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 DSSS COMMUNICATION LINK EMPLOYING COMPLEX SPREADING SEQUENCES. Master of Engineering
Наименование:

DSSS COMMUNICATION LINK EMPLOYING COMPLEX SPREADING SEQUENCES. Master of Engineering (Electronics), Faculty of Engineering, Built Environment

автор Frans M. издательство Книга по Требованию Прочие виды транспорта
Cтраниц 236        мягкая обложка       
Аннотация:The theoretical analysis and simulation of such a system will be presented, with a hardware implementation of all new concepts proposed. The concept analyzed, is based on the use of unique large families of spectrally well confined, constant envelope (CE) CSS. The generic DSSS system developed in this dissertation has originally been designed and implemented to investigate the practicality and usefulness of complex spreading sequences (CSS), and secondly, to verify the concept of non-linearly interpolated root-of-unity (NLI-RU) filtering. Conventional spread spectrum communication systems employ binary spreading sequences (BSS), such as Gold or Kasami sequences. Several novel concepts and subsystems have been added to the original system. The practical implementation of such a system is relatively simple, while the design and implementation of a DSSS communication system employing CSS is however considerable more complex. The CE characteristic of the new spreading sequences furthermore facilitates the design of power efficient systems with exceptionally robust performance characteristics in the presence of non- linear power amplification.
Автор: Frans M.
Издательство: Книга по Требованию
Год:2009
Цена:
3233 руб
Нет в наличии
Поиск: DSSS COMMUNICATION LINK EMPLOYING COMPLEX SPREADING SEQUENCES. Master of Engineering (Electronics), Faculty of Engineering, Built Environment
НОВЫЙ ГОД СИМВОЛ 2013 ГОДАУКРАШЕНИЯ
КАРНАВАЛ НА НОВЫЙ ГОД РАСПРОДАЖА
Ортомолекулярная медицина Orthomol Устрание причин заболеваний. Ортомоль это новый метод для лечения и профилактики болезней. Orthomol - ортомолекулярная медицина.
Электромагнитная совместимость сотовых сетей связи

CDMA использует технологию Direc Seque ce (Pseudo oise) Spread Spec rum (прямая последовательность (псевдошум) с широким спектром). Основа DSSS - использование шумоподобной несущей, и гораздо более широкой полосы, чем необходимо для обычных способов модуляции. Хотя DSSS была изобретена ещё в 1940-е, коммерческое применение началось только в 1995 году. Причиной тому - отсутствие технологий позволяющих создавать малогабаритные приёмопередатчики использующие DSSS. Кратко о CDMA. Представьте себе узкополосный сигнал промодулированный неким потоком данных со скоростью, например 9600 bps. Пусть есть уникальная, повторяющаяся, псевдослучайная цифровая последовательность со значительно большей скоростью, скажем 1.25 Mbps. Если менять фазу узкополосного сигнала в соответствии с псевдослучайной последовательностью, то мы получим шумоподобный сигнал с широким спектром, содержащий в себе информацию. Если рассмотреть, что происходит с точки зрения частоты - то получится что информационный сигнал "расплылся" (spread) по спектру шумоподобного сигнала (pseudo oise).
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