نتایج جستجو برای: spectrum assignment
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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 ...
2.3. Symmetry Aspects 4112 2.4. Computation of the Spectrum 4113 3. Rovibrational Spectrum of Argon−Methane 4113 3.1. The Schrödinger Equation and Its Solution 4114 3.2. The Spectrum and Its Assignment 4117 4. Water Pair Potential and Dimer Spectrum 4118 4.1. Tunneling Processes in the Water Dimer 4119 4.2. Dynamics Calculations 4120 4.3. Pair Potential and Dimer VRT Levels 4121 5. Three-Body I...
1556-6072/09/$25.00©2009IEEE IEEE VEHICULAR TECHNOLOGY MAGAZINE | JUNE 2009 Digital Object Identifier 10.1109/MVT.2009.932543 The radio spectrum is a precious resource that underpins various wireless services. It is traditionally regulated by a fixed frequency assignment policy, which allocates frequency bands to license holders for exclusive use. Such a static and rigid spectrum-licensing poli...
Modern cellular mobile communications systems are characterized by a high degree of capacity. Consequently, they have to serve the maximum possible number of calls while the number of channels per cell is limited. The objective of channel allocation is to assign a required number of channels to each cell such that both efficient frequency spectrum utilization is provided and interference effect...
Assignments of electronic bands in the high resolution photoelectron spectrum of the VO2¯ anion obtained via slow electron velocity-map imaging are discussed in light of a recent theoretical paper that questioned them and proposed an alternate assignment.
Assignment of the fifteen carbons of terrecyclic acid A, C15H20O3, a new sesquiterpene antibiotic, in the 13C NMR spectrum was performed by 13C-[1H] selective proton decoupling experiments, comparison with spectra of its derivatives and chemical shifts.
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