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Toplam kayıt 48, listelenen: 1-20

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M-ary pulse position modulation performance with adaptive optics corrections in atmospheric turbulence

Ata, Yalçın (2020-04-24)

The performance of M-ary pulse position modulated (PPM) optical wireless communication (OWC) systems in atmospheric weak turbulence medium is evaluated by using adaptive optics corrections. Piston, tilt, defocus and coma ...
Application of adaptive optics on bit error rate of M-ary pulse-position-modulated oceanic optical wireless communication systems

Ata, Yalçın (2020-06-25)

An adaptive optics correction arising from the sum of tilt, focus, astigmatism and coma components is applied to the bit error rate (BER) of M-ary pulse-position-modulated (PPM) oceanic optical wireless communication ...
BER performance ofM-ary pulse position modulated communication systems in anisotropic non-Kolmogorov turbulent atmosphere

Ata, Yalçın (WAVES IN RANDOM AND COMPLEX MEDIA, 2020-08)

We investigated the effect of anisotropic non-Kolmogorov atmospheric turbulence on the performance of the optical wireless systems whenM-ary Pulse Position Modulation (PPM) is applied to a Gaussian beam. The performance ...
Adaptive optics effect on performance of BPSK-SIM oceanic optical wireless communication systems with aperture averaging in weak turbulence

Ata, Yalçın (2020-11)

Turbulence-induced wavefront deformations cause the irradiance of an optical signal to fluctuate resulting a in serious degradation in the bit-error-rate (BER) performance of optical wireless communication (OWC) system. ...
Performance of M-ary pulse position modulated optical wireless communications systems in the marine atmosphere

Ata, Yalçın (2021-03-10)

The marine atmosphere exhibits different turbulence spectrum characteristics when compared to the turbulence spectra of the land atmosphere and underwater medium. The performance of M-ary pulse position modulated (PPM) ...
Adaptive optics correction in natural turbulent waters

Ata, Yalçın (2021-04)

The recently introduced power spectrum of the refractive index fluctuations of the natural oceanic water turbulence is applied to an underwater communication system in the presence of adaptive optics corrections. The effects ...
BER variation of an optical wireless communication system in underwater turbulent medium with any temperature and salinity concentration

Ata, Yalçın (2021-04-15)

The effect of natural turbulence on an underwater wireless optical communication (UWOC) link using the on-off-key (OOK) modulation scheme and a coherent plane wave is analyzed in terms of the signal-to-noise ratio (SNR) ...
Electromagnetic Hanbury Brown and Twiss Effect in Atmospheric Turbulence

Ata, Yalçın (2021-06)

The evolution of the 4 x 4 matrix with elements being the scintillation indices of the single-point Stokes parameters of a stationary electromagnetic beam-like optical field in classic, weak atmospheric turbulence is ...
Signal-to-noise ratio with adaptive optics compensation in non-Kolmogorov weak turbulent atmosphere

Ata, Yalcin (2021-07)

This study investigates the average signal-to-noise ratio < SNR > at the shot-noise limited receiver of an optical wireless communication system (OWC) that uses collimated Gaussian beam with adaptive optics correction in ...
Machine Learning Approach Equipped with Neighbourhood Component Analysis for DDoS Attack Detection in Software-Defined Networking

Kocaoğlu, Ramazan (2021-07-07)

The Software-Defined Network (SDN) is a new network paradigm that promises more dynamic and efficiently manageable network architecture for new-generation networks. With its programmable central controller approach, network ...
Signal-to-noise ratio with adaptive optics compensation in non-Kolmogorov weak turbulent atmosphere

Ata, Yalçın (2021-07-28)

This study investigates the average signal-to-noise ratio < SNR > at the shot-noise limited receiver of an optical wireless communication system (OWC) that uses collimated Gaussian beam with adaptive optics correction in ...
Underwater imaging in optical turbulence: average temperature and salinity effects

Ata, Yalçın (2021-10-01)

Classic imaging systems may experience deleterious effects of optical turbulence, leading to their quality degradation induced by image jitter and blur. Using a recently introduced model for the refractive index power ...
Underwater imaging in optical turbulence: average temperature and salinity effects

Ata, Yalçın (OPTICAL SOC AMER, 2021-10-10)

Classic imaging systems may experience deleterious effects of optical turbulence, leading to their quality degradation induced by image jitter and blur. Using a recently introduced model for the refractive index power ...
Wave and phase structure functions of plane and spherical waves in particle-free natural turbulent waters

Ata, Yalçın (ELSEVIER, 2021-10-15)

The expressions for the wave and the phase structure functions of a plane wave and a spherical wave propagating in the natural water turbulence characterized by the recently developed spatial power spectrum (Yao et al., ...
Electromagnetic phase coherence gratings for atmospheric applications

Ata, Yalçın (2021-10-15)

We propose using electromagnetic phase coherence gratings (EMPCGs) for fine spatial segregation in polarimetric components of stationary beams on their propagation in atmospheric turbulence. Unlike for other beams, e.g., ...
Effects of adaptive optics on bit error rate of M-ary PPM oceanic optical wireless communication systems with aperture averaging in strong turbulence

Ata, Yalçın (2021-11-01)

Scintillation is the result of oceanic turbulence reducing the bit error rate (BER) performance of oceanic optical wireless communication (OWC) systems. The scintillation, also known as intensity fluctuations, occurs due ...
Adaptive optics compensation of M-ary pulse position modulated communication systems in anisotropic non-Kolmogorov turbulent atmosphere

Ata, Yalcin (2021-12-15)

Adaptive optics compensation effect on the performance of an optical wireless communication system (OWC) employing M-ary pulse position modulation (PPM) scheme in anisotropic non-Kolmogorov turbulent atmosphere is investigated. ...
Adaptive optics compensation of M-ary pulse position modulated communication systems in anisotropic non-Kolmogorov turbulent atmosphere

Ata, Yalçın (2021-12-15)

Adaptive optics compensation effect on the performance of an optical wireless communication system (OWC) employing M-ary pulse position modulation (PPM) scheme in anisotropic non-Kolmogorov turbulent atmosphere is investigated. ...
On the performance of wireless optical communication systems in underwater channels

Ata, Yalçın (2022)

In this paper, we investigate the probability of error for an optical wireless communication system employing binary phase-shift keying (BPSK) subcarrier intensity modulation (SIM) in underwater communication channel. ...
HAPS based FSO Links Performance Analysis and Improvement with Adaptive Optics Correction

Ata, Yalçın (2022)

This paper investigates the performance of high altitude platforms high altitude platforms (HAPS) based free-space optical (FSO) communication links including HAPS-to-ground station (downlink), ground-to-HAPS (uplink) and ...

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