نتایج جستجو برای: sequential spectrum

تعداد نتایج: 309039  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده برق و کامپیوتر 1392

سیستم های طیف گسترده(spread spectrum) امروزه به طور وسیعی مورد استفاده قرار می گیرند. این سیستم ها ابتدا توسط ارتش آمریکا و در طی جنگ جهانی دوم مورد استفاده قرار گرفت. در سیستم های طیف گسترده دنباله خطی (direct sequence spread spectrum) سیگنال داده در یک دنباله شبه نویز ضرب می شود تا پهنای باند افزایش یابد. در گیرنده نیز سیگنال دریافتی پس از دمدولاسیون در یک دنباله شبه نویز همانند دنباله موجود ...

Journal: :Research Journal of Applied Sciences, Engineering and Technology 2013

2004
Stefan Antusch S. F. King

We review the mechanism of sequential right-handed neutrino dominance proposed in the framework of the type I seesaw mechanism to account for bi-large neutrino mixing and a neutrino mass hierarchy in a natural way. We discuss how sequential dominance may also be applied to the right-handed charged leptons, which alternatively allows bi-large lepton mixing from the charged lepton sector. We revi...

2004
Stefan Antusch S. F. King

We review the mechanism of sequential right-handed neutrino dominance proposed in the framework of the type I seesaw mechanism to account for bi-large neutrino mixing and a neutrino mass hierarchy in a natural way. We discuss how sequential dominance may also be applied to the right-handed charged leptons, which alternatively allows bi-large lepton mixing from the charged lepton sector. We revi...

2003
Shalin P. Trivedi Rajarathnam Chandramouli

Steganalysis of sequential steganography is presented in this paper. Abrupt change in statistics due to sequential embedding is exploited by the proposed technique. Analytical derivations are presented for several cases along with experimental results. Experiments show that the proposed method can be used quite effectively to detect locations and length of messages embedded using spread spectru...

2011
Roland Dobai

The dissertation thesis is aimed at test generation for asynchronous sequential digital circuits, contributes to their timeand cost-effective testing, and indirectly supports their wider application, which improves the performance, the power consumption and the electromagnetic emission of future digital circuits. The main scientific contribution is design of the new test generator (optimized fo...

2012
Xiong Zhang Zhengding Qiu

Reliable and swift spectrum sensing is a crucial technical challenge of cognitive radio. This study proposes a Sequential Energy Detection (SED) scheme to reduce the average required sample number and sensing time for spectrum sensing in low signal-to-noise ratio regime. In the scheme, the data samples are first grouped into data blocks and the Sequential Probability Ratio Test (SPRT) use the e...

Journal: :Parallel Algorithms Appl. 1998
José M. Badía Antonio M. Vidal

In this paper we present two parallel versions of bisection method to compute the spectrum of symmetric Toeplitz matrices. Both parallel algorithms have been implemented and analysed on a virtual shared memory multiprocessor using a portable message-passing environment. The algorithms very efficiently parallelize the sequential method, and the application of a dynamic strategy to distribute the...

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