Argyris Stassinakis

National and Kapodistrian University of Athens | uoa · Faculty of Physics

In this work, we try to minimize the mathematical complexity in analyzing outage and error performance by emulating multi-hop terrestrial FSO communication system as a single dual-hop scheme. More specifically, we approximate the topology of such a system and we estimate analytically its performance, by taking into account various modulation format...

The last years, FSO technologies raised interest from both scientific and commercial point of view. However, due to the optical beam propagation through the atmosphere, the signal is impaired by several phenomena like the scintillation effect, mainly because of atmospheric turbulence and imperfect misalignment between optical beam and destination t...

The interest for the optical wireless communication systems increases significantly the last years due to the very high advantages of this technology. More specifically, the FSO links can achieve very high data rate and secure communications with low installation and operational cost. However, the main disadvantage of the FSO links is that their pe...

Modern Visible light communications (VLC) use RGB LED lamps in order to illuminate an indoor environment and at the same time transmit information using a specific wavelength. Such systems have attracted military and research interest due to the advantages they offer, such as the high bit rate, low operational and installation cost and high securit...

The authors consider a point-to-point optical wireless communication link with on–off keying (OOK) modulation scheme. The propagation is deteriorated by the joint effects of gamma–gamma atmospheric turbulence and misalignment induced fading described by a non-zero boresight pointing error model. Mathematical expressions are derived for the average...

In this work we investigate the combined detrimental impact of atmospheric turbulence and spatial jitter, i.e. pointing errors, effects on the performance of a terrestrial free space optical (FSO) system, by taking into consideration several time diversity schemes and the time dispersion of the longitudinal optical chirped pulses which are employed...

The Free Space Optical (FSO) communication systems, are rapidly gaining popularity as effective, low cost and secure means of transferring data at high rates over relative short distances, with line of sight, through the atmosphere. However, due to the fact that the characteristics of the propagation path do not remain invariable, the systems’ perf...

The free space optical (FSO) communication systems have attracted significant research and commercial interest in the last few years because of their low installation and operational cost along with their very high performance characteristics. However, for terrestrial FSO links, the optical signal propagates through the atmosphere which exhibits ti...

Radio-on-free-space-optical (RoFSO) communication systems are gaining significant research and commercial interest due to their high bandwidth and high data rate transfer, along with their low operational and installation cost without the requirement for fiber cable infrastructure or installation license. On the other hand, due to the fact that the...

The free space optical (FSO) communication systems have attracted extensive research and commercial interest because of their high capacity levels that can achieve, the ease of deployment, the license free spectrum use, the low operational and installation cost that they offer. On the other hand their performance depends strongly on the atmospheric...

Free space laser communications are gaining popularity due to their high bandwidth and security transmission that they offer, the license free spectrum use and the sufficient reliability for operational and installation costs compared to RF communication systems. The radio on free space optics (RoFSO) is a technology of modulating RF signals on opt...

Radio on free space optics (RoFSO) is a technology similar to the Radio over Fiber (RoF) communication systems, which enables the transmission of radio frequency signals (RF) in the optical domain through the free space. As a consequence, high capacity links are implemented with low operational and installation costs and without need of license for...

The radio on free space optical (RoFSO) communication systems are gaining popularity due to their high data rates, license free spectrum and adequate reliability at installation and operational costs which are much lower than comparable technologies. A significant disadvantage of these systems concerns the randomly time varying characteristics of t...

The free space optical (FSO) and more specifically the radio on free space optical (RoFSO) communication systems are becoming very popular because they can achieve high bit rate transmission with low operational and installation cost. The main disadvantage of such systems is their dependence on the atmospheric conditions and more specifically the r...

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 investigate the evaluation of an RoFSO scenario employing the orthogonal frequency-division multiplexing scheme. Both phase shift key...

This paper elaborates on the end-to-end capacity of dual-hop free-space optical (FSO) communication systems employing amplify-and-forward (AF) relaying, assuming channel state information is only known at the receiving terminals. The relay is assumed to either possess perfect channel state information or have a fixed gain. The performance of the co...

The limitation due to the dispersion effect, in the bit rate that can be achieved by a terrestrial wireless optical link, which is using longitudinal pulses with, either, Gaussian or hyperbolic secant shape, is investigated in this work. This quantity constitutes a significant metric for system’s performance evaluation. The time dispersion, under s...

In this paper, we derive mathematical expressions for the evaluation of the average (ergodic) capacity of free-space optical (FSO) communication systems. Atmospheric turbulence conditions are modeled using the I-K distribution. Our newly derived expressions provide an efficient tool to assess the spectral efficiency of FSO communication systems. Nu...

Terrestrial free space optical telecommunication systems offer license-free very high bandwidth access characteristics with significantly low installation and operational cost. On the other hand, the performance of such a system depends strongly on the weather conditions in the area between the transmitter and the receiver due to the fact that the...

The scientific area of Free Space Optical (FSO) communication systems have attracted significant research and commercial attention in recent years. This is due to their cost-effective and license-free high bandwidth access characteristics. On the other hand, this technology is using the atmosphere as transmission media and thus the performance of a...

The possibi l i t y o f v e r y h i g h a n d s a f e d a t a rate transmission, with low installation and operational cost, without licensing fees, over relatively short propagation distances has driven free space optical communication systems to attract significant research and commercial interest. However, since signal propagation is realized th...