calls are routed to a central switching station and then forwarded to complete your call via other cell towers, land lines, microwave links, fiber optic lines, satellite links, etc.

  4. Bluetooth • The name Bluetooth comes from a Danish king that united various kingdoms. Erickson initially used the term • Bluetooth allows devices such as cellular phones, computers, computer input and output devices, digital cameras, earpiece devices, and video game consoles to communicate with one another wirelessly. • Bluetooth has a typical range of 1-10 meters and operates at low power (1-10 milliwatts) http://kuwin.ku.ac.th/images/bluetooth-picture.jpg

  5. Wi-Fi • Wireless-Fidelity or Wi-Fi • Wi-Fi ranges to about 100 meters. • Wi-Fi can operate at 2.4GHz and 5.0 GHZ • The most common is a 2.4 GHz • Wi-Fi specifications are set by the IEEE • Wi-Fi is primarily used to provide internet access from your computer without a hard wire connection. • “Hotspots” refer to an area with Wi-Fi access • Hotels, airport lobbies, restaurants, coffee shops are common places to find W-Fi available • Wi-Fi can reach data transferable rates of • 54 Mbps (802.11a and 802.11g) • 11 Mbps (802.11b) • WiMAX (new) range to 2 miles – cover a city with internet access

  6. RFID • Radio-frequency identification (RFID) automatically identifies • Relies on storing and retrieving data using devices called transponders. • Radio-frequency identification is passive, active, or semi-passive. • Passive RFID tags use the incoming signal for power to respond • An RFID system consists of antenna, a transceiver, and a transponder. http://www.racoindustries.com/images/socket-rfid-6e-device3.jpg http://www.rexam.com/files/reports/2005cpr/images/pictures/pho_media_rfidchip2_lg.jpg

  7. http://upload.wikimedia.org/wikipedia/commons/9/99/RFID_hand_1.jpghttp://upload.wikimedia.org/wikipedia/commons/9/99/RFID_hand_1.jpg http://upload.wikimedia.org/wikipedia/commons/c/c5/RFID_hand_2.jpg RFID tag before RFID tag after An RFID tag implanted under the skin

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