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Wireless technology - Essay Example

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Infrared is an invisible band of radiation that exists at the lower end of the visible electromagnetic spectrum and is most effective when a clear line-of-sight exists between the transmitter and the receiver. Direct-beam infrared offers data rate from 1 to 10 Mbps and…
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Download file to see previous pages There is no government regulation (worldwide) controlling use of it. Infrared has immunity to electro-magnetic and RF interference. In addition, Infrared communication is secure and separate infrared installation can be operated in every room in a building without interference. Limitation of it is that infrared signals cannot penetrate solid objects and affected by the light, snow, ice, and fog.
The term narrowband microwave refers to the use of a microwave radio frequency band for signal transmission, with relatively narrow bandwidth: just wide enough to accommodate the signal, typically 12.5 kHz or 25 kHz. Because of it works in very short bandwidth, therefore it comes in licensed and unlicensed categories. Unlicensed (ISM) Narrowband microwave works in three bandwidth spectrum (900 MHz, 2.4 GHz, 5.7 GHZ). It can provide a data rate from 1to 20 Mbps. Narrow bandwidth combined with high power results in larger transmission distances that are available from 900 MHz or 2.4 GHz spread spectrum systems, which have lower power levels and wider bandwidths. UHF wireless data communication systems normally transmit in the 430 to 470 MHz frequency range, with rare systems using segments of the 800 MHz range. The lower portion of this band 430-450 MHz is often referenced as unprotected (unlicensed) and 450-470 MHz is referred to as the protected (licensed) band. It has a range of approximately 100 meter for indoor and 1 to 2 miles for outdoor. The main advantage of UHF is its range. The disadvantage of these technologies (UHF) is its low throughput. RF license are required for protected bands that are provided by radio authorities in each country who regulate and license specific frequencies to users. (Guide to Wireless LAN Technologies)
The most commonly used Wireless technology is spread spectrum that can provide a data rate up to 20 Mbps. Because the Federal Communication Commission (FCC) does not require site licensing for the bands used by ...Download file to see next pagesRead More
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