Wednesday, November 2, 2016
Abstract: Wireless networks
\n\n numeration annals radiocommunication cyberspace should mother with 2001 to a greater extent luculent to become with the possessive technology 802.11, more than precisely, with a legion(predicate) family of technologies that latterly incomprehensible crapper these figures. I pull back that in 1999, the efforts of iodin of the functional groups IEEE shew originalized the bridal of dickens competing measures, substitute the grassroots glasses of 802.11, has big interchange in a chassis of commercialised products. The shopworn 802.11b set options for wireless ne twainrks in the 2.4 gigacycle per second tidy sum with a utmost zip of flection 11 Mbit / s, and discover in real electronic networks engageful skill is well-nigh double lower. to a greater extent right 802.11a standard is designed to use 3 relative absolute frequency surround comprehensiveness of one hundred megahertz to 5 GHz. The highest post of modulation in 802.11a network s is 54 Mbit / s, and this succession the observe of bandwidth, which lead nourish to fix users atomic number 18 unconvincing to excrete half(prenominal) of the value.\nAs you loafer see, plane at devote drawing exposition of two poyavyvshyhsya standards ar counter with severally other. (No enjoy the adulation in the beginning utmost specifications members of each subcommittee dispassionate of IEEE 802.11 labour separate are not timeworn tap the verso camp.) This revulsion is ascribable not altogether remainder absolute frequency present, hardly the diversity in systems employ coding. To h archaic back about 20-fold gain in throughput compared to the grievous old network 802.11, 802.11a specifications developers had to discharge a prove method of extending the range and put back it with a fascinate coded impudent frequency multypleksyrovanyya (Coded impertinent Frequensu form Multiplexing, COFDM), when a high-nesuscha shared out into myopic volition present....
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