title: Improved BDF relaying scheme using time diversity over atmospheric turbulence and misalignment fading channels.
abstract: A novel bit-detect-and-forward (BDF) relaying scheme based on repetition coding with the relay is proposed, significantly improving the robustness to impairments proper to free-space optical (FSO) communications such as unsuitable alignment between transmitter and receiver as well as fluctuations in the irradiance of the transmitted optical beam due to the atmospheric turbulence. Closed-form asymptotic bit-error-rate (BER) expressions are derived for a 3-way FSO communication setup. Fully exploiting the potential time-diversity available in the relay turbulent channel, a relevant better performance is achieved, showing a greater robustness to the relay location since a high diversity gain is provided regardless of the source-destination link distance.
authors.affiliation: Department of Communications Engineering, University of Málaga, 29071 Málaga, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: García-Zambrana
authors.affiliation: Department of Statistics and Operations Research, University of Málaga, 29071 Málaga, Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Castillo-Vázquez
authors.affiliation: Department of Communications Engineering, University of Málaga, 29071 Málaga, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Castillo-Vázquez
mesh_terms: D001272:Atmosphere; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000379:methods*