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Boluda-Ruiz, Rubén García-Zambrana, Antonio Castillo-Vázquez, Beatriz Castillo-Vázquez, Carmen 2024-09-23T12:34:04Z 2024-09-23T12:34:04Z 2014 Rubén Boluda-Ruiz, Antonio García-Zambrana, Carmen Castillo-Vázquez, and Beatriz Castillo-Vázquez, "Adaptive selective relaying in cooperative free-space optical systems over atmospheric turbulence and misalignment fading channels," Opt. Express 22, 16629-16644 (2014) https://doi.org/10.1364/OE.22.016629 https://hdl.handle.net/10630/32920 https://doi.org/10.1364/OE.22.016629 In this paper, a novel adaptive cooperative protocol with multiple relays using detect-and-forward (DF) over atmospheric turbulence channels with pointing errors is proposed. The adaptive DF cooperative protocol here analyzed is based on the selection of the optical path, source-destination or different source-relay links, with a greater value of fading gain or irradiance, maintaining a high diversity order. Closed-form asymptotic bit error-rate (BER) expressions are obtained for a cooperative free space optical (FSO) communication system with Nr relays, when the irradiance of the transmitted optical beam is susceptible to either a wide range of turbulence conditions, following a gamma-gamma distribution of parameters α and β , or pointing errors, following a misalignment fading model where the effect of beam width, detector size and jitter variance is considered. A greater robustness for different link distances and pointing errors is corroborated by the obtained results if compared with similar cooperative schemes or equivalent multiple-input multiple-output (MIMO) systems. Simulation results are further demonstrated to confirm the accuracy and usefulness of the derived results. eng open access Comunicaciones ópticas Turbulencia atmosférica Adaptive selective relaying in cooperative free-space optical systems over atmospheric turbulence and misalignment fading channels journal article