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Локальные и корпоративные сети

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Локальные и корпоративные сети
Наименование:

Performance Evaluation of IEEE 802. 16e-2005 (Mobile WiMAX) Physical Layer Performance Evaluation of Mobile WiMAX in OFDM Physical Layer.

Формат:      Страниц 128
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Автор:
Gazi F.A.J.    
Издательство:
Книга по Требованию    
Год:2011
Цена:
2285 руб
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It contains full mobile internet access. In this thesis work, we built a simulation model based on 802. 16e OFDM-PHY baseband and demonstrated in different simulation scenarios with different modulation techniques such as BPSK, QPSK and QAM (Both 16 and 64) to find out the best performance of physical layer for WiMAX Mobile. Performance has been concluded based on BER, SNR and Pe output through MATLAB Simulation. Various applications have already been applied so far using WiMAX, as alternative to 3G mobile systems in developing countries, Wireless Digital Subscriber Line, Wireless Local Loop . IEEE 802. 16e-2005 has been developed for mobile wireless communication which is based on OFDM technology and this enables going towards the 4G mobile in the future. Telecommunication industries are highly concerned with the wireless transmission of data which can use various transmission modes, from point- to-multipoint links. The noise channel AWGN, Rayleigh fading, SUI, data randomization techniques, FFT and IFFT, and Adaptive modulation is used for the whole simulation procedure. All the necessary conditions were implemented in the simulation according to 802. 16e OFDMA-PHY specification.
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Технология WiMax
Роуминг позволяет при передвижении абонента на скорости до 120 км/ч «бесшовно» переключаться между базовыми станциями (точно так же как это происходит в сетях сотовой связи). В мобильном WiMAX применяется Scalable OFDMA — масштабируемый OFDM-доступ и возможна работа как в условиях прямой видимости так в ее отсутствие. Для сетей Mobile WiMAX выделяются частотные диапазоны: 2,3–2,5; 2,5–2,7; 3,4–3,8 ГГц. На сегодняшний день в мире реализованы и успешно функционируют беспроводные широкополосные сети на основе Mobile WiMAX, в том числе первыми в России свои сети развернули компании «Скартел» — бренд Yo a (сети построены в Москве, Санкт-Петербурге, Уфе, Краснодаре, Сочи, Никарагуа) и Комстар O C (сеть в Москве). Конкурентами 802.16e являются все мобильные технологии третьего поколения 3G, например, EV-DO. И если стандарт IEEE 802.16d является протоколом операторского класса, то мобильный WiMAX ориентирован на конечных пользователей, и в данном случае он представляет собой альтернативу стандартам 802.11 a/b/g. Имея ноутбук или КПК со встроенным WiMAX модемом, и подключившись к сети, пользователь сможет постоянно оставаться на связи в любой точке города, где обеспечивается зона покрытия WiMAX сети.


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