Πλοήγηση ανά Συγγραφέα "Sandalidis, H. G."
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BER performance of FSO links over strong atmospheric turbulence channels with pointing errors
Sandalidis, H. G.; Tsiftsis, T. A.; Karagiannidis, G. K.; Uysal, M. (2008)In this letter, we investigate the error rate performance of free-space optical (FSO) links over strong turbulence fading channels together with misalignment (pointing error) effects. First, we present a novel closed-form ... -
Channel Models for On-Body Communications
Sandalidis, H. G.; Maglogiannis, I. (2014)The need to find reliable and simultaneously simplistic propagation models in the majority of frequency bands, where wireless body area networks (WBANs) operate in, is the driving force leading to the appearance of many ... -
Coded Free-Space Optical Links over Strong Turbulence and Misalignment Fading Channels
Sandalidis, H. G. (2011)The performance of optical wireless systems deteriorates to a large extent from the presence of turbulence and pointing error effects. To meet the typical bit error rate (BER) targets for reliable communications within the ... -
Connectivity Issues for Ultraviolet UV-C Networks
Vavoulas, A.; Sandalidis, H. G.; Varoutas, D. (2011)This paper focuses on the connectivity issues of a non-line-of-sight (NLOS) optical wireless network operating in the ultraviolet UV-C spectral region. NLOS UV-C transmitters have a limited effective coverage and, hence, ... -
An efficient power constrained transmission scheme for hybrid OW/RF systems
Chatzidiamantis, N. D.; Georgiadis, L.; Sandalidis, H. G.; Karagiannidis, G. K. (2014)This paper investigates link layer transmission schemes for hybrid optical wireless (OW)/radio frequency (RF) systems with constraints on both per-link and total power consumption at the transmitter. Assuming timeslot ... -
FSO links with spatial diversity over strong atmospheric turbulence channels
Tsiftsis, T. A.; Sandalidis, H. G.; Karagiannidis, G. K.; Uysal, M. (2008)Free-space optical (FSO) communication has received much attention in recent years as a cost-effective, license-free and wide-bandwidth access technique for high data rates applications. The performance of FSO communication, ... -
Inverse Gaussian Modeling of Turbulence-Induced Fading in Free-Space Optical Systems
Chatzidiamantis, N. D.; Sandalidis, H. G.; Karagiannidis, G. K.; Matthaiou, M. (2011)We propose the inverse Gaussian distribution, as a less complex alternative to the classical log-normal model, to describe turbulence-induced fading in free-space optical (FSO) systems operating in weak turbulence conditions ... -
New results on turbulence modeling for free-space optical systems
Chatzidiamantis, N. D.; Sandalidis, H. G.; Karagiannidis, G. K.; Kotsopoulos, S. A.; Matthaiou, M. (2010)In this paper, we propose a statistical channel model, named as Double-Weibull, to describe the irradiance fluctuations in moderate and strong turbulence for free-space optical (FSO) systems. The proposed stochastic model ... -
Node Isolation Probability for Serial Ultraviolet UV-C Multi-hop Networks
Vavoulas, A.; Sandalidis, H. G.; Varoutas, D. (2011)Non-line-of-sight optical wireless transmission, operated in the unlicensed ultraviolet UV-C band, has been recently suggested as an alternative means of communication. However, due to limited coverage, relayed UV-C networks ... -
On the inverse-Gaussian shadowing
Chatzidiamantis, N. D.; Sandalidis, H. G.; Karagiannidis, G. K.; Kotsopoulos, S. A. (2011)The Inverse Gaussian (IG) distribution has been recently proposed as a less complex alternative to the classical log-normal distribution to describe shadowing phenomena. This paper investigates the performance of digital ... -
Optical Wireless Communications With Heterodyne Detection Over Turbulence Channels With Pointing Errors
Sandalidis, H. G.; Tsiftsis, T. A.; Karagiannidis, G. K. (2009)We study the error performance of an heterodyne differential phase-shift keying (DPSK) optical wireless (OW) communication system operating under various intensity fluctuations conditions. Specifically, it is assumed that ... -
Optical Wireless Links with Spatial Diversity over Strong Atmospheric Turbulence Channels
Tsiftsis, T. A.; Sandalidis, H. G.; Karagiannidis, G. K.; Uysal, M. (2009)Optical wireless, also known as free-space optics, has received much attention in recent years as a cost-effective, license-free and wide-bandwidth access technique for high data rates applications. The performance of ... -
Optimization models for misalignment fading mitigation in optical wireless links
Sandalidis, H. G. (2008)We consider a free-space optical (FSO) channel model affected by misalignment fading (pointing error) effects. Assuming intensity modulation/direct detection (IM/DD) with on-off keying BOOK), new closed form expressions ... -
Outage probability and ergodic capacity of free-space optical links over strong turbulence
Sandalidis, H. G.; Tsiftsis, T. A. (2008)The performance of a free-space optical (FSO) communication system under strong turbulence regime that follows the K distribution is evaluated. Some useful channel statistics are derived in closed form and the outage ... -
Performance Analysis of a Laser Ground-Station-to-Satellite Link With Modulated Gamma-Distributed Irradiance Fluctuations
Sandalidis, H. G. (2010)The performance of a ground-station-to-space laser uplink with a Gaussian-beam wave model subject to turbulence and beam wander effects is the topic of the present study. The modulated gamma distribution is used to describe ... -
Performance of a laser Earth-to-satellite link over turbulence and beam wander using the modulated gamma-gamma irradiance distribution
Sandalidis, H. G. (2011)We present an analytical framework for the performance evaluation of laser satellite uplinks over the major probabilistic impairments, i.e., atmospheric turbulence and beam wander. Specifically, we consider a ground-stat ... -
QAM and PSK OFDM RoFSO Over M-Turbulence Induced Fading Channels
Nistazakis, H. E.; Stassinakis, A. N.; Sandalidis, H. G.; Tombras, G. S. (2015)Free-Space Optical (FSO) technology can effectively transfer multiple radio-frequency signals, and this new technique is commonly referred in the technical literature as radio on FSO (RoFSO). In the present study, we ... -
A simple statistical model for turbulence-induced fading in free-space optical systems
Chatzidiamantis, N. D.; Sandalidis, H. G.; Karagiannidis, G. K.; Matthaiou, M. (2010)In this paper, we propose the Inverse Gaussian (IG) distribution, as a less complex alternative to Log-normal (LN), to describe turbulence-induced fading in free-space optical (FSO) systems operating in weak turbulence ... -
Throughput-Optimal Link-Layer Design in Power Constrained Hybrid OW/RF Systems
Chatzidiamantis, N. D.; Georgiadis, L.; Sandalidis, H. G.; Karagiannidis, G. K. (2015)The aim of this paper is to develop link layer transmission schemes for hybrid optical wireless (OW)/radio frequency (RF) systems, with constraints on both per-link and total average power consumption at the transmitter. ... -
Underwater Optical Wireless Networks: A k-Connectivity Analysis
Vavoulas, A.; Sandalidis, H. G.; Varoutas, D. (2014)In this paper, optical wireless has been addressed as a promising technology to provide high-bandwidth services for underwater communications. However, the significant attenuation degree due to high absorption and scattering ...