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Proposed Models for MC-CDMA Based on FFT and WT. Simulation and Performance Evaluation

Автор:   Salih S.
мягкая обложка
176 страниц
2010 год
Издательство:   Книга по Требованию
2623 руб
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Описание:The proposed models are based on generating phase matrix rotation algorithm. The results show that these models outperform the traditional models under different channel characteristics with high gain obtained from each model. The simulation performance of these models shows that the suggested models improved their performances in AWGN and the flat fading channel in comparing with the traditional model. In this book, there are six proposed models of MC- CDMA based on Fast Fourier Transform (FFT) and Wavelet Transform (WT) were introduced and their performances were compared with the traditional models for single user system. This type of wavelet transform does not require an additional array at each sweep, this leads to fast processing time and minimum memory size relative to the traditional model based wavelet transform. The first three models for MC-CDMA rely on FFT algorithm. The other three models of MC-CDMA rely on wavelet transform, especially in In-Place Wavelet Transform.

Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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Distributed operating systems

Distributed shared memory is a technique for making multicomputers easier to program by simulating shared memory on them. Small multiprocessors are often bus based, but large ones are switched. The protocols the large ones use require complex data structures and algorithms to keep the caches consistent. NUMA multiprocessors avoid this complexity by forcing the software to make all the decisions about which pages to place on which machine. A straightforward implementation of DSM, as done in IVY, is possible, but often has substantially lower performance than a multiprocessor. For this reason, researchers have looked at various memory models in an attempt to obtain better performance. The standard against which all models are measured is sequential consistency, which means that all processes see all memory references in the same order. Causal consistency, PRAM consistency, and processor consistency all weaken the concept that processes see all memory references in the same order. Another approach is that of weak consistency, release consistency, and entry consistency, in which memory is not consistent all the time, but the programmer can force it to become consistent by certain actions, such as entering or leaving a critical region ...»

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