DSpace Home
→
Mühendislik Fakültesi
→
Browsing Mühendislik Fakültesi by Author

Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

Now showing items 21-40 of 282

Analysis of parallel decodable turbo codes

Gazi, Orhan (IEICE-INTS Electronics Information Communications Eng, 2012-05)

Turbo codes suffer from high decoding latency which hinders their utilization in many communication systems. Parallel decodable turbo codes (PDTCs) are suitable for parallel decoding and hence have low latency. In this ...
Annular beam scintillations in non-Kolmogorov weak turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (Springer, 2012-03)

In a weakly turbulent atmosphere governed by the non-Kolmogorov spectrum, the on-axis scintillation index is formulated and evaluated when the incidence is an annular Gaussian type. When the power law of the non-Kolmogorov ...
Annular beam scintillations in strong turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya; Nakiboğlu, Cem (Optical Soc Amer, 2010-08)

A scintillation index formulation for annular beams in strong turbulence is developed that is also valid in moderate and weak turbulence. In our derivation, a modified Rytov solution is employed to obtain the small-scale ...
Annular, cosh and cos Gaussian beams in strong turbulence

Eyyuboğlu, Halil T. (Springer, 2011-06)

For the strong atmospheric turbulence regime, the asymptotic on-axis scintillation behavior of annular, cosh and cos Gaussian beams is theoretically derived and illustrated with numerical examples. It is observed from the ...
Aperture Averaging of Focused Multi-Gaussian Beams

Kamacıoğlu, Canan; Baykal, Yahya; Yazgan, Erdem (Electromagnetics Acad, 2013)

We investigate the behavior of the power fluctuations of the focused annular and flat-topped beams when a realistic receiver possessing a finite sized aperture is employed in turbulent atmospheric optics links. Employing ...
Apertured paraxial Bessel beams

Umul, Yusuf Ziya (Optical Soc Amer, 2010-03)

The paraxial Bessel beam is obtained by applying an approximation in the wavenumbers. The scattering of the beams by a circular aperture in an absorbing screen is investigated. The scattered fields are expressed in terms ...
Application of equivalent structure constant in scintillations and BER found for non-Kolmogorov spectrum

Baykal, Yahya; Gerçekçioğlu, Hamza (Elsevier Science Bv, 2014-01-01)

The evaluation of system parameters in the non-Kolmogorov turbulent atmosphere involves the structure constant valid at the relevant non-Kolmogorov power law exponent. In some of the existing results, the comparisons of ...
Application of the complex point source method to the Schrodinger equation

Umul, Yusuf Ziya (Elsevier Science Ltd, 2010-11)

The paraxial wave equation is a reduced form of the Helmholtz equation. Its solutions can be directly obtained from the solutions of the Helmholtz equation by using the method of complex point source. We applied the same ...
Application of the Method of Transition Boundary To the Half-Planes With Mixed Boundary Conditions

Umul, Yusuf Ziya (Elsevier GMBH, 2020-03)

The scattering problems of waves by soft-hard and hard-soft half-planes are investigated by the method of transition boundary. The functional values at the transition boundaries are found to be identical to the ones for ...
Arbitrary laser beam propagation in free space

Arpalı, Çağlar; Baykal, Yahya; Nakiboğlu, Cem (Elsevier Science, 2009-08-15)

The propagation of arbitrary laser beams in free space is examined. For this purpose, starting with an incident field of arbitrary field distribution, the intensity at the receiver plane is formulated via Huygens Fresnel ...
Area scintillations of Bessel Gaussian and modified Bessel Gaussian beams of zeroth order

Eyyuboğlu, Halil T. (Springer, 2010-01)

As an extension of our previous study, the area scintillation aspects of Bessel Gaussian and modified Bessel Gaussian beams of zeroth order are investigated. The analysis is carried out on the basis of equal source sizes ...
Atmospheric Propagation Model and Affecting On Laser Beam Propagation Via Free Space

Khamees, Hussein T. (OSA - The Optical Society, 2017)

In this article, a laser source (He-Ne) laser with maximum output power ( 2.95 mW) was used to study and analyze laser beam when the laser propagates through the atmosphere. Atmosphere layer, also the spot diameter of the ...
Average intensity and spreading of an elegant Hermite-Gaussian beam in turbulent atmosphere

Yuan, Yangsheng; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2009-06-22)

The propagation of an elegant Hermite-Gaussian beam (EHGB) in turbulent atmosphere is investigated. Analytical propagation formulae for the average intensity and effective beam size of an EHGB in turbulent atmosphere are ...
Average intensity and spreading of partially coherent standard and elegant Laguerre-Gaussian beams in turbulent atmosphere

Wang, F.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (E M W Publishing, 2010)

Analytical expressions for the average intensity, mean-squared beam width and angular spread of partially coherent standard and elegant Laguerre-Gaussian (LG) beams propagating in turbulent atmosphere are derived. The ...
Average irradiance and polarization properties of a radially or azimuthally polarized beam in a turbulent atmosphere

Cai, Yangjian; Qiang, Lin; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Society of America, 2008-05-26)

Analytical formulas are derived for the average irradiance and the degree of polarization of a radially or azimuthally polarized doughnut beam (PDB) propagating in a turbulent atmosphere by adopting a beam coherence-polarization ...
Average transmittance in non-Kolmogorov turbulence

Ata, Yalçın; Baykal, Yahya; Gerçekçioğlu, Hamza (Elsevier Science Bv, 2013-09-15)

Average transmittance in non-Kolmogorov turbulence is evaluated. Our recently published equivalent structure constant formulation is employed in our numerical evaluations. At the fixed propagation distance and wavelength, ...
Babinet's principle in the Fraunhofer diffraction by a finite thin wire

Umul, Yusuf Ziya (Elsevier GMBH, 2011)

The scattered waves by a thin finite wire are evaluated by using the Rayleigh-Sommerfeld integral in the Fraunhofer approximation. The scattered fields by the complementary thin wire are also obtained with the aid of the ...
Beam wander characteristics of cos and cosh-Gaussian beams

Çil, Celal Zaim; Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Springer, 2009-06)

Within the context of a general beam formulation, beam wander characteristics of cos and cosh-Gaussian beams are derived and numerically evaluated. In our graphs, the fundamental Gaussian beam is used as a benchmark for ...
Beam Wander Characteristics of Flat-Topped, Dark Hollow, Cos and Cosh-Gaussian, J(0)- And I-0- Bessel Gaussian Beams Propagating In Turbulent Atmosphere: A Review

Eyyuboğlu, Halil T.; Baykal, Yahya; Çil, Celal Z.; Korotkova, Olga; Cai,Yangjian (Spie-Int Soc Optical Engineering, 2010)

In this paper we review our work done in the evaluations of the root mean square (rms) beam wander characteristics of the flat-topped, dark hollow, cos-and cosh Gaussian, J(0)-Bessel Gaussian and the I-0-Bessel Gaussian ...
Beam Wander of J (0)- and I (0)-Bessel Gaussian Beams Propagating In Turbulent Atmosphere

Çil, Celal Zaim; Eyyuboğlu, Halil T.; Bykal, Yahya; Korotkova, Olga; Cai, Yangjian (Springer, 2010-01)

Root mean square (rms) beam wander of J (0)-Bessel Gaussian and I (0)-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is ...

Now showing items 21-40 of 282

Search DSpace

Browse

All of DSpace
- Communities & Collections
- By Issue Date
- Authors
- Titles
- Subjects
- Type
- Language
- Department
- Publisher
- Citation
This Community
- By Issue Date
- Authors
- Titles
- Subjects
- Type
- Language
- Department
- Publisher
- Citation

Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

Search DSpace

Browse

All of DSpace

This Community

My Account