Coherent vs IM/DD Transmissions for FSO Communications in the Presence of Atmospheric Turbulence
Conference: European Wireless 2023 - 28th European Wireless Conference
10/02/2023 - 10/04/2023 at Rome, Italy
Proceedings: European Wireless 2023
Pages: 6Language: englishTyp: PDF
Authors:
Colavolpe, Giulio; Foggi, Tommaso; Vannucci, Armando (University of Parma, Department of Engineering and Architecture, viale delle Scienze 181/A, Parma, Italy)
Matuz, Balazs; Zahr, Ayman (Institute of Communications and Navigation, German Aerospace Center (DLR), Weßling, Germany)
Abstract:
We investigate the performance of free-space optical communication systems in the presence of atmospheric turbulence with the purpose of assessing the advantages that a coherent communication system can bring with respect to a conventional intensity modulation/direct detection system. The perspective is an information theoretic one, hence we evaluate the mutual information and the corresponding outage probability of both channels, with traditional symbol constellations, as a pragmatic approximation to the capacity, or to the outage capacity, of those channels. In addition, we analyze non-uniform symbol constellations, in order to evaluate the possible shaping gain that can be achieved under different channel conditions.