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 On Channel Estimation for Mobile WiMAX Least squares (LS) and linear minimum mean square error (LMMSE) channel estimation methods were considered in the case of block type pilot insertion.
Наименование:

On Channel Estimation for Mobile WiMAX

автор Waldo K. издательство Книга по Требованию Прочие виды транспорта
Cтраниц 84        мягкая обложка       
Аннотация:Least squares (LS) and linear minimum mean square error (LMMSE) channel estimation methods were considered in the case of block type pilot insertion. This estimate is obtained using a channel estimation algorithm. Channel equalization relies on an accurate estimate of the channel state information (CSI). In this book, frequency and time domain channel estimation methods typically used in classical OFDM systems, using block and comb type pilot insertion schemes, were analyzed and adopted for mobile WiMAX. At the receiver, the effect of multipath propagation is reduced by a process called channel equalization. In the case of comb type pilot insertion, piecewise constant, linear, spline cubic as well as discrete Wiener interpolation methods were considered. Mobile WiMAX is a recently released technology that makes use of an orthogonal frequency division multiplexing (OFDM) based physical layer to transmit information over a wireless communication channel. In mobile communication channels information symbols are transmitted through a communication channel that is prone to fading and multipath propagation.
Автор: Waldo K.
Издательство: Книга по Требованию
Год:2009
Цена:
1980 руб
Нет в наличии
Поиск: On Channel Estimation for Mobile WiMAX



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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