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 Performance Analysis Transmit Antenna Selection Using Orthogonal Space-Time Block Codes.
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Performance Analysis Transmit Antenna Selection Using Orthogonal Space-Time Block Codes.

автор saeed k. издательство Книга по Требованию Книги
Cтраниц 92        мягкая обложка       
Аннотация:Multiple-input multiple-output (MIMO) systems that use multiple antennas can significantly improve the reliability and data rate of wireless communications. MIMO systems use space-time coding techniques such as orthogonal space-time block codes (OSTBCs). Pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM), and pulse shift keying (PSK) constellations are used in OSTBCs. Antenna selection is a scheme to reduce the system complexity and cost and uses a low-rate feedback channel from receiver to transmitter to improve the performance. We provide a novel analytical framework for the diversity analysis and approximation of BER to show approximations for BER expressions. In this thesis, we derive the bit error rate (BER) of OSTBCs with antenna selection for independent and receive correlated Rayleigh channels. However, the use of multiple antenna increases the complexity of both the transmitter and the receiver. As a conclusion the system achieves full diversity order when transmit antenna selection scheme is used.
Автор: saeed k.
Издательство: Книга по Требованию
Год:2010
Цена:
1893 руб
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Поиск: Performance Analysis Transmit Antenna Selection Using Orthogonal Space-Time Block Codes.



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В результате стандарт 802.11 g содержит компромиссное решение: в качестве базовых применяются технологии OFDM и ССК, а опционально предусмотрено использование технологии РВСС. В обоих стандарта обеспечивается автоматическое понижение скорости при ухудшении качества сигнала. Существуют также собственные разработки некоторых компаний по повышению скорости передачи, но они не стандартизованы и не могут быть использованы для работы с оборудованием других производителей. 802.11 Принятие стандарта 802.11 намечено на 2006 г. В его состав планируется включить современные технологии, обеспечивающие повышение пропускной способности (например, Space ime Block Codi g или S BC). Кроме того, в рамках нового стандарта должна будет осуществляться обратная совместимость с сетями и аппаратурой 802.11a/b/g. Но самое главное, что максимальная скорость передачи данных будет достигать 600 Мбит/с. Для ускорения принятия стандарта в октябре текущего года был создан консорциум EWC (E ha ced Wireless Co sor ium), в состав которого вошли компании Airoha, Apple, A heros, Azimu h, Broadcom, Buffalo, Cisco Sys ems, Co exa , D-Li k, Ga eway, I el, Le ovo, Li ksys, Li ePoi , Marvell, Me ali k, E GEAR, Rali k, Real ek, SA YO; So y, Symbol ech ologies, oshiba, USRobo ics, WildPacke s, Wi bo d и ZyDAS.
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