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Performance evaluation of receive-diversity free-space optical communications over correlated Gamma-Gamma fading channels

机译：相关Gamma-Gamma衰落信道上接收分集自由空间光通信的性能评估

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摘要

The efficacy of spatial diversity in practical free-space optical communication systems is impaired by the fading correlation among the underlying subchannels. We consider in this paper the generation of correlated Gamma-Gamma random variables in view of evaluating the system outage probability and bit-error-rate under the condition of correlated fading. Considering the case of receive-diversity systems with intensity modulation and direct detection, we propose a set of criteria for setting the correlation coefficients on the small- and large-scale fading components based on scintillation theory. We verify these criteria using wave-optics simulations and further show through Monte Carlo simulations that we can effectively neglect the correlation corresponding to the small-scale turbulence in most practical systems, irrespective of the specific turbulence conditions. This has not been clarified before, to the best of our knowledge. We then present some numerical results to illustrate the effect of fading correlation on the system performance. Our conclusions can be generalized to the cases of multiple-beam and multiple-beam multiple-aperture systems.
机译：底层子信道之间的衰落相关性削弱了实际自由空间光通信系统中空间分集的功效。考虑到在相关衰落条件下评估系统中断概率和误码率，我们考虑在本文中生成相关的Gamma-Gamma随机变量。考虑到具有强度调制和直接检测的接收分集系统的情况，我们提出了一套根据闪烁理论在小规模和大尺度衰落分量上设置相关系数的标准。我们使用波光学仿真验证了这些标准，并通过蒙特卡洛仿真进一步表明，在大多数实际系统中，无论特定的湍流条件如何，我们都可以有效地忽略与小尺度湍流相对应的相关性。就我们所知，这尚未得到澄清。然后，我们提供一些数值结果来说明衰落相关性对系统性能的影响。我们的结论可以推广到多光束和多光束多光圈系统的情况。

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