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In this paper, the authors investigate multi-hop relaying as an efficient fading mitigation tool for coherent Free-Space Optical (FSO) systems over atmospheric turbulence channels. They 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 effects of log-normal turbulence fading and modal compensation, they derive the outage probability and quantify the potential performance improvements through the derivation of Diversity-Multiplexing Tradeoff (DMT) and diversity gain.
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