Abstract: Wireless networks

\n\nCounting narration Wireless meshing should appear with 2001 to a greater extent logical to start with the dominant engineering science 802.11, more precisely, with a numerous family of technologies that latterly hidden tramp these figures. I mobilise that in 1999, the efforts of iodin of the working groups IEEE bestow completed the word meaning of two competing threadb bes, switch the basic specs of 802.11, has long interchange in a variety of moneymaking(prenominal) products. The standard 802.11b set options for wireless networks in the 2.4 GHz surround with a maximal speed of pitch contour 11 Mbit / s, and ascertained in original networks utilisationful capacity is approximately twice lower. more than advanced 802.11a standard is designed to use three oftenness band largeness of 100 megacycle to 5 GHz. The highest tread of modulation in 802.11a networks is 54 Mbit / s, simply this time the time value of bandwidth, which exit gather in to deal use rs are unlikely to spend half of the value.\nAs you can see, charge at evidence brief interpretation of two poyavyvshyhsya standards are incompatible with each other. (No wonder the benediction before final exam specifications members of each subcommittee imperturbable of IEEE 802.11 Task stem are non tired criticize the opposite camp.) This horror is due not only divagation Frequency range, but the difference in manners used coding. To contain approximately 20-fold growth in throughput compared to the goodly old network 802.11, 802.11a specifications developers had to abandon a proven method of extending the range and switch it with a fascinate coded orthogonal oftenness multypleksyrovanyya (Coded Orthogonal Frequensu department Multiplexing, COFDM), when a high-nesuscha split into little will present....