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Multi-Beam Space-Time Coded Systems for Optical Atmospheric Channels

机译:用于光学大气信道的多光束空时编码系统

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We consider a terrestrial free-space optical communication link affected by atmospheric turbulence. By means of numerical simulations we estimate the reduction in scintillation achieved by the combined effect of aperture averaging and four transmitters when mutually-incoherent sources and a realistic detector size are used. We evaluate two space-time coding schemes: the first scheme uses a repetition code operating on four transmitters, and the second scheme uses a size-four rate-one space-time block code, originally proposed for wireless radio-frequency links. Both schemes deliver large signal-to-noise ratio gains compare to a single-beam system. The first scheme gives the best performance in all cases because of the natural incoherence found among optical sources.
机译:我们考虑受大气湍流影响的地面自由空间光通信链路。通过数值模拟,我们估计了当使用互不相干源和实际检测器尺寸时,通过孔径平均和四个发射器的组合效应所实现的闪烁减少。我们评估了两个空时编码方案:第一个方案使用在四个发射机上运行的重复码,第二个方案使用最初为无线射频链路提出的大小为四的速率一的空时分组码。与单光束系统相比,这两种方案都可提供较大的信噪比增益。第一种方案在所有情况下都可提供最佳性能,这是因为在光源之间发现了自然的不相干性。

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