Communications Infrastructure. Systems and Applications in Europe. First International ICST Conference, EuropeComm 2009, London, UK, August 11-13, 2009, Revised Selected Papers

Research Article

MIMO Free-Space Optical Communication Employing Subcarrier Intensity Modulation in Atmospheric Turbulence Channels

Download
464 downloads
  • @INPROCEEDINGS{10.1007/978-3-642-11284-3_7,
        author={Zabih Ghassemlooy and Wasiu Popoola and Vahid Ahmadi and Erich Leitgeb},
        title={MIMO Free-Space Optical Communication Employing Subcarrier Intensity Modulation in Atmospheric Turbulence Channels},
        proceedings={Communications Infrastructure. Systems and Applications in Europe. First International ICST Conference, EuropeComm 2009, London, UK, August 11-13, 2009, Revised Selected Papers},
        proceedings_a={EUROPECOMM},
        year={2012},
        month={5},
        keywords={Atmospheric turbulence BPSK Free-space optics Laser communications MIMO systems Subcarrier modulation Spatial diversity},
        doi={10.1007/978-3-642-11284-3_7}
    }
    
  • Zabih Ghassemlooy
    Wasiu Popoola
    Vahid Ahmadi
    Erich Leitgeb
    Year: 2012
    MIMO Free-Space Optical Communication Employing Subcarrier Intensity Modulation in Atmospheric Turbulence Channels
    EUROPECOMM
    Springer
    DOI: 10.1007/978-3-642-11284-3_7
Zabih Ghassemlooy1,*, Wasiu Popoola1, Vahid Ahmadi2, Erich Leitgeb3
  • 1: Northumbria University
  • 2: Tarbiat Modares University
  • 3: TU
*Contact email: fary.ghassemlooy@unn.ac.uk

Abstract

In this paper, we analyse the error performance of transmitter/receiver array free-space optical (FSO) communication system employing binary phase shift keying (BPSK) subcarrier intensity modulation (SIM) in clear but turbulent atmospheric channel. Subcarrier modulation is employed to eliminate the need for adaptive threshold detector. Direct detection is employed at the receiver and each subcarrier is subsequently demodulated coherently. The effect of irradiance fading is mitigated with an array of lasers and photodetectors. The received signals are linearly combined using the optimal maximum ratio combining (MRC), the equal gain combining (EGC) and the selection combining (SelC). The bit error rate (BER) equations are derived considering additive white Gaussian noise and log normal intensity fluctuations. This work is part of the EU COST actions and EU projects.