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FOCUS

Title
Free-Space Optical Systems for Next Generation Communication Networks
Funding
EC | FP7 | SP3 | PEOPLE
Call
FP7-PEOPLE-2010-RG
Contract (GA) number
268318
Start Date
2010/09/01
End Date
2014/08/31
Open Access mandate
no
Special Clause 39
no
Organizations
OZYEGIN UNIVERSITY OZUN
More information
Detailed project information (CORDIS)

 

  • Multi-hop coherent free-space optical communications over atmospheric turbulence channels

    Aghajanzadeh, S. M.; Uysal, Murat (2011)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we investigate multi-hop relaying as an efficient fading mitigation tool for coherent free-space optical (FSO) systems over atmospheric turbulence channels. We consider an FSO relaying system with decode-and-forward relay nodes and multiple heterodyne receivers with modal compensation. Based on a recently introduced statistical characterization for the combined effe...

    All-optical amplify-and-forward relaying system for atmospheric channels

    Kashani, M. A.; Rad, M. M.; Safari, M.; Uysal, Murat (2012)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this letter, we investigate the performance of a dual-hop free space optical link with an all-optical amplify-and-forward relay. We employ photon counting methodology and derive closed form expressions for the end-to-end signal-to-noise ratio and the outage probability. In our derivations, we consider either full or partial channel state information (CSI) at the relay and take ...

    Outage analysis of Hybrid-ARQ protocols in coherent free-space optical communications

    Aghajanzadeh, S. M.; Uysal, Murat (2011)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we investigate the performance of automatic retransmission request (ARQ) protocols in coherent free-space optical (FSO) communications. Specifically, we study the outage performance of three different Hybrid-ARQ (H-ARQ) protocols and characterize their performance at large values of signal-to-noise ratio (SNR) through diversity and coding gains. Our results demonstr...

    Novel adaptive transmission algorithms for free-space optical links

    Karimi, M.; Uysal, Murat (2012)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. Atmospheric turbulence is a major degrading factor in free-space optical (FSO) systems. Since turbulence-induced fading results in a very slowly-varying channel, reliable feedback is possible allowing the implementation of adaptive transmission in practical FSO systems. In this paper, we propose adaptive transmission algorithms in which transmit power and/or modulation size are va...

    Multi-hop relaying over the atmospheric poisson channel: outage analysis and optimization

    Safari, M.; Rad, M. M.; Uysal, Murat (2012)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we study the outage behavior of a decode-and-forward multi-hop free-space optical (FSO) system over a Poisson channel degraded by atmospheric turbulence. We assume that perfect channel side information (CSI) is available at the receiver side and consider both cases of perfect CSI and no CSI at the transmitter side. We solve the outage probability minimization proble...

    Information theoretic analysis of hybrid-ARQ protocols in coherent free-space optical systems

    Aghajanzadeh, S. M.; Uysal, Murat (2012)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. Automatic retransmission request (ARQ) is a feedback-based data link layer technique which enhances the reliability of communication in fading channels. In this paper, we investigate the performance of hybrid-ARQ (H-ARQ) techniques in coherent free-space optical (FSO) communication systems over atmospheric turbulence-induced fading channels. Under the assumption of a Gamma-Gamma s...

    Survey on free space optical communication: a communication theory perspective

    Khalighi, M. A.; Uysal, Murat (2014)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. Optical wireless communication (OWC) refers to transmission in unguided propagation media through the use of optical carriers, i.e., visible, infrared (IR), and ultraviolet (UV) bands. In this survey, we focus on outdoor terrestrial OWC links which operate in near IR band. These are widely referred to as free space optical (FSO) communication in the literature. FSO systems are use...

    Outage performance of MIMO free-space optical systems in gamma-gamma fading channels

    Kazemi, H.; Mostaani, Z.; Uysal, Murat; Ghassemlooy, Z. (2013)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we consider a MIMO Free-Space Optical (FSO) communication system over gamma-gamma turbulence channels and derive a closed-form analytical expression for the outage probability taking into account the effects of both the inner scale size of optical channel and the aperture averaging. Our results demonstrate that by increasing the number of transmit and/or receive ape...

    Capacity analysis of free space optical links for a partially coherent gaussian beam over a turbulent channel with pointing errors

    Lee, I. E.; Ghassemlooy, Z.; Ng, W. P.; Khalighi, M. A.; Uysal, Murat (2013)
    Projects: EC | FOCUS (268318)
    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we investigate the joint effects of beam width and the spatial coherence length in a partially coherent free-space optical (FSO) link from the information theory perspective, taking into account the combined influence of atmospheric turbulence and pointing errors. In addition, the effects of aperture-averaging on the average capacity of FSO links employing partia...

    Outage performance and diversity gain analysis of free-space optical multi-hop parallel relaying

    Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we investigate the outage performance of free-space optical mesh networks, which build upon the combination of serial (multi-hop) and parallel relaying. We assume log-normal atmospheric turbulence channels and derive outage probability expressions for the multi-hop parallel relaying scheme under consideration. Our outage probability analysis demonstrates substantial...
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